Covariant Effective Action for Loop Quantum Cosmology from Order Reduction

Details Covariant Effective Action for Loop Quantum Cosmology from Order Reduction Covariant Effective Action for Loop Quantum Cosmology from Order Reduction

2008-11-11

arxiv.org/abs/0811.1799v2

Phys.Rev.D79:044035,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

minor changes to match published version

Scientific paper

10.1103/PhysRevD.79.044035

Loop quantum cosmology (LQC) seems to be predicting modified effective Friedmann equations without extra degrees of freedom. A puzzle arises if one decides to seek for a covariant effective action which would lead to the given Friedmann equation: The Einstein--Hilbert action is the only action that leads to second order field equations and, hence, there exists no covariant action which, under metric variation, leads to modified Friedmann equation without extra degrees of freedom. It is shown that, at least for isotropic models in LQC, this issue is naturally resolved and a covariant effective action can be found if one considers higher order theories of gravity but faithfully follows effective field theory techniques. However, our analysis also raises doubts on whether a covariant description without background structures can be found for anisotropic models.

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