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September 2024

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Fwd: ULB PhysTH Seminar by Jeesun Sk - 23/09/2024 at 11 am
by Alberto Mariotti 17 Sep '24

17 Sep '24

#---------------------------------------------------------------------# Alberto Mariotti Vrije Universiteit Brussel (VUB) https://hep.research.vub.be Phone: +32 (0) 2 629 32 15 E-mail: alberto.mariotti(a)vub.be Address: Vrije Universiteit Brussel Physics Department Pleinlaan 2, 1050 Brussels, Belgium #---------------------------------------------------------------------# > Begin forwarded message: > > From: FACCHINETTI Gaëtan <gaetan.facchinetti(a)ulb.be> > Subject: Re: ULB PhysTH Seminar by Jeesun Sk - 23/09/2024 at 11 am > Date: 17 September 2024 at 08:29:05 CEST > To: GRP_ULB_PhysTh <GRP_phys_th(a)ulb.be>, GRP_ULB_Sem_Add <GRP_physth_sem(a)ulb.be> > Resent-From: <alberto.mariotti(a)vub.be> > > Dear All, > > Please find below the title and abstract for next-week seminar (Monday 23/09/2024 at 11 am). > > Studying dark sector imprints in cosmology and ground based experiments > Relativistic degrees of freedom or N_eff is one of the crucial cosmological parameters and is sensitive to extra radiation energy density at the time of neutrino decoupling. The precise measurement of $N_eff$ at the time of CMB formation by Planck 2018 can be used to understand fundamental interactions and to shed light on beyond standard model (BSM) scenarios. In this talk I will explain how N_eff can probe light (MeV) freeze in dark matter models which contain additional neutrino injection at late time. We propose a scenario where a long lived scalar decays to a dark matter and active neutrinos after BBN. Despite the feeble coupling of DM the parameter space can be probed via N_eff. I will also talk about how N_eff at CMB can constrain light Z' gauge boson realized in generic BSM U(1)_X scenarios. Finally, from the perspective of ground based experiments, I will show how table top experiments like optically trapped nanospheres can shed light on MeV scale dark matter and other BSM particles like ALP. > > Best regards, > > Gaétan > >> Le 16 sept. 2024 à 13:23, FACCHINETTI Gaëtan <gaetan.facchinetti(a)ulb.be> a écrit : >> >> Dear All, >> >> I am happy to announce our first seminar of this academic year. Jesus Sk (IACS, Kolkata) will give us a seminar next Monday, the 23rd of September, at 11am in room 2.N7.110 (building NO, campus Plaine). Please note the unusual time slot! In case 11am is inconvenient for too many of you, please let me know and we can try to move it later that day (if it suits the speaker too). The title and abstract will be sent as soon as possible. >> >> Best regards, >> >> Gaétan > > > > You're receiving this message because you're a member of the GRP_ULB_Sem_Add group from Université Libre de Bruxelles. To take part in this conversation, reply all to this message. > > View group files <https://outlook.office365.com/owa/GRP_physth_sem@ulb.be/groupsubscription.a…> | Leave group <https://outlook.office365.com/owa/GRP_physth_sem@ulb.be/groupsubscription.a…> | Learn more about Microsoft 365 Groups <https://aka.ms/o365g> > >

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Fwd: 2024 Jacques Solvay International Chair in Physics (Professor Samaya Nissanke) - Tuesday 1 October at 4:00 pm
by Alberto 16 Sep '24

16 Sep '24

Sent from my iPhone, please excuse brevity and typos Begin forwarded message: > From: Isabelle Van Geet <Isabelle.vanGeet(a)solvayinstitutes.be> > Date: 16 September 2024 at 14:29:12 CEST > To: Isabelle Van Geet <Isabelle.vanGeet(a)solvayinstitutes.be> > Subject: 2024 Jacques Solvay International Chair in Physics (Professor Samaya Nissanke) - Tuesday 1 October at 4:00 pm > > Dear Colleagues, > > We are pleased to announce the Inaugural Lecture of the 2024 Jacques Solvay International Chair in Physics by Professor Samaya Nissanke (UvA & Nikhef, The Netherlands). > > The lecture will be held on Tuesday 1 October at 4:00 p.m (ULB, Campus Plaine, Building NO, 5th Floor, Salle Solvay). > > Title: New Perspectives onto the Universe in the Era of Multi-Messenger Astrophysics > > Abstract: Since the revolutionary discovery of gravitational wave (GW) emission from a binary black hole merger in 2015, the remarkable GW detectors LIGO, Virgo and KAGRA have detected at least ninety compact object mergers. These events are transforming modern astronomy. In particular, the first binary neutron star merger, dubbed GW170817, was observed in both gravitational and electromagnetic radiation, thus opening up a new era in multi-messenger astrophysics. The multi-messenger characterisation of such an event has enabled major advances into diverse fields of modern physics from gravity, high-energy astrophysics, nuclear physics, to cosmology. In this talk, I will present a review of gravitational wave observations to date, as well as my work in strong-field gravity astrophysics and how combining observations, theory and experiment have been key in making progress in this field. I will present the challenges and the opportunities that have emerged in multi-messenger astrophysics, and what the future holds in this new era. > > Everybody is cordially invited! > > Best wishes, > Marc Henneaux >

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