Turning Big Bang into Big Bounce: I. Classical Dynamics

Details Turning Big Bang into Big Bounce: I. Classical Dynamics Turning Big Bang into Big Bounce: I. Classical Dynamics

2009-07-20

arxiv.org/abs/0907.3436v3

Phys.Rev.D80:104001,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 1 figure, version accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.80.104001

The big bounce (BB) transition within a flat Friedmann-Robertson-Walker model is analyzed in the setting of loop geometry underlying the loop cosmology. We solve the constraint of the theory at the classical level to identify physical phase space and find the Lie algebra of the Dirac observables. We express energy density of matter and geometrical functions in terms of the observables. It is the modification of classical theory by the loop geometry that is responsible for BB. The classical energy scale specific to BB depends on a parameter that should be fixed either by cosmological data or determined theoretically at quantum level, otherwise the energy scale stays unknown.

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