2024-03-28T23:39:26Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/245382016-02-16T07:23:11Zcom_10261_135com_10261_4col_10261_388
Covariant effective action for loop quantum cosmology à la Palatini
Olmo, Gonzalo J.
Singh, Parampreet
Quantum gravity phenomenology
Cosmological perturbation theory
Physics of the early universe
5 pags. ; 1 fig.
In loop quantum cosmology, non-perturbative quantum gravity effects lead to the resolution of the big bang singularity by a quantum bounce without introducing any new degrees of freedom. Though fundamentally discrete, the theory admits a continuum description in terms of an effective Hamiltonian. Here we provide an algorithm to obtain the corresponding effective action, establishing in this way the covariance of the theory for the first time. This result provides new insights on the continuum properties of the discrete structure of quantum geometry and opens new avenues to extract physical predictions such as those related to gauge invariant cosmological perturbations.
We are grateful to A. Ashtekar, A. Corichi and B. Dittrich for useful discussions and extensive comments. We thank F. Barbero, R. Maartens, G. Mena-Marug´an and K. Vandersloot for comments. PS also thanks T. Biswas and K. Vandersloot for discussions on metric formulation of the problem. GO has been supported by MICINN. Research of PS is supported by Perimeter Institute for
Theoretical Physics. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Research & Innovation.
Peer reviewed
2010-05-20T11:12:36Z
2010-05-20T11:12:36Z
2009-01-15
artículo
http://purl.org/coar/resource_type/c_6501
Journal of cosmology and astroparticle physics, 0901: 030 (2009)
1475-7516
http://hdl.handle.net/10261/24538
10.1088/1475-7516/2009/01/030
en
http://dx.doi.org/10.1088/1475-7516/2009/01/030
open
127970 bytes
application/pdf
Institute of Physics Publishing