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X-WR-CALDESC:Events for Instituto de Física Teórica
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DTSTART:20250330T010000
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DTSTART:20251026T010000
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DTSTART:20260329T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260601T150000
DTEND;TZID=Europe/Madrid:20260601T160000
DTSTAMP:20260713T233148
CREATED:20260220T111708Z
LAST-MODIFIED:20260529T082233Z
UID:24424-1780326000-1780329600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Classical Krylov probes and chaotic semiclassical strings'
DESCRIPTION:Title: ‘Classical Krylov probes and chaotic semiclassical strings’ \nSpeaker: Saskia Demulder (CUNEF) \nVenue&Time: Red Room / 15:00 \nAbstract: Quantum chaos is a central theme in string theory\, but classical chaos is also a generic feature of semiclassical string dynamics. Motivated by the need to explore the broad landscape of non-integrable string dynamics\, I will introduce a classical version of Krylov complexity and related diagnostics using the Koopman-von Neumann formulation of classical mechanics. I will then explain how this framework can be applied to integrability-breaking deformations of otherwise integrable semiclassical string solutions. In particular\, I will show how such deformations induce characteristic redistributions of spectral weight\, leading to observable-dependent delocalisation and spreading in Koopman-Krylov space. This talk is based on [2602.23421] and ongoing work\, both in collaboration with Rathindra N. Das.
URL:https://www.ift.uam-csic.es/event/seminar-by-saskia-demulder-cunef/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260602T113000
DTEND;TZID=Europe/Madrid:20260602T130000
DTSTAMP:20260713T233148
CREATED:20260527T130818Z
LAST-MODIFIED:20260527T130956Z
UID:25101-1780399800-1780405200@www.ift.uam-csic.es
SUMMARY:Holo-Club: From Volume as a Clock to Boundary Dynamics in JT Gravity
DESCRIPTION:Title: From Volume as a Clock to Boundary Dynamics in JT Gravity \nSpeaker: Farbod-Sayyed Rassouli (University of Nottingham) \nVenue&Time: 11:30 / Blue Room \nAbstract: \nDifferent notions of time arise from different choices of observer. In cosmological settings\, a particularly natural choice is the spacetime volume\, which is conjugate to the cosmological constant. This leads to a notion of unimodular time that deparametrizes the Wheeler–DeWitt equation into a Schrödinger-like evolution equation\, while also inducing a natural time variable at the boundary. In this talk\, I will first explain how this construction arises in arbitrary dimension\, with particular emphasis on the 4D case. I will then turn to Jackiw–Teitelboim gravity\, where promoting the vacuum cosmological constant to a dynamical top-form degree of freedom provides a bulk clock in the Henneaux–Teitelboim sense. On the boundary\, this modifies the usual Schwarzian dynamics by coupling it to an additional U(1) phase mode\, reproducing the universal low-energy structure familiar from complex SYK. I will show how the corresponding boundary theory can itself be rewritten as a (0+1)-dimensional observer action\, making explicit the relation between the bulk volume clock and its holographic boundary counterpart. \narXiv:2601.07911
URL:https://www.ift.uam-csic.es/event/holo-club-from-volume-as-a-clock-to-boundary-dynamics-in-jt-gravity/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260602T140000
DTEND;TZID=Europe/Madrid:20260602T150000
DTSTAMP:20260713T233148
CREATED:20260406T092426Z
LAST-MODIFIED:20260406T092426Z
UID:24831-1780408800-1780412400@www.ift.uam-csic.es
SUMMARY:Cosmology Journal Club
