Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-09-02
JCAP 1009:027,2010
Physics
High Energy Physics
High Energy Physics - Theory
7 pages, REVTeX 4, 1 figure, accepted for publication in JCAP; v2: one reference added and various cosmetic (but no physics) c
Scientific paper
10.1088/1475-7516/2010/09/027
We investigate the effects of Quantum Gravity on the Planck era of the universe. In particular, using different versions of the Generalized Uncertainty Principle and under specific conditions we find that the main Planck quantities such as the Planck time, length, mass and energy become larger by a factor of order 10-10^{4} compared to those quantities which result from the Heisenberg Uncertainty Principle. However, we prove that the dimensionless entropy enclosed in the cosmological horizon at the Planck time remains unchanged. These results, though preliminary, indicate that we should anticipate modifications in the set-up of cosmology since changes in the Planck era will be inherited even to the late universe through the framework of Quantum Gravity (or Quantum Field Theory) which utilizes the Planck scale as a fundamental one. More importantly, these corrections will not affect the entropic content of the universe at the Planck time which is a crucial element for one of the basic principles of Quantum Gravity named Holographic Principle.
Basilakos Spyros
Das Saurya
Vagenas Elias C.
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