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JC tuesday 16
by Miguel Vanvlasselaer 16 Jan '24

16 Jan '24

Dear all, We restart our JC this tuesday 16 with me at 2 pm in the Sancton room. I will break the implicit rules and talk about my own work: 2306.15872 and other paper to be submitted soon. The anomalous WZW term in the chiral lagrangian opens new channel of cooling via the emission of neutrino and/or axions that might have effects in the early times of the supernovae and the protoneutron star. Best, hope to see you there, Miguel

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Fwd: Announcing a new seminar series: Tunneling in QFT
by Alberto Mariotti 20 Dec '23

20 Dec '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: Andreas Ekstedt <andreas.ekstedt(a)physics.uu.se> > Subject: Announcing a new seminar series: Tunneling in QFT > Date: 20 December 2023 at 11:32:05 CET > To: "alberto.mariotti(a)vub.be" <alberto.mariotti(a)vub.be> > Resent-From: <alberto.mariotti(a)vub.be> > > Dear colleagues, > > we are delighted to announce a new online seminar series, Tunneling in QFT, starting on 11 January 2024, and running monthly on Thursdays, usually at 14:00 CET (CEST in European summer). > > In this series, we will explore new developments in our understanding of all aspects of tunneling in quantum field theory. > > Confirmed invited speakers include: > Ian Moss (Newcastle University) - The hot big bang in a cold gas: 11 January at 14:00 CET > Silvia Pla Garcia (Kings College, London): 8 February at 14:00 CET > Yutaro Shoji (Jožef Stefan Institute and Ljubljana University): 14 March at 14:00 CET > Patrick Draper (Illinois University, Urbana): 18 April at 15:00 CEST > Lorenzo Ubaldi (Jožef Stefan Institute and Ljubljana University): 16 May at 14:00 CEST > > Registration is open. Please register to receive email announcements of each seminar, including joining instructions. > > The webpage is: https://indico.cern.ch/event/1346195/ > > Best wishes, > Andreas Ekstedt, Oliver Gould and Miha Nemevšek > > > > > > > > > När du har kontakt med oss på Uppsala universitet med e-post så innebär det att vi behandlar dina personuppgifter. För att läsa mer om hur vi gör det kan du läsa här: http://www.uu.se/om-uu/dataskydd-personuppgifter/ > > E-mailing Uppsala University means that we will process your personal data. For more information on how this is performed, please read here: http://www.uu.se/en/about-uu/data-protection-policy

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Fwd: ULB PhysTH Seminar by Camilo Garcia Cely - 15/12/2023 at 11 am
by Alberto Mariotti 13 Dec '23

13 Dec '23

Interesting seminar at ULB Friday morning. 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: Facchinetti Gaëtan <gaetan.facchinetti(a)ulb.be> > Subject: ULB PhysTH Seminar by Camilo Garcia Cely - 15/12/2023 at 11 am > Date: 13 December 2023 at 09:26:31 CET > 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, > > Next Friday, the 15th of December, we will have the pleasure to welcome Camilo García Cely (IFIC, Valencia) who will give us a seminar at 11am in room 2.N7.110 (building NO, campus Plaine). He will tell us about > > Adapting Axion Dark Matter Concepts for High-Frequency Gravitational Wave Detection > I will explore the application of ideas originally developed for axion dark matter to the search for MHz-GHz gravitational waves. I will start discussing the Gertsenshtein effect, which involves the inter-conversion of gravitational waves into electromagnetic waves in the presence of external magnetic (or electric) fields. Drawing attention to its close analogy with axions, I will argue that the Gertsenshtein effect represents a specific manifestation of gravitational-wave electrodynamics, with further effects awaiting exploration. In particular, I will discuss the potential of axion haloscopes to probe gravitational waves in the 100 kHz-100 MHz range. > > 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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Seminar 14/12 by Sokratis Trifinopoulos (MIT)
by Miguel Vanvlasselaer 12 Dec '23

12 Dec '23

Dear all, We are happy to announce the seminar of Thursday 14/12 by Sokratis Trifinopoulos (MIT) in the Sancton Room at 12.30. Sokratis will talk about "PTA gravitational waves and James Webb early galaxies: from Primordial Black Holes to Axion Clusters. " Abstract: Recent observations have granted to us two unique insights into the early universe: the presence of a low-frequency stochastic gravitational wave background detected by the NANOGrav and Pulsar Timing Array (PTA) experiments and the emergence of unusually massive galaxy candidates at high redshifts reported by the James Webb Space Telescope (JWST). In this talk, I will consider the possibility that both observations have a common origin. First, I will scrutinize primordial black holes (PBHs) in the mass range between 106 and 1013 solar masses. While superheavy PBHs act as seeds of accelerated galaxy formation capable of explaining the JWST extreme galaxies, they can also form binary mergers that source gravitational waves which can be potentially identified as the PTA signal. The analysis is performed taking into account the constraints on the relevant region of the PBH parameter space including the novel bound imposed by the so-called Ultraviolet Luminosity Function (UV LF) of galaxies observed by the Hubble Space Telescope. Then, I will discuss minicluster seeds in the initial axion density field due to the decay of the axion string network in the post-inflationary scenario. For axions heavier than 10-25 eV , the resulting clusters have a significant impact on large-scale structure, which is also strictly constrained by the UV LF. Sokratis will stay with us until the end of the week. Do not hesitate to contact him for discussions. See you there, Kind regards, Miguel

