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A gentle reminder of today's seminar at 1 pm. </div>
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Dear All,</div>
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We have two seminars this week, as given below. </div>
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<div style="margin: 0px;"><b>Speaker: Theo Anton </b> (QMUL) </div>
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<b><i>Seminar date: 8 October</i>, Tuesday 1 pm</b></div>
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<b><i>Venue:</i></b> Seminar Room <b><u>A 113</u></b></div>
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<b>Title: <i>Generalised tests of gravity in cosmology </i></b><br>
<br>
<b>Abstract:</b> A plethora of modified theories of gravity have been proposed over the last several decades. Testing them all observationally is a considerable challenge, so it is advantageous to develop theory-independent approaches that constrain deviations
from General Relativity in a systematic way. Many of the most precise such constraints to date are obtained from astrophysical measurements, for which deviations from GR are described by the parameterised post-Newtonian (PPN) parameters. Some attempts have
been made to perform similarly general tests on cosmological scales, but it is not clear that they refer to the same couplings as the PPN formalism does, and so interpreting results from these disparate regimes physically is difficult and potentially misleading.
With that problem in mind, I will introduce a framework, called parameterised post-Newtonian cosmology, that allows information from cosmological and astrophysical regimes to be combined consistently. I will present novel constraints on the evolution of the
PPN parameters over cosmic history, using data from CMB anisotropies and Solar System experiments concurrently, and I will explain how these ideas can be further applied to test cosmological gravity to high precision.</div>
<div style="text-align: left; text-indent: 0px; margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
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<div style="margin: 0px;"><b>Speaker: Kieran Wood (Nottingham)</b></div>
</li></ol>
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<b><i>Seminar date: 10 October</i>, Thursday 3 pm (Journal Club time)</b></div>
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<b><i>Venue:</i></b> Seminar Room <b><u>A 113</u></b></div>
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<b>Title: <i>Multi-metric black holes and the Gregory-Laflamme instability</i></b></div>
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<b>Abstract:</b> Multi-metric gravity is the umbrella term for a class of modified gravitational theories, motivated by a number of problems at the interface between gravity and particle physics, that extend general relativity (GR) via the inclusion of additional
interacting massive spin-2 fields beyond the single massless graviton of GR. Nonlinearly, the extra interactions manifest as a framework where multiple metric tensors interact with one another on the same spacetime manifold (hence the name). To date, black
hole solutions of these multi-metric theories are only understood for the simplest case of bigravity (N=2 metrics) in 4 dimensions. It is, for example, known that one class of bigravity black holes is unstable for certain values of the graviton mass, with
the instability taking the same form as the notorious Gregory-Laflamme (GL) instability plaguing higher dimensional black strings, although this feature has previously been viewed as little more than a peculiarity. In this talk, I will show how to generalise
the 4d bigravity results to the full multi-metric theory in arbitrary dimension, constructing a wide class of black hole solutions of the general theory, and determine their linear stability. I will also elucidate the link between the instabilities of these
multi-metric black holes and those of higher dimensional black strings. The result seems to suggest that the GL instability may be more fundamentally linked to the nature of massive spin-2 interactions.</div>
