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<p class="elementtoproof" style="background:white"><b><span style="font-size:16.0pt;color:black">Monday 23<sup>rd</sup> February at 1.30pm, 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">Rayff de Souza</span><o:p></o:p></p>
<p class="elementtoproof" style="background:white"><span style="font-size:14.0pt;color:black;mso-fareast-language:EN-US">Dark Sector Interactions in Cosmology
<o:p></o:p></span></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 24<sup>th</sup> February at 1pm, A113 CAPT – 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">George Efstathiou (Cambridge)<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US">The Evidence for Dynamical Dark Energy<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;mso-ligatures:none;mso-fareast-language:EN-GB">The Dark Energy Spectroscopic Instrument (DESI) collaboration has measured baryon acoustic oscillation (BAO) features over a wide range of
redshifts with unprecedented precision. They argue that the data provide evidence for evolving dark energy, quoting 'significance' levels of 2.5-4.5 sigma depending on which additional data (CMB anisotropies and supernovae) are added to the BAO data. The favoured
model of dynamical dark energy is unusual, requiring phantom-like behaviour at high redshift. I will present a different way of looking at the DESI data that provides simple and robust tests of consistency with the LCDM cosmology. I find no evidence for a
deviation from LCDM and my analysis explains the degeneracy direction in the w_0-w_a plane found by the DESI collaborations. I will summarize some recent work on type Ia Supernova (SN) that supports my earlier claims that SN catalogues are not yet accurate
enough to constrain models of dynamical dark energy. <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="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Wednesday 25<sup>th</sup> February at 3pm, B1 Physics – EDI Colloquium<br>
</span></b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Jenni Dyer (Royal Society)</span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US">Taking an intersectional approach in STEM: Moving beyond the boxes<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US"> </span><o:p></o:p></p>
<p class="xmsonormal"><span style="font-family:"Aptos",sans-serif;color:black">In the current political climate—where public conversations about equality and diversity are increasingly polarised—adopting an intersectional approach within STEM is more critical
than ever. Intersectionality offers a powerful lens for understanding how overlapping identities – such as sex, ethnicity, gender identity, class, disability, and sexual orientation - shape experiences within science education and employment and how they then
overlap with “science identity”. This talk will highlight some of the structural barriers that persist in understanding how to take an intersectional approach and will look at how embedding intersectional thinking can be transformative when it comes to practices,
policies, decision-making and culture. <br>
<br>
Refreshments are available in C10 following the colloquium.<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">---</span><o:p></o:p></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Thursday 26<sup>th</sup> February at 1pm, A113 CAPT – Astronomy Lunch Talk</span></b><o:p></o:p></p>
<p class="elementtoproof" style="background:white"><span style="font-size:16.0pt;color:black">Rhys Jordan<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US">Infalling groups revealed by machine learning<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:14.0pt;font-family:"Aptos",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Galaxy evolution is strongly influenced by its environment, as evidenced by the prevalence of blue, star-forming galaxies in the field compared to the red, quiescent populations that dominate galaxy
clusters. Increasing evidence suggests that a significant fraction of this transformation occurs prior to cluster accretion, through so-called pre-processing in galaxy groups and filaments. Understanding where and when this pre-processing occurs is therefore
essential for disentangling the environmental influence on galaxy evolution.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;color:black">In this talk, I present the current development of a new group-identification framework designed to detect galaxy groups in cluster infall regions. Our approach combines machine learning with an
adapted Friends-of-Friends algorithm, optimised for application to spectroscopic surveys of galaxy clusters. Using mock observations from simulated data, we recover approximately 80% of the true groups across the infall region. When identifying galaxies belonging
to specific groups, we achieve an average completeness of 60% and purity of 75%. This balance between completeness and purity enables robust identification of infalling groups along with their members. Importantly, the framework does not bias the stellar mass
functions of either the group central or member populations. It therefore provides a powerful foundation for studying how galaxies in infalling groups transition into the cluster population.</span><span style="color:black"><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">Thursday 26<sup>th</sup> February at 2.45pm, 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><span style="mso-ligatures:none;mso-fareast-language:EN-GB"><o:p></o:p></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><a href="http://nottingham.ac.uk/"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:blue;mso-fareast-language:EN-GB">nottingham.ac.uk</span></a><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"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="mso-ligatures:none;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@01DCA18F.5E597AF0"></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>
<p class="MsoNormal" style="text-autospace:none"><b><span lang="EN-US" style="font-size:9.0pt;font-family:"Georgia",serif;color:#15769E;mso-fareast-language:EN-GB">Follow us</span></b><span lang="EN-US" style="font-size:9.0pt;color:#191919;mso-fareast-language:EN-GB"><br>
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