<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
@font-face
{font-family:"MS Gothic";
panose-1:2 11 6 9 7 2 5 8 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Aptos Display";}
@font-face
{font-family:Aptos;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
@font-face
{font-family:"\@MS Gothic";
panose-1:2 11 6 9 7 2 5 8 2 4;}
@font-face
{font-family:"\@MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Aptos",sans-serif;
mso-ligatures:standardcontextual;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#467886;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Aptos",sans-serif;
color:windowtext;}
p.xmsonormal, li.xmsonormal, div.xmsonormal
{mso-style-name:xmsonormal;
margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
p.elementtoproof, li.elementtoproof, div.elementtoproof
{mso-style-name:elementtoproof;
margin:0cm;
font-size:12.0pt;
font-family:"Aptos",sans-serif;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:11.0pt;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="#467886" vlink="#96607D" style="word-wrap:break-word">
<div class="WordSection1">
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesdays at 11am, CAPT Foyer – Astro Coffee</span></b><br>
<b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif"> </span></b><o:p></o:p></p>
<p class="xmsonormal"><b><span style="font-size:16.0pt;font-family:"Aptos",sans-serif">Tuesday 10<sup>th</sup> December at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar</span></b><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">Bruno Alexandre (Imperial College London)<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-GB">Higgs Mechanism for the Ashtekar Self-Dual Connection
<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;color:black;mso-ligatures:none;mso-fareast-language:EN-GB"><o:p> </o:p></span></i></p>
<p class="elementtoproof" style="background:white"><span style="color:black">We introduce the Higgs mechanism for the self-dual spin connection (also known as the Ashtekar connection), using the Plebanski formulation of gravity. We develop our formalism within
the framework of the chiral action and derive the equations of motion of the theory. One particular test model is explored: since anisotropy is an intrinsic property of the theory, a modified version of the spatially flat Bianchi I model with two different
scale factors is considered. We apply our formalism and derive the Friedmann equations which regulate the scale factors and the Higgs field. We also present a Proca-like term for the connection, which when reduced to minisuperspace with a positive Λ yields
a De Sitter universe with an effective cosmological constant that depends on the mass of</span><o:p></o:p></p>
<p class="elementtoproof" style="background:white"><span style="color:black">the gauge fields. We finally investigate the effect of these mass terms on gravitational waves and find that the wave equation remains unchanged relatively to GR; however the Weyl
tensor is scaled by a constant which depends on the mass of the connection components.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></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" 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><o:p></o:p></span></p>
<p class="MsoNormal"><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 12<sup>th</sup> December at 1pm, A113 CAPT – Astronomy Lunch Talk</span></b><o:p></o:p></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">Harry Stephenson (Lancaster)<o:p></o:p></span></p>
<p class="xmsonormal"><i><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">Anisotropic Quenching in
</span></i><i><span style="font-size:12.0pt;font-family:"Cambria Math",serif;color:black">𝒛∼𝟎</span></i><i><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">.</span></i><i><span style="font-size:12.0pt;font-family:"Cambria Math",serif;color:black">𝟒</span></i><i><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">
clusters: AGN or Large Scale Structure?<o:p></o:p></span></i></p>
<p class="xmsonormal"><i><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black"><o:p> </o:p></span></i></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">The mechanisms that suppress star formation in cluster galaxies are numerous, and analysing their impact is crucial to understanding galaxy evolution. Recently,
studies have shown that the quenching of satellite galaxies is dependent on their orientation angle to the brightest cluster galaxy (BCG), whereby galaxies along the BCG major axis have significantly reduced star formation compared to those that reside along
the minor axis. This has been dubbed “anisotropic quenching” or “angular conformity”.<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black"><o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">To probe this anisotropic quenching signal, we used Subaru data of Cluster Lensing And Supernovae survey with Hubble clusters to analyse the colour of ≈ 7,000 satellites,
and passive galaxy fractions, at z = 0.2 – 0.5 as a function of their orientation angle from the BCG.<o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black"><o:p></o:p></span></p>
<p class="xmsonormal"><span style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">I will discuss our detection of an anisotropic quenching signal out to cluster-centric radii of 3R200 in both satellite colour and passive galaxy fraction against
orientation angle that peaks along the major axis. The amplitude of this signal is the largest observed in studies of anisotropic quenching. We find a peak in the amplitude at ≈ 1.25R200 for both satellite colour and passive galaxy fraction. We also investigated
if the increased quenching along the major axis is a reflection of the increased density of galaxies. We find that passive galaxy fractions are significantly higher along the major axis for fixed values of local density, suggesting another mechanism is preferentially
acting along the major axis. We believe that this signal is caused by preprocessing in filaments that feed satellites into the cluster along the BCG major axis.<o:p></o:p></span></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">Thursday 12<sup>th</sup> December at 3pm, A113 CAPT – Particle Cosmology Journal Club</span></b><span style="font-family:"Aptos",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal">---<o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt">Fridays at 4pm, CAPT Foyer – CAPT Cakes</span></b><span style="mso-ligatures:none"><o:p></o:p></span></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@01DB4AE2.C4730C20"></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>
</span><span style="mso-fareast-language:EN-GB"><a href="http://facebook.com/TheUniofNottingham"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0000E9">facebook.com/uniofnottingham</span></a></span><span lang="EN-US" style="font-size:9.0pt;color:#191919;mso-fareast-language:EN-GB"><br>
</span><span style="mso-fareast-language:EN-GB"><a href="http://twitter.com/UniofNottingham"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0000E9">twitter.com/uniofnottingham</span></a></span><span lang="EN-US" style="font-size:9.0pt;color:#191919;mso-fareast-language:EN-GB"><br>
</span><span style="mso-fareast-language:EN-GB"><a href="http://youtube.com/nottmuniversity"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0000E9">youtube.com/nottmuniversity</span></a></span><span lang="EN-US" style="font-size:9.0pt;color:#191919;mso-fareast-language:EN-GB"><br>
</span><span style="mso-fareast-language:EN-GB"><a href="http://instagram.com/uniofnottingham"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0000E9">instagram.com/uniofnottingham</span></a></span><span lang="EN-US" style="font-size:9.0pt;color:#191919;mso-fareast-language:EN-GB"><br>
</span><span style="mso-fareast-language:EN-GB"><a href="http://linkedin.com/company/university-of-nottingham"><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0000E9">linkedin.com/company/university-of-nottingham</span></a></span><span lang="EN-US" style="font-size:9.0pt;font-family:"Calibri",sans-serif;color:#191919"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>