Triangle Seminars
Wednesday, 26 Jun 2019
The entropy of bulk quantum fields and the entanglement wedge of an evaporating black hole
Henry Maxfield
(UCSB)
Abstract:
Semiclassical gravity is famously in tension with the unitary evolution of quantum mechanics when black holes evaporate. I'll describe a semiclassical calculation that nonetheless reproduces signatures of unitarity, namely the "Page curve" of entropy and the Hayden-Preskill protocol. This involves finding a quantum extremal surface, an extremum of the generalised entropy (the area in Planck units plus the entropy of exterior matter), which in the context of an evaporating black hole can exist far from a classical extremal surface. The calculations are performed in an exactly solvable model of Jackiw-Teitelboim gravity coupled to conformal matter. I will conclude by commenting and speculating on the implications for the information paradox.
Semiclassical gravity is famously in tension with the unitary evolution of quantum mechanics when black holes evaporate. I'll describe a semiclassical calculation that nonetheless reproduces signatures of unitarity, namely the "Page curve" of entropy and the Hayden-Preskill protocol. This involves finding a quantum extremal surface, an extremum of the generalised entropy (the area in Planck units plus the entropy of exterior matter), which in the context of an evaporating black hole can exist far from a classical extremal surface. The calculations are performed in an exactly solvable model of Jackiw-Teitelboim gravity coupled to conformal matter. I will conclude by commenting and speculating on the implications for the information paradox.
Posted by: IC
Thursday, 27 Jun 2019
Defects in topological and conformal field theory
📍 London
Two day meeting Thursday and Friday
(For speakers, see the website)
Abstract:
This is a two day meeting, please see <a href="https://www.nms.kcl.ac.uk/gerard.watts/Def19/index.html">the website</a>
for details.
<a href="https://www.nms.kcl.ac.uk/gerard.watts/Def19/index.html">www.tinyurl.com/kcldef19</a>
Registration is required as King's has a new policy on attendance.
Supported by the LMS and the IoP
This is a two day meeting, please see <a href="https://www.nms.kcl.ac.uk/gerard.watts/Def19/index.html">the website</a>
for details.
<a href="https://www.nms.kcl.ac.uk/gerard.watts/Def19/index.html">www.tinyurl.com/kcldef19</a>
Registration is required as King's has a new policy on attendance.
Supported by the LMS and the IoP
Posted by: KCL
Description:
This is a two-day meeting on Defects in topological and conformal field theory, starting on Thursday at 13:00 and ending on Friday c. 16:00.
Please note that registration is required as King's has a new policy on seminar attendance and that unregistered people may find it difficult to get in.
This is a two-day meeting on Defects in topological and conformal field theory, starting on Thursday at 13:00 and ending on Friday c. 16:00.
Please note that registration is required as King's has a new policy on seminar attendance and that unregistered people may find it difficult to get in.
Posted by: Gerard Watts