From raffaella.schneider at uniroma1.it  Mon Feb  7 09:48:13 2022
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Mon, 7 Feb 2022 09:48:13 +0100
Subject: [astroseminar@Sapienza] Reminder - 1st 2022 Quid Ultra Colloquium
 by Volker Bromm (University of Texas at Austin) - tomorrow Feb 8 at 16:30
Message-ID: <8774E9A6-95C2-48B2-A2A5-F5DB47E716AF@uniroma1.it>

Dear Colleagues,

I apologies if you receive this multiple times. 
This is to gently remind you that the first colloquium of the 2022 program QUID ULTRA? Frontiers and Controversies in Astrophysics, 
will be tomorrow, February 8 2022 at 16:30 by Volker Bromm (University of Texas at Austin).

Title and abstract are attached below. 

The seminar will be held remotely through the following zoom link:

https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09 <https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09>
 
ID riunione: 811 2290 1013
Passcode: 686688
 
The program QUID ULTRA? Frontiers and Controversies in Astrophysics is a series of monthly prestigious colloquia that will be 
running from early February till December 2021. This initiative has been funded by Sapienza University with the co-sponsorship of 
INAF/Astronomical Observatory of Rome and of the joint PhD program in Astronomy, Astrophysics and Space Science of Sapienza, 
Tor Vergata University and INAF.

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)

????????????????
February 8 2022, 16:30

Speaker: Volker Bromm (University of Texas at Austin)

Title: What do we know about the first stars and galaxies?

Abstract:
I will review the emerging theoretical framework for how stars, galaxies, and black holes transformed the early universe. Predictions for the enrichment of the intergalactic medium with heavy chemical elements, the rate of supernova explosions and gamma-ray bursts, as well as the number density and properties of the first galaxies, sensitively depend on the particle-physics nature of dark matter. To constrain the elusive first generation of stars, we can bring to bear a powerful combination of probes at high redshifts and in our local neighborhood. The latter approach, known as ?stellar archaeology? holds particular promise in light of ongoing and planned large surveys of metal-poor stars, both in the Milky Way and its dwarf satellites. It is exciting to contemplate the decade ahead, when the James Webb Space Telescope (JWST) will allow us to confront theory with observations at the edge of time.

Join Zoom Meeting
https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09 <https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09>
 
ID riunione: 811 2290 1013
Passcode: 686688
????????????????




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From paolo.pani at uniroma1.it  Mon Feb  7 19:42:27 2022
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Mon, 7 Feb 2022 19:42:27 +0100
Subject: [astroseminar@Sapienza] Gravity-theory webinar and seminar this week
Message-ID: <CADjeKwAztWu-dz5-pGHz3XW8-B8nLKLS7S_Ers=TpA6rBOuN+g@mail.gmail.com>

Dear All,

please find below the announcement for a webinar and a remote seminar
happening this week:

*1) WEBINAR*

*Speaker: *Niels Warburton (University College, National University of
Ireland, Dublin)
*Title: *Gravitational waveforms for compact binaries from second-order
self-force theory
*Date:  *Wednesday, Feb 9th at 3pm CET
*Location: *Zoom (see below)

*Abstract:*
We produce gravitational waveforms for nonspinning compact binaries
undergoing a quasicircular inspiral. Our approach is based on a
two-timescale expansion of the Einstein equations in second-order
self-force theory, which allows first-principles waveform production in
milliseconds. Although the approach is designed for extreme mass ratios,
our waveforms agree remarkably well with those from full numerical
relativity, even for comparable-mass systems. Our results will be
invaluable in accurately modelling extreme-mass-ratio inspirals for the
LISA mission and intermediate-mass-ratio systems currently being observed
by the LIGO-Virgo-KAGRA Collaboration.

The seminar will be on Zoom
https://uniroma1.zoom.us/j/86496887581?pwd=aVVRRXd2Z3pBbGZObVhEUjVZWjc0UT09
ID meeting: 864 9688 7581
Passcode: cCUG8j
Notice that this is the Zoom link for the seminars and not for the group
meetings.

*2) IN-PERSON SEMINAR*

*Speaker: *Simone Speziale (Marseille, CPT)
*Title: *New symmetries in general relativity
*Date:  *Wednesday, Feb 10th at 4pm CET
*Location: *Conversi Hall & Zoom (see below)

*Abstract:*
In the last few years there has been a lot of interest in asymptotic
symmetries in gauge theories and general relativity, in relation with deep
infrared problems and memory effects. I will first give a brief pedagogical
introduction showing how the surface charges associated with asymptotic
symmetries follow from a standard application of Noether's theorem, and
then discuss some extensions of the BMS symmetries that have been proposed
in the context of general relativity, with their motivations. Among the
results, a derivation of the flux-balance laws of gravitational waves from
Noether's theorem, new memory effects associated with the extensions, and
the possibility of discriminating bulk-equivalent descriptions of gravity
such as metric and tetrad formulations. I will conclude with a brief
outlook on the possibility of detecting the new memory effects, and
speculative implications for quantum gravity.

