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<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesdays at 11am, CAPT Foyer – Astro Coffee<o:p></o:p></span></b></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></b></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesday 8<sup>th</sup> October, A113 CAPT at 11am – Astronomy Journal Club<o:p></o:p></span></b></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></b></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesday 8<sup>th</sup> October, A113 CAPT at 1pm – Particle Cosmology Seminar<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Theo Anton (QMUL)<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt">Generalised tests of gravity in cosmology<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-ligatures:none">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.<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">Link to join: <a href="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d" target="_blank">
https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d</a><o:p></o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt"> </span></b><span style="font-size:16.0pt;font-family:"Aptos Display",sans-serif">---<o:p></o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos Display",sans-serif">Wednesday 9<sup>th</sup> October, C5 Physics at 3.45pm – Astronomy Seminar</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Elke Roediger (Hull)<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos Display",sans-serif">---<o:p></o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos Display",sans-serif">Thursday 10<sup>th</sup> October at 1pm, A113 CAPT – Astronomy Lunch Talk</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Omar Almaini<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt">Investigating AGN activity in recently quenched galaxies at cosmic noon<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><o:p> </o:p></i></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US">We still do not understand the processes responsible for quenching star formation in massive galaxies, particularly in the distant Universe.
AGN feedback is favoured by theoretical models, but so far direct observational evidence is limited. To tackle this problem, I will present a new Chandra X-ray analysis of AGN activity in a large sample of over 500 recently quenched galaxies at cosmic noon
(1<z<3). Preliminary results reveal strong links between black hole activity and star formation, but the role of AGN in directly quenching star formation appears to be more subtle than current models predict.<o:p></o:p></span></p>
<p class="xmsonormal"><o:p> </o:p></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos Display",sans-serif">Thursday 10<sup>th</sup> October, A113 CAPT at 3pm – Particle Cosmology Seminar</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Kieran Wood (UoN)<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt">Multi-metric black holes and the Gregory-Laflamme instability<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black;mso-ligatures:none">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.<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">Link to join: <a href="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d" target="_blank">
https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d</a><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:16.0pt">---</span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt">Fridays at 4pm, CAPT Foyer – CAPT Cakes</span></b><o:p></o:p></p>
<p class="MsoNormal">---<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">If you have any events/visitors you would like included in next week’s bulletin, please let me know</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Best wishes<span style="mso-ligatures:none"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-size:6.0pt;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB">Ella<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:6.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#009BBD;mso-fareast-language:EN-GB">Ella Batchelor
</span></b><span style="font-family:"Arial",sans-serif;color:#009BBD;mso-fareast-language:EN-GB">(she/her)</span><o:p></o:p></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">Administrator</span></b><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">School of Physics & Astronomy</span><span lang="ZH-CN" style="font-size:9.0pt;font-family:"MS Gothic";color:#0F1245;mso-fareast-language:ZH-CN">
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"MS Mincho";color:#0F1245;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">University of Nottingham</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">A112a Centre for Astronomy & Particle Theory</span><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">University Park</span><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">Nottingham, NG7 2RD</span><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">+44 (0) 115 74 86778<b> </b></span><b><span lang="EN-US" style="font-size:9.0pt;color:#0F1245;mso-fareast-language:EN-GB">| </span></b><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0F1245;mso-fareast-language:EN-GB">
</span></b><span style="mso-fareast-language:EN-GB"><a href="http://nottingham.ac.uk/"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue">nottingham.ac.uk</span></a><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-fareast-language:EN-GB"><img border="0" width="484" height="109" style="width:5.0416in;height:1.1388in" id="Picture_x0020_2042549853" src="cid:image001.png@01DB1899.069BAC50"></span><span lang="EN-US" style="font-size:9.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
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