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Dear All,</div>
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<span style="line-height: 1.38;">We have two seminars this week, whose details are provided below - </span></div>
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<span style="color: black;"><b>Speaker: </b></span><span style="color: rgb(0, 0, 0);"><b>Katy Clough</b></span><span style="color: black;"><b> </b>(QMUL)</span></div>
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<b>Seminar date:</b> <b>12th May, Tuesday, 1 pm </b>UK time</div>
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<b>Venue:</b> <b>C12</b> <b>(Physics Building)</b></div>
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<span style="color: black;"><b>Title: </b></span><span style="color: rgb(0, 0, 0);"><b>Probing beyond GR and the Standard Model using gravitational waves</b></span></div>
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<b>Abstract:</b></div>
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I will discuss recent numerical simulations that model deviations from the vacuum BH + GR paradigm in the strong field regime of comparable mass black hole mergers. I will review recent advances, and highlight the challenges ahead to properly model these effects
and test them in real data.</div>
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<b>Speaker: Maria Mylova </b>(IPMU,Japan)</div>
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<b>Seminar date:</b> <b>13th May, Wednesday, 2 pm </b>UK time</div>
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<b>Venue:</b> <b>A113</b> <b>(Physics Building)</b></div>
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<span style="color: black;"><b>Title: </b></span><span style="color: rgb(0, 0, 0);"><b>Gauge fixing in open quantum systems</b></span></div>
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<b>Abstract:</b></div>
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Understanding how to gauge-fix open quantum field theories is essential for building consistent open frameworks for cosmology and gravity, where gauge symmetry must coexist with dissipation and noise and decoherence. I will present our recent work developing
explicit top-down constructions of open effective field theories (EFTs) for gauge degrees of freedom, with particular emphasis on the role of gauge fixing. We implement BRST quantisation on the Schwinger-Keldysh contour and show that the in-in boundary conditions
reduce the doubled global BRST symmetry to a single diagonal copy. This diagonal BRST symmetry is nevertheless sufficient to guarantee that the influence functional remains gauge invariant under two independent gauge transformations, retarded and advanced,
independently of the choice of initial state, the presence of symmetry-breaking phases, and whether the gauge theory is Abelian or non-Abelian. I will also remark that once a consistent quantisation scheme is chosen, the Schwinger-Keldysh path integral is
uniquely determined, and with it the rules that constrain the construction of open EFTs. I will conclude by outlining bottom-up implications, and how these principles provide a systematic route to causal, gauge-invariant open EFTs suitable for cosmological
and gravitational applications.</div>
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Based on:</div>
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Gauging Open EFTs from the top down <a href="https://arxiv.org/abs/2512.17089" id="OWA37284bd8-cf29-c440-dad5-ab65f6e14699" class="OWAAutoLink">
https://arxiv.org/abs/2512.17089</a> </div>
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Schwinger-Keldysh path integral for gauge theories <a href="https://arxiv.org/abs/2604.26941" id="OWAf3c156d8-3c19-d66f-5e42-64bd76b41b04" class="OWAAutoLink">
https://arxiv.org/abs/2604.26941</a></div>
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<b>Link to join:</b></div>
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<span style="color: rgb(0, 0, 0);"> </span><span style="color: rgb(5, 99, 193);"><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" id="OWAbbc0ef32-2ae8-9a4a-3086-9ce3ca27fb14" class="OWAAutoLink" 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" data-auth="NotApplicable" data-linkindex="0" style="color: rgb(5, 99, 193); margin: 0px;"><u>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</u></a></span></div>
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<b><i>List of the following four upcoming seminars (not everyone has given us a title yet):</i></b></div>
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19-May <b>Graham White</b> (Southampton)</div>
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26-May <b>Job Feldbrugge</b> (Edinburgh) Real-Time Path Integrals, Caustics and Interference in Cosmology</div>
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2-Jun <b>Mariana Carrillo Gonzalez</b> (Imperial/Southampton)<br>
9-Jun <b>Sayyed Farbod Rassouli</b> (Nottingham)</div>
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<b>Finally the full list can be found here:</b></div>
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<a href="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" id="OWA15cbb2c1-f996-254c-6d2a-e32762247837" class="OWAAutoLink" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" data-auth="NotApplicable" data-linkindex="1" style="margin: 0px;">https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx</a></div>
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Please let us know if you would like to chat with the speakers and we will arrange for that. </div>
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Best wishes,</div>
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Ed and Qi-Xin</div>
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