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SUMMARY:Sumit R. Das (University of Kentucky)
DTSTART;VALUE=DATE-TIME:20200514T143000Z
DTEND;VALUE=DATE-TIME:20200514T153000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/1
DESCRIPTION:Title: Bulk entanglement and holography\nby Sumit R. Das (Univ
ersity of Kentucky) as part of IPM Holography Virtual Seminars\n\n\nAbstra
ct\nWe argue that the entanglement between regions of the target space of
a large $N$ field theory with a smooth holographic dual provides a precis
e meaning to the entanglement of a region in the bulk. We conjecture that
the leading answer for this quantity is $A/4G$\, where $A$ is the area of
the entangling surface and $G$ is Newton's constant. For specially chosen
regions in $D_p$ brane backgrounds\, we provide a precise map to the targe
t space of the dual theory. Our conjecture then leads to the conclusion th
at this target space entanglement entropy should scale like $O(N^2)$ which
is quite plausible in a system with $O(N^2)$ degrees of freedom. Recent n
umerical advances in studying the $D_0$ brane system hold out hope that th
is proposal can be tested in a precise way in the future.\n(Based on Sumit
R. Das\, Anurag Kaushal\, Gautam Mandal and Sandip Trivedi\, arxiv: 2004.
00613)\n\nJoin Zoom Meeting\nhttps://us02web.zoom.us/j/89697900502?pwd=WWZ
aaW4xcWtHd0ExdkNzTHRmR3crZz09\n\nMeeting ID: 896 9790 0502\nPassword: 761
472\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edgar Shaghoulian (Cornell University)
DTSTART;VALUE=DATE-TIME:20200521T123000Z
DTEND;VALUE=DATE-TIME:20200521T133000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/2
DESCRIPTION:Title: Replica wormholes and the black hole information parado
x\nby Edgar Shaghoulian (Cornell University) as part of IPM Holography Vir
tual Seminars\n\n\nAbstract\nWe will analyze the information paradox in tw
o-dimensional models of gravity. In this setting\, we will show that new s
addles in the gravitational path integral imply a unitary Page curve for t
he entropy of Hawking radiation. These saddles arise in the replica method
as wormholes connecting different copies of the black hole. We will focus
on these saddles in anti-de Sitter spacetime\, but if time permits we wil
l also discuss flat and de Sitter spacetimes.\n\nJoin Zoom Meeting\nhttps:
//us02web.zoom.us/j/88665007158?pwd=cG9mODIybFMzaTJxL2FOYi9lc2Nzdz09\n\nMe
eting ID: 886 6500 7158\nPassword: 391304\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Juan F. Pedraza (University College London & Brandeis University)
DTSTART;VALUE=DATE-TIME:20200528T093000Z
DTEND;VALUE=DATE-TIME:20200528T103000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/3
DESCRIPTION:Title: Local quenches\, bulk entanglement entropy and a unitar
y Page curve\nby Juan F. Pedraza (University College London & Brandeis Uni
versity) as part of IPM Holography Virtual Seminars\n\n\nAbstract\nQuantum
corrections to the entanglement entropy of matter fields interacting with
dynamical gravity have proven to be very important in the study of the bl
ack hole information problem. We consider a one-particle excited state of
a massive scalar field infalling in a pure $AdS_3$ geometry and compute th
ese corrections for bulk subregions anchored on the AdS boundary. In the d
ual $CFT_2$\, the state is given by the insertion of a local primary opera
tor and its evolution thereafter. We calculate the area and bulk entanglem
ent entropy corrections at order $\\mathcal{O}(N^0)$\, both in AdS and its
CFT dual. The two calculations match\, thus providing a non-trivial check
of the FLM formula in a dynamical setting. Further\, we observe that the
bulk entanglement entropy follows a Page curve. We explain the precise sen
se in which our setup can be interpreted as a simple model of black hole e
vaporation and comment on the implications for the information problem.\n\
nMeeting ID: 852 4153 8685 Password: 343561\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:James Sully (University of British Columbia)
DTSTART;VALUE=DATE-TIME:20200604T043000Z
DTEND;VALUE=DATE-TIME:20200604T053000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/4
DESCRIPTION:Title: Eigenstate Thermalization and Disorder Averaging in Gra
vity\nby James Sully (University of British Columbia) as part of IPM Holog
raphy Virtual Seminars\n\n\nAbstract\nIt has long been believed that progr
