From paolo.pani at uniroma1.it  Sat Jul  3 22:15:47 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Sat, 3 Jul 2021 22:15:47 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Monday July 5th
 @noon: Pedro Cunha (Aveiro University) - Constraining ultralight scalar
 fields around the M87 black hole using the EHT shadow
Message-ID: <CADjeKwCBBiCehXePjLnpM9EoCCdYTYz96JZauHZpKavQ4+DrTg@mail.gmail.com>

Announcement of the next gravity-theory webinar:

Speaker: *Pedro Cunha (Aveiro University)*
Title: *Constraining ultralight scalar fields around the M87 black hole
using the EHT shadow*
Date:* Monday, July 5th @ noon CEST*

Abstract:
*Hypothetical ultralight bosonic fields will spontaneously form macroscopic
bosonic halos around Kerr black holes, via superradiance, transferring part
of the mass and angular momentum of the black hole into the halo. Such a
process, however, is only efficient if resonant: when the Compton
wavelength of the field approximately matches the gravitational scale of
the black hole. For a complex-valued field, the process can form a
stationary, bosonic field-black hole equilibrium state - a black hole with
synchronised hair. For sufficiently massive black holes, such as the one at
the centre of the M87 supergiant elliptical galaxy, the hairy black hole
can be robust against its own superradiant instabilities, within a Hubble
time. Studying the shadows of such scalar hairy black holes, we can
constrain the amount of hair which is compatible with the Event Horizon
Telescope (EHT) observations of the M87 supermassive black hole, assuming
the hair is a condensate of ultralight scalar particles of mass ?1E?20 eV,
as to be dynamically viable. We show the EHT observations set a weak
constraint, in the sense that typical hairy black holes that could develop
their hair dynamically, are compatible with the observations, when taking
into account the EHT error bars and the black hole mass/distance
uncertainty.  We will also discuss a recent theorem establishing that an
equilibrium Black Hole must admit, under generic conditions, at least one
circular Light Ring orbit outside the horizon. The proof relies on a
topological argument and makes virtually no assumptions on the matter
content or gravity model.*


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

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.

-- 

Fai crescere i nostri giovani ricercatori
dona il?5?per?mille?alla 
Sapienza
*codice?fiscale?80209930587*

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From paolo.pani at uniroma1.it  Tue Jul 13 09:48:51 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Tue, 13 Jul 2021 09:48:51 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Wednesday July 14th
 @4pm: Maria Okounkova (Flatiron Institute,
 USA) - Binary Black Hole Mergers beyond General Relativity
Message-ID: <CADjeKwA0EF_5Y5hqgwF9Z32HJXdO5pvFAy3-VoXY7TFLMbUQ5g@mail.gmail.com>

Announcement of the next gravity-theory webinar (last one before the summer
break):

Speaker: *Maria Okounkova (Flatiron Institute, USA*)
Title: *Binary Black Hole Mergers beyond General Relativity*
Date:* Wednesday, July 14th @ 4pm CEST*

Abstract:
*At some length scale, Einstein's theory of general relativity (GR) must
break down and be reconciled with quantum mechanics in a quantum theory of
gravity. Binary black hole mergers probe the strong field, non-linear,
highly dynamical regime of gravity, and thus gravitational waves from these
systems could contain beyond-GR signatures. While LIGO presently performs
model-independent and parametrized tests of GR, in order to perform
model-dependent tests, we must have access to numerical relativity binary
black hole waveform predictions in beyond-GR theories through full
inspiral, merger, and ringdown. In this talk, I will discuss our results in
producing full numerical relativity waveforms in beyond-GR theories,
including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
gravity.*


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

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.

