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TZID:Europe/Paris
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220201T110000
DTEND;TZID=Europe/Paris:20220201T120000
DTSTAMP:20260408T065217
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7804-1643713200-1643716800@www.lapth.cnrs.fr
SUMMARY:Entanglement entropy of free fermions on graphs
DESCRIPTION:Abstract: \nThe von Neumann entropy is key quantity in quantum information and in the investigation of many-body models. \nIn this talk\, we will show that tools from algebraic combinatorics and from the study of time and band limiting problems can simplify its computations for systems of free fermions on graphs. 
URL:https://www.lapth.cnrs.fr/event/entanglement-entropy-of-free-fermions-on-graphs/
CATEGORIES:Upcoming Journal Club
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220203T110000
DTEND;TZID=Europe/Paris:20220203T120000
DTSTAMP:20260408T065217
CREATED:20220620T163007Z
LAST-MODIFIED:20220620T163007Z
UID:7844-1643886000-1643889600@www.lapth.cnrs.fr
SUMMARY:Primordial neutrino asymmetry evolution in the early Universe [remote talk]
DESCRIPTION:Contrary to charged lepton degeneracies which are tightly constrained by the measured baryon-to-photon ratio\, the allowed values of the primordial neutrino asymmetries cover a large range. In order to study the evolution of these asymmetries in the early Universe\, one needs to solve a set of quantum kinetic equations that include vacuum mixing effects\, mean-field potentials and collisions (scattering and annihilations with charged leptons and among (anti)neutrinos)\, which represents a genuine numerical challenge. \nIn this talk\, I will present the results of a complete three-flavour calculation with the full collision term (which was always approximated in previous numerical studies) at the epoch of neutrino decoupling\, while laying emphasis on an effective description of neutrino oscillations that corresponds to averaging over the shortest time scale. In addition to reducing the computation time while preserving the accuracy of the results\, this “Adiabatic Transfer of Averaged Oscillations” (ATAO) approximation provides a consistent framework to understand the origin of the so-called synchronous oscillations. Moreover\, it leads to new results\, such as the existence of a regime of faster oscillations when the self-interaction mean-field domination dwindles. \n  \n 
URL:https://www.lapth.cnrs.fr/event/primordial-neutrino-asymmetry-evolution-in-the-early-universe-remote-talk/
CATEGORIES:Weekly seminars
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220208T110000
DTEND;TZID=Europe/Paris:20220208T120000
DTSTAMP:20260408T065217
CREATED:20220620T162948Z
LAST-MODIFIED:20220620T162948Z
UID:7794-1644318000-1644321600@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Bridging the μHz gap in the gravitational-wave landscape with binary resonance
DESCRIPTION:Abstract: \nhttps://arxiv.org/abs/2107.04601 \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/event/journal-club-bridging-the-%ce%bchz-gap-in-the-gravitational-wave-landscape-with-binary-resonance/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220210T110000
DTEND;TZID=Europe/Paris:20220210T120000
DTSTAMP:20260408T065217
CREATED:20220620T163005Z
LAST-MODIFIED:20220620T163005Z
UID:7840-1644490800-1644494400@www.lapth.cnrs.fr
SUMMARY:Renormalisation of integrable sigma-models [remote talk]
DESCRIPTION:Classical integrable sigma-models form an important class of two-dimensional integrable field theories. It is a long standing belief that such models define renormalisable Quantum Field Theories. In this talk\, I will review some recent developments related to this question. For instance\, I will discuss some checks of this conjecture in several examples\, including theories coupling an arbitrary number of Principal Chiral Models together in an integrable way. Based on these examples\, I will comment on the emergence from these results of a common simple structure in the 1-loop RG flow of a very broad class of integrable sigma-models.
URL:https://www.lapth.cnrs.fr/event/renormalisation-of-integrable-sigma-models-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220217T110000
DTEND;TZID=Europe/Paris:20220217T120000
DTSTAMP:20260408T065217
CREATED:20220620T163006Z
LAST-MODIFIED:20220620T163006Z
UID:7842-1645095600-1645099200@www.lapth.cnrs.fr
SUMMARY:Feebly-Interacting Particles for flavour and muon g-2 anomalies
DESCRIPTION:Flavourful Feebly-Interacting Particles (FIPs) in the MeV to GeV range have a strong impact on precision frontier observables ranging from rare meson decays to the lepton anomalous magnetic moments. Based on an effective field theory approach “SM+X” along with the HEPfit package to study the effect of FIPs on B to K observables. We present an updated study of the available parameter space and constraints\, focusing on FIP scenarios allowing for a simultaneous fit of both the  g-2 muon and B-physics anomalies. \n 
URL:https://www.lapth.cnrs.fr/event/feebly-interacting-particles-for-flavour-and-muon-g-2-anomalies/
CATEGORIES:Weekly seminars
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