DESCRIPTION:Every Tuesday at 2:00 PM in the discussion room on the 5th floor. \nJoin the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-28/
LOCATION:Discussion room 5th floor\, C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260602T150000
DTEND;TZID=Europe/Madrid:20260602T160000
DTSTAMP:20260713T233148
CREATED:20260527T141356Z
LAST-MODIFIED:20260603T093853Z
UID:25107-1780412400-1780416000@www.ift.uam-csic.es
SUMMARY:A diffuse flux of MeV ALPs
DESCRIPTION:Title: ‘A diffuse flux of MeV ALPs’ \nSpeaker: Marina Cermeño \nVenue&Time: Red Room / 15:00 \nAbstract: MeV scale axion-like particles can be produced with semi-relativistic velocities in Galactic supernovae\, leading to a diffuse flux that can be detectable in neutrino water-Cherenkov detectors (Super + HyperK). In this talk\, I will explain the details of the calculation that we recently did in 2602.17597 also with some content from our previous works 2412.09595 \, 2412.19890) \n 
URL:https://www.ift.uam-csic.es/event/a-diffuse-flux-of-mev-alps/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260603T113000
DTEND;TZID=Europe/Madrid:20260603T123000
DTSTAMP:20260713T233148
CREATED:20260529T082527Z
LAST-MODIFIED:20260602T141630Z
UID:25123-1780486200-1780489800@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Polynomial-time thermalization and Gibbs sampling from system-bath couplings'
DESCRIPTION:Title: ‘Polynomial-time thermalization and Gibbs sampling from system-bath couplings’\n\nSpeaker: Sam Slezak (ENS Lyon)\n\nVenue&Time: Gray Room 3 / 11:30\n\nAbstract: Many physical phenomena\, including thermalization in open quantum systems and quantum Gibbs sampling\, are modeled by Lindbladians approximating a system weakly coupled to a bath. Understanding the convergence speed of these Lindbladians to their steady states is crucial for bounding algorithmic runtimes and thermalization timescales. We study two such families of processes: one characterizing a repeated-interaction Gibbs sampling algorithm\, and another modeling open many-body quantum thermalization. We prove that both converge in polynomial time for several non-commuting systems\, including high-temperature local lattices\, weakly interacting fermions\, and 1D spin chains. These results demonstrate that simple dissipative quantum algorithms can prepare complex Gibbs states and that Lindblad dynamics accurately capture thermal relaxation. Our proofs rely on a novel technical result that extrapolates spectral gap lower bounds from quasi-local Lindbladians to the non-local generators governing these dynamics.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-polynomial-time-thermalization-and-gibbs-sampling-from-system-bath-couplings/
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260603T150000
DTEND;TZID=Europe/Madrid:20260603T163000
DTSTAMP:20260713T233148
CREATED:20260220T111829Z
LAST-MODIFIED:20260602T141751Z
UID:24426-1780498800-1780504200@www.ift.uam-csic.es
SUMMARY:IFT Colloquium: Matthew Headrick (Brandeis & IHES)
DESCRIPTION:Venue&Time: Blue Room / 15:00 \nCoffee will be served in the cafeteria at 16:15h \nTitle: ‘Black holes\, quantum entanglement\, and the geometry of spacetime’ \nSpeaker: Matthew Headrick (Brandeis & IHES) \nAbstract: Black holes are by far the most entropic objects in the universe\, and their enormous entropy directly connects the macroscopic world governed by general relativity to the Planck scale governed by quantum gravity. It turns out that they are just a piece of a much larger and richer story\, hinting that\, despite the notorious difficulty of quantizing gravity\, quantum mechanics and general relativity are actually two sides of the same coin. I’ll explain these connections\, and along the way try to answer the question: Is Newton’s constant really equal to 1?
