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DTSTART;TZID=Europe/Madrid:20251030T120000
DTEND;TZID=Europe/Madrid:20251030T130000
DTSTAMP:20260405T202226
CREATED:20251024T105840Z
LAST-MODIFIED:20251125T081103Z
UID:23444-1761825600-1761829200@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: Weak Gravity and Perturbative Black Holes
DESCRIPTION:Speaker: Matteo Lotito (IFT) \nVenue&Time: Red Room / 12:00 \nAbstract: \nI present a brief summary of the derivation of the Weak Gravity Conjecture within perturbative string theory\, following [2403.14449]\, and highlight possible gaps that may hinder a fully consistent proof. I then analyze the existence and properties of the black hole solutions whose extremality bounds are compared to the string spectrum in the statement of the WGC. This analysis demonstrates that the black hole solutions we employ in our setup are reliable and do not undermine the validity of our results. \n 
URL:https://www.ift.uam-csic.es/event/sps-journal-club-weak-gravity-and-perturbative-black-holes/
CATEGORIES:Journal clubs,Scientific activities
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DTSTART;TZID=Europe/Madrid:20251030T170000
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DTSTAMP:20260405T202226
CREATED:20251024T105035Z
LAST-MODIFIED:20251125T080704Z
UID:23439-1761843600-1761847200@www.ift.uam-csic.es
SUMMARY:Old Journal Club: Neutrino Masses and Mixings in Gauge Models with Spontaneous Parity Violation
DESCRIPTION:Pablo Blanco (IFT) will present Neutrino Masses and Mixings in Gauge Models with Spontaneous Parity Violation de Rabindra N. Mohapatra\, Goran Senjanovic\, Jul\, 1980 Phys.Rev.D 23 (1981) 165. \nAbstract: \nUnified electroweak gauge theories based on the gauge group SU(2)L×SU(2)R×U(1)B−L\, in which the breakdown of parity invariance is spontaneous\, lead most naturally to a massive neutrino. Assuming the neutrino to be a Majorana particle\, we show that smallness of its mass can be understood as a result of the observed maximality of parity violation in low-energy weak interactions. This result is shown to be independent of the number of generations and unaffected by renormalization effects. Phenomenological consequences of this model at low energies are studied. Observation of neutrinoless double-β decay will provide a crucial test of this class of models. Implications for rare decays such as μ→eγ\, μ→eee¯\, etc. are also noted. It is pointed out that in the realm of neutral-current phenomena\, departure from the predictions of the standard model for polarized-electron-hadron scattering\, forward-backward asymmetry in e+e−→μ+μ−\, and neutrino interactions has a universal character and may be therefore used as a test of the model.
URL:https://www.ift.uam-csic.es/event/old-journal-club-neutrino-masses-and-mixings-in-gauge-models-with-spontaneous-parity-violation/
LOCATION:Blue 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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