From paolo.pani at uniroma1.it  Mon Nov  2 12:14:38 2020
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Mon, 2 Nov 2020 12:14:38 +0100
Subject: [astroseminar@Sapienza] Gravity theory webinar Wed Nov 4th @4pm:
 Vishal Baibhav (Johns Hopkins University)
Message-ID: <CADjeKwC7--4DOBPU9M9tBtKfF26ntJ4qXyNAX-75_MD0RJUrJg@mail.gmail.com>

Dear All,

next Wednesday (*Nov 4th at 4pm*) there will be a webinar by Vishal Baibhav
(Johns Hopkins University):


*The mass gap, the spin gap, and the origin of merging binary black holes*
Two of the dominant channels to produce the black-hole binary mergers
observed by LIGO and Virgo are believed to be the isolated evolution of
stellar binaries in the field and dynamical formation in star clusters.
Their relative efficiency can be characterized by a ?mixing fraction.? Pair
instabilities prevent stellar collapse from generating black holes more
massive than about 45 M_sun . This ?mass gap? only applies to the field
formation scenario, and it can be filled by repeated mergers in clusters.
Similar reasoning applies to the binary?s effective spin. If black holes
are born slowly rotating, the high-spin portion of the parameter space (the
?spin gap?) can only be populated by black hole binaries that were
assembled dynamically. In this talk, I will show how future
gravitational-wave events in either the mass gap, the spin gap, or both can
be leveraged to infer the mixing fraction between the field and cluster
formation channels. I will also discuss how recent detections, GW190521 and
GW190412, fit in this context.

Zoom link:
https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
ID meeting: 812 8370 7469
Passcode: 915450

This and future gravity theory seminars are also available at this public
calendar:
https://docs.google.com/document/d/1KRW5GYCzd2yQQxscSNIb7syQ7HTA2RTH1HL5QL6Me8k/edit?ts=5e7d02d1

Cheers,
Paolo

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

Physics Department (Marconi Building), 2nd floor, room 253
Sapienza University of Rome
Piazzale Aldo Moro 5 - 00185 Rome (Italy)
+39 06 4991 4276 (int 24276)

-- 
________________________________________________________
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From paolo.pani at uniroma1.it  Fri Nov 20 10:12:00 2020
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Fri, 20 Nov 2020 10:12:00 +0100
Subject: [astroseminar@Sapienza] Gravity theory webinar Mon Nov 23th @noon:
	Nico Sanchis-Gual (IST, Lisbon)
Message-ID: <CADjeKwDp==r+jreUytQX444CGpEH0COF2Mk+RjYFoJU=kiyBoQ@mail.gmail.com>

Dear All,

next Monday (*Nov 23th at noon*) there will be a webinar by Nico
Sanchis-Gual (IST, Lisbon):

*Light in the dark: GW190521 as a Proca star merger*

The detections of gravitational waves are opening a new window to the
Universe. The nature of black holes and neutron stars may now be unveiled,
but gravitational radiation may also lead to exciting discoveries of new
exotic compact objects, oblivious to electromagnetic waves. In particular,
Advanced LIGO-Virgo recently reported a short gravitational-wave signal
(GW190521) interpreted as a quasi-circular merger of black holes, one at
least populating the pair-instability supernova gap. We found that GW190521
is also consistent with numerically simulated signals from head-on
collisions of two (equal mass and spin) horizonless vector boson stars (aka
Proca stars). This provides the first demonstration of close degeneracy
between these two theoretical models, for a real gravitational-wave event.

Zoom link:
https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
ID meeting: 812 8370 7469
Passcode: 915450

Calendar of the gravity theory seminars:
https://calendar.google.com/calendar/u/1?cid=Y191MGo3bG9pYzE1bjBxdGFhN3A4MTlzNDg2Y0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29t

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)

-- 
________________________________________________________
Le informazioni 
contenute in questo messaggio di posta elettronica sono strettamente 
riservate e indirizzate esclusivamente al destinatario. Si prega di non 
leggere, fare copia, inoltrare a terzi o conservare tale messaggio se non 
si ? il legittimo destinatario dello stesso. Qualora tale messaggio sia 
stato ricevuto per errore, si prega di restituirlo al mittente e di 
cancellarlo permanentemente dal proprio computer.
The information contained 
in this e mail message is strictly confidential and intended for the use of 
the addressee only.? If you are not the intended recipient, please do not 
read, copy, forward or store it on your computer. If you have received the 
message in error, please forward it back to the sender and delete it 
permanently from your computer system.

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From paolo.pani at uniroma1.it  Fri Nov 20 13:04:00 2020
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Fri, 20 Nov 2020 13:04:00 +0100
Subject: [astroseminar@Sapienza] Gravity theory webinar Mon Nov 23th
 @noon: Nico Sanchis-Gual (IST, Lisbon)
In-Reply-To: <CADjeKwDp==r+jreUytQX444CGpEH0COF2Mk+RjYFoJU=kiyBoQ@mail.gmail.com>
References: <CADjeKwDp==r+jreUytQX444CGpEH0COF2Mk+RjYFoJU=kiyBoQ@mail.gmail.com>
Message-ID: <CADjeKwA1JPxqWEmLDOfjjNL0R4HDK3DYrHac6dV98U3jJaJV_A@mail.gmail.com>

Due a last-minute issue, the seminar by Nico Sanchis-Gual was
postponed to *Mon,
Nov 30th same time (noon)*. The Zoom link remains the same.