URL:https://www.ift.uam-csic.es/event/colloquium-matthew-headrick-brandeis-ihes/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Colloquia,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260604T120000
DTEND;TZID=Europe/Madrid:20260604T130000
DTSTAMP:20260713T233148
CREATED:20260529T081413Z
LAST-MODIFIED:20260529T081413Z
UID:25114-1780574400-1780578000@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Sharpened Dynamical Cobordism'
DESCRIPTION:Strings\, Pheno and the Swampland (SPS) Journal Club \n\n\nTitle: Sharpened Dynamical Cobordism\n\nSpeaker: Alejandro Javier Puga Gómez (IFT) \n\nVenue&Time: Red Room / 12:00\n \nAbstract: We propose a sharpened version of Dynamical Cobordism\, where the physical structure ξ of the theory in question determines an allowed range Rξ for the critical exponent δ. We interpret a singularity with δ∈Rξ as a true transition-to-nothing\, i.e.\, a configuration ending spacetime\, while a singularity with δ∉Rξ indicates some obstruction to such a transition\, i.e.\, the presence of a non-trivial cobordism global charge\, which is incompatible with a theory of quantum gravity. In the spirit of the original Cobordism Conjecture\, this apparent inconsistency of the theory can be alleviated via the modification of the structure\, for instance by introducing new degrees of freedom and associated defects. Inspired by the Gubser criterion for good singularities\, we propose a way to determine Rξ. As a proof-of-concept we show explicitly how the introduction of a higher-form gauge field changes the allowed range of δ compared to an EFT with only scalars. We test this sharpened version of Dynamical Cobordism against several examples\, such as massive IIA string theory\, where it is notably compatible with the presence of O8-planes; the Janis-Newman-Winicour and Garfinkle-Horowitz-Strominger black hole solutions; and certain singular distributions of D-branes. In all these cases\, the Sharpened Dynamical Cobordism Conjecture leads to results consistent with our expectations.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-sharpened-dynamical-cobordism/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260604T120000
DTEND;TZID=Europe/Madrid:20260604T130000
DTSTAMP:20260713T233148
CREATED:20260529T081532Z
LAST-MODIFIED:20260529T081532Z
UID:25116-1780574400-1780578000@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club
DESCRIPTION:Every Thursday at 12:00 in Grey Room 2.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-16/
LOCATION:Grey Room 2\, Instituto de Física Teórica\, Madrid\, Madrid\, 28037\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260604T170000
DTEND;TZID=Europe/Madrid:20260604T180000
DTSTAMP:20260713T233148
CREATED:20260601T180607Z
LAST-MODIFIED:20260601T180607Z
UID:25133-1780592400-1780596000@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Cosmological Lower Bound on Heavy-Neutrino Masses'
DESCRIPTION:Valeria Costa (IFT) will present: Cosmological Lower Bound on Heavy-Neutrino Masses\, de B. W. Lee y S. Weinberg. \nVenue&Time: Blue Room / 17:00 \nAbstract: \nThe present cosmic mass density of possible-stable neutral heavy leptons is calculated in a standard cosmological model. In order for this density not to exceed the upper limit of 2*10^-29 g/cm^3\, the lepton mass would have to be greater than a lower bound of the order of 2 GeV.
URL:https://www.ift.uam-csic.es/event/old-journal-club-cosmological-lower-bound-on-heavy-neutrino-masses/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260605T113000
DTEND;TZID=Europe/Madrid:20260605T123000
DTSTAMP:20260713T233148
CREATED:20260601T112441Z
LAST-MODIFIED:20260601T112441Z
UID:25131-1780659000-1780662600@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Onset of Ergodicity Across Scales on a Digital Quantum Processor'
DESCRIPTION:Title: ‘Onset of Ergodicity Across Scales on a Digital Quantum Processor’\n\nSpeaker: Marcos Crichigno (Phasecraft)\n\nVenue & Time: Gray Room 3 / 11:30\n\nAbstract: Boltzmann’s ergodic hypothesis lies at the foundation of classical statistical mechanics\, yet its quantum counterpart remains far less understood. In this talk\, I will discuss a quantum-information-theoretic measure of quantum ergodicity that probes its emergence at different resolution scales\, revealing otherwise inaccessible global aspects of the quantum many-body wavefunction. We apply this metric to chart the boundary between ergodic and non-ergodic behavior in a two-dimensional disordered Floquet-Heisenberg system\, using large-scale simulations\, both classical and quantum on IBM’s latest digital quantum processor with up to 10×10 qubits
