From paolo.pani at uniroma1.it  Tue Nov 29 12:21:39 2022
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Tue, 29 Nov 2022 12:21:39 +0100
Subject: [astroseminar@Sapienza] Gravity-theory seminar: Wed 30/11 at 1pm in
 Sala Lauree: Joao Luis Rosa (Tartu U.) - "Observational properties of
 bosonic stars from orbital motion and accretion disks"
Message-ID: <CADjeKwC4qK217qTTNC7d2fjEmSO55uWJMhB_PyDT6fjvpPJCeQ@mail.gmail.com>

Dear everyone,

this week we have Joao Luis Rosa visiting from Tartu University and giving
a seminar. Please find information below (note the unusual time and
location).

%%%%%
*Speaker: *Joao Luis Rosa (Tartu U.)
*Title: *Observational properties of bosonic stars from orbital motion and
accretion disks

*Date:*  Wednesday, Novembre 30th at 1pm CET
*Location:* Sala Lauree


*Abstract:  *
In the recent years, our understanding of the galactic centre has grown
rapidly with the joint efforts of large international collaborations like
the GRAVITY, who detected infrared flares close to the innermost stable
circular orbit (ISCO) of the supermassive black-hole at the galactic
centre, and the Event Horizon Telescope (EHT), which recently published the
first picture of a black-hole shadow from Sgr A*. These observations are
consistent with the predictions from General Relativity (GR) in black-hole
spacetimes. However, due to the large experimental imprecisions, the data
are not able to exclude the possibility of the central massive object in
our galaxy not being a black-hole but instead some exotic compact object
that mimics the qualitative properties of black-hole exteriors. In this
talk, we explore a particular example of such alternative compact objects:
bosonic stars (Boson and Proca stars), and the possibility of these
observations being consistent with the presence of one of these exotic
stars at the galactic centre.
%%%%

Best,
Paolo





-- 
Paolo Pani
Professor of Theoretical Physics
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)
https://web.uniroma1.it/gmunu/
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