2024-03-29T00:18:21Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/245382016-02-16T07:23:11Zcom_10261_135com_10261_4col_10261_388
Olmo, Gonzalo J.
Singh, Parampreet
2010-05-20T11:12:36Z
2010-05-20T11:12:36Z
2009-01-15
Journal of cosmology and astroparticle physics, 0901: 030 (2009)
1475-7516
http://hdl.handle.net/10261/24538
10.1088/1475-7516/2009/01/030
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.
eng
openAccess
Quantum gravity phenomenology
Cosmological perturbation theory
Physics of the early universe
Covariant effective action for loop quantum cosmology à la Palatini
artículo