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<span style="font-size: 10pt; color: rgb(68, 68, 68); line-height: normal;"><b>Swagat Saurav Mishra</b></span><span style="font-size: 10pt; line-height: normal;">,</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Postdoctoral Research Associate</span></p>
<p style="text-align: left; line-height: normal; margin: 0px; font-family: "Helvetica Neue"; color: rgb(34, 34, 34);">
<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;"></span><span style="font-size: 11pt; color: rgb(32, 18, 77); line-height: normal;"><br>
</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Particle Cosmology Group, </span></p>
<p style="text-align: left; line-height: normal; margin: 0px; font-family: "Helvetica Neue"; color: rgb(34, 34, 34);">
<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">Centre for Astronomy and Particle Theory,</span></p>
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<span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">University of Nottingham, Nottingham NG7 2RD, UK.</span></p>
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<span style="font-size: 10pt; color: rgb(0, 0, 0); line-height: normal;">Website</span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">:
</span><span style="font-size: 10pt; color: rgb(17, 85, 204); line-height: normal;"><a href="https://swagatam18.wordpress.com/" target="_blank" style="color: rgb(17, 85, 204); margin-top: 0px; margin-bottom: 0px;">https://swagatam18.wordpress.com/</a></span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;"> </span></p>
<p style="text-align: left; line-height: normal; margin: 0px; font-family: "Helvetica Neue"; color: rgb(34, 34, 34);">
<span style="font-size: 10pt; color: rgb(0, 0, 0); line-height: normal;">Research Link</span><span style="font-size: 10pt; color: rgb(32, 18, 77); line-height: normal;">:</span><span style="font-size: 10pt; color: rgb(17, 85, 204); line-height: normal;"><a href="https://inspirehep.net/authors/1517353" target="_blank" style="color: rgb(17, 85, 204); margin-top: 0px; margin-bottom: 0px;">https://inspirehep.net/authors/1517353</a></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Maths-quantum-gravity-group <maths-quantum-gravity-group-bounces@lists.nottingham.ac.uk> on behalf of Swagat Mishra <Swagat.Mishra@nottingham.ac.uk><br>
<b>Sent:</b> 07 October 2024 08:00<br>
<b>To:</b> capt@nottingham.ac.uk <capt@nottingham.ac.uk>; maths-quantum-gravity-group@lists.nottingham.ac.uk <maths-quantum-gravity-group@lists.nottingham.ac.uk>; O365-Gravity Laboratory <o365-gravitylaboratory@UniofNottm.onmicrosoft.com><br>
<b>Cc:</b> Ella Batchelor (staff) <ppzeb1@exmail.nottingham.ac.uk>; Drande Patogu <ppydp10@exmail.nottingham.ac.uk>; Bobby Acharya <bacharya@ictp.it><br>
<b>Subject:</b> [Maths-quantum-gravity-group] Particle Cosmology and Gravity Seminars this week</font>
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Dear All,</div>
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We have two seminars this week, as given below. </div>
<ol start="1" data-editing-info="{"applyListStyleFromLevel":false,"orderedStyleType":3}">
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<div class="x_elementToProof" style="margin-top:0px; margin-bottom:0px"><b>Speaker: Theo Anton
</b> (QMUL) </div>
</li></ol>
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<b><i>Seminar date: 8 October</i>, Tuesday 1 pm</b></div>
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<b><i>Venue:</i></b> Seminar Room <b><u>A 113</u></b></div>
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<b>Title: <i>Generalised tests of gravity in cosmology </i></b><br>
<br>
<b>Abstract:</b> A plethora of modified theories of gravity have been proposed over the last several decades. Testing them all observationally is a considerable challenge, so it is advantageous to develop theory-independent approaches that constrain deviations
from General Relativity in a systematic way. Many of the most precise such constraints to date are obtained from astrophysical measurements, for which deviations from GR are described by the parameterised post-Newtonian (PPN) parameters. Some attempts have
been made to perform similarly general tests on cosmological scales, but it is not clear that they refer to the same couplings as the PPN formalism does, and so interpreting results from these disparate regimes physically is difficult and potentially misleading.
