Big Crunch/big Bang String Cosmologies

Details Big Crunch/big Bang String Cosmologies Big Crunch/big Bang String Cosmologies

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004lbeh.conf..138c&link_type=abstract

THE LAUNCHING OF LA BELLE EPOQUE OF HIGH ENERGY PHYSICS AND COSMOLOGY A Festschrift for Paul Frampton in His 60th Year and Memor

Physics

High Energy Physics

Scientific paper

We study Big Crunch/Big Bang cosmologies that correspond to exact worldsheet superconformal field theories of type II strings. Generically, the Big Crunch fluctuation spectrum is altered when passing through the bounce singularity. The change in the spectrum is characterized by a function which is momentum and time-dependent. We compute this function explicitly and show that it indicates "entanglement entropy" with spacelike separated regions in the geometry. We demonstrate that in the Milne vacuum limit the fluctuation spectrum is unaltered as it passes through the singularity.

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