43 citations · 76 across the 6 of their papers we have counts for
6 papers
Pure and mixed states
J. C. A. Barata, M. Brum, V. Chabu +1
We present a review on the notion of pure states and mixtures as mathematical concepts that apply for both classical and quantum physical theories, as well as for any other theory…
Wavepackets on de Sitter spacetime
João C. A. Barata, Marcos Brum
We construct wavepackets on de Sitter spacetime, with masses consistently defined from the eigenvalues of an irreducible representation of a Casimir element in the universal envelo…
Explicit construction of Hadamard states for Quantum Field Theory in curved spacetimes
Marcos Brum
In this Thesis we will explicitly construct Hadamard states with different features. In the two first cases, the states will be constructed in static and in cosmological spacetimes…
Hadamard state in Schwarzschild-de Sitter spacetime
Marcos Brum, Sergio E. Jorás
We construct a state in the Schwarzschild-de Sitter spacetime which is invariant under the action of its group of symmetries. Our state is not defined in the whole Kruskal extensio…
"Vacuum-like" Hadamard states for quantum fields on curved spacetimes
Marcos Brum, Klaus Fredenhagen
We present a modification of the recently proposed Sorkin-Johnston states for scalar free quantum fields on a class of globally hyperbolic spacetimes possessing compact Cauchy hype…
States of Low Energy in Homogeneous and Inhomogeneous, Expanding Spacetimes
Kolja Them, Marcos Brum
We construct states on the algebra of the Klein-Gordon field that minimize the energy density in homogeneous and in inhomogeneous spacetimes, both with compact Cauchy hypersurfaces…