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-onset-of-ergodicity-across-scales-on-a-digital-quantum-processor/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260608T113000
DTEND;TZID=Europe/Madrid:20260608T123000
DTSTAMP:20260713T233148
CREATED:20260608T063731Z
LAST-MODIFIED:20260608T064238Z
UID:25169-1780918200-1780921800@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Exponential quantum advantage in processing massive classical data'
DESCRIPTION:Title: ‘Exponential quantum advantage in processing massive classical data’\n\nVenue/Time: 11:30 / Gray Room 1\n\nSpeaker:  Isabel María Moreno Cuadrado (ICMAT) will present ‘Exponential quantum advantage in processing massive classical data’ by Hsin-Yuan Huang et al.\n\nAbstract: Broadly applicable quantum advantage\, particularly in classical data processing and machine learning\, has been a fundamental open problem. In this work\, we prove that a small quantum computer of polylogarithmic size can perform large-scale classification and dimension reduction on massive classical data by processing samples on the fly\, whereas any classical machine achieving the same prediction performance requires exponentially larger size. Furthermore\, classical machines that are exponentially larger yet below the required size need superpolynomially more samples and time. We validate these quantum advantages in real-world applications\, including single-cell RNA sequencing and movie review sentiment analysis\, demonstrating four to six orders of magnitude reduction in size with fewer than 60 logical qubits. These quantum advantages are enabled by quantum oracle sketching\, an algorithm for accessing the classical world in quantum superposition using only random classical data samples. Combined with classical shadows\, our algorithm circumvents the data loading and readout bottleneck to construct succinct classical models from massive classical data\, a task provably impossible for any classical machine that is not exponentially larger than the quantum machine. These quantum advantages persist even when classical machines are granted unlimited time or if BPP=BQP\, and rely only on the correctness of quantum mechanics. Together\, our results establish machine learning on classical data as a broad and natural domain of quantum advantage and a fundamental test of quantum mechanics at the complexity frontier.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-exponential-quantum-advantage-in-processing-massive-classical-data/
LOCATION:Gray Room 1\, Instituto de Física Teórica\, C/ Nicolás Cabrera 13-15\, Cantoblanco\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260609T113000
DTEND;TZID=Europe/Madrid:20260609T133000
DTSTAMP:20260713T233148
CREATED:20260527T131127Z
LAST-MODIFIED:20260604T123628Z
UID:25104-1781004600-1781011800@www.ift.uam-csic.es
SUMMARY:Holo-Club: 'Boundary entropy and entanglement phase transitions in  holographic ICFTs'
DESCRIPTION:Title: Boundary entropy and entanglement phase transitions in\nholographic ICFTs \nSpeaker: Evangelos Afxonidis (University of Oviedo) \nVenue&Time: 11:30 / Gray Room 3 \nAbstract: In 1+1 dimensional conformal field theory with a boundary\, the boundary contribution to the entanglement entropy is encoded in a single number g\, effectively counting the boundary degrees of freedom. In contrast\, for interface CFTs the corresponding quantity is a non-trivial function depending on the position of the interval relative to the interface\, giving access to much more detailed information about the defect. In this talk\, I will present several holographic examples illustrating the structure of this g-function and discuss the limit in which the entangling interval approaches the interface\, relating it to the effective central charge. I will conclude with a discussion of entanglement phase transitions associated to bipartite entanglement in a variety of holographic interfaces.