With that problem in mind, I will introduce a framework, called parameterised post-Newtonian cosmology, that allows information from cosmological and astrophysical regimes to be combined consistently. I will present novel constraints on the evolution of the
PPN parameters over cosmic history, using data from CMB anisotropies and Solar System experiments concurrently, and I will explain how these ideas can be further applied to test cosmological gravity to high precision.</div>
<div class="x_elementToProof" style="text-align:left; text-indent:0px; margin:0px; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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<div class="x_elementToProof" style="margin-top:0px; margin-bottom:0px"><b>Speaker: Kieran Wood (Nottingham)</b></div>
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<b><i>Seminar date: 10 October</i>, Thursday 3 pm (Journal Club time)</b></div>
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<b><i>Venue:</i></b> Seminar Room <b><u>A 113</u></b></div>
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<b>Title: <i>Multi-metric black holes and the Gregory-Laflamme instability</i></b></div>
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<b>Abstract:</b> Multi-metric gravity is the umbrella term for a class of modified gravitational theories, motivated by a number of problems at the interface between gravity and particle physics, that extend general relativity (GR) via the inclusion of additional
interacting massive spin-2 fields beyond the single massless graviton of GR. Nonlinearly, the extra interactions manifest as a framework where multiple metric tensors interact with one another on the same spacetime manifold (hence the name). To date, black
hole solutions of these multi-metric theories are only understood for the simplest case of bigravity (N=2 metrics) in 4 dimensions. It is, for example, known that one class of bigravity black holes is unstable for certain values of the graviton mass, with
the instability taking the same form as the notorious Gregory-Laflamme (GL) instability plaguing higher dimensional black strings, although this feature has previously been viewed as little more than a peculiarity. In this talk, I will show how to generalise
the 4d bigravity results to the full multi-metric theory in arbitrary dimension, constructing a wide class of black hole solutions of the general theory, and determine their linear stability. I will also elucidate the link between the instabilities of these
multi-metric black holes and those of higher dimensional black strings. The result seems to suggest that the GL instability may be more fundamentally linked to the nature of massive spin-2 interactions.</div>
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teams.microsoft.com</div>
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<b><u>A list of upcoming seminars for this term </u></b>(with rough titles)</div>
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· 15 Oct | Eemeli Tomberg (Lancaster U) | Compaction function for Primordial Black Holes</div>
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· 22 Oct | Ayngaran Thavanesan (DAMTP Cambridge) | Cosmological CPT theorem </div>
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· 29 Oct | Santiago Agui Salcedo (DAMTP Cambridge) | Open EFT for inflation</div>
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· 05 Nov | Yuyu Mo (Edinburgh Higgs Centre) | Bootstrap</div>
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· 12 Nov | Alex Jenkins (UCL) | Quantum Matter, Analogue Gravity</div>
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· 19 Nov | Bjoern Friedrich (Heidelberg) | String Phenomenology</div>
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· 26 Nov | Tamara Evstafyeva (DAMTP Cambridge) | Gravitational Waves</div>
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· 03 Dec | Emma Albertini (Imperial College London) | Gravity, Scattering Amplitudes</div>
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· 10 Dec | TBD</div>
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With Regards,</div>
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-Swagat</div>
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<span style="font-size:10pt; color:rgb(68,68,68); line-height:normal"><b>Swagat Saurav Mishra</b></span><span style="font-size:10pt; line-height:normal">,</span></p>
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<span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">Postdoctoral Research Associate</span></p>
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<span style="font-size:10pt; color:rgb(32,18,77); line-height:normal"></span><span style="font-size:11pt; color:rgb(32,18,77); line-height:normal"><br>
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<span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">Particle Cosmology Group, </span></p>
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<span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">Centre for Astronomy and Particle Theory,</span></p>
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<span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">University of Nottingham, Nottingham NG7 2RD, UK.</span></p>
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<span style="font-size:10pt; color:rgb(0,0,0); line-height:normal">Website</span><span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">:
</span><span style="font-size:10pt; color:rgb(17,85,204); line-height:normal"><a href="https://swagatam18.wordpress.com/" target="_blank" id="OWA1c527709-51b2-f0f1-2867-efda0d46121b" class="x_OWAAutoLink" style="color:rgb(17,85,204); margin-top:0px; margin-bottom:0px">https://swagatam18.wordpress.com/</a></span><span style="font-size:10pt; color:rgb(32,18,77); line-height:normal"> </span></p>
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<span style="font-size:10pt; color:rgb(0,0,0); line-height:normal">Research Link</span><span style="font-size:10pt; color:rgb(32,18,77); line-height:normal">:</span><span style="font-size:10pt; color:rgb(17,85,204); line-height:normal"><a href="https://inspirehep.net/authors/1517353" target="_blank" id="OWA13833ae4-be47-227c-4304-0a606fa2f415" class="x_OWAAutoLink" style="color:rgb(17,85,204); margin-top:0px; margin-bottom:0px">https://inspirehep.net/authors/1517353</a></span></p>
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