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Quantum Cosmology and the Evolution of Inflationary Spectra
Alexander Y. Kamenshchik, Alessandro Tronconi, Giovanni Venturi
We illustrate how it is possible to calculate the quantum gravitational effects on the spectra of primordial scalar/tensor perturbations starting from the canonical, Wheeler-De Wit…
Integrable cosmological models in the Einstein and in the Jordan frames and Bianchi-I cosmology
A. Yu. Kamenshchik, E. O. Pozdeeva, A. Tronconi +2
We study integrable models in the Bianchi I metric case with scalar fields minimally and non-minimally coupled with gravity and the correspondence between their general solutions.…
Hořava-Lifshitz gravity inspired Bianchi-II cosmology and the mixmaster universe
Leonardo Giani, Alexander Yu. Kamenshchik
We study different aspects of the Hořava-Lifshitz inspired Bianchi-II cosmology and its relations with the mixmaster universe model. First, we present exact solutions for a toy mod…
Vacuum energy, Standard Model physics and the Diphoton Excess at the LHC
Alexander Y. Kamenshchik, Alexei A. Starobinsky, Alessandro Tronconi +2
The conditions for the cancellation of one loop contributions to vacuum energy (both U.V. divergent and finite) coming from the known (Standard Model) fields and the field associat…
General solutions of integrable cosmological models with non-minimal coupling
A. Yu. Kamenshchik, E. O. Pozdeeva, A. Tronconi +2
We study the integrable model with minimally and non-minimally coupled scalar fields and the correspondence of their general solutions. Using the model with a minimally coupled sca…
Transformations between Jordan and Einstein frames: Bounces, antigravity, and crossing singularities
Alexander Yu. Kamenshchik, Ekaterina O. Pozdeeva, Sergey Yu. Vernov +2
We study the relation between the Jordan-Einstein frame transition and the possible description of the crossing of singularities in flat Friedmann universes, using the fact that th…