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X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
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TZID:Europe/Madrid
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DTSTART:20250330T010000
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DTSTART:20251026T010000
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DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART:20270328T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260611T120000
DTEND;TZID=Europe/Madrid:20260611T130000
DTSTAMP:20260610T065818
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:20260610T065818
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:20260610T065818
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:20260610T065818
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:20260625T150000
DTEND;TZID=Europe/Madrid:20260625T160000
DTSTAMP:20260610T065818
CREATED:20260525T062834Z
LAST-MODIFIED:20260525T062834Z
UID:25093-1782399600-1782403200@www.ift.uam-csic.es
SUMMARY:Seminar by Sourav Bera
DESCRIPTION:tba
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
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