Hamburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

GR: Fachverband Gravitation und Relativitätstheorie

GR 9: Quantum Cosmology

GR 9.3: Vortrag

Donnerstag, 3. März 2016, 09:10–09:30, VMP6 HS A

A perfect bounce in quantum cosmology — •Steffen Gielen¹ and Neil Turok² — ¹Theoretical Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom — ²Perimeter Institute for Theoretical Physics, Waterloo ON N2L 2Y5, Canada

We study the quantum cosmology of a universe with conformal matter comprising a perfect radiation fluid and a number of conformally coupled scalar fields. For FRW backgrounds, we are able to perform the path integral exactly; the evolution describes a "perfect bounce," in which the universe passes smoothly through the singularity. The Feynman path integral amplitude is precisely that of a relativistic oscillator, for which the scale factor of the universe is the time and the scalar fields are the spatial coordinates. We also study the quantum evolution of anisotropies (for a Bianchi I model) and of inhomogeneous perturbations, at linear and nonlinear order, viewed as a "scattering process" between incoming and outgoing asymptotic modes. We provide evidence for a semiclassical description in which all fields pass around the cosmological singularity along regular, complex classical paths.