The Zoom link is
https://uniroma1.zoom.us/j/86496887581?pwd=aVVRRXd2Z3pBbGZObVhEUjVZWjc0UT09
ID meeting: 864 9688 7581
Passcode: cCUG8j

Cheers,
Paolo

-- 
Paolo Pani
Associate Professor
ERC StG Fellow, DarkGRA project
Junior Fellow, Scuola Superiore di Studi Avanzati Sapienza

Physics Department (Marconi Building), 3rd floor, room 334
Sapienza University of Rome
Piazzale Aldo Moro 5 - 00185 Rome (Italy)
+39 06 4991 4472 (int 24472)
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From raffaella.schneider at uniroma1.it  Fri Feb 25 14:28:25 2022
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Fri, 25 Feb 2022 14:28:25 +0100
Subject: [astroseminar@Sapienza] Announcement of the next QUID ULTRA
 colloquium by Felix Aharonian, Wednesday March 2 at 16:30, Aula Conversi,
 Sapienza University
Message-ID: <21D85C12-847D-443D-9A46-3CB192643913@uniroma1.it>

Dear Colleagues,

we are pleased to announce that the second colloquium of the 2022 program QUID ULTRA? Frontiers and Controversies in Astrophysics, 
will be by Felix Aharonian (Dublin Institute for Advanced Studies and Max-Planck-Institute for Nuclear Physics Heidelberg) on Wednesday, March 2 2022 at 16:30
in aula Conversi, Dipartimento di Fisica, Sapienza Universit? di Roma. Title and abstract are attached below. 

It will be possible to follow the seminar remotely via the zoom link:
https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09 <https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09>
 
ID riunione: 811 2290 1013
Passcode: 686688
 
For people coming from outside the Campus, please make sure to fill the google form for guests and visitors that you will need to show at the main campus gate:
https://www.uniroma1.it/en/notizia/covid-19-phase-2-procedures-students-staff-and-guests <https://www.uniroma1.it/en/notizia/covid-19-phase-2-procedures-students-staff-and-guests>
and to be ready to show your green pass.

The program QUID ULTRA? Frontiers and Controversies in Astrophysics is a series of monthly prestigious colloquia that will be 
running from early February till December 2022. This initiative has been funded by Sapienza University with the co-sponsorship of 
INAF/Astronomical Observatory of Rome and of the joint PhD program in Astronomy, Astrophysics and Space Science of Sapienza, 
Tor Vergata University and INAF.

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)

????????????????
March 2 2022 at 16:30, aula Conversi, Dipartimento di Fisica, Sapienza Universit? di Roma

Speaker: Felix Aharonian (Dublin Institute for Advanced Studies and Max-Planck-Institute for Nuclear Physics Heidelberg)

Title: PeVatrons and the "Century-old-Mistery" of Galactic Cosmic Rays

Abstract:
Despite the recent advances in Cosmic Ray studies, the origin of Galactic Cosmic Rays (CRs) is still considered a "century-old mystery" - we do not know yet which sources contribute to CR fluxes measured in the Earth's vicinity. Identifying the major CR contributors with astronomical source populations is one of the highest priorities of the field. The best carriers of information about CR factories are gamma-rays and neutrinos - the only stable and neutral secondary products of CR interactions pointing to the CR production sites. The recent years' outstanding achievement of gamma-ray astronomy was the discovery of TeV gamma-radiation from SNRs generally supporting the SNR paradigm of the origin of Galactic CRs. On the other hand, the lack of the extension of gamma-ray spectra of young SNRs well beyond 10 TeV raises doubts about their ability to contribute to the highest energy galactic CR spectrum in the so-called "knee" region above 1 PeV. Meanwhile, the ultra-high-energy (UHE; E> 100 TeV) gamma-ray observations of the clusters of young massive stars demonstrate mounting evidence of these objects (and related superbubbles) being prime contributors to Galactic CRs at PeV energies. I will discuss these observations in the context of the concept of "Young Stars versus Dead Stars". The hunt for CR PeVatrons cannot be reduced merely to the identification of the sources contributing to the local "CR fog". The term 'cosmic rays' has broader implications; after matter, radiation and magnetic fields, the relativistic nonthermal plasma constitutes the fourth substance of the observable Universe. The localisation and exploration of physical conditions and processes in these extreme CR factories, independent of their relative contributions to the 'CR fog', is a fundamental issue in its own right. I will highlight the recent exciting achievements of UHE gamma-ray astronomy in elucidating the cites of extreme CR accelerators in the Milky Way and discuss the implications of the discovery of a large number of CR PeVatrons by the LHAASO collaboration.

Join Zoom Meeting
https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09 <https://uniroma1.zoom.us/j/81122901013?pwd=M1hnRHRXZkEyeW1QMFlPQ2FXa0dNZz09>
 
ID riunione: 811 2290 1013
Passcode: 686688
????????????????

Prof. Raffaella Schneider
raffaella.schneider at uniroma1.it
Dipartimento di Fisica 
Senior Fellow Scuola Superiore di Studi Avanzati Sapienza
Sapienza Universit? di Roma
P.le A. Moro 2, 00185 Roma, Italy
Phone: +39 06 4991 4312
Skype: raffasch
Zoom: https://uniroma1.zoom.us/j/86080015153?pwd=dlV1eVNsS0xwazlMWTVZV05YeXZyUT09



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