SFU Cosmology Seminars

For seminars and other local announcements, please subscribe to sfu-cosmo mailing list.

Tuesday, 15 November 2011, 14:00 in P8445B

Archisman Ghosh (University of Kentucky)

Cosmological singularities and AdS/CFT

Singularities in general relativity are expected to be cured by a quantum theory of gravity. String theory is a prospective candidate for quantum gravity and holographic correspondences like AdS/CFT that arise from string theory might shed some light into the nature of singularities. These correspondences map a theory of gravity to a dual non-gravitational field theory in a lower number of dimensions. While the theory of gravity might not be tractable near the singularity, the corresponding field theory might be well-behaved. We come up with a model of cosmology where curvatures become large at some time, thus resembling a big crunch, but whose field theory dual remains well-behaved. Our analysis in the field theory indicates that we have a bouncing cosmology with a thermal distribution of radiation and a possible formation of a small black hole after the bounce.

Seminars in 2011:

2011-09-15 14:00 in P8445B - Tanmay Vachaspati (Arizona State University): Primordial magnetic fields from the electroweak epoch
2011-10-18 14:00 in P8445B - Yin-Zhe Ma (UBC): Cosmology on large and small cosmic scales
2011-10-21 15:30 in AQ3149 - Andrei Frolov (SFU): Staring at the sky (physics colloquium)
2011-10-25 14:00 in P8445B - Ali Narimani (UBC): Dimensionless cosmology
2011-11-01 14:00 in P8445B - Andrei Frolov (SFU): Critical collapse and solitons in classical conformal field theory
2011-11-15 14:00 in P8445B - Archisman Ghosh (University of Kentucky): Cosmological singularities and AdS/CFT
2011-11-22 14:00 in P8445B - Jun-Qi Guo (SFU): Scalar wave propagation in Schwarzschild metric in some usual coordinates
2011-11-25 14:30 in AQ3149 - Levon Pogosian (SFU): Lambda, w and beyond (physics colloquium)
2011-11-29 14:00 in P8445B - Daniel Thomas (Imperial College): Making gravity count: Cluster numbers and other cosmological observables in model independent modified gravity
2012-01-17 14:00 in P8445B - Levon Pogosian (SFU): Fables of reconstruction: controlling bias in the dark energy equation of state
2012-02-07 14:00 in P8445B - Scott Dodelson (Fermilab): Gravitational lensing
2012-02-23 14:00 in P8445B - Jonathan Thornburg (Indiana University): Modelling extreme mass ratio binary black hole inspirals for eLISA
2012-03-08 14:00 in P8445B - Jarah Evslin (IHEP, Beijing): Galaxy-sized monopoles as dark matter?

[ See complete seminar archives | iCal feed ]

Modified by Andrei Frolov <frolov@sfu.ca> on 2025-03-17