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<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Monday 20<sup>th</sup> April at 3pm, A113 CAPT – Theoretical Physics Student Seminar<o:p></o:p></span></b></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Kieran Wood<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US">Dark matter production in the early universe
<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">---<o:p></o:p></span></b></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Tuesdays at 11am, CAPT Foyer – Astro Coffee<br>
<br>
Tuesdays at 11.30am, A113 CAPT – Astronomy Journal Club<o:p></o:p></span></b></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black"><o:p> </o:p></span></b></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Tuesday 21<sup>st</sup> April at 1pm, C12 Physics – Particle Cosmology and Gravity Seminar<o:p></o:p></span></b></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Anish Ghoshal (Warsaw)<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US">Hearing the Universe Humm with Pulsar timing array: Gravitational Waves and Primordial Black Holes from First-order Phase Transition<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><i><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></i></p>
<p class="elementtoproof" style="background:white"><span style="color:black">We will discuss interpretation of the nHz stochastic gravitational wave background (SGWB) seen by NANOGrav and other Pulsar Timing Array (PTA) Collaborations in the context of supermassive
black hole (SMBH) binaries. The frequency spectrum of this stochastic background is predicted more precisely than its amplitude. We will discuss how Dark Matter friction can suppress the spectrum around nHz frequencies, where it is measured, allowing robust
and significant bounds on the Dark Matter density, which, in turn, controls indirect detection signals from galactic centers. Next we will discuss alternative cosmological interpretations including cosmic strings, phase transitions, domain walls, primordial
fluctuations and axion-like physics. We will discuss how well these different hypotheses fit the NANOGrav data, both in isolation and in combination with SMBH binaries, and address the questions: which interpretations fit the data best, and which are disfavoured.
We also discuss experimental signatures that can help discriminate between different sources of the PTA GW signals with complementary probes using CMB experiments and searches for light particles in DUNE, IceCUBE-Gen2, neutrinoless double beta decay, and forward
physics facilities at the LHC like FASER nu, etc. and with Primordial Black Hole formation and its constraints in the context to theories of dynamical electroweak symmetry breaking predict a strong first order cosmological phase transition.
<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><b><span style="color:black"><o:p> </o:p></span></b></p>
<p class="elementtoproof" style="background:white"><b><span style="color:black">Link to join:</span></b><span style="color:black"> <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" title="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">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><br>
</span><span style="font-size:16.0pt;color:black">---<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Thursday 23<sup>rd</sup> April at 1pm, A113 CAPT – Astronomy Lunch Talk<o:p></o:p></span></b></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Jake Bennett<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US">Feedback and the circumgalactic medium<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><i><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span style="color:black">Understanding how galaxies regulate their growth requires modelling the complex interplay between feedback and the circumgalactic medium (CGM), which can act as both a reservoir and a barrier for gas accretion
onto galaxies. I will present a series of cosmological simulations exploring how feedback from stars and AGN shapes the structure and evolution of the CGM across a range of environments.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Starting in the early Universe, I will discuss the high-redshift progenitors of galaxy clusters, where I explore the impact of feedback and mergers on the nascent intracluster medium. I will then turn to recent
work developing new feedback models that better capture the impact of high-energy outflows on halo gas, and how these influence galaxy growth in cosmological simulations. Together, these results highlight the central role of feedback in governing the baryon
cycle from galactic to cluster scales.<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><span style="font-size:16.0pt;color:black"><o:p> </o:p></span></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Thursdays at 3pm, A113 CAPT – Particle Cosmology Journal Club<o:p></o:p></span></b></p>
<p class="xmsonormal">---<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"><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:1.1354in" id="Picture_x0020_2042549853" src="cid:image001.png@01DCD09D.B41B6790"></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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