Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-08-07
Phys.Rev. D69 (2004) 066001
Physics
High Energy Physics
High Energy Physics - Theory
68 pages, 1 figure; typos corrected
Scientific paper
10.1103/PhysRevD.69.066001
We 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 $\Delta\to 1$ 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 backreaction and light winding modes when interactions are taken into account.
Craps Ben
Ovrut Burt A.
No associations
LandOfFree
Global Fluctuation Spectra in Big Crunch/Big Bang String Vacua does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Global Fluctuation Spectra in Big Crunch/Big Bang String Vacua, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global Fluctuation Spectra in Big Crunch/Big Bang String Vacua will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-616560