636 citations
- Centro Brasileiro de Pesquisas FísicasBR71 papers
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6 papers · 2 filters
Entropy of Quantum States: Ambiguities
A. P. Balachandran, A. R. de Queiroz, S. Vaidya
The von Neumann entropy of a generic quantum state is not unique unless the state can be uniquely decomposed as a sum of extremal or pure states. As pointed out to us by Sorkin, th…
On Noncommutative Effects in Entropic Gravity
C. M. Gregory, A. Pinzul
We analyze the question of possible quantum corrections in the entropic scenario of emergent gravity. Using a fuzzy sphere as a natural quasiclassical approximation for the spheric…
The r-matrix of the Alday-Arutyunov-Frolov model
A. Melikyan, G. Weber
We investigate the classical integrability of the Alday-Arutyunov-Frolov model, and show that the Lax connection can be reduced to a simpler 2 x 2 representation. Based on this res…
Spontaneous Breaking of Lorentz Symmetry and Vertex Operators for Vortices
A. P. Balachandran, Seckin Kurkcuoglu, Amilcar R. de Queiroz
We first review the spontaneous Lorentz symmetry breaking in the presence of massless gauge fields and infraparticles. This result was obtained long time ago in the context of rigo…
Renormalization of Noncommutative Quantum Field Theories
Amilcar R. de Queiroz, Rahul Srivastava, Sachindeo Vaidya
We report on a comprehensive analysis of the renormalization of noncommutative ϕ^4 scalar field theories on the Groenewold-Moyal (GM) plane. These scalar field theories are twisted…
Phase transition in the massive Gross-Neveu model in toroidal topologies
F. C. Khanna, A. P. C. Malbouisson, J. M. C. Malbouisson +1
We use methods of quantum field theory in toroidal topologies to study the -component -dimensional massive Gross-Neveu model, at zero and finite temperature, with compactifie…