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JC tuesday 18 2pm
by Miguel Vanvlasselaer 18 Apr '23

18 Apr '23

Hello everyone, next JC on tuesday 18 2pm. Xander will talk about the GREA model and discuss https://arxiv.org/abs/2106.16012, https://arxiv.org/abs/2111.13083 and https://arxiv.org/abs/2302.08537 [https://static.arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png]<https://arxiv.org/abs/2111.13083> A GREAT model comparison against the cosmological constant<https://arxiv.org/abs/2111.13083> Recently, a covariant formulation of non-equilibrium phenomena in the context of General Relativity was proposed in order to explain from first principles the observed accelerated expansion of the Universe, without the need for a cosmological constant, leading to the GREA theory. Here, we confront the GREA theory against the latest cosmological data, including type Ia supernovae, baryon acoustic oscillations, the cosmic microwave background (CMB) radiation, Hubble rate data from the cosmic chronometers and the recent $H_0$ measurements. We perform Markov Chain Monte Carlo analyses and a Bayesian model comparison, by estimating the evidence via thermodynamic integration, and find that when all the aforementioned data are included, but no prior on $H_0$, the difference in the log-evidence is $\\sim -9$ in favor of GREA, thus resulting in overwhelming support for the latter over the cosmological constant and cold dark matter model ($Λ$CDM). When we also include priors on $H_0$, either from Cepheids or the Tip o arxiv.org [https://static.arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png]<https://arxiv.org/abs/2106.16012> Covariant formulation of non-equilibrium thermodynamics in General Relativity<https://arxiv.org/abs/2106.16012> arxiv.org [https://static.arxiv.org/static/browse/0.3.4/images/arxiv-logo-fb.png]<https://arxiv.org/abs/2302.08537> The effect of GREA on the gravitational collapse of neutron stars<https://arxiv.org/abs/2302.08537> General Relativistic Entropic Acceleration (GREA) gives a general framework in which to study multiple out-of-equilibrium phenomena in the context of general relativity, like the late accelerated expansion of the universe or the formation of galaxies and the large scale structure of the universe. Here we analyze the conditions for collapse of a star of degenerate neutrons in the presence of entropy production due to the gravitational collapse itself. We find that the final mass and radius of the neutron star differs from that obtained with the adiabatic Tolman-Oppenheimer-Volkoff equation by a factor of order 15\\%. We also find that the minimum mass of a neutron star is $\\sim 1.1\\,M_\\odot$ and the maximum mass around $2.4\\,M_\\odot$. We discuss the possible implications for the search and interpretation of binary coalescing systems like neutron stars and neutron star-black holes detectable via their multimessenger (gravitational and electromagnetic wave) emission upon merging. arxiv.org I hope to see you there, Best, Miguel

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Fwd: BPS General Scientific Meeting 2023: 17/05/2023 in UNamur - Reminder & Final Programme
by Alberto Mariotti 14 Apr '23

