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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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260423T120000
DTEND;TZID=Europe/Madrid:20260423T130000
DTSTAMP:20260423T015301
CREATED:20260420T064053Z
LAST-MODIFIED:20260420T064053Z
UID:24919-1776945600-1776949200@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Tensionless String Limits in AdS5/CFT4 and the Sharpened Distance Conjecture'
DESCRIPTION:Strings\, Pheno and the Swampland (SPS) Journal Club. Every Thursday at 12:00 in the Red Room. \n\n\nTitle: Tensionless String Limits in AdS5/CFT4 and the Sharpened Distance Conjecture\n\nSpeaker: Gabriel Fenati (IFT)\n\nVenue&Time: Red Room / 12:00\n\nAbstract: Based on work in progress with M. Montero and I. Valenzuela. We extend the results of [2410.07309] by showing that all 4d Lagrangian SCFTs satisfy the bound of the Sharpened Distance Conjecture in the large N limit.  We also provide an example of a quiver SCFT\, dual to a stringy AdS background\, where the bound is violated by taking a different kind of semi-classical limit\, in which the number of gauge factors is taken to be large at fixed N.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-tensionless-string-limits-in-ads5-cft4-and-the-sharpened-distance-conjecture/
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260423T120000
DTEND;TZID=Europe/Madrid:20260423T130000
DTSTAMP:20260423T015301
CREATED:20260420T064342Z
LAST-MODIFIED:20260420T064342Z
UID:24920-1776945600-1776949200@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club: 'Infinite Heat Order in 3+1 Dimensions'
DESCRIPTION:Samuel Rosende (IFT) will present “Infinite Heat Order in 3+1 Dimensions”\n\nVenue&Time: Gray Room 2 / 12:00\n\nAbstract:\n\nWe investigate whether spontaneous symmetry breaking can persist up to arbitrarily high temperature in ultraviolet-complete quantum field theories in four spacetime dimensions. We focus on completely asymptotically free models with gauge group SU(Nc1)×SU(Nc2) and two complex scalar fields\, each transforming in the fundamental representation of one gauge factor and singlet under the other. The scalar potential contains quartic self-interactions together with a negative portal coupling between the two sectors. In the Veneziano limit\, this class of theories was previously shown to admit fixed-flow trajectories for which one scalar acquires a negative thermal mass at asymptotically large temperature\, leading to symmetry non-restoration. Here we extend that analysis to finite numbers of colours and flavours. We derive the finite-N fixed-flow equations\, compute the leading 1/N corrections to the large-N solutions\, and solve the full finite-N system numerically. We find explicit finite-N benchmark theories for which the scalar potential remains bounded from below\, the gauge sector is asymptotically free\, and one scalar thermal mass stays negative at arbitrarily high temperature. This provides an explicit perturbative example of infinite heat order in a four-dimensional ultraviolet-complete quantum field theory with a finite field content.
URL:https://www.ift.uam-csic.es/event/phenojc-infinite-heat-order-3-1-dimensions/
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:20260423T150000
DTEND;TZID=Europe/Madrid:20260423T160000
DTSTAMP:20260423T015301
CREATED:20260321T095735Z
LAST-MODIFIED:20260420T102552Z
UID:24651-1776956400-1776960000@www.ift.uam-csic.es
SUMMARY:Seminar by Maria Olalla Olea Romacho (King's College\, London)
DESCRIPTION:Title: ‘Traces from Primordial Magnetogenesis’ \n  \nSpeaker: Maria Olalla Olea Romacho (King’s College\, London) \n  \nVenue&Time: Red Room / 15:00 \n\nAbstract: Magnetic fields permeate the Universe across a wide range of scales\, from galaxies and clusters to the most underdense regions of the cosmic web. Gamma-ray observations of TeV blazars suggest the presence of magnetic fields in intergalactic voids\, where no efficient late-time astrophysical sources exist\, pointing toward a possible primordial origin and a direct link to early-Universe physics. Primordial magnetic fields arise naturally in scenarios such as inflation or cosmological phase transitions. In this seminar\, I present a multi-messenger perspective on their observational signatures. On the particle physics side\, I discuss collider-motivated models of electroweak phase transitions\, highlighting connections to blazar observations and stochastic gravitational-wave backgrounds. On the astrophysical side\, I show how primordial magnetic fields enhance small-scale structure formation\, leading to dense dark matter minihalos that boost indirect detection signals\, and how they impact high-redshift observables probed by the James Webb Space Telescope.
URL:https://www.ift.uam-csic.es/event/seminar-by-maria-olalla-olea-romacho-kings-college-london/
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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