URL:https://www.ift.uam-csic.es/event/holo-club-title-boundary-entropy-and-entanglement-phase-transitions-in-holographic-icfts/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260609T140000
DTEND;TZID=Europe/Madrid:20260609T150000
DTSTAMP:20260713T233148
CREATED:20260406T092501Z
LAST-MODIFIED:20260406T092501Z
UID:24832-1781013600-1781017200@www.ift.uam-csic.es
SUMMARY:Cosmology Journal Club
DESCRIPTION:Every Tuesday at 2:00 PM in the discussion room on the 5th floor. \nJoin the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-29/
LOCATION:Discussion room 5th floor\, C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260611T120000
DTEND;TZID=Europe/Madrid:20260611T130000
DTSTAMP:20260713T233148
CREATED:20260603T095641Z
LAST-MODIFIED:20260608T101212Z
UID:25149-1781179200-1781182800@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club: 'Bubble Nucleation from Boson Star Collapse'
DESCRIPTION:Title: Bubble Nucleation from Boson Star Collapse\n\nSpeaker: Kateryna Radchenko Serdula (IFT) will present “Bubble Nucleation from Boson Star Collapse”\, 2511.21826\n\nVenue&Time: Gray Room 2 / 12:00\n\nAbstract: We present a new classical mechanism for nucleation of bubbles of true vacuum. The mechanism arises when dense boson stars form in the false vacuum. As the boson stars collapse due to attractive self-interactions\, the field inside the star cores is enhanced beyond the potential barrier. Subsequently the stars explode as true vacuum bubbles and induce a cosmological phase transition. The mechanism raises the possibility that a vacuum that is stable against quantum tunneling can be vulnerable to “astrophysical” processes.\n 
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-17/
LOCATION:Grey Room 2\, Instituto de Física Teórica\, Madrid\, Madrid\, 28037\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260611T150000
DTEND;TZID=Europe/Madrid:20260611T160000
DTSTAMP:20260713T233148
CREATED:20260310T095036Z
LAST-MODIFIED:20260603T094247Z
UID:24580-1781190000-1781193600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Revisiting Critical Higgs Inflation: CMB Observables\, Electroweak Couplings\, and Perturbative Unitarity'
DESCRIPTION:Title: Revisiting Critical Higgs Inflation: CMB Observables\, Electroweak Couplings\, and Perturbative Unitarity\n \nSpeaker: Sarah R. Geller (Yale U.) \nVenue & Time: Red Room / 15:00\n\n\n\nAbstract:\nAn intriguing and economical possibility to explain many cosmological observations is Higgs inflation\, in which inflation is driven by the Standard Model Higgs with a non-minimal coupling to gravity. I will discuss near-critical Higgs inflation at two loops and show that\, for any set of parameters derived from SM couplings at the electroweak scale and run to the inflationary scale\, one can find a value of the non-minimal coupling that brings the model into compliance with all measured CMB observables. Unlike standard Higgs inflation\, which typically requires unnaturally large values of the non-minimal coupling\, I will demonstrate that in metric gravity we can match the CMB while staying within 3σ of electroweak precision data with non-minimal couplings on the order of 50–200. The success of the model\, however\, comes at the cost of self-consistency when it is treated as an effective description of electroweak-scale physics; that is\, the model becomes unavoidably sensitive to physics beyond the SM in the UV\, undermining the simplicity that originally motivated Higgs inflation.
URL:https://www.ift.uam-csic.es/event/seminar-by-sarah-r-geller-tbc/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260618T120000
DTEND;TZID=Europe/Madrid:20260618T130000
DTSTAMP:20260713T233148
CREATED:20260603T095532Z
LAST-MODIFIED:20260604T123328Z
UID:25147-1781784000-1781787600@www.ift.uam-csic.es
SUMMARY:Strings\, Pheno and the Swampland (SPS) Journal Club
DESCRIPTION:Every Thursday at 12:00 in the Red Room.
URL:https://www.ift.uam-csic.es/event/strings-pheno-and-the-swampland-sps-journal-club-4/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260618T170000
DTEND;TZID=Europe/Madrid:20260618T180000
DTSTAMP:20260713T233148
CREATED:20260603T094731Z
LAST-MODIFIED:20260604T124507Z
UID:25140-1781802000-1781805600@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Large scale perturbations in the open universe'
DESCRIPTION:Mikel Martin (IFT) will present “Large scale perturbations in the open universe”\, by  D. H.  Lyth\, &  A. Woszczyna\, \nVenue&Time: Blue Room / 17:00 \nAbstract:\nWhen considering perturbations in an open (Omega<1) universe\, cosmologists retain only sub-curvature modes (defined as eigenfunctions of the Laplacian whose eigenvalue is less than -1 in units of the curvature scale\, in contrast with the super-curvature modes whose eigenvalue is between -1 and 0). Mathematicians have known for almost half a century that all modes must be included to generate the most general HOMOGENEOUS GAUSSIAN RANDOM FIELD\, despite the fact that any square integrable FUNCTION can be generated using only the sub-curvature modes. The former mathematical object\, not the latter\, is the relevant one for physical applications. The mathematics is here explained in a language accessible to physicists. Then it is pointed out that if the perturbations originate as a vacuum fluctuation of a scalar field there will be no super-curvature modes in nature. Finally the effect on the cmb of any super-curvature contribution is considered\, which generalizes to Omega<1 the analysis given by Grishchuk and Zeldovich in 1978. A formula is given\, which is used to estimate the effect. In contrast with the case Omega=1\, the effect contributes to all multipoles\, not just to the quadrupole. It is important to find out whether it has the same l dependence as the data\, by evaluating the formula numerically.
