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.
Thermodynamics via Creation from Nothing: Limiting the Cosmological Constant Landscape / A.O. Barvinsky; A.Yu. Kamenshchik. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - STAMPA. - 74:(2006), pp. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
