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Early universe in quantum gravity

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arxiv 2206.06384 v4 pith:FWRM6QJW submitted 2022-06-13 gr-qc astro-ph.COhep-th

Leonardo Modesto , Gianluca Calcagni This is my paper
classification gr-qcastro-ph.COhep-th
keywords phaseweylquantumuniverseearlyevolvesgravityinvariant
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We present a new picture of the early universe in finite nonlocal quantum gravity, which is Weyl invariant at the classical and quantum levels. The high-energy regime of the theory consists of two phases, a Weyl invariant trans-Planckian phase and a post-Planckian or Higgs phase described by an action quadratic in the Ricci tensor and where the cosmos evolves according to the standard radiation-dominated model. In the first phase, all the issues of the hot big bang such as the singularity, flatness, and horizon problems find a universal and simple non-inflationary solution by means of Weyl invariance, regardless of the microscopic details of the theory. In the second phase, once Weyl symmetry is spontaneously broken, primordial perturbations are generated around a background that asymptotically evolves as a radiation-dominated flat Friedmann--Lema\^{i}tre--Robertson--Walker universe.

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Cited by 3 Pith papers

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