An Approach to the Cosmological Constant Problem(s)

Details An Approach to the Cosmological Constant Problem(s) An Approach to the Cosmological Constant Problem(s)

2004-08-15

arxiv.org/abs/hep-ph/0408169v1

Phys.Lett. B609 (2005) 7-12

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at Rencontres de Moriond, 2004 by G.L. Kane

Scientific paper

10.1016/j.physletb.2004.12.078

We propose an approach to explaining why naive large quantum fluctuations are not the right estimate for the cosmological constant. We argue that the universe is in a superposition of many vacua, in such a way that the resulting fluctuations are suppressed by level repulsion to a very small value. The approach combines several aspects of string theory and the early history of the universe, and is only valid if several assumptions hold true. The approach may also explain why the effective cosmological constant reamins small as the universe evolves though several phase transitions. It provides a non-anthropic mechansim leading to a small, non-zero cosmological constant.

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