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UID:calendar.959411.field_date.0@bhi.fas.harvard.edu
DTSTAMP:20170526T204024Z
DESCRIPTION:Abhay Ashtekar [1]\nPenn State University\nDynamical horizons i
n Classical and Quantum Gravity\nAbstract:\nWhile event horizons are gener
ally used to distinguish black holes from other \ncompact astrophysical ob
jects in classical general relativity\, this notion \nhas some severe limi
tations. In the classical theory\, they are teleological: \nAn event horiz
on may well be forming in the room you are sitting in\, in \nanticipation
of a gravitational collapse in the center of our galaxy a \nbillion years
from now. For evaporating black holes in the quantum theory\, \nthere are
no event horizons at all. Fortunately one can replace them with \nquasi-lo
cal horizons which are free of these limitations. In this \ndescription\,
a black hole in equilibrium is described by an isolated horizon \nand and
an evolving black hole by a dynamical horizon. What forms in a \ngravitati
onal collapse and evaporates due to Hawking radiation is a dynamical \nhor
izon. I will discuss properties of dynamical horizons in classical and \nq
uantum gravity.\n\nMaximilian Attems [2]\nUniversity of Barcelona\nFast H
ydrodynamization of Non-conformal Holographic Shockwaves\nAbstract:\nEver
since fast hydrodynamization has been observed in heavy ion collisions \nt
he understanding of the early out-of-equilibrium stage of such collisions
\nhas been a topic of intense research. We use the gauge/gravity duality t
o \nmodel the creation of a strongly coupled Quark-Gluon plasma in a \nnon
-conformal gauge theory. This numerical relativity study is the first \nno
n-conformal holographic simulation of a heavy ion collision and reveals th
e \nexistence of new relaxation channels due to the presence of non-vanish
ing \nbulk viscosity. We study collisions at different energies in gauge t
heories \nwith different degrees of non-conformality and compare three rel
axation times \nwhich can occur in different orderings: the hydrodynamizat
ion time (when \nhydrodynamics becomes applicable)\, the EoSization time (
when the average \npressure approaches its equilibrium value) and the cond
ensate relaxation time \n(when the expectation value of a scalar operator
approaches its equilibrium \nvalue). Finally\, I will discuss a new exampl
e of the applicability of \nhydrodynamics to systems with large gradients.
We show that the time \nevolution and saturation of the spinodal instabi
lity (corresponding to black \nbranes afflicted by the Gregory-Laflamme in
stability in the gravity dual) are \naccurately described by second-order
hydrodynamics\, where a set of locally \nunstable states with a first-orde
r thermal phase transition settle down to a \nstatic\, inhomogeneous confi
guration.\n\n\n\n[1] http://cgpg.gravity.psu.edu/people/Ashtekar/\n[2] htt
p://hep.itp.tuwien.ac.at/~mattems/\n
DTSTART;TZID=America/New_York:20170425T133000
DTEND;TZID=America/New_York:20170425T143000
LAST-MODIFIED:20170421T160129Z
LOCATION:BHI Conference Room (211) 20 Garden Street\, Cambridge
SUMMARY:BHI Colloquium: April 25\, 2017 | 'Dynamical horizons in Classical
and Quantum Gravity\,' Abhay Ashtekar | 'Fast Hydrodynamization of Non-con
formal Holographic Shockwaves\,' Maximilian Attems
URL;TYPE=URI:https://bhi.fas.harvard.edu/event/bhi-colloquium-april-25-2017
-abhay-ashtekar
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