The creation of a quantum Universe is described by a {em density matrix} which yields an ensemble of universes with the cosmological constant limited to a bounded range. The upper cutoff results from the quantum effects of vacuum energy and the conformal anomaly mediated by a special ghost-avoidance renormalization. The cutoff establishes a new quantum scale -- the accumulation point of an infinite sequence of garland-type instantons. The dependence of the cosmological constant range on particle phenomenology suggests a possible dynamical selection mechanism for the landscape of string vacua.

A.O. Barvinsky, A.Yu. Kamenshchik (2006). Thermodynamics via Creation from Nothing: Limiting the Cosmological Constant Landscape. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 74, 121502-121502 [10.1103/PhysRevD.74.121502].

Thermodynamics via Creation from Nothing: Limiting the Cosmological Constant Landscape

KAMENCHTCHIK, ALEXANDR
2006

Abstract

The creation of a quantum Universe is described by a {em density matrix} which yields an ensemble of universes with the cosmological constant limited to a bounded range. The upper cutoff results from the quantum effects of vacuum energy and the conformal anomaly mediated by a special ghost-avoidance renormalization. The cutoff establishes a new quantum scale -- the accumulation point of an infinite sequence of garland-type instantons. The dependence of the cosmological constant range on particle phenomenology suggests a possible dynamical selection mechanism for the landscape of string vacua.
2006
A.O. Barvinsky, A.Yu. Kamenshchik (2006). Thermodynamics via Creation from Nothing: Limiting the Cosmological Constant Landscape. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 74, 121502-121502 [10.1103/PhysRevD.74.121502].
A.O. Barvinsky; A.Yu. Kamenshchik
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/34501
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