Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-06-11
Phys.Rev.D69:044014,2004
Physics
High Energy Physics
High Energy Physics - Theory
31 pages, 18 figures, Ref.[20] added, minor correction to Fig. 3 made
Scientific paper
10.1103/PhysRevD.69.044014
We revisit the proposal that the resolution of the Cosmological Constant Problem involves a sub-millimeter breakdown of the point-particle approximation for gravitons. No fundamental description of such a breakdown, which simultaneously preserves the point-particle nature of matter particles, is yet known. However, basic aspects of the self-consistency of the idea, such as preservation of the macroscopic Equivalence Principle while satisfying quantum naturalness of the cosmological constant, are addressed in this paper within a Soft Graviton Effective Theory. It builds on Weinberg's analysis of soft graviton couplings and standard heavy particle effective theory, and minimally encompasses the experimental regime of soft gravity coupled to hard matter. A qualitatively distinct signature for short-distance tests of gravity is discussed, bounded by naturalness to appear above approximately 20 microns.
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