ess in understanding the black hole information paradox would require comi
ng to terms with microscopic details of quantum gravity---something beyond
the reach of semiclassical effective field theory. In that light\, one of
the most surprising discoveries of the last year has been that signature
features of the unitary evaporation of black holes can already be seen wit
hin effective field theory\, albeit with the inclusion of 'euclidean wormh
oles'. However\, these novel contributions are best understood when the gr
avitational theory is not a single microscopic theory\, but an average ove
r many different theories. To save unitarity must we then simultaneously t
hrow it away? I will explain how the same story can be recovered within a
single microscopic theory by thinking carefully about the right effective
theory for finite-lifetime observers.\n\nMeeting ID: 895 9741 7637\nPasswo
rd: 337380\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:S. Prem Kumar (Swansea University)
DTSTART;VALUE=DATE-TIME:20200611T093000Z
DTEND;VALUE=DATE-TIME:20200611T103000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/5
DESCRIPTION:Title: Islands and Page Curves for Evaporating Black Holes\nby
S. Prem Kumar (Swansea University) as part of IPM Holography Virtual Semi
nars\n\n\nAbstract\nI will describe the effect of a shockwave on the entan
glement structure of a black hole within JT gravity. Focusing attention on
an analytically tractable semiclassical description\, we discuss how the
Page time and associated time-dependent quantum extremal surface are affec
ted by the shockwave and subsequent relaxation of the black hole via evapo
ration.\n\nMeeting ID: 898 9692 9849\nPassword: 847891\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nima Afkhami-Jeddi (University of Chicago)
DTSTART;VALUE=DATE-TIME:20200702T040000Z
DTEND;VALUE=DATE-TIME:20200702T050000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/6
DESCRIPTION:Title: 3d gravity from averaging 2d CFTs\nby Nima Afkhami-Jedd
i (University of Chicago) as part of IPM Holography Virtual Seminars\n\n\n
Abstract\nWe study the torus partition functions of free compatic bosonic
CFTs in two dimensions. Integrating over Narain moduli defines an ensemble
-averaged free CFT. We calculate the averaged partition function and show
that it can be reinterpreted as a sum over topologies in three dimensions.
This result leads us to conjecture that an averaged free CFT in two dimen
sions is holographically dual to an exotic theory of three-dimensional gra
vity.\n\nMeeting ID: 812 5763 7854\nPassword: 611391\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jorrit Kruthoff (Stanford University)
DTSTART;VALUE=DATE-TIME:20200723T050000Z
DTEND;VALUE=DATE-TIME:20200723T060000Z
DTSTAMP;VALUE=DATE-TIME:20200812T032244Z
UID:IPMHolographySeminar/7
DESCRIPTION:Title: On the flow of states under $T\\bar{T}$\nby Jorrit Krut
hoff (Stanford University) as part of IPM Holography Virtual Seminars\n\n\
nAbstract\nWe study the $T\\bar{T}$ deformation of two dimensional quantum
field theories from a Hamiltonian point of view\, focusing on aspects of
the theory in Lorentzian signature. Our starting point is a simple rewriti
ng of the spatial integral of the $T\\bar{T}$ operator\, which directly im
plies the deformed energy spectrum of the theory. Using this rewriting\, w
e then derive flow equations for various quantities in the deformed theory
\, such as energy eigenstates\, operators\, and correlation functions. On
the plane\, we find that the deformation merely has the effect of implemen
ting successive canonical/Bogoliubov transformations along the flow. This
leads us to define a class of non-local\, “dressed” operators (includi
ng a dressed stress tensor) which satisfy the same commutation relations a
s in the undeformed theory. This further implies that on the plane\, the d
eformed theory retains its symmetry algebra\, including conformal symmetry
\, if the original theory is a CFT. On the cylinder the $T\\bar{T}$ deform
ation is much more non-trivial\, but even so\, correlation functions of ce
rtain dressed operators are integral transforms of the original ones. Fina
lly\, we propose a tensor network interpretation of our results in the con
text of AdS/CFT.\n\nMeeting ID: 845 5363 7892\nPassword: 713874\n
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