BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Instituto de Física Teórica - ECPv6.15.11//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Instituto de Física Teórica
X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Madrid
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20270328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20271031T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260918T110000
DTEND;TZID=Europe/Madrid:20260918T133000
DTSTAMP:20260911T004351
CREATED:20260908T110406Z
LAST-MODIFIED:20260908T110406Z
UID:25536-1789729200-1789738200@www.ift.uam-csic.es
SUMMARY:PhD Defense by David Alonso-González: Into The Dark: Novel and Complementary Searches in Hidden Sectors
DESCRIPTION:Title: Into The Dark: Novel and Complementary Searches in Hidden Sectors\n\nVenue & Time: Blue Room / 11:00-13:30\n\nAbstract: This thesis explores weakly coupled extensions of the Standard Model\, focusing on hidden sectors that may evade conventional experimental searches while addressing some of the main open questions in particle physics\, such as the nature of dark matter and the origin of neutrino masses. The work is organized around three complementary case studies involving a thermal dark matter candidate connected to the Standard Model through a vector portal\, axionlike particles produced in core-collapse supernovae and their possible detection at terrestrial neutrino experiments\, and the interplay between dark matter direct detection experiments and spallation source facilities to constrain the properties of sterile neutrinos. These three works emphasize the importance of combining different experimental strategies to constrain or reconstruct new weakly coupled physics scenarios.
URL:https://www.ift.uam-csic.es/event/phd-defense-by-david-alonso-gonzalez-into-the-dark-novel-and-complementary-searches-in-hidden-sectors/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260921T110000
DTEND;TZID=Europe/Madrid:20260921T133000
DTSTAMP:20260911T004351
CREATED:20260908T111916Z
LAST-MODIFIED:20260908T111916Z
UID:25541-1789988400-1789997400@www.ift.uam-csic.es
SUMMARY:PhD Defense by Indira Ocampo Justiniano: A machine learning approach for unraveling the nature of dark matter and dark energy
DESCRIPTION:Title: A machine learning approach for unraveling the nature of dark matter and dark energy\n\nVenue & Time: Red Room / 11:00-13:30\n\nAbstract: Cosmology nowadays is benefiting from an exponential increase of data\, transforming into a precision science. This will help us understand better two of the most important open issues in theoretical physics\, namely understanding the nature of dark matter (DM) and dark energy (DE). \nHowever\, the vast quantity and quality of the data collected from present and upcoming cosmological surveys has become so demanding that sophisticated computational tools are required. As a result\, machine learning (ML) methods are being implemented for data analysis and model constraints\, with the hope of alleviating tensions in the parameters inferred from different cosmological probes. \nA significant challenge remains in the complexity of these models: as architectures become more accurate\, this usually comes with the trade-off of their interpretability. This can lead to a lack of transparency and trustworthiness in a field that demands validation based on physical laws rather than artifacts arising during training. \nThe research presented in this thesis focuses on different ML architectures based on neural networks (NNs) to search for signatures of physics beyond ΛCDM. In Chapter 4\, we train a convolutional neural network on the Quijote N-body simulations to perform parameter inference of fσ8. \nIn Chapter 5\, we discuss the results of testing a type of Coupled Dark Energy model against ΛCDM\, by training an NN to discriminate the simulated fσ8 data. We extended this approach in Chapter 6\, by testing another alternative to ΛCDM\, the f(R) Hu-Sawicki model\, while this time we applied LIME (Local Interpretable Model-agnostic Explanations) after the NN was trained. LIME serves as an interpretability framework that assigns importance scores to input data\, identifying the features most relevant to the model’s decision-making. For both Chapter 5 and Chapter 6\, data simulations were tailored to the DESI survey specifications. \nIn Chapter 7\, we applied a similar pipeline trained on Cosmic Microwave Background simulated temperature and polarisation power spectra. For this project\, we targeted the Planck mission\, simulating data coming from ΛCDM\, f(R) and a non-standard oscillating feature in the primordial power spectrum. To explain individual model predictions\, we implement SHAP (SHapley Additive exPlanations). \nIn Chapter 8\, we extend this analysis by performing the training and interpretability analysis directly on the CMB maps\, integrated into my publicly available package SkyExplain¹. \nFinally\, in the Conclusions and future challenges\, I draw the main conclusions and discuss future work.
