BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//7.2.3.1//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:5992@i2m.univ-amu.fr DTSTART;TZID=Europe/Paris:20220707T170000 DTEND;TZID=Europe/Paris:20220707T183000 DTSTAMP:20241120T200713Z URL:https://www.i2m.univ-amu.fr/evenements/presentations-de-stages-de-mast er-3/ SUMMARY:Mathilde Guillaud\, Yohann Lebouazda (CPT): Présentations de sta ges de master DESCRIPTION:Mathilde Guillaud\, Yohann Lebouazda: Présentation des trava ux effectués par les étudiant⋅es du M2 de Physique dans le cadre de st ages au sein du CPT.\nMathilde Guillaud\, « Beyond freeze-out: phenomenol ogy of hidden sector Dark Matter models »\nThe nature of Dark Matter (DM ) remains to this day one of the biggest mysteries of our Universe. Though \, Weakly Interacting Particles (WIMPs) have become one of the most popula r theories for Dark Matter. In this model\, the DM candidate is a Dirac fe rmion that couples to the Standard Model (SM) via a light pseudoscalar Axi on-Like Particle (ALP)\, in a DFSZ-like model.\nExperiments and astrophysi cal constraints provided quite stringent bounds on the parameter space (ma sses and couplings) and the standard production process\, i.e. freeze-out might not be enough to get the observed relic density. Freeze-in and seque ntial freeze-in have thus gained popularity and the latter will be the foc us of this report. The procedure to treat this process is adapted from a p aper by Belanger et. al. (2020)\, which considers a similar model with a s calar mediator.\nYohann Lebouazda\, « Self-consistent stationary equilibr ium of a chaotic system: Application to a collisionless plasma in toroidal geometry »\nWe study the collective dynamics of a collisionless plasma c ontained in a torus\, which is subjected to an exterior magnetic field gen erated by a coil curled up on its surface. The Hamiltonian framework is us ed to describe the dynamical context\, which is in turn completed by a max imal entropy principle in order to couple this aspect to statistical eleme nts of the system through the Maxwell-Vlasov formalism. The outcome is a s elf-consistent problem\, which might find applications in the understandin g of chaos’ role in plasma confinement and tokamak Physics.\n\n \;\n \n\n\nLe séminaire des doctorant⋅es de l'I2M et du CPT à Luminy regrou pe chaque semaine les doctorant⋅es du site autour d'un exposé plus ou m oins (in)formel\, dans un cadre convivial. Il est évidemment ouvert aux étudiant⋅es de master et aux doctorant⋅es d'autres laboratoires.\n\nC 'est au rez-de-chaussée du bâtiment de « l'ancienne BU »\, dans la sal le « Séminaire 2 » (au fond à gauche en sortant de l'escalier si vous venez de l'étage\, au fond à droite si vous entrez par le rez-de-chauss ée). Attention : l'entrée dans le labo nécessite un badge. En cas de so uci (de type : être bloqué⋅e dehors)\, appeler le 04 91 26 95 91. CATEGORIES:Séminaire,Rencontres doctorant⋅es I2M-CPT LOCATION:I2M Luminy - Ancienne BU\, Salle Séminaire2 (RdC)\, 163 Avenue de Luminy\, 13009 Marseille\, France\, X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=163 Avenue de Luminy\, 1300 9 Marseille\, France\, ;X-APPLE-RADIUS=100;X-TITLE=I2M Luminy - Ancienne B U\, Salle Séminaire2 (RdC):geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:DAYLIGHT DTSTART:20220327T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST END:DAYLIGHT END:VTIMEZONE END:VCALENDAR