URL:https://www.ift.uam-csic.es/event/old-journal-club/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260623T150000
DTEND;TZID=Europe/Madrid:20260623T160000
DTSTAMP:20260713T233148
CREATED:20260622T083902Z
LAST-MODIFIED:20260623T123818Z
UID:25286-1782226800-1782230400@www.ift.uam-csic.es
SUMMARY:Seminar: 'A hot take on electroweak skyrmions'
DESCRIPTION:Title: ‘A hot take on electroweak skyrmions’ \nSpeaker: Luis Gil (Universidad de Granada). \nVenue&Time: Red Room / 15:00 \nAbstract: Skyrmions are stable and topologically non-trivial field configurations that behave like localized particles. They appear in the chiral  effective theory for pions\, where they correspond to the baryon states\, and might also exist in the electroweak theory\, in the presence of certain effective interactions.\nIn this talk\, focusing on toy models that capture different limits of the electroweak sector of the Standard Model (SM)\, we will how skyrmions not classically stable at zero temperature can be stabilized by thermal effects. This motivates the study of skyrmions in the quantum effective action of the SM\, where they might constitute a dark matter candidate without new physics.
URL:https://www.ift.uam-csic.es/event/seminar-a-hot-take-on-electroweak-skyrmions/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260624T113000
DTEND;TZID=Europe/Madrid:20260624T123000
DTSTAMP:20260713T233148
CREATED:20260618T075243Z
LAST-MODIFIED:20260618T075640Z
UID:25269-1782300600-1782304200@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Efficient Characterisation of Quantum Information Processors'
DESCRIPTION:Speaker: Pablo Viñas Martínez (IFT) \nTítle: ‘Efficient Characterisation of Quantum Information Processors’ \nVenue&Time: Gray Room 1 / 11:30 \nAbstract: “The precise characterisation and benchmarking of quantum information processors (QIPs) is essential for the development of quantum technologies. From the engineering of low-error physical components to the design of physically informed decoding strategies in quantum error correction (QEC)\, a detailed understanding of noise plays a central role. However\, achieving an appropriate balance between the amount of information extracted and the experimental overhead required by characterisation protocols remains a significant challenge. In this talk\, I will explore several approaches aimed at addressing this trade-off. First\, I will discuss how the incorporation of physically motivated models can substantially reduce the resource requirements of quantum tomography protocols (https://arxiv.org/abs/2407.11539\, https://arxiv.org/abs/2507.02542). Second\, I will consider the problem from a complementary perspective: rather than focusing on the characterisation of fully general QIPs\, I will examine protocols tailored to the characterisation of QEC circuits.”
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-efficient-characterisation-of-quantum-information-processors/
LOCATION:Gray Room 1\, Instituto de Física Teórica\, C/ Nicolás Cabrera 13-15\, Cantoblanco\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260625T113000
DTEND;TZID=Europe/Madrid:20260625T123000
DTSTAMP:20260713T233148
CREATED:20260618T075447Z
LAST-MODIFIED:20260618T075624Z
UID:25271-1782387000-1782390600@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Some Properties of Local One-Dimensional Hamiltonians'
DESCRIPTION:Speaker: José Garre Rubio \nTítle: ‘Some Properties of Local One-Dimensional Hamiltonians’ \nVenue&Time: Gray Room 1 / 11:30 \nAbstract: In this talk\, I will discuss several properties of local Hamiltonians associated with the W state and matrix product states (MPS). I will begin by showing that the W state cannot be the unique ground state of any local Hamiltonian. I will then present a condition that guarantees that the parent Hamiltonian of an arbitrary MPS is well behaved\, encompassing the W-state case as an example. Finally\, I will characterize the action of local Hamiltonians on injective MPS\, an important class that describes unique ground states. Throughout the talk\, I will highlight several open problems and possible directions for future research. The results presented are based on [JGR\, Quantum Information Processing 24\, 366 (2025)]\, [JGR\, A. Turzillo\, A. Molnár\, Annales Henri Poincaré 1–23 (2025)]\, and [JGR\, A. Molnár\, N. Schuch\, F. Verstraete\, arXiv:2603.28349].
