39 citations · 64 across the 13 of their papers we have counts for
13 papers
Semiclassical partition function for the double-well potential
D. Kroff, A. Bessa, C. A. A. de Carvalho +2
We compute the partition function and specific heat for a quantum mechanical particle under the influence of a quartic double-well potential non-perturbatively, using the semiclass…
Positive Lyapunov exponents for Hamiltonian linear differential systems
Mario Bessa, Paulo Varandas
In the present paper we give a positive answer to some questions posed by Viana on the existence of positive Lyapunov exponents for Hamiltonian linear differential systems. We prov…
Effective potential in the BET formalism
A. Bessa, C. A. A. de Carvalho, E. S. Fraga +1
We calculate the one-loop effective potential at finite temperature for a system of massless scalar fields with quartic interaction in the framework of the boundary effectiv…
Pressure of massless hot scalar theory in the boundary effective theory framework
A. Bessa, F. T. Brandt, C. A. A. de Carvalho +1
We use the boundary effective theory (BET) approach to thermal field theory in order to calculate the pressure of a system of massless scalar fields with quartic interaction. The m…
Quantum statistical correlations in thermal field theories: boundary effective theory
A. Bessa, F. T. Brandt, C. A. A. de Carvalho +1
We show that the one-loop effective action at finite temperature for a scalar field with quartic interaction has the same renormalized expression as at zero temperature if written…
Zero-mode analysis of quantum statistical physics
A. Bessa, C. A. A. de Carvalho, E. S. Fraga
We present a unified formulation for quantum statistical physics based on the representation of the density matrix as a functional integral. We identify the stochastic variable of…