Naturalness of exponential cosmon potentials and the cosmological constant problem

Details Naturalness of exponential cosmon potentials and the cosmological constant problem Naturalness of exponential cosmon potentials and the cosmological constant problem

2008-01-21

arxiv.org/abs/0801.3208v1

Phys.Rev.D77:103505,2008

Physics

High Energy Physics

High Energy Physics - Theory

19 pages

Scientific paper

10.1103/PhysRevD.77.103505

We discuss the naturalness of exponential potentials for quintessence, showing that the resulting almost flat direction in the space of scalar fields, as well as the small time dependent cosmon mass, can be related to an anomalous dilatation symmetry. We argue that the physics of the cosmological constant is Planck scale physics, and comment on the role of quantum fluctuations. We present three higher dimensional scenarios how a runaway of the ``cosmological constant'' to zero can be combined with stable particle physics properties, leading at most to small variations of the ``fundamental couplings''.

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