-- 

Fai crescere i nostri giovani ricercatori
dona il?5?per?mille?alla 
Sapienza
*codice?fiscale?80209930587*

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From paolo.pani at uniroma1.it  Wed Jul 14 09:47:39 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Wed, 14 Jul 2021 09:47:39 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Wednesday July
 14th @4pm: Maria Okounkova (Flatiron Institute,
 USA) - Binary Black Hole Mergers beyond General Relativity
In-Reply-To: <CADjeKwA0EF_5Y5hqgwF9Z32HJXdO5pvFAy3-VoXY7TFLMbUQ5g@mail.gmail.com>
References: <CADjeKwA0EF_5Y5hqgwF9Z32HJXdO5pvFAy3-VoXY7TFLMbUQ5g@mail.gmail.com>
Message-ID: <CADjeKwDT7DoiZWDt6uvY8a-VCaWZTOpU_e9DmC7joRzK6AyosA@mail.gmail.com>

Dear all,

today's seminar was cancelled due to a last-minute problem with
the speaker. More information about the new schedule will follow shortly.

Best,
Paolo


On Tue, Jul 13, 2021 at 9:48 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:

> Announcement of the next gravity-theory webinar (last one before the
> summer break):
>
> Speaker: *Maria Okounkova (Flatiron Institute, USA*)
> Title: *Binary Black Hole Mergers beyond General Relativity*
> Date:* Wednesday, July 14th @ 4pm CEST*
>
> Abstract:
> *At some length scale, Einstein's theory of general relativity (GR) must
> break down and be reconciled with quantum mechanics in a quantum theory of
> gravity. Binary black hole mergers probe the strong field, non-linear,
> highly dynamical regime of gravity, and thus gravitational waves from these
> systems could contain beyond-GR signatures. While LIGO presently performs
> model-independent and parametrized tests of GR, in order to perform
> model-dependent tests, we must have access to numerical relativity binary
> black hole waveform predictions in beyond-GR theories through full
> inspiral, merger, and ringdown. In this talk, I will discuss our results in
> producing full numerical relativity waveforms in beyond-GR theories,
> including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
> gravity.*
>
>
> Zoom link:
> https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
> ID meeting: 812 8370 7469
> Passcode: 915450
>
> 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 
permanently from your computer system.

-- 

Fai crescere i nostri giovani ricercatori
dona il?5?per?mille?alla 
Sapienza
*codice?fiscale?80209930587*

-------------- next part --------------
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From paolo.pani at uniroma1.it  Thu Jul 15 06:10:34 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Thu, 15 Jul 2021 06:10:34 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Wednesday July
 14th @4pm: Maria Okounkova (Flatiron Institute,
 USA) - Binary Black Hole Mergers beyond General Relativity
In-Reply-To: <CADjeKwDT7DoiZWDt6uvY8a-VCaWZTOpU_e9DmC7joRzK6AyosA@mail.gmail.com>
References: <CADjeKwA0EF_5Y5hqgwF9Z32HJXdO5pvFAy3-VoXY7TFLMbUQ5g@mail.gmail.com>
	<CADjeKwDT7DoiZWDt6uvY8a-VCaWZTOpU_e9DmC7joRzK6AyosA@mail.gmail.com>
Message-ID: <CADjeKwC_gUNKgpHNux8X+V8EMh4pCR+GVd7V56zt7Yrm1H2paw@mail.gmail.com>

This seminar has been postponed to next week (same day, same time):

Speaker: *Maria Okounkova (Flatiron Institute, USA*)
Title: *Binary Black Hole Mergers beyond General Relativity*
Date:* Wednesday, July 21th @ 4pm CEST*

Abstract:
*At some length scale, Einstein's theory of general relativity (GR) must
break down and be reconciled with quantum mechanics in a quantum theory of
gravity. Binary black hole mergers probe the strong field, non-linear,
highly dynamical regime of gravity, and thus gravitational waves from these
systems could contain beyond-GR signatures. While LIGO presently performs
model-independent and parametrized tests of GR, in order to perform
model-dependent tests, we must have access to numerical relativity binary
black hole waveform predictions in beyond-GR theories through full
inspiral, merger, and ringdown. In this talk, I will discuss our results in
producing full numerical relativity waveforms in beyond-GR theories,
including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
gravity.*


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

Cheers,
Paolo

On Wed, Jul 14, 2021 at 9:47 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:

