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Dear All, </div>
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See below for a Gravity Lab seminar Fri 6 March 11am. </div>
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Best, </div>
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Jorma </div>
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<span style="color: rgb(33, 33, 33);"><b>Seminar</b> <i>/ Mathematical Physics / </i><br>
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<b>Speaker: </b>Diego Pardo Santos (King's College London)<br>
<b>Title: </b>Mass and entropy of asymptotically flat eternal quantum black holes in 2D<br>
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<b>Abstract: </b>Semi-classical dilaton gravity in (1+1)-dimensions remains one of the only arenas where quantum black holes can be exactly constructed, fully accounting for backreaction due to quantum matter. In this talk, I'll provide a comprehensive analysis
of the mass and thermodynamic properties of static asymptotically flat quantum black holes both analytically and numerically. First, I analytically investigate eternal quantum black hole solutions to a one-parameter family of analytically solvable models interpolating
between Russo-Susskind-Thorlacius and Bose, Parker, and Peleg gravities. Examining these models in a semi-classically allowed parameter space, I find naked singularities may exist for quantum fields in the Boulware state. Using a quasi-local formalism, where
we confine the black hole to a finite sized cavity, I derive the conserved energy and analyse the system's thermal behaviour. Specifically, I show the semi-classical Wald entropy precisely equals the generalized entropy, accounting for both gravitational and
fine-grained matter entropies, and we find a range where the quantum black holes are thermally stable. Finally, I numerically construct eternal black hole solutions to semi-classical Callan-Giddings-Harvey-Strominger gravity and find their thermal behaviour
is qualitatively different from their analytic counterparts. In the process, I develop an analytic expansion of the solutions and find it accurately approximates the full numerical solutions in the semi-classical limit. --- Related eprint:
</span><span style="color: rgb(0, 120, 212);"><a style="color: rgb(0, 120, 212);" data-outlook-id="652ff3fa-69de-48b1-a0f5-00b94ce14ade" data-auth="NotApplicable" class="x_ms-outlook-linkify OWAAutoLink" id="OWAff905f90-c301-a14a-8f1b-a32ffcc5a5d8" href="https://arxiv.org/abs/2512.19812">https://arxiv.org/abs/2512.19812</a></span><span style="color: rgb(33, 33, 33);"><br>
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<b>When:</b> Friday, 6 March 2026, 11:00<br>
<b>Where:</b> Physics B17<br>
</span><span style="color: rgb(0, 120, 212);"><a style="color: rgb(0, 120, 212);" data-outlook-id="aeb59767-e85a-4c97-937a-c2bba6f47df7" data-auth="NotApplicable" class="x_ms-outlook-linkify OWAAutoLink" id="OWA7f8f7329-c447-1293-00ff-56eeea8797c6" href="https://teams.microsoft.com/meet/34246569224862?p=LHI4nFADPoZH3atFtR">https://teams.microsoft.com/meet/34246569224862?p=LHI4nFADPoZH3atFtR</a></span><span style="color: rgb(33, 33, 33);"> Meeting
ID: 342 465 692 248 62 Passcode: AM9Bh2Vd<br>
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</span><span style="color: rgb(0, 120, 212);"><b><a style="color: rgb(0, 120, 212);" data-outlook-id="47ce431b-1d49-4b31-8c0f-563399513e53" data-auth="NotApplicable" title="https://outlook.office.com/calendar/deeplink/compose?path=/calendar/action/compose&rru=addevent&subject=Seminar:+Diego Pardo Santos&body=Mass and entropy of asymptotically flat eternal quantum black holes in 2D<br><br>https://teams.microsoft.com/meet/34246569224862?p=LHI4nFADPoZH3atFtR Meeting ID: 342 465 692 248 62 Passcode: AM9Bh2Vd&location=Physics B17&startdt=2026-03-06T11:00:00&enddt=2026-03-06T12:00:00" class="OWAAutoLink" id="OWA74feed62-a61c-7bdb-4916-1186f22e0040" href="https://outlook.office.com/calendar/deeplink/compose?path=/calendar/action/compose&rru=addevent&subject=Seminar:+Diego%20Pardo%20Santos&body=Mass%20and%20entropy%20of%20asymptotically%20flat%20eternal%20quantum%20black%20holes%20in%202D%3Cbr%3E%3Cbr%3Ehttps://teams.microsoft.com/meet/34246569224862?p=LHI4nFADPoZH3atFtR%20Meeting%20ID:%20342%20465%20692%20248%2062%20Passcode:%20AM9Bh2Vd&location=Physics%20B17&startdt=2026-03-06T11:00:00&enddt=2026-03-06T12:00:00">Add
to Calendar</a></b></span></div>
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