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solstice winter meeting 2023
by Alberto Mariotti 12 Dec '23

12 Dec '23

Dear All, if you plan to come to the winter solstice meeting, on 21 December 2023 in the ULB Solvay room, https://agenda.irmp.ucl.ac.be/event/5079/ please register now, we are ordering the food. 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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Fwd: ULB PhysTH Seminar by Virgile Dandoy - 08/12/2023 at 11 am
by Alberto Mariotti 06 Dec '23

06 Dec '23

Hi All, this is instead the ULB seminar on Friday morning at 11:00. Depending on the plan of Sachiko, I might go. Cheers, 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: Facchinetti Gaëtan <gaetan.facchinetti(a)ulb.be> > Subject: ULB PhysTH Seminar by Virgile Dandoy - 08/12/2023 at 11 am > Date: 5 December 2023 at 10:21:33 CET > 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, > > Virgile Dandoy (new postdoc in the service de Physique Théorique) kindly agreed to present his past and ongoing works during a seminar which will take place next Friday, the 8th of December, at 11am, in room 2.N7.110 (building NO, campus Plaine). More precisely, he will tell us about > > Clumpy Dark Matter Phenomenology: A Study of Axion Miniclusters and Primordial Black Holes > We investigate the possibility of dark matter forming small scale gravitationally bound structures. One notable illustration is given by the axion miniclusters. Emerging within a scenario where axions are produced after inflation, these structures consist of axions bound by gravitational forces, with a mass close to the one of the Moon with the radius of the Sun. Given that they would form as early as during the matter-radiation equality epoch, the initial population of axion miniclusters is subjects to many effects that alter, damage and even destroy them. We study how those structures would survive once they become bound in the galaxy and start interacting with stars. Finally, we show the typical signal in experiment we should expect once one of them encounter the Earth. We also study the new potential signal of gravitational waves from PTAs. In particular, we show that the formation of primordial black holes and the existing constrains on their abundance are seriously constraining some early universe scenarios. > > 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: JC 07/12/2023
by Alberto Mariotti 06 Dec '23

06 Dec '23

Hi All, this is the JC of tomorrow at ULB. I think I will go with a sandwich. 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: Korochkin Alexander <alexander.korochkin(a)ulb.be> > Subject: JC 07/12/2023 > Date: 5 December 2023 at 12:06:42 CET > 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, > > I would like to announce that our next JC will be this Thursday at 12:30 in the room 2NO.708. > Christian kindly volunteered to talk about > > Gravitational Wave Signals From Early Matter Domination: Interpolating Between Fast and Slow Transitions > > based on <https://arxiv.org/abs/2308.00309>arXiv:2311.12340 <https://arxiv.org/abs/2311.12340> > > > Best, > Alexander > > > 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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talk of Sachiko Kuroyanagi Wednesday 6 December at 13:30 (VUB)
by Alberto Mariotti 04 Dec '23

04 Dec '23

Dear All, here is the announcement of a talk of Sachiko Kuroyanagi who will be visiting VUB on the week 4-10 December. The talk is exceptionally on Wednesday 6 December at 13:30 (on St. Nicolas day ;) ). Sachiko will talk about "Tracking the origin of black holes with the stochastic gravitational wave background popcorn signal” Time and place: Wednesday 6 December at 13:30, in G/0-G.0.20 (Neutrino Room) at the IIHE Here the webpage of the seminar: https://indico.iihe.ac.be/event/1857/ 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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Fwd: ULB PhysTH Seminar by Hyungjin Kim - 01/12/2023 at 11 am
by Alberto Mariotti 30 Nov '23

30 Nov '23

Hi guys, interesting seminar on Friday at 11 at ULB. Cheers, 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: VERMA Sonali <sonali.verma(a)ulb.be> > Subject: ULB PhysTH Seminar by Hyungjin Kim - 01/12/2023 at 11 am > Date: 28 November 2023 at 13:47:51 CET > To: GRP_ULB_Sem_Add <GRP_physth_sem(a)ulb.be>, GRP_ULB_PhysTh <GRP_phys_th(a)ulb.be> > Resent-From: <alberto.mariotti(a)vub.be> > > Dear All, > > This Friday, at 11 am the 01st of December, we will have the pleasure of welcoming Hyungjin Kim (DESY Hamburg) who will give us a seminar in room 2.N7.110 (building NO, campus Plaine). Hyungjin will tell us about > > "Probing fluctuations of ultralight dark matter with gravitational wave detectors" > > Ultralight dark matter is a compelling dark matter candidate. Recent numerical simulations have shown that it exhibits large-scale order-one density fluctuations due to wave interference. These density fluctuations could be understood as a quasiparticle whose size and mass could be of astronomical values. In this talk, I will discuss how these density fluctuations interact with gravitational wave (GW) detectors and the prospects of current and future GW detectors in probing dark matter density within or near the solar system. I will show that with future GW detectors, we could probe a few hundred times the local dark matter density within the solar system. > > Best regards, > Sonali > 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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JC 28/11 2pm (tomorrow)
by Miguel Vanvlasselaer 27 Nov '23

27 Nov '23

Dear everyone, JC tomorrow by Kevin on The unresolved stochastic background from compact binary mergers detectable by next-generation ground-based gravitational-wave observatories. This will be based on the paper [2310.02517] (arxiv.org)<https://aps.arxiv.org/abs/2310.02517> in the Sancton room tomorrow at 2pm. Best, hope to see you there, Miguel

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