3 papers
gr-qc2001
Self-similar collapse of a massless scalar field in three-dimensions
G. Oliveira-Neto
We study an analytical solution to the Einstein's equations in 2+1-dimensions, representing the self-similar collapse of a circularly symmetric, minimally coupled, massless, scalar…
hep-th2000
Non-Abelian BFFT embedding, Schrödinger quantization and the anomaly of the O(N) nonlinear sigma model
E. M. C. Abreu, J. Ananias Neto, W. Oliveira +1
We embed the O(N) nonlinear sigma model in a non-Abelian gauge theory. As a first class system, it is quantized using two different approaches: the functional Schrödinger method an…
gr-qc1993
Did the Pseudo-Sphere Universe have a Beginning?
G. Oliveira-Neto
A calculation of the no-boundary wave-function of the universe is put forward for a spacetime with negative curvature. A semi-classical Robertson-Walker approximation is attempted…