14 Apr '23

Dear All, here below the announcement of the upcoming BPS general meeting in Namur on 17/05/2023. The deadline for abstract submission for an oral presentations in the parallel sessions is today! Best, Alberto #---------------------------------------------------------------------# Alberto Mariotti Vrije Universiteit Brussel (VUB) https://we.vub.ac.be/HEPVUB Phone: +32 (0) 2 629 32 15 E-mail: alberto.mariotti(a)vub.be Address: Vrije Universiteit Brussel Physics Department Elementary Particles Research Group Pleinlaan 2, 1050 Brussels, Belgium #---------------------------------------------------------------------# > Begin forwarded message: > > From: Fabrice Louche <fabrice.louche.erm(a)gmail.com> > Subject: BPS General Scientific Meeting 2023: 17/05/2023 in UNamur - Reminder & Final Programme > Date: 14 April 2023 at 10:53:46 GMT+2 > To: Undisclosed recipients: ; > Resent-From: <alberto.mariotti(a)vub.be> > > Dear Member of the BPS, > > It is my pleasure to inform you that the programme of the next BPS Scientific Meeting (organised in the University of Namur, on Wednesday 17th May 2023) has been finalised (see also attached pdf file). > > PROGRAM > > 08:15 – 09:00 Registration and coffee > 09:00 – 09:10 Welcome by the BPS President > > 09:10 – 10:00 Plenary Lecture 1 : Martine de Mazière (BIRA – IASB) > Monitoring the Earth atmosphere composition using infrared spectrometry > > 10:00 – 10:50 Plenary Lecture 2 : Olivier Deparis (UNamur) > Parchments & skins: physical methods for the identification of animal species in historical manuscripts > > 10:50 – 11:20 Coffee break > > 11:20 – 11:30 Introduction to Young Speaker Contest > 11:30 – 12:30 Young Speaker Contest (3 oral talks of 15 minutes followed by 5 minutes Q&A) > - Photonics for personal thermal regulation > Muluneh G. Abebe (UMons) > - Exploring the Higgs sector at LHC and Future Colliders > Paola Mastrapasqua (UCLouvain) > - Mechanisms of DNA-mediated allostery > Midas Segers (KULeuven) > > 12:30 – 14:30 Walking lunch and Poster session > > 14:30 – 16:45 Parallel sessions > - Astrophysics, Geophysics, and Plasma Physics > - Biophysics and Medical Physics > - Condensed Matter and Nanophysics > - Fundamental Interactions, Particle and Nuclear Physics > - Mathematical and Statistical Physics, Theoretical Astronomy > - Physics and Education (in French) > - Quantum Physics, Atoms, Molecules, and Optics > > 16:45 – 17:15 Poster session > > 17:15 – 18:00 Closing ceremony > Announcements of Master Thesis, Best Poster & Young Speaker prizes Parallel sessions > > The registration is open and will close on Tuesday 02/05/2023. > > Please note that the deadline for abstract submission is today! > > Useful links: > > Webpage of the conference: https://www.belgianphysicalsociety.be/event/conference-2023/page/80 <https://www.belgianphysicalsociety.be/event/conference-2023/page/80> > > To register to the conference:https://www.belgianphysicalsociety.be/event/conference-2023/page/83 <https://www.belgianphysicalsociety.be/event/conference-2023/page/83> > > To submit an abstract: https://www.belgianphysicalsociety.be/event/conference-2023/page/82 <https://www.belgianphysicalsociety.be/event/conference-2023/page/82> > > Deadlines > > Abstract submission: 14/04/2023 > > Registration: 02/05/2023 > > We are looking forwards to meeting you in Namur! > > > > Kind regards, > > On behalf of the BPS Board and the Conference organising committee, > > Fabrice Louche > > > > > > _________________________________ > > > Fabrice Louche, dr. > > BPS Secretary > Editor of Belgian Journal of Physics > > LPP ERM/KMS > Brussels

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Fwd: TAUP 2023 conference - abstract submission deadline 1/05
by Alberto Mariotti 11 Apr '23

11 Apr '23

FYI #---------------------------------------------------------------------# Alberto Mariotti Vrije Universiteit Brussel (VUB) https://we.vub.ac.be/HEPVUB Phone: +32 (0) 2 629 32 15 E-mail: alberto.mariotti(a)vub.be Address: Vrije Universiteit Brussel Physics Department Elementary Particles Research Group Pleinlaan 2, 1050 Brussels, Belgium #---------------------------------------------------------------------# > Begin forwarded message: > > From: LOPEZ HONOREZ Laura <Laura.Lopez.Honorez(a)ulb.be> > Subject: TAUP 2023 conference - abstract submission deadline 1/05 > Date: 11 April 2023 at 15:09:48 GMT+2 > To: LOPEZ HONOREZ Laura <Laura.Lopez.Honorez(a)ulb.be> > Resent-From: <alberto.mariotti(a)vub.be> > > Dear colleagues, > TAUP will take place end of August in Vienna this year. Do not hesitate to submit an abstract to the Cosmology and Particle Physics session of the TAUP 2023 meeting <https://indico.cern.ch/event/1199289/abstracts/#submit-abstract> or to forward this information to interested (younger) colleagues. > > The deadline for abstract submission is May 1. > > Best regards, > > Laura Lopez Honorez > > -- > Laura Lopez Honorez > Service de Physique Théorique > ULB, CP 225 > Boulevard du Triomphe, > 1050 Bruxelles, Belgium > > office: 2N7 113 > tel: 0032 (0)2 650 55 19

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JC tuesday 11/04
by Miguel Vanvlasselaer 07 Apr '23

07 Apr '23

Hello everyone, Next JC on tuesday 11/04 at 2pm by Kevin. He will talk about Gravitational waves backgrounds: detection methods and implications. Hope to see you there, Best, Miguel

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JC 04/04
by Miguel Vanvlasselaer 04 Apr '23

04 Apr '23

Hello everyone, second try for the JC on VIA sources this tuesday 04/04 at 2pm. The first message was: I (AGAIN!) will talk about https://arxiv.org/pdf/2206.01120.pdf which claims to rule out VIA sources for EWBG and puts now usual EWBG scenario at odds with EDM measurements. Maybe we can try a discussion on alternatives to usual EWBG mechanism. Best, Miguel

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visitors of our group in the upcoming months
by Alberto Mariotti 29 Mar '23

