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SUMMARY:Evolution of singularities in unequal time two-point correlator in
formation of QGP
DTSTART;VALUE=DATE-TIME:20120817T203000Z
DTEND;VALUE=DATE-TIME:20120817T205000Z
DTSTAMP;VALUE=DATE-TIME:20200926T000942Z
UID:indico-contribution-308680@indico.cern.ch
DESCRIPTION:Speakers: Shu Lin ()\nOne of the most difficult problems still
to be understood is the mechanism of fast thermalization in heavy ion col
lisions. The problem involves dynamics in strong coupling regime and physi
cs far from equilibrium\, therefore is hardly tractable by usual method. T
he gauge/gravity duality naturally maps the formation of quark gluon plasm
a to another fundamental problem in black hole physics: information loss i
n a gravitational collapse process. The present work summarizes our recent
results on the study of a particular probe: unequal time two-point correl
ator for gauge theory in the evolution toward thermal equilibrium. In [1]\
, we found that near equilibrium the spectral functions showed a universal
pattern as field equilibrates in a quasi-static approximation. We have th
en systematically extended the previous work to the far from equilibrium r
egion by using the coordinate representation. In the past two years we hav
e developed a divergence matching method in computing the singularities of
the unequal time two-point correlator in a time-dependent background. We
found the singularities have a nice interpretation with a geometric optics
picture [2\,3]. Applying this method to the gravitational collapse model\
, we found the singularities of the unequal time correlator shifted from t
he real time to the complex time in the formation of QGP [4]. This signatu
re sheds more light on the mechanism of the thermalization and may have in
teresting implications to heavy ion phenomenology and experiments.\n\n[1]
S.~Lin and E.~Shuryak\,\n %``Toward the AdS/CFT Gravity Dual for High Ene
rgy Collisions. 3. Gravitationally Collapsing Shell and Quasiequilibrium\,
''\n Phys.\\ Rev.\\ D {\\bf 78}\, 125018 (2008)\n [arXiv:0808.0910 [hep-
th]].\n\n[2] J.~Erdmenger\, S.~Lin and T.~H.~Ngo\,\n %``A Moving mirror i
n AdS space as a toy model for holographic thermalization\,''\n JHEP {\\b
f 1104}\, 035 (2011)\n [arXiv:1101.5505 [hep-th]].\n\n[3] J.~Erdmenger\,
C.~Hoyos and S.~Lin\,\n %``Time Singularities of Correlators from Dirichl
et Conditions in AdS/CFT\,''\n JHEP {\\bf 1203}\, 085 (2012)\n [arXiv:11
12.1963 [hep-th]].\n\n[4] J.~Erdmenger and S.~Lin\, to appear\n\nhttps://i
ndico.cern.ch/event/181055/contributions/308680/
LOCATION: Empire
URL:https://indico.cern.ch/event/181055/contributions/308680/
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