Null cosmological singularities and free strings

Abstract

We continue exploring free strings in the background of null Kasner-like cosmological singularities, following arXiv:0904.4532 [hep-th]. We study the free string Schrodinger wavefunctional along the lines of arXiv:0807.1517 [hep-th]. We find the wavefunctional to be nonsingular in the vicinity of singularities whose Kasner exponents satisfy certain relations. We compare this with the description in other variables. We then study certain regulated versions of these singularities where the singular region is replaced by a substringy but nonsingular region and study the string spectra in these backgrounds. The string modes can again be solved for exactly, giving some insight into how string oscillator states get excited near the singularity.

Latex, 24pgs, v3. PRD version, various clarifications on AdS/CFT connections added, references added

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Cited by in corpus (6)

• Evidence for the existence of a novel class of supersymmetric black holes with AdS${}_5\times$S${}^5$ asymptotics
• Light-like Big Bang singularities in string and matrix theories
• The string wave function across a Kasner singularity
• Nonequilibrium dynamics of strings in time-dependent plane wave backgrounds
• On the breakdown of the perturbative interaction picture in Big Crunch/Big Bang or the true reason why perturbative string amplitudes on temporal orbifolds diverge
• D3-branes at angle in a linear dilaton pp-wave background