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-some-properties-of-local-one-dimensional-hamiltonians/
LOCATION:Gray Room 1\, Instituto de Física Teórica\, C/ Nicolás Cabrera 13-15\, Cantoblanco\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260625T113000
DTEND;TZID=Europe/Madrid:20260625T123000
DTSTAMP:20260713T233148
CREATED:20260618T153939Z
LAST-MODIFIED:20260618T153939Z
UID:25281-1782387000-1782390600@www.ift.uam-csic.es
SUMMARY:Strings\, Pheno and the Swampland (SPS) Journal Club
DESCRIPTION:Speaker: Alberto Castellano (Chicago U.) \nVenue&Time: Red Room / 11:30
URL:https://www.ift.uam-csic.es/event/strings-pheno-and-the-swampland-sps-journal-club-5/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260625T150000
DTEND;TZID=Europe/Madrid:20260625T160000
DTSTAMP:20260713T233148
CREATED:20260525T062834Z
LAST-MODIFIED:20260618T153338Z
UID:25093-1782399600-1782403200@www.ift.uam-csic.es
SUMMARY:Seminar: 'Differential observables for the Higgs-strahlung process to all orders in EFT'
DESCRIPTION:Title: ‘Differential observables for the Higgs-strahlung process to all orders in EFT.’ \nSpeaker: Sourav Bera from Tata Institute of Fundamental Research (TIFR) \nVenue&Time: Red Room / 15:00 \nAbstract: We develop methods to obtain the fully differential cross-section for the  f f \to Z(ll) h  process to any desired order in  effective field theory (EFT). To achieve this\, we first derive a mapping between the partial wave expansion and the EFT expansion  to all orders. We find that at lower orders\,  EFT predicts correlations between the different partial wave coefficients. This allows us to construct linear combinations of partial wave coefficients that get their leading contributions from a higher dimension EFT operator. We then introduce experimental observables\, the so called angular moments — that   probe these  linear combinations of partial wave coefficients — and can be determined from a fully differential analysis of the angular distribution of the leptons arising from the Z – decay. We show that  analysing the dependence of these angular moments on the Zh invariant mass allows us to systematically probe all higher dimension EFT operators contributing to this process. In particular\, we discuss how our results can be used to probe dimension-8 operators  in the Standard Model EFT (SMEFT). While we take  the Higgs-strahlung process as an example\, the methods developed here are completely general and can also be applied to other 2-to-2 collider processes.
URL:https://www.ift.uam-csic.es/event/seminar-by-sourav-bera/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260702T150000
DTEND;TZID=Europe/Madrid:20260702T160000
DTSTAMP:20260713T233148
CREATED:20260603T095357Z
LAST-MODIFIED:20260629T103529Z
UID:25145-1783004400-1783008000@www.ift.uam-csic.es
SUMMARY:Seminar: 'NLO Running in the SMEFT'
DESCRIPTION:Title: ‘NLO Running in the SMEFT’ \nSpeaker: Lukas Born (University of Bern). \nVenue&Time: Red Room / 15:00 \nAbstract: The Standard Model Effective Field Theory (SMEFT) provides a systematic framework for parameterizing heavy new physics in a model-independent way. A central ingredient for precision analyses within this framework is the renormalization group equations (RGEs)\, governing the running of the Wilson coefficients across energy scales. Our recent computation of the two-loop β-functions in the SMEFT marks a milestone in this program\, opening the door to genuine next-to-leading order (NLO) analyses. \nIn this talk\, I will first discuss the key technical challenges we encountered in our calculation\, how we addressed them by modifying the Warsaw basis\, and the consistency checks on our results. Second\, I will turn to a concrete phenomenological application\, demonstrating that NLO running effects play an important role in Electroweak Precision Observables (EWPO).
