28 citations
5 papers
Polytropic Stars in covariant formulation
J. C. N de Araujo, H. G. M. Fortes
General Relativity (GR) is not the only way gravity can be geometrised. Instead of curvature, the Teleparallel Theory attributes gravity to torsion , which is related to the ant…
The Moon, a disk or a sphere?
E. Seperuelo Duarte, A. T. Mota, J. R. de Carvalho +2
In this paper, we present a physical modeling activity whose objective is to allow students to determine the differences between a disk and a sphere using pure scientific criteria.…
Formal neighborhoods in arc spaces
Peter Petrov
The theorem of Greenberg-Kazhdan-Drinfeld describes the formal neighborhood of a closed arc. After giving a complete proof with examples, two possible versions for the relative cas…
Dynamical invariants and nonadiabatic geometric phases in open quantum systems
M. S. Sarandy, E. I. Duzzioni, M. H. Y. Moussa
We introduce an operational framework to analyze non-adiabatic Abelian and non-Abelian, cyclic and non-cyclic, geometric phases in open quantum systems. In order to remove the adia…
Entanglement Entropy in Random Quantum Spin-S Chains
A. Saguia, M. S. Sarandy, B. Boechat +1
We discuss the scaling of entanglement entropy in the random singlet phase (RSP) of disordered quantum magnetic chains of general spin-S. Through an analysis of the general structu…