[astroseminar at Sapienza] Gravity-theory webinar and seminar this week

[Paolo Pani]

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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