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Zoekresultaten

Zoekopdracht: faculteit: "FNWI" en publicatiejaar: "2004"

AuteursB.E.L. Craps, B.A. Ovrut
TitelGlobal fluctuation spectra in big crunch/big bang string vacua
TijdschriftPhysical Review D
Jaargang69
Jaar2004
Pagina's66001-
ISSN05562821
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Institute for Theoretical Physics (ITF)
Trefwoorden-
SamenvattingWe study big-crunch–big-bang cosmologies that correspond to exact world-sheet superconformal field theories of type II strings. The string theory spacetime contains a big crunch and a big bang cosmology, as well as additional "whisker" asymptotic and intermediate regions. Within the context of free string theory, we compute, unambiguously, the scalar fluctuation spectrum in all regions of spacetime. Generically, the big crunch fluctuation spectrum is altered while passing through the bounce singularity. The change in the spectrum is characterized by a function Delta, which is momentum and time dependent. We compute Delta explicitly and demonstrate that it arises from the whisker regions. The whiskers are also shown to lead to "entanglement" entropy in the big bang region. Finally, in the Milne orbifold limit of our superconformal vacua, we show that Delta-->1 and, hence, the fluctuation spectrum is unaltered by the big-crunch–big-bang singularity. We comment on, but do not attempt to resolve, subtleties related to gravitational back reaction and light winding modes when interactions are taken into account.
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