A quantum field theory warm inflation model is presented that solves the horizon/flatness problems. The model obtains, from the elementary dynamics of particle physics, cosmological scale factorâ€¦ (More)

The optimized linear Î´-expansion is applied to multi-field O(N1)Ã—O(N2) scalar theories at high temperatures. Using the imaginary time formalism the thermal masses are evaluated perturbatively up toâ€¦ (More)

Physical review. E, Statistical, nonlinear, andâ€¦

2009

Non-Markovian stochastic Langevin-like equations of motion are compared to their corresponding Markovian (local) approximations. The validity of the local approximation for these equations, whenâ€¦ (More)

The role of spin-torsion coupling to gravity is analyzed in the context of a model of chaotic inflation. The system of equations constructed from the Einstein-Cartan and inflaton field equations areâ€¦ (More)

A dissipative mechanism is presented, which emerges in generic interacting quantum field systems and which leads to robust warm inflation. An explicit example is considered, where using typicalâ€¦ (More)

We study the conditions under which an overdamped regime can be attained in the dynamic evolution of a quantum field configuration. Using a âˆ—E-mail: berera@vuhep.phy.vanderbilt.edu â€ E-mail:â€¦ (More)

The optimized linear Î´-expansion is applied to the Î»Ï† theory at high temperature. Using the imaginary time formalism the thermal mass is evaluated perturbatively up to order Î´. A variationalâ€¦ (More)

We apply the Î´-expansion perturbation scheme to the Î»Ï†4 self-interacting scalar field theory in 3+1 D at finite temperature. In the Î´-expansion the interaction term is written as Î»(Ï†2)1+Î´ and Î´ isâ€¦ (More)

Among the various proposed models for implementing inflation, the hybrid inflation model [1] is one of the most attractive ones due to the possibility of its implementation in the context ofâ€¦ (More)