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26 papers · 2 filters
Quantum Gravity Partition Functions in Three Dimensions
Alexander Maloney, Edward Witten
We consider pure three-dimensional quantum gravity with a negative cosmological constant. The sum of known contributions to the partition function from classical geometries can be…
Entropy Fluctuations in Brane Inflation Models
Robert H. Brandenberger, Andrew R. Frey, Larissa C. Lorenz
We study the development of entropy fluctuations in brane inflation in a warped throat, including the brane-antibrane tachyon as the waterfall field. We find that there is a period…
On Perturbations of Quintom Bounce
Yi-Fu Cai, Taotao Qiu, Robert Brandenberger +2
A Quintom universe with an equation-of-state crossing the cosmological constant boundary can provide a bouncing solution dubbed the Quintom Bounce and thus resolve the Big Bang sin…
Lensing and CMB Anisotropies by Cosmic Strings at a Junction
Robert Brandenberger, Hassan Firouzjahi, Johanna Karouby
The metric around straight arbitrarily-oriented cosmic strings forming a stationary junction is obtained at the linearized level. It is shown that the geometry is flat. The sum rul…
Energy Radiation by Cosmic Superstrings in Brane Inflation
Hassan Firouzjahi
The dominant method of energy loss by a loop of cosmic D-strings in models of warped brane inflation is studied. It is shown that the energy loss via Ramond-Ramond field radiation…
Exact Wave Solutions to 6D Gauged Chiral Supergravity
Andrew J. Tolley, C. P. Burgess, Claudia de Rham +1
We describe a broad class of time-dependent exact wave solutions to 6D gauged chiral supergravity with two compact dimensions. These 6D solutions are nontrivial warped generalizati…