Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-05-10
Int.J.Mod.Phys.A22:1797-1818,2007
Physics
High Energy Physics
High Energy Physics - Theory
19 pages, LaTeX; v.2: references added
Scientific paper
10.1142/S0217751X07036336
The cosmological constant problem is turned around to argue for a new foundational physics postulate underlying a consistent quantum theory of gravity and matter, such as string theory. This postulate is a quantum equivalence principle which demands a consistent gauging of the geometric structure of canonical quantum theory. We argue that string theory can be formulated to accommodate such a principle, and that in such a theory the observed cosmological constant is a fluctuation about a zero value. This fluctuation arises from an uncertainty relation involving the cosmological constant and the effective volume of spacetime. The measured, small vacuum energy is dynamically tied to the large size of the universe, thus violating naive decoupling between small and large scales. The numerical value is related to the scale of cosmological supersymmetry breaking, supersymmetry being needed for a non-perturbative stability of local Minkowski spacetime regions in the classical regime.
Jejjala Vishnu
Minic Djordje
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