Null cosmological singularities and free strings

Details Null cosmological singularities and free strings Null cosmological singularities and free strings

2009-09-25

arxiv.org/abs/0909.4731v3

Phys.Rev.D81:066005,2010

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

10.1103/PhysRevD.81.066005

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.

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