Apologies for the inconvenience,
Paolo

On Fri, Nov 20, 2020 at 10:12 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:

> Dear All,
>
> next Monday (*Nov 23th at noon*) there will be a webinar by Nico
> Sanchis-Gual (IST, Lisbon):
>
> *Light in the dark: GW190521 as a Proca star merger*
>
> The detections of gravitational waves are opening a new window to the
> Universe. The nature of black holes and neutron stars may now be unveiled,
> but gravitational radiation may also lead to exciting discoveries of new
> exotic compact objects, oblivious to electromagnetic waves. In particular,
> Advanced LIGO-Virgo recently reported a short gravitational-wave signal
> (GW190521) interpreted as a quasi-circular merger of black holes, one at
> least populating the pair-instability supernova gap. We found that GW190521
> is also consistent with numerically simulated signals from head-on
> collisions of two (equal mass and spin) horizonless vector boson stars (aka
> Proca stars). This provides the first demonstration of close degeneracy
> between these two theoretical models, for a real gravitational-wave event.
>
> Zoom link:
> https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
>
> ID meeting: 812 8370 7469
> Passcode: 915450
>
> Calendar of the gravity theory seminars:
> https://calendar.google.com/calendar/u/1?cid=Y191MGo3bG9pYzE1bjBxdGFhN3A4MTlzNDg2Y0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29t
>
> 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)
>


-- 
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)

-- 
________________________________________________________
Le informazioni 
contenute in questo messaggio di posta elettronica sono strettamente 
riservate e indirizzate esclusivamente al destinatario. Si prega di non 
leggere, fare copia, inoltrare a terzi o conservare tale messaggio se non 
si ? il legittimo destinatario dello stesso. Qualora tale messaggio sia 
stato ricevuto per errore, si prega di restituirlo al mittente e di 
cancellarlo permanentemente dal proprio computer.
The information contained 
in this e mail message is strictly confidential and intended for the use of 
the addressee only.? If you are not the intended recipient, please do not 
read, copy, forward or store it on your computer. If you have received the 
message in error, please forward it back to the sender and delete it 
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From elia.battistelli at roma1.infn.it  Sun Nov 22 16:11:21 2020
From: elia.battistelli at roma1.infn.it (Elia Battistelli)
Date: Sun, 22 Nov 2020 16:11:21 +0100
Subject: [astroseminar@Sapienza] =?utf-8?q?23/11/2020_at_15=3A00=3A_Tomass?=
 =?utf-8?q?oni_Chisesi_Physics_Prize_seminars=3A_Jo_Dunkley_-_Karoline_Sch?=
 =?utf-8?q?=C3=A4ffner?=
Message-ID: <e79b770e522e305b43d3596f40c2935a@roma1.infn.it>


WINNERS 2020: Fondazione Sapienza - Tomassoni Chisesi Physics Prize

web: https://www.phys.uniroma1.it/fisica/en/node/10215
_________________________________________________________

Title: COSINUS - A unique perspective to shine light on the 
long-standing dark matter claim of DAMA/LIBRA
Speaker: Dr. Karoline Schaeffner (Winner under 40 category)
Institution: Max-Planck-Institute for Physics (Werner Heisenberg 
Institut, Germany)
Date: Monday 23 November 2020
Time: 3:00pm
Location: meet.google.com/twa-qvtg-fxd

Abstract
Dark matter is a main ingredient of the cosmos, its nature, despite of 
enormous progress in terrestrial direct dark matter searches, is still 
undiscovered. Most prominently, the results from DAMA/LIBRA, since more 
than two decades, create a controversial situation in the field of 
direct dark matter detection. Their latest results from DAMA phase 2 add 
further constraints since they imply that any interpretation of DAMA in 
terms of dark matter requires non-standard interactions of dark matter 
particles, or non-standard astrophysical assumptions, or both.
For a fully model-independent investigation of the nature of the 
DAMA/LIBRA claim, experiments which use the same material as DAMA/LIBRA 
are essential. Therefore, experiments applying sodium iodide (NaI) 
crystals are planned or are right on their way to solve the long-lasting 
discrepancy.

COSINUS will also use crystals of NaI, however not operates them as mere 
scintillation detectors, but as so-called cryogenic scintillating 
calorimeters operated at milli-Kelvin temperatures. COSINUS detectors 
provide a simultanous and independent measurement of both the 
temperature signal and the scintillation light signal caused by a 
particle interaction. Since the amount of produced light depends on the 
particle type (light quenching), this detection technique yields 
identification of the type of interacting particle on an event-by-event 
basis.
In this talk I will present results of our first generation prototype 
detectors and I will discussion future steps and prospects of COSINUS 
currently installing its own experimental facility at LNGS.

