100 citations · 273 across the 13 of their papers we have counts for
10 papers · 1 filter
Density matrix of the Universe reloaded: origin of inflation and cosmological acceleration
A. O. Barvinsky, C. Deffayet, A. Yu. Kamenshchik
We present an overview of a recently suggested new model of quantum initial conditions for the Universe in the form of a cosmological density matrix. This density matrix originally…
Vacuum Energy and Standard Model Physics
G. L. Alberghi, A. Y. Kamenshchik, A. Tronconi +2
The conditions for the cancellation of one loop contributions to vacuum energy (both U.V. divergent and finite) coming from the Standard Model (SM) fields are examined. It is prove…
Cosmological Unparticle Correlators
G. L. Alberghi, A. Yu. Kamenshchik, A. Tronconi +2
We introduce and study an extension of the correlator of unparticle matter operators in a cosmological environment. Starting from FRW spaces we specialize to a de Sitter spacetime…
Conservation laws and scattering for de Sitter classical particles
S. Cacciatori, V. Gorini, A. Kamenshchik +1
Starting from an intrinsic geometric characterization of de Sitter timelike and lightlike geodesics we give a new description of the conserved quantities associated with classical…
Vacuum energy and spectral function sum rules
A. Y. Kamenshchik, A. Tronconi, G. P. Vacca +1
We reformulate the problem of the cancellation of the ultraviolet divergencies of the vacuum energy, particularly important at the cosmological level, in terms of a saturation of s…
A New Spectral Cancellation in Quantum Gravity
Giampiero Esposito, Guglielmo Fucci, Alexander Yu. Kamenshchik +1
A general method exists for studying Abelian and non-Abelian gauge theories, as well as Euclidean quantum gravity, at one-loop level on manifolds with boundary. In the latter case,…