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<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Tuesdays at 11am, CAPT Foyer – Astro Coffee</span></b><b><span style="font-size:16.0pt"><o:p></o:p></span></b></p>
<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt"><o:p> </o:p></span></b></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesday 6<sup>th</sup> May at 11.30am, A113 CAPT – 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 6<sup>th</sup> May at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar</span></b><span style="color:black"><br>
</span><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Ameek Malhotra (Swansea)<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black">Bayesian Optimisation for efficient cosmological model selection<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black"><o:p> </o:p></span></i></p>
<p class="xmsonormal"><span style="font-family:"Aptos",sans-serif;color:black">Cosmological model selection, in the framework of Bayesian inference requires the calculation of the Bayesian evidence. This can often be quite challenging, especially if the underlying
likelihood function is expensive to evaluate. I will show how a technique called Bayesian Optimisation, based on Gaussian Process regression, can be used to calculate this evidence in far fewer likelihood evaluations, offering a much more efficient approach
compared to traditional methods. If time permits, I will also discuss another ongoing project related to the reconstruction of the primordial curvature power spectrum and the equation of state from scalar induced gravitational waves.<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-family:"Aptos",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" 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">
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>
---<o:p></o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Wednesday 7<sup>th</sup> May at 3.45pm, C4 Physics – Astronomy Weekly Seminar<o:p></o:p></span></b></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Prof Jim Dunlop (Edinburgh)<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black">Charting early galaxy formation and growth with JWST and ALMA<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black"><o:p> </o:p></span></i></p>
<p class="MsoNormal" style="background:white"><span style="color:black">The James Webb Space Telescope (JWST) is transforming our view of galaxy formation and evolution in the young Universe. I will provide an overview of the latest results from the PRIMER
survey, the largest JWST Cycle-1 “Galaxies” programme which, in combination with other public JWST imaging, is now enabling us to chart the emergence of the galaxy population back to within ~300 million years of the Big Bang. Specifically, I will present and
discuss the first robust determination of the evolving UV galaxy luminosity function extending out to redshifts z~13, as well as new measurements of the galaxy stellar mass function reaching out to z~9. I will then interpret these results in the context of
our current understanding of the evolving dark matter halo mass function and the efficiency with which galaxies are able to convert their baryons into stars. Finally, I will discuss new results on the early growth of dust-enshrouded star formation, and the
prospects for future progress exploiting the combined power of JWST and the Atacama Large Millimeter Array (ALMA).<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black">---<o:p></o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Thursday 8<sup>th</sup> May at 1pm, C14 Physics – Astronomy Lunch Talk<o:p></o:p></span></b></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Rhys Jordan<o:p></o:p></span></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black">Identifying group galaxies merging with massive clusters using machine learning<o:p></o:p></span></i></p>
<p class="elementtoproof" style="background:white"><i><span style="font-family:"Aptos Display",sans-serif;color:black"><o:p> </o:p></span></i></p>
<p class="MsoNormal" style="background:white"><span style="color:black">The environment plays a critical role in shaping galaxy evolution. Galaxy clusters and their surroundings offer diverse conditions that influence galaxies before they reach the dense cluster
core, known as “pre-processing”. However, robustly identifying environmental substructures, particularly galaxy groups in the infall regions, remains a significant challenge. Traditional phase space clustering methods struggle in these transitional zones due
to severe projection effects and finger-of-god (FoG) distortions, precisely where distinguishing between local and global environments is most important. In this talk, I will present a supervised machine-learning framework for identifying group galaxies in
and around clusters using projected positions and radial velocities. Our model trains on mock observations derived from cosmological simulations tailored to match survey conditions. It classifies galaxies into three environmental categories: main cluster,
group, and neither (field). The model achieves an overall accuracy of 75% and a class-weighted precision of 81%. The main cluster class is most successfully recovered with a recall of 84%, followed by the group (77%) and neither (70%) classes. Model performance
for group classification is notably suppressed within 1xR200. However, resampling strategies allow users to tune the model for precision or recall, depending on their scientific goals. The model remains unbiased across various cluster masses and dynamical
states. Our method is flexible, observationally motivated, and well-suited for upcoming spectroscopic surveys. It provides a promising avenue for disentangling environmental influences on galaxy evolution across large-scale structures.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black"><o:p> </o:p></span></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Thursday 8<sup>th</sup> May at 3pm, A113 CAPT – Particle Cosmology Journal Club<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt">Fridays at 4pm, CAPT Foyer – CAPT Cakes<o:p></o:p></span></b></p>
<p class="MsoNormal">---<span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></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"><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@01DBBE5D.7E07D4C0"></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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