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Can noncommutative effects account for the present speed up of the cosmic expansion?

Octavio Obregon* and Israel Quiros†

  • División de Ciencias e Ingeniería de la Universidad de Guanajuato, A.P. 150, 37150, León, Guanajuato, México

  • *octavio@fisica.ugto.mx
  • †iquiros@fisica.ugto.mx
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Phys. Rev. D 84, 044005 – Published 2 August, 2011

DOI: https://doi.org/10.1103/PhysRevD.84.044005

Abstract

In this paper we investigate to which extent noncommutativity, an intrinsically quantum property, may influence the Friedmann-Robertson-Walker cosmological dynamics at late times/large scales. To our purpose it will be enough to explore the asymptotic properties of the cosmological model in the phase space. Our recipe to build noncommutativity into our model is based in the approach of Ref. [4] and can be summarized in the following steps: i) the Hamiltonian is derived from the Einstein-Hilbert action (plus a self-interacting scalar field action) for a Friedmann-Robertson-Walker space-time with flat spatial sections, ii) canonical quantization recipe is applied, i.e., the mini-superspace variables are promoted to operators, and the WDW equation is written in terms of these variables, iii) noncommutativity in the mini-superspace is achieved through the replacement of the standard product of functions by the Moyal star product in the WDW equation, and, finally, iv) semiclassical cosmological equations are obtained by means of the WKB approximation applied to the (equivalent) modified Hamilton-Jacobi equation. We demonstrate, indeed, that noncommutative effects of the kind considered here can be those responsible for the present speed up of the cosmic expansion.

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Phys. Rev. D 84, 044005– Published 2 August, 2011
  • Received 19 February 2011

© 2011 American Physical Society

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