25 citations · 60 across the 6 of their papers we have counts for
6 papers
The Universe as a driven quantum system: Unbounded heating in cyclic cosmologies
J. P. P. Vieira
The Hamiltonian of an evolving Universe is shown to be formally equivalent to that of a driven quantum system, whose driving follows from the temporal dependence of the spacetime m…
Quadratic Models for Engineered Control of Open Quantum Systems
J. P. P. Vieira, A. Lazarides, T. Ala-Nissila
We introduce a framework to model the evolution of a class of open quantum systems whose environments periodically undergo an instantaneous non-unitary evolution stage. For the spe…
Can power spectrum observations rule out slow-roll inflation?
J. P. P. Vieira, Christian T. Byrnes, Antony Lewis
The spectral index of scalar perturbations is an important observable that allows us to learn about inflationary physics. In particular, a detection of a significant deviation from…
Models for Small-Scale Structure on Cosmic Strings: II. Scaling and its stability
J. P. P. Vieira, C. J. A. P. Martins, E. P. S. Shellard
We make use of the formalism described in a previous paper [Martins {\it et al.} Phys. Rev. D90 (2014) 043518] to address general features of wiggly cosmic string evolution. In par…
Models for Small-Scale Structure on Cosmic Strings: I. Mathematical Formalism
C. J. A. P. Martins, E. P. S. Shellard, J. P. P. Vieira
We describe the formalism of a quantitative analytic model for the evolution of realistic wiggly (as opposed to Goto-Nambu) cosmic strings. The model is particularly suited for des…
A stellar test of the physics of unification
J. P. P. Vieira, C. J. A. P. Martins, M. J. P. F. G. Monteiro
We discuss the feasibility of using solar-type main-sequence stars as probes of fundamental physics and unification. We use a simple polytropic stellar structure model and study it…