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13 papers · 1 filter
Loop Quantum Cosmology and Boundary Proposals
Martin Bojowald, Kevin Vandersloot
For many years, the most active area of quantum cosmology has been the issue of choosing boundary conditions for the wave function of a universe. Recently, loop quantum cosmology,…
Twistors, CFT and Holography
Kirill Krasnov
According to one of many equivalent definitions of twistors a (null) twistor is a null geodesic in Minkowski spacetime. Null geodesics can intersect at points (events). The idea of…
Quantum suppression of the generic chaotic behavior close to cosmological singularities
Martin Bojowald, Ghanashyam Date
In classical general relativity, the generic approach to the initial singularity is very complicated as exemplified by the chaos of the Bianchi IX model which displays the generic…
Quantum Gravity and the Big Bang
Martin Bojowald
Quantum gravity has matured over the last decade to a theory which can tell in a precise and explicit way how cosmological singularities of general relativity are removed. A branch…
On the Uniqueness of Plane-wave String Field Theory
A. Pankiewicz, B. Stefanski
We prove that the two interaction Hamiltonians of light-cone closed superstring field theory in the plane-wave background present in the literature are identical.
Linear perturbations of spatially locally homogeneous spacetimes
Masayuki Tanimoto
Methods and properties regarding the linear perturbations are discussed for some spatially closed (vacuum) solutions of Einstein's equation. The main focus is on two kinds of spati…