> Dear all,
>
> today's seminar was cancelled due to a last-minute problem with
> the speaker. More information about the new schedule will follow shortly.
>
> Best,
> Paolo
>
>
> On Tue, Jul 13, 2021 at 9:48 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:
>
>> Announcement of the next gravity-theory webinar (last one before the
>> summer break):
>>
>> Speaker: *Maria Okounkova (Flatiron Institute, USA*)
>> Title: *Binary Black Hole Mergers beyond General Relativity*
>> Date:* Wednesday, July 14th @ 4pm CEST*
>>
>> Abstract:
>> *At some length scale, Einstein's theory of general relativity (GR) must
>> break down and be reconciled with quantum mechanics in a quantum theory of
>> gravity. Binary black hole mergers probe the strong field, non-linear,
>> highly dynamical regime of gravity, and thus gravitational waves from these
>> systems could contain beyond-GR signatures. While LIGO presently performs
>> model-independent and parametrized tests of GR, in order to perform
>> model-dependent tests, we must have access to numerical relativity binary
>> black hole waveform predictions in beyond-GR theories through full
>> inspiral, merger, and ringdown. In this talk, I will discuss our results in
>> producing full numerical relativity waveforms in beyond-GR theories,
>> including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
>> gravity.*
>>
>>
>> Zoom link:
>> https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
>> ID meeting: 812 8370 7469
>> Passcode: 915450
>>
>> 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)
>


-- 
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.

-- 

Fai crescere i nostri giovani ricercatori
dona il?5?per?mille?alla 
Sapienza
*codice?fiscale?80209930587*

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From paolo.pani at uniroma1.it  Wed Jul 21 06:27:01 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Wed, 21 Jul 2021 06:27:01 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Wednesday July
 14th @4pm: Maria Okounkova (Flatiron Institute,
 USA) - Binary Black Hole Mergers beyond General Relativity
In-Reply-To: <CADjeKwC_gUNKgpHNux8X+V8EMh4pCR+GVd7V56zt7Yrm1H2paw@mail.gmail.com>
References: <CADjeKwA0EF_5Y5hqgwF9Z32HJXdO5pvFAy3-VoXY7TFLMbUQ5g@mail.gmail.com>
	<CADjeKwDT7DoiZWDt6uvY8a-VCaWZTOpU_e9DmC7joRzK6AyosA@mail.gmail.com>
	<CADjeKwC_gUNKgpHNux8X+V8EMh4pCR+GVd7V56zt7Yrm1H2paw@mail.gmail.com>
Message-ID: <CADjeKwATU+_-mVivx2FOQMM4ev5oLii2ss3VOGgg+a+pjwsGug@mail.gmail.com>

Reminder for today's gravity-theory webinar:

Speaker: *Maria Okounkova (Flatiron Institute, USA*)
Title: *Binary Black Hole Mergers beyond General Relativity*
Date:* Wednesday, July 21th @ 4pm CEST*

Cheers,
Paolo


On Thu, Jul 15, 2021 at 6:10 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:

