312 citations · 701 across the 14 of their papers we have counts for
11 papers · 1 filter
Applicability of the Linear delta Expansion for the lambda phi^4 Field Theory at Finite Temperature in the Symmetric and Broken Phases
R. L. S. Farias, G. Krein, R. O. Ramos
The thermodynamics of a scalar field with a quartic interaction is studied within the linear delta expansion (LDE) method. Using the imaginary-time formalism the free energy is eva…
Warm Inflation and its Microphysical Basis
Arjun Berera, Ian G. Moss, Rudnei O. Ramos
The microscopic quantum field theory origins of warm inflation dynamics are reviewed. The warm inflation scenario is first described along with its results, predictions and compari…
Local Approximations for Effective Scalar Field Equations of Motion
Arjun Berera, Ian G. Moss, Rudnei O. Ramos
Fluctuation and dissipation dynamics is examined at all temperature ranges for the general case of a background time evolving scalar field coupled to heavy intermediate quantum fie…
Updating the Phase Diagram of the Gross-Neveu Model in 2+1 Dimensions
Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos +1
The method of optimized perturbation theory (OPT) is used to study the phase diagram of the massless Gross-Neveu model in 2+1 dimensions. In the temperature and chemical potential…
Incorporating Memory Effects in Phase Separation Processes
T. Koide, G. Krein, Rudnei O. Ramos
We consider the modification of the Cahn-Hilliard equation when a time delay process through a memory function is taken into account. We then study the process of spinodal decompos…
Dynamics of Interacting Scalar Fields in Expanding Space-Time
Arjun Berera, Rudnei O. Ramos
The effective equation of motion is derived for a scalar field interacting with other fields in a Friedman-Robertson-Walker background space-time. The dissipative behavior reflecte…