Motivation:
Dr. Sch?ffner has developed a novel approach for experiments searching 
Dark Matter.By using her solid expertise of mK physics, she has built a 
prototype of an experiment to search Dark Matter at LNGS based on a new 
background rejection technique with cryogenic detectors. This is the 
base for the COSINUS project now being aiming to direct observation of 
Dark Matter.

_________________________________________________________

Title: The Millimeter Sky from the Atacama Cosmology Telescope
Speaker: Prof. Jo Dunkley (Winner over 40 category)
Institution: Princeton University (USA)
Date: Monday 23 November 2020
Time: 3:40pm
Location: meet.google.com/twa-qvtg-fxd

Abstract
I will show new images of the Cosmic Microwave Background made by the 
Atacama Cosmology Telescope in Chile, capturing the universe as it was 
at 380,000 years after the Big Bang. I will describe how they are 
advancing our knowledge of cosmology, and how the new data let us weigh 
in on the concordance cosmological model known as 
?Lambda-Cold-Dark-Matter', the local expansion rate of the universe, and 
its spatial geometry.

Motivation:
For the development of innovative analysis methods for Cosmic Microwave 
Background anisotropy and polarization data, efficiently constraining 
both cosmology and fundamental physics, and producing a unifying view of 
the Physical Universe.

_________________________________________________________

From paolo.pani at uniroma1.it  Fri Nov 27 16:52:32 2020
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Fri, 27 Nov 2020 16:52:32 +0100
Subject: [astroseminar@Sapienza] Two Gravity theory webinars next week
Message-ID: <CADjeKwA=jtQqtV0b5FJkpL9KjapwYth5O+TEHcPH=txt6ipacQ@mail.gmail.com>

Dear All,

next week there will be two gravity-theory webinars:

*1) **Nico Sanchis-Gual (IST, Lisbon):* "*Light in the dark: GW190521 as a
Proca star merger"*
*Mon* (*Nov 30**th @ noon*)

The detections of gravitational waves are opening a new window to the
Universe. The nature of black holes and neutron stars may now be unveiled,
but gravitational radiation may also lead to exciting discoveries of new
exotic compact objects, oblivious to electromagnetic waves. In particular,
Advanced LIGO-Virgo recently reported a short gravitational-wave signal
(GW190521) interpreted as a quasi-circular merger of black holes, one at
least populating the pair-instability supernova gap. We found that GW190521
is also consistent with numerically simulated signals from head-on
collisions of two (equal mass and spin) horizonless vector boson stars (aka
Proca stars). This provides the first demonstration of close degeneracy
between these two theoretical models, for a real gravitational-wave event.

*2) Horng Sheng Chia (Princeton, US): "Tidal Deformation and Dissipation of
Rotating Black Holes"*
*Wed (Dec, 2nd @ 3pm) *

Black holes are never isolated in realistic astrophysical environments;
instead, they are often perturbed by complicated external tidal fields. How
does a black hole respond to these tidal perturbations? In this talk, I
will discuss both the conservative and dissipative responses of the Kerr
black hole to a weak and adiabatic gravitational field. The former
describes how the black hole would change its shape due to these tidal
interactions, and is quantified by the so-called ?Love numbers?. On the
other hand, the latter describes how energy and angular momentum are
exchanged between the black hole and its tidal environment due to the
absorptive nature of the event horizon. I will show that the Love numbers
of the Kerr black hole vanish identically ? in other words, you cannot
stretch a black hole. I will also describe how the Kerr black hole's
dissipative response implies that energy and angular momentum can either be
lost to or extracted from the black hole, with the latter process commonly
known as the black hole superradiance. I will end by discussing how these
tidal responses leave distinct imprints on the gravitational waves emitted
by binary black holes. Time permitting, I will also argue that the
ambiguity issue of Love numbers in General Relativity can be resolved
through a careful consideration of the boundary condition at asymptotic
infinity.


For both seminars the Zoom link is:
https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
ID meeting: 812 8370 7469
Passcode: 915450

Calendar of the future gravity theory seminars:
https://calendar.google.com/calendar/u/1?cid=Y191MGo3bG9pYzE1bjBxdGFhN3A4MTlzNDg2Y0Bncm91cC5jYWxlbmRhci5nb29nbGUuY29t

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)

-- 
________________________________________________________
Le informazioni 
contenute in questo messaggio di posta elettronica sono strettamente 
riservate e indirizzate esclusivamente al destinatario. Si prega di non 
leggere, fare copia, inoltrare a terzi o conservare tale messaggio se non 
si ? il legittimo destinatario dello stesso. Qualora tale messaggio sia 
stato ricevuto per errore, si prega di restituirlo al mittente e di 
cancellarlo permanentemente dal proprio computer.
The information contained 
in this e mail message is strictly confidential and intended for the use of 
the addressee only.? If you are not the intended recipient, please do not 
read, copy, forward or store it on your computer. If you have received the 
message in error, please forward it back to the sender and delete it 
permanently from your computer system.

-- 

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