A Symmetry for the Cosmological Constant

Details A Symmetry for the Cosmological Constant A Symmetry for the Cosmological Constant

2005-05-31

arxiv.org/abs/hep-th/0505265v2

JHEP 0607:042,2006

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 3 figures, References corrected

Scientific paper

10.1088/1126-6708/2006/07/042

We study a symmetry, schematically Energy -> - Energy, which suppresses matter contributions to the cosmological constant. The requisite negative energy fluctuations are identified with a "ghost" copy of the Standard Model. Gravity explicitly, but weakly, violates the symmetry, and naturalness requires General Relativity to break down at short distances with testable consequences. If this breakdown is accompanied by gravitational Lorentz-violation, the decay of flat spacetime by ghost production is acceptably slow. We show that inflation works in our scenario and can lead to the initial conditions required for standard Big Bang cosmology.

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