From elia.battistelli at roma1.infn.it  Sat Feb  4 18:33:40 2023
From: elia.battistelli at roma1.infn.it (Elia Battistelli)
Date: Sat, 04 Feb 2023 18:33:40 +0100
Subject: [astroseminar@Sapienza] 23/02/2023 at 16:00:  Sofia Fatigoni
Message-ID: <9232b43ac5f1c09f03ccb202cf26e89c@roma1.infn.it>


Title: Constraining the Inflationary Universe from the South Pole
Speaker:   Sofia Fatigoni
Institution: CALTECH (California Institute of Technology)
Date: Thursday Feb 23, 2023
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract: The inflation theory states that the Universe arose from a
tiny volume, and underwent a super-luminar expansion when it was 1034s 
old.
This mechanism would have left a distinct signal in its afterglow
radiation: the Cosmic Microwave Background. This signal is so faint that 
an
extremely sensitive instrument and a high noise and systematics control
are required to capture it. We are building BICEP Array, a microwave
telescope which incorporates in its focal plane a high number of
responsive and low noise pixels. We are deploying it at the South Pole, 
which
is one of the best sites on Earth for microwave observations. But even
so, atmospheric fluctuations contaminate our data. We have analised the
South Pole Atmosphere with an independent instrument, a water vapour
radiometer (WVR) located next to BICEP Array, and we have developed
a new method for atmospheric noise subtraction that doesn?t involve any
loss of information in our cosmological data.

web: https://agenda.infn.it/event/34380/

From raffaella.schneider at uniroma1.it  Sun Feb 19 20:11:46 2023
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Sun, 19 Feb 2023 20:11:46 +0100
Subject: [astroseminar@Sapienza] seminar by Alessandro Lupi,
 Friday Feb 24 at 16 in aula Conversi, Sapienza
Message-ID: <5E776307-F064-46B6-8E26-DD1127EDC2EA@uniroma1.it>

Dear Colleagues, 

I apologise if you will receive this announcement multiple times.
I am writing to advertise the following seminar by Alessandro Lupi (details below).
I kindly invite you to forward the information to interested students and colleagues.

Looking forward to meeting you on friday,

All the best

Raffaella

Prof. Raffaella Schneider
raffaella.schneider at uniroma1.it
Dipartimento di Fisica 
Senior Fellow Scuola Superiore di Studi Avanzati Sapienza
Sapienza Universit? di Roma

%%%%%%%%%%%%%%%%%%%%%
Venerd? 24 Febbrario, ore 16:00, aula Conversi

Speaker: Alessandro Lupi (Universit? dell?Insubria)

Title: Black hole formation and evolution in high-redshift galaxies

Abstract
The observations of high redshift quasars up to z~7 tell us that massive black holes (MBHs) were already in place, 
with masses well above 10^9 solar masses, when the Universe was less than 1 Gyr old.  
According to the currently accepted framework, MBHs gain most of their mass via radiatively efficient accretion, 
hence we expect they formed early in the Universe as smaller seeds. Explaining how these MBHs formed and 
rapidly grew is particularly challenging, in particular when we also consider that these MBHs seem overmassive 
compared to the local population. After highlighting the main formation mechanisms proposed to date, 
I will discuss whether the peculiar environmental conditions in which these systems form and evolve can 
lead to the formation of massive seeds, and which processes can inhibit this formation mechanism. 
I will then discuss the subsequent evolution of these protogalaxies and their central MBHs up to the observed 
masses, the interaction between the MBH and its galaxy host, and the impact of different observational 
tracers on the apparent obesity of MBHs.
Finally, I will introduce a new state-of-the-art model aimed at addressing the formation and early evolution 
of the first seed BHs, which is able to directly follow stars and BHs at a few tens of Msun resolution, 
including stellar feedback, BH accretion and feedback, and an accurate treatment of BH dynamics.

Collegamento meet (aula conversi): https://meet.google.com/szf-gndu-pwc
%%%%%%%%%%%%%%%%%%%%%

From elia.battistelli at roma1.infn.it  Wed Feb 22 10:36:32 2023
From: elia.battistelli at roma1.infn.it (Elia Battistelli)
Date: Wed, 22 Feb 2023 10:36:32 +0100
Subject: [astroseminar@Sapienza] 23/02/2023 at 16:00:  Sofia Fatigoni
Message-ID: <e39865143e60c272f9061601aa333a9d@roma1.infn.it>

Title: Constraining the Inflationary Universe from the South Pole
Speaker:   Sofia Fatigoni
Institution: CALTECH (California Institute of Technology)
Date: Thursday Feb 23, 2023
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract: The inflation theory states that the Universe arose from a
tiny volume, and underwent a super-luminar expansion when it was 1034s 
old.
This mechanism would have left a distinct signal in its afterglow
radiation: the Cosmic Microwave Background. This signal is so faint that 
an
extremely sensitive instrument and a high noise and systematics control
are required to capture it. We are building BICEP Array, a microwave
telescope which incorporates in its focal plane a high number of
responsive and low noise pixels. We are deploying it at the South Pole, 
which
is one of the best sites on Earth for microwave observations. But even
so, atmospheric fluctuations contaminate our data. We have analised the
South Pole Atmosphere with an independent instrument, a water vapour
radiometer (WVR) located next to BICEP Array, and we have developed
a new method for atmospheric noise subtraction that doesn?t involve any
loss of information in our cosmological data.

web: https://agenda.infn.it/event/34380/

From elia.battistelli at roma1.infn.it  Thu Feb 23 10:51:17 2023
From: elia.battistelli at roma1.infn.it (Elia Battistelli)
Date: Thu, 23 Feb 2023 10:51:17 +0100
Subject: [astroseminar@Sapienza] today at 16:00:  Sofia Fatigoni
Message-ID: <bc01d27d1c4c79181c88682b5cf59fe0@roma1.infn.it>