29 Mar '23

Dear All, here a list of confirmed visitors/speakers that will visit our group in the coming period. Oriol Pujolas (from IFAE). He will come one-day, giving a talk, on the 27 of April. Unfortunately he can be present only on that day for family reasons. He works on DW and many aspects of GW related to our interests, so I encourage you to be present on that day. Diego Redigolo (Firenze University). He will visit jointly VUB and ULB from 22 to 26 May. Diego is a long-term collaborator of mine about pheno aspects of SUSY. He is working now on cosmological perturbations, and he will give a talk on such topic on Thursday or Friday of that week. Yann Gouttenoire (Tel Aviv University). He will visit us from 26 to 30 June. He is an expert on phase transitions and cosmic strings. He will present us his work on Monday or Tuesday of that week (still to be defined). Best, Alberto #---------------------------------------------------------------------# Alberto Mariotti Vrije Universiteit Brussel (VUB) https://we.vub.ac.be/HEPVUB Phone: +32 (0) 2 629 32 15 E-mail: alberto.mariotti(a)vub.be Address: Vrije Universiteit Brussel Physics Department Elementary Particles Research Group Pleinlaan 2, 1050 Brussels, Belgium #---------------------------------------------------------------------#

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Fw: JC 30.03.2023
by Miguel Vanvlasselaer 29 Mar '23

29 Mar '23

This might be interesting for BH interested people tomorrow, Best, Miguel ________________________________ From: Alberto <amariotti.vub(a)gmail.com> Sent: Wednesday, March 29, 2023 1:55 PM To: Miguel Vanvlasselaer <Miguel.Vanvlasselaer(a)vub.be> Subject: Fwd: JC 30.03.2023 i cannot forward it to our mailing list fron my phone.... Sent from my iPhone, please excuse brevity and typos Begin forwarded message: From: HUFNAGEL Marco <marco.hufnagel(a)ulb.be> Date: 29 March 2023 at 12:04:51 CEST To: GRP_ULB_PhysTh <GRP_phys_th(a)ulb.be>, GRP_ULB_JC_Add <GRP_physth_jc(a)ulb.be> Subject: JC 30.03.2023 Dear all, We will have our next JC tomorrow at 12:30 in 2NO.708 as usual. Ioanna kindly volunteered to talk about Ruling Out Primordial Black Hole Formation From Single-Field Inflation based on arXiv:2211.03395. But she will also try to reference papers such as 2301.00599, 2303.01727 and 2303.12025, which claim the opposite. See you there! Best, Marco You're receiving this message because you're a member of the GRP_ULB_JC_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_jc@ulb.be/groupsubscription.as…> | Leave group<https://outlook.office365.com/owa/GRP_physth_jc@ulb.be/groupsubscription.as…> | Learn more about Microsoft 365 Groups<https://aka.ms/o365g>

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JC monday 27/03
by Miguel Vanvlasselaer 27 Mar '23

27 Mar '23

Hello everyone, Next JC on monday 27, 2pm. We start our series on baryogenesis with Alberto that will talk about a very recent paper: https://arxiv.org/abs/hep-ph/9810261 on baryogenesis from cosmic string and discuss possible ways to extend it to domain walls. My JC on VIA sources for electroweak baryogenesis is postponed, likely to monday 3/04. Hope to see you there, Best, Miguel

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Fwd: JC 16.03.2023
by Alberto Mariotti 15 Mar '23

15 Mar '23

> Begin forwarded message: > > From: HUFNAGEL Marco <marco.hufnagel(a)ulb.be> > Subject: JC 16.03.2023 > Date: 15 March 2023 at 14:01:14 GMT+1 > To: GRP_ULB_PhysTh <GRP_phys_th(a)ulb.be>, GRP_ULB_JC_Add <GRP_physth_jc(a)ulb.be> > Resent-From: <alberto.mariotti(a)vub.be> > > Dear all, > > We will have our next JC tomorrow at 12:30 in 2NO.708 as usual. > > Alexander kindly volunteered to talk about > > UHECR Echoes from the Council of Giants > > based on arXiv:2302.06489. > > See you there! > > Best, > Marco > > > > You're receiving this message because you're a member of the GRP_ULB_JC_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_jc@ulb.be/groupsubscription.as…> | Leave group <https://outlook.office365.com/owa/GRP_physth_jc@ulb.be/groupsubscription.as…> | Learn more about Microsoft 365 Groups <https://aka.ms/o365g>

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JC 14/03
by Miguel Vanvlasselaer 11 Mar '23

11 Mar '23

Hello everyone, Next JC on Tuesday 14/03 at 3 pm in J.Lemonne G/1-G.1.12. I (AGAIN!) will talk about https://arxiv.org/pdf/2206.01120.pdf which claims to rule out VIA sources for EWBG and puts now usual EWBG scenario at odds with EDM measurements. Maybe we can try a discussion on alternatives to usual EWBG mechanism. Hope to see you there, Kind regards, Miguel

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