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SUMMARY:VII Tuscan Meeting on Theoretical Physics
DTSTART;VALUE=DATE-TIME:20161004T090000Z
DTEND;VALUE=DATE-TIME:20161004T150000Z
DTSTAMP;VALUE=DATE-TIME:20200603T231925Z
UID:indico-event-12003@agenda.infn.it
DESCRIPTION:11:00 - Glenn Barnich (ULB\, Brussels)\nTitle: Finite BMS tra
nsformations\nAbstract: After a review of holographic features of general
relativity in 3 and 4 dimensions\, I will show how to derive the transform
ation laws of the Bondi mass and angular momentum aspects under finite sup
ertranslations\, superrotations and complex Weyl rescalings.\n12:00 Lunch
break\n14:30 - Paul Townsend (DAMPT\, Cambridge)\nTitle: Worldline time-re
versal and a CPT anomaly\nAbstract: The action for a massless particle in
4D Minkowski spacetime has a worldline time-reversing symmetry correspondi
ng to CPT invariance of the quantum theory. The analogous symmetry of the
N-extended superparticle is anomalous when N is odd\; in the supertwistor
formalism this is seen as a 1D analog of the 3D Parity anomaly. This resul
t accords with the fact that there are no CPT self-conjugate massless N=1
supermultiplet. There is one when N is even\, and it has 2**N states when
N/2 is even but 2**(N+1) when N/2 is odd. From the perspective of worldlin
e time-reversal invariance\, this state doubling for odd N/2 is due to a K
ramers degeneracy.\n15:30 Coffee break\n16:00 - Massimo Porrati (NYU\, Ne
w York))\nTitle: Shaving off Black Hole Soft Hair\nAbstract: After recalli
ng the definition of black hole "hair" we explain why the only interesting
hair are those that are also remnants. Next\, we will examine a recent pr
oposal by Hawking\, Perry and Strominger\, who suggest that soft photons a
nd gravitons can be regarded as black hole hair that may be relevant to th
e black hole information paradox. We will make use of factorization theore
ms for infrared divergences of the S-matrix to argue that\, by appropriate
ly dressing in and out hard states\, the soft-quanta-dependent part of the
S-matrix becomes essentially trivial\, in the sense that the information
paradox can be fully formulated in terms of dressed hard states\, which do
not depend on soft quanta.\n\n\n\nhttps://agenda.infn.it/event/12003/
LOCATION:Scuola Normale Superiore Aula Bianchi
URL:https://agenda.infn.it/event/12003/
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