19 citations · 39 across the 6 of their papers we have counts for
6 papers
The affine-null formulation of the gravitational equations: spherical case
J. A. Crespo, H. P. de Oliveira, J. Winicour
A new evolution algorithm for the characteristic initial value problem based upon an affine parameter rather than the areal radial coordinate used in the Bondi-Sachs formulation is…
Aspects of wave turbulence in preheating III: The case of the two-fields models
J. A. Crespo, H. P. de Oliveira
The present work is the continuation of the investigation of aspects of wave turbulence in preheating we have started in Refs. [1, 2] but considering several classes of inflationar…
Aspects of wave turbulence in preheating II: Rebirth of the nonminimal coupled models
J. A. Crespo, H. P. de Oliveira
We study the nonlinear stage of preheating in a model consisting of a single inflaton field nonminimally coupled to the spacetime curvature and considering a self-coupling quar…
A Galerkin-Collocation domain decomposition method: application to the evolution of cylindrical gravitational waves
W. O. Barreto, J. A. Crespo, H. P. de Oliveira +1
We present a Galerkin-Collocation domain decomposition algorithm applied to the evolution of cylindrical unpolarized gravitational waves. We show the effectiveness of the algorithm…
Mass gap in the critical gravitational collapse of a kink
W. Barreto, J. Crespo, H. de Oliveira +2
We study the gravitational collapse of a kink within spherical symmetry and the characteristic formulation of General Relativity. We explore some expected but elusive gravitational…
Aspects of Wave Turbulence in Preheating
José A. Crespo, H. P. de Oliveira
In this work we have studied the nonlinear preheating dynamics of the inflationary model. It is well established that after a linear stage of preheating characte…