Even if we encourage the live presence at the seminars, we would like to 
share with you the link at which you could follow the seminar remotely. 
Details below:

https://uniroma1.zoom.us/j/82330282429?pwd=MktKdmlkSUxxdXlraFhKSHhJTDZnUT09


Title: Constraining the Inflationary Universe from the South Pole
Speaker:   Sofia Fatigoni
Institution: CALTECH (California Institute of Technology)
Date: Thursday Feb 23, 2023
Time: 4:00pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract: The inflation theory states that the Universe arose from a
tiny volume, and underwent a super-luminar expansion when it was 1034s 
old.
This mechanism would have left a distinct signal in its afterglow
radiation: the Cosmic Microwave Background. This signal is so faint that 
an
extremely sensitive instrument and a high noise and systematics control
are required to capture it. We are building BICEP Array, a microwave
telescope which incorporates in its focal plane a high number of
responsive and low noise pixels. We are deploying it at the South Pole, 
which
is one of the best sites on Earth for microwave observations. But even
so, atmospheric fluctuations contaminate our data. We have analised the
South Pole Atmosphere with an independent instrument, a water vapour
radiometer (WVR) located next to BICEP Array, and we have developed
a new method for atmospheric noise subtraction that doesn?t involve any
loss of information in our cosmological data.

web: https://agenda.infn.it/event/34380/

From raffaella.schneider at uniroma1.it  Fri Feb 24 12:57:44 2023
From: raffaella.schneider at uniroma1.it (Raffaella Schneider)
Date: Fri, 24 Feb 2023 12:57:44 +0100
Subject: [astroseminar@Sapienza] Seminar by Alessandro Lupi,
 today at 16:00 in Aula Conversi
Message-ID: <577BD795-7FC1-4FEE-A585-5A8D3981215A@uniroma1.it>

Dear Colleagues, 

This is a gentle reminder for the seminar by Alessandro Lupi (details below).
I kindly invite you to forward the information to interested students and colleagues.

Looking forward to meeting you later in aula Conversi,

All the best

Raffaella

Prof. Raffaella Schneider
raffaella.schneider at uniroma1.it
Dipartimento di Fisica 
Senior Fellow Scuola Superiore di Studi Avanzati Sapienza
Sapienza Universit? di Roma

%%%%%%%%%%%%%%%%%%%%%
Venerd? 24 Febbrario, ore 16:00, aula Conversi

Speaker: Alessandro Lupi (Universit? dell?Insubria)

Title: Black hole formation and evolution in high-redshift galaxies

Abstract
The observations of high redshift quasars up to z~7 tell us that massive black holes (MBHs) were already in place, 
with masses well above 10^9 solar masses, when the Universe was less than 1 Gyr old.  
According to the currently accepted framework, MBHs gain most of their mass via radiatively efficient accretion, 
hence we expect they formed early in the Universe as smaller seeds. Explaining how these MBHs formed and 
rapidly grew is particularly challenging, in particular when we also consider that these MBHs seem overmassive 
compared to the local population. After highlighting the main formation mechanisms proposed to date, 
I will discuss whether the peculiar environmental conditions in which these systems form and evolve can 
lead to the formation of massive seeds, and which processes can inhibit this formation mechanism. 
I will then discuss the subsequent evolution of these protogalaxies and their central MBHs up to the observed 
masses, the interaction between the MBH and its galaxy host, and the impact of different observational 
tracers on the apparent obesity of MBHs.
Finally, I will introduce a new state-of-the-art model aimed at addressing the formation and early evolution 
of the first seed BHs, which is able to directly follow stars and BHs at a few tens of Msun resolution, 
including stellar feedback, BH accretion and feedback, and an accurate treatment of BH dynamics.

Collegamento meet (aula conversi): https://meet.google.com/szf-gndu-pwc
%%%%%%%%%%%%%%%%%%%%%
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astroseminar at roma1.infn.it
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From paolo.pani at uniroma1.it  Mon Feb 27 15:02:09 2023
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Mon, 27 Feb 2023 15:02:09 +0100
Subject: [astroseminar@Sapienza] Gravity-theory Seminar: March 1st @4pm
 -Elisa Maggio (AEI) - Tests of general relativity in the nonlinear regime
Message-ID: <CADjeKwBvtnxuV1=QJ1hLc7DzNMzDdWMThE9uWUAUC-G=sm28yg@mail.gmail.com>

We have a seminar this week:

*Speaker: *Elisa Maggio (Albert Einstein Institute, Potsdam)
*Title: *Tests of general relativity in the nonlinear regime
*Date:  *Wednesday, March 1st at 4pm CET
*Location: *Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

*Abstract:*
Gravitational waves provide a unique opportunity to test gravity in the
dynamical and nonlinear regime. The plunge-merger stage of
binary?black-hole coalescences is the region where the bodies? velocities
reach a large fraction of the speed of light and the gravitational-wave
luminosity peaks. How much do the predictions of general relativity differ
from the ones in other theories of gravity for this stage of the binary
evolution? To address this question, we develop a parametrised waveform
model that introduces generic deviations to the plunge, merger and ringdown
stages of binary-black-hole coalescences. The novel feature of this test is
that it can capture signatures of beyond-GR physics in the merger phase of
black-hole binaries observed by the LIGO-Virgo-KAGRA Collaboration. We will
apply this test to analyse the binary?black-hole events GW150914 and
GW200129. The latter event will highlight the importance of waveform
systematics and data quality when interpreting tests of general relativity
with present gravitational-wave observations.

https://agenda.infn.it/event/34421/

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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