82 citations · 287 across the 12 of their papers we have counts for
7 papers · 1 filter
Duality between static spherically or hyperbolically symmetric solutions and cosmological solutions in scalar-tensor gravity
Alexander Yu. Kamenshchik, Ekaterina O. Pozdeeva, Alexei A. Starobinsky +4
We study static spherically and hyperbolically symmetric solutions of the Einstein equations in the presence of a conformally coupled scalar field and compare them with those in th…
Non-Canonical Inflation and Primordial Black Holes Production
Alexander Y. Kamenshchik, Alessandro Tronconi, Tereza Vardanyan +1
We study a mechanism for the amplification of the inflationary scalar perturbation when the inflaton field action is non-canonical, i.e. the inflaton kinetic term has a non-standar…
Exact solutions of the Einstein equations for an infinite slab with a constant energy density
Alexander Yu. Kamenshchik, Tereza Vardanyan
We find exact static solutions of the Einstein equations in the spacetime with plane symmetry, where an infinite slab with finite thickness and homogeneous energy (mass) density is…
Time in quantum theory, the Wheeler-DeWitt equation and the Born-Oppenheimer approximation
Alexander Yu. Kamenshchik, Alessandro Tronconi, Tereza Vardanyan +1
We compare two different approaches to the treatment of the Wheeler-DeWitt equation and the introduction of time in quantum cosmology. One approach is based on the gauge-fixing pro…
Quantum Gravity, Time, Bounces and Matter
A. Y. Kamenshchik, A. Tronconi, T. Vardanyan +1
In the context of Quantum Cosmology and the Wheeler-DeWitt equation we investigate the possible effects of a non semiclassical wave-function of the universe on the evolution of the…
Comment about the vanishing of the vacuum energy in the Wess-Zumino model
Andrei O. Barvinsky, Alexander Yu. Kamenshchik, Tereza Vardanyan
We check the cancellation of the vacuum energy in the Wess-Zumino model at the two-loop order in the component field formalisms with and without auxiliary fields. We show that in b…
Pauli-Zeldovich cancellation of the vacuum energy divergences, auxiliary fields and supersymmetry
A. Yu. Kamenshchik, A. A. Starobinsky, A. Tronconi +2
We have considered the Pauli-Zeldovich mechanism for the cancellation of the ultraviolet divergences in vacuum energy. This mechanism arises because bosons and fermions give contri…