2009/09/30 by K. Narayan · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-th
paper · pdf · doi:10.1103/physrevd.81.066005
published as Phys.Rev.D81:066005,2010 · Latex, 24pgs, v3. PRD version, various clarifications on AdS/CFT connections added, references added
arxiv created 2010/03/05 · openalex publication_date 2010/03/26 · arxiv updated 2010/04/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We continue exploring free strings in the background of null Kasner-like cosmological singularities, following K. Narayan, arXiv:0904.4532. We study the free string Schrodinger wave functional along the lines of K. Narayan, arXiv:0807.1517. We find the wave functional 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.