URL:https://www.ift.uam-csic.es/event/phd-defense-by-indira-ocampo-justiniano-a-machine-learning-approach-for-unraveling-the-nature-of-dark-matter-and-dark-energy/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260921T150000
DTEND;TZID=Europe/Madrid:20260921T170000
DTSTAMP:20260911T004351
CREATED:20260821T101946Z
LAST-MODIFIED:20260821T102628Z
UID:25494-1790002800-1790010000@www.ift.uam-csic.es
SUMMARY:Seminar Georg Weiglein (DESY)
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/seminar-georg-weiglein-desy/
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:20260930T111500
DTEND;TZID=Europe/Madrid:20260930T160000
DTSTAMP:20260911T004351
CREATED:20260910T105732Z
LAST-MODIFIED:20260910T105732Z
UID:25553-1790766900-1790784000@www.ift.uam-csic.es
SUMMARY:Polygonal Gravity Seminars
DESCRIPTION:Madrid’s Polygonal Gravity Seminar Series\nWednesday\, September 30th. Red Room (IFT)\n  \n11:15h Welcome coffee \n————————- \n11:30h First talk \nSpeaker: Sameer Murthy (Kingś College\, London) \nTitle: Near-extremal black holes in GR and in string theory \nAbstract:What happens to the thermodynamics of a black hole at very low temperatures as it\napproaches extremality? This question had remained a puzzle for many decades. Recent progress shows\nthat semi-classical physics in the near-extremal limit needs to be revisited due to the appearance\nof nearly gapless modes in the near-horizon of a near-extremal black hole. Upon approaching the\nextremal limit carefully\, one finds that the quantum fluctuations of these gapless modes leads to\nunexpectedly large effects even for a very massive black holes with weakly-curved horizons. In the\nfirst part of this talk\, I will explain this progress and discuss various applications. \nIn the second half of the talk\, I will discuss progress regarding the calculation of entropy of\nsupersymmetric black holes\, which has been one of the big successes of string theory. I will discuss\nhow the counting of entropy in string theory involves a subtlety regarding the supersymmetric index\,\nand how its resolution also involves\, once again\, taking the extremal limit carefully. Finally\, I\nwill discuss how this procedure leads to a new class of supersymmetric solutions corresponding to\nblack holes and black strings. \n————————- \n12:45-14:45 Lunch break and free time \n————————- \n15:00h Second talk \nSpeaker: Luciano Rezzolla (Institute of Theoretical Physics\, Goethe U.\, Frankfurt) \nTitle: Binary Neutron Stars: from macroscopic collisions to microphysics  \nAbstract: I will argue that if black holes represent one the most fascinating implications of\nEinstein’s theory of gravity\, neutron stars in binary system are its richest laboratory\, where\ngravity blends with astrophysics and particle physics. I will discuss the rapid recent progress made\nin modelling these systems and show how the gravitational signal can provide tight constraints on\nthe equation of state and sound speed for matter at nuclear densities\, as well as on one of the most\nimportant consequences of general relativity for compact stars: the existence of a maximum mass.\nFinally\, I will discuss how the merger may lead to a phase transition from hadronic to quark matter.\nSuch a process would lead to a signature in the post-merger gravitational-wave signal and open an\nobservational window on the production of quark matter in the present Universe. \n———————————————– \n16:00h Coffee time \n———————————————– \nMore information about these and following monthly seminars can be found at the  webpage https://sites.google.com/view/polygrav (No registration is needed)
URL:https://www.ift.uam-csic.es/event/polygonal-gravity-seminars-2/
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:20260911T004351
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:20261015T150000
DTEND;TZID=Europe/Madrid:20261015T170000
DTSTAMP:20260911T004351
CREATED:20260821T102537Z
LAST-MODIFIED:20260821T102537Z
UID:25498-1792076400-1792083600@www.ift.uam-csic.es
SUMMARY:Outreach Event Arts & Science
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/outreach-event-arts-science/
LOCATION:IFT Auditorium\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\,\, Spain
CATEGORIES:Outreach events,Scientific culture
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261019T150000
DTEND;TZID=Europe/Madrid:20261019T160000
DTSTAMP:20260911T004351
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20261026T150000
DTEND;TZID=Europe/Madrid:20261026T173000
DTSTAMP:20260911T004351
CREATED:20260821T104220Z
LAST-MODIFIED:20260821T104220Z
UID:25500-1793026800-1793035800@www.ift.uam-csic.es
SUMMARY:Eduardo Peinado (Mexico U.)
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/eduardo-peinado-mexico-u/
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:20261105T080000
DTEND;TZID=Europe/Madrid:20261105T170000
DTSTAMP:20260911T004351
CREATED:20260821T104307Z
LAST-MODIFIED:20260821T104307Z
UID:25502-1793865600-1793898000@www.ift.uam-csic.es
SUMMARY:Seminar Claudia Frugiuele (INFN\, Milan). TBA
DESCRIPTION:TBA
URL:https://www.ift.uam-csic.es/event/seminar-claudia-frugiuele-infn-milan-tba/
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