URL:https://www.ift.uam-csic.es/event/seminar-by-lukas-born/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260707T150000
DTEND;TZID=Europe/Madrid:20260707T170000
DTSTAMP:20260713T233148
CREATED:20260624T084812Z
LAST-MODIFIED:20260702T111259Z
UID:25291-1783436400-1783443600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Sub-GeV Dark Matter\, Neutrino Masses\, and Astrophysical Signals from a Rich Dark Sector'
DESCRIPTION:Title: ‘Sub-GeV Dark Matter\, Neutrino Masses\, and Astrophysical Signals from a Rich Dark Sector.’ \nSpeaker: Elina Merkel (University of Bologna) \nVenue&Time: Red Room / 15:00 \nAbstract: Rich dark sectors provide an attractive framework for addressing several puzzles in particle physics and cosmology within a single model. In this talk\, I will present a simple sub-GeV dark-sector realization featuring a dark matter candidate\, a light scalar mediator\, and an extended neutrino sector. I will show how the model can reproduce the observed relic abundance\, generate light neutrino masses\, and satisfy cosmological constraints. I will then discuss its phenomenological implications\, focusing on neutrino signals that could be probed by current and future neutrino telescopes.
URL:https://www.ift.uam-csic.es/event/seminar-sub-gev-dark-matter-neutrino-masses-and-astrophysical-signals-from-a-rich-dark-sector/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260709T150000
DTEND;TZID=Europe/Madrid:20260709T160000
DTSTAMP:20260713T233148
CREATED:20260525T063643Z
LAST-MODIFIED:20260702T081635Z
UID:25095-1783609200-1783612800@www.ift.uam-csic.es
SUMMARY:Seminar: ‘The Hunt for Multiple Axions’
DESCRIPTION:Title: ‘The Hunt for Multiple Axions’ \nSpeaker: Arturo de Giorgi (University of Durham). \nVenue&Time: Red Room / 15:00 \nAbstract: Axions and axion-like particles may arise in Nature as a spectrum rather than as a single field. Such a scenario naturally emerges in string-inspired constructions\, as well as in reasonably simple bottom-up extensions of single axion models. In such multi-axion scenarios\, new signal features arise\, and recasting of existing experimental bounds from single-axion constraints becomes generally non-trivial. This motivates a closer look at how laboratory axion searches are impacted when multiple states contribute. In this talk\, I will first briefly introduce bulk axions in extra dimensions as a concrete framework that naturally generates multiple modes\, and highlight some of the phenomenological subtleties that follow. I will then present general results for multi-axions–photon oscillations\, showing how coherence and interference can either enhance or suppress signals\,  with direct implications for light-shining-through-a-wall experiments and beyond.
URL:https://www.ift.uam-csic.es/event/seminar-by-arturo-de-giorgi/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260914T150000
DTEND;TZID=Europe/Madrid:20260914T160000
DTSTAMP:20260713T233148
CREATED:20260617T110657Z
LAST-MODIFIED:20260617T110657Z
UID:25210-1789398000-1789401600@www.ift.uam-csic.es
SUMMARY:Seminar by Damir Becirevic
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/seminar-by-damir-becirevic/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261015T150000
DTEND;TZID=Europe/Madrid:20261015T160000
DTSTAMP:20260713T233148
CREATED:20260617T105750Z
LAST-MODIFIED:20260617T105750Z
UID:25206-1792076400-1792080000@www.ift.uam-csic.es
SUMMARY:IFT Colloquium by Mark Srednicki (UC Santa Barbara)
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/ift-colloquium-by-mark-srednicki-uc-santa-barbara/
CATEGORIES:Colloquia,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261019T150000
DTEND;TZID=Europe/Madrid:20261019T160000
DTSTAMP:20260713T233148
CREATED:20260617T110552Z
LAST-MODIFIED:20260617T110552Z
UID:25208-1792422000-1792425600@www.ift.uam-csic.es
SUMMARY:Seminar by Mark Srednicki
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/seminar-by-mark-srednicki/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
END:VCALENDAR