Thursday, December 20, 2012

1212.4538 (Jan Govaerts et al.)

Quantum gravity and the cosmological constant: lessons from
two-dimensional dilaton gravity
   [PDF]

Jan Govaerts, Simone Zonetti
In the investigation and resolution of the cosmological constant problem the inclusion of the dynamics of quantum gravity can be a crucial step. In this work we suggest that the quantum constraints in a canonical theory of gravity can provide a way of addressing the issue: we consider the case of two-dimensional quantum dilaton gravity non-minimally coupled to a U(1) gauge field, in the presence of an arbitrary number of massless scalar matter fields, intended also as an effective description of highly symmetrical higher-dimensional models. We are able to quantize the system non-perturbatively and obtain an expression for the cosmological constant \Lambda in terms of the quantum physical states, in a generalization of the usual QFT approach. We discuss the role of the classical and quantum gravitational contributions to \Lambda and present a partial spectrum of values for it.
View original: http://arxiv.org/abs/1212.4538

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