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<span style="font-size: 12pt; color: black;">Dear All,</span></p>
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<span style="font-size: 12pt; color: black;"> We have a seminar this week, whose details are provided below - </span></p>
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<span style="font-size: 12pt; color: black;"> </span></p>
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<span style="font-family: Aptos, sans-serif; color: black;"><b>Speaker: Sayyed Farbod Rassouli
</b>(Nottingham)</span></p>
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<span style="font-size: 12pt; color: black;"><b>Seminar date:</b> <b>9th Jun, Tuesday, 1 pm
</b>UK time</span></p>
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<span style="font-size: 12pt; color: black;"><b>Venue:</b> <b>C12</b> <b>(Physics Building)</b></span></p>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 12pt; color: black;">Title: </span></h3>
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Volume as Time: Boundary Dynamics Near Black Hole Horizons</h3>
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<b>Abstract:</b></div>
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Different notions of time arise from different choices of observer. In cosmological settings, a particularly natural choice is the spacetime volume, which is conjugate to the cosmological constant. This gives rise to unimodular time, deparametrizing the Wheeler–DeWitt
equation into a Schrödinger-like evolution equation. I will first explain how this construction appears in arbitrary dimension, with particular emphasis on the four-dimensional case.</div>
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As an explicit Holographic realisation, I will then focus on near-extremal black holes, whose low-energy throat dynamics is universally described by Jackiw–Teitelboim gravity. In this setting, promoting the vacuum cosmological constant to a dynamical top-form
degree of freedom provides a bulk clock in the Henneaux–Teitelboim sense. Holographically, this modifies the usual Schwarzian boundary dynamics by coupling it to an additional U(1) phase mode, reproducing the universal low-energy structure familiar from complex
SYK. Finally, I will show that the resulting boundary theory can be rewritten as a (0+1) dimensional observer action, making explicit the relation between the bulk volume clock and its holographic boundary counterpart.</div>
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<span style="font-size: 12pt; color: black;">--------------------------------------------------</span></p>
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<span style="font-size: 12pt; color: black;"><b>Link to join:</b></span></p>
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<span style="font-size: 12pt; color: black;"> </span><span style="font-size: 12pt; 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" target="_blank" id="OWA35340e34-0fb9-c5d8-47b7-7f2e74d007df" 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" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="color: rgb(5, 99, 193); margin: 0px;">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></span></p>
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<span style="font-size: 12pt; color: black;"> </span></p>
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<span style="font-size: 12pt; color: black;"><b><i>List of the following upcoming seminars:</i></b></span></p>
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<span style="font-size: 12pt; color: black;">16-Jun <b>Carlos Garcia-Garcia</b> (Waterloo,Canada) The status of single scalar field dark energy</span></p>
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<span style="font-size: 12pt; color: black;"><b>Finally the full list can be found here:</b></span></p>
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<span style="font-size: 12pt; color: black;"><a href="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" target="_blank" id="OWAb1a5750b-cb3d-ae01-f516-535a42a1f522" class="OWAAutoLink" title="https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="1" style="margin: 0px;">https://www.nottingham.ac.uk/physics/research/particle-cosmology/seminars/seminars.aspx</a></span></p>
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<span style="font-size: 12pt; color: black;">Please let us know if you would like to chat with the speaker and we will arrange for that. </span></p>
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<span style="font-size: 12pt; color: black;">Best wishes,</span></p>
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<span style="font-size: 12pt; color: black;">Ed and Qi-Xin</span></p>
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