> This seminar has been postponed to next week (same day, same time):
>
> Speaker: *Maria Okounkova (Flatiron Institute, USA*)
> Title: *Binary Black Hole Mergers beyond General Relativity*
> Date:* Wednesday, July 21th @ 4pm CEST*
>
> Abstract:
> *At some length scale, Einstein's theory of general relativity (GR) must
> break down and be reconciled with quantum mechanics in a quantum theory of
> gravity. Binary black hole mergers probe the strong field, non-linear,
> highly dynamical regime of gravity, and thus gravitational waves from these
> systems could contain beyond-GR signatures. While LIGO presently performs
> model-independent and parametrized tests of GR, in order to perform
> model-dependent tests, we must have access to numerical relativity binary
> black hole waveform predictions in beyond-GR theories through full
> inspiral, merger, and ringdown. In this talk, I will discuss our results in
> producing full numerical relativity waveforms in beyond-GR theories,
> including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
> gravity.*
>
>
> Zoom link:
> https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
> ID meeting: 812 8370 7469
> Passcode: 915450
>
> Cheers,
> Paolo
>
> On Wed, Jul 14, 2021 at 9:47 AM Paolo Pani <paolo.pani at uniroma1.it> wrote:
>
>> Dear all,
>>
>> today's seminar was cancelled due to a last-minute problem with
>> the speaker. More information about the new schedule will follow shortly.
>>
>> Best,
>> Paolo
>>
>>
>> On Tue, Jul 13, 2021 at 9:48 AM Paolo Pani <paolo.pani at uniroma1.it>
>> wrote:
>>
>>> Announcement of the next gravity-theory webinar (last one before the
>>> summer break):
>>>
>>> Speaker: *Maria Okounkova (Flatiron Institute, USA*)
>>> Title: *Binary Black Hole Mergers beyond General Relativity*
>>> Date:* Wednesday, July 14th @ 4pm CEST*
>>>
>>> Abstract:
>>> *At some length scale, Einstein's theory of general relativity (GR) must
>>> break down and be reconciled with quantum mechanics in a quantum theory of
>>> gravity. Binary black hole mergers probe the strong field, non-linear,
>>> highly dynamical regime of gravity, and thus gravitational waves from these
>>> systems could contain beyond-GR signatures. While LIGO presently performs
>>> model-independent and parametrized tests of GR, in order to perform
>>> model-dependent tests, we must have access to numerical relativity binary
>>> black hole waveform predictions in beyond-GR theories through full
>>> inspiral, merger, and ringdown. In this talk, I will discuss our results in
>>> producing full numerical relativity waveforms in beyond-GR theories,
>>> including dynamical Chern-Simons gravity and Einstein dilaton Gauss-Bonnet
>>> gravity.*
>>>
>>>
>>> Zoom link:
>>> https://uniroma1.zoom.us/j/81283707469?pwd=SzkyMk5jRm0xcEN3WE5MYVh1RVFtQT09
>>> ID meeting: 812 8370 7469
>>> Passcode: 915450
>>>
>>> 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)
>>
>
>
> --
> 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 
permanently from your computer system.

-- 

Fai crescere i nostri giovani ricercatori
dona il?5?per?mille?alla 
Sapienza
*codice?fiscale?80209930587*

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From paolo.pani at uniroma1.it  Mon Jul 26 10:30:37 2021
From: paolo.pani at uniroma1.it (Paolo Pani)
Date: Mon, 26 Jul 2021 10:30:37 +0200
Subject: [astroseminar@Sapienza] Gravity theory webinar: Wednesday July 28th
 @4pm: Francesco Di Filippo (Yukawa Institute) - On the assumptions leading
 to the information loss paradox
Message-ID: <CADjeKwAj0UyiYO5Y27ao3_w=eUn7=qmbgW6=wXQ1P70aLmPv+Q@mail.gmail.com>

Last gravity-theory webinar before the summer break:

Speaker: *Francesco Di Filippo (Yukawa Institute, JP)*
Title: *On the assumptions leading to the information loss paradox*
Date: *Wednesday, July 28th @ 4pm CEST*

Abstract:
*The information loss paradox is usually stated as an incompatibility
between general relativity and quantum mechanics. However, the assumptions
leading to the problem are often overlooked and, in fact, a careful
inspection of the main hypothesises suggests a radical reformulation of the
problem. Indeed, I will present a thought experiment that shows the
existence of an incompatibility between (i) the validity of the laws of
general relativity to describe infalling matter far from the Planckian
regime, and (ii) the so-called central dogma which states that as seen from
an outside observer a black hole behaves like a quantum system whose number
of degrees of freedom is proportional to the horizon area. We critically
revise the standard arguments in support of the central dogma, and argue
that they cannot hold true unless some new physics is invoked even before
reaching Planck scales. This leads to the counterintuitive result that the
information loss problem, in its current formulation, is not necessarily
related to any loss of information or lack of unitarity. Semiclassical
general relativity and quantum mechanics can be perfectly compatible before
reaching the final stage of the black hole evaporation where, instead, a
consistent theory of quantum gravity is needed to make any prediction.*


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

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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