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- Humberto Vega
- 1995

We present a unified approach to the Thermodynamic Bethe Ansatz (TBA) for magnetic chains and field theories that includes the finite size (and zero temperature) calculations for lattice BA models.â€¦ (More)

Progress on string theory in curved spacetimes since 1992 are reviewed. After a short introduction on strings in Minkowski and curved spacetimes, we focus on strings in cosmological spacetimes. Theâ€¦ (More)

The fractal structure of the universe: a new field theory approach, H. Abstract While the universe becomes more and more homogeneous at large scales, statistical analysis of galaxy catalogs haveâ€¦ (More)

The self-gravitating thermal gas (non-relativistic particles of mass m at temperature T ) is exactly equivalent to a field theory with a single scalar field Ï†(x) and exponential self-interaction. Weâ€¦ (More)

We show that the self-gravitating gas at thermal equilibrium has an infinite volume limit in the three ensembles (GCE, CE, MCE) when (N, V ) â†’ âˆž, keeping N/V 1/3 fixed, that is, with Î· â‰¡ GmN V 1/3 Tâ€¦ (More)

- Humberto Vega
- 1997

The NLIE (the non-linear integral equation equivalent to the Bethe Ansatz equations for finite size) is generalized to excited states, that is states with holes and complex roots over theâ€¦ (More)

Boundary K-matrices for the six vertex and the n(2n âˆ’ 1) A nâˆ’1 vertex models Abstract Boundary conditions compatible with integrability are obtained for two dimensional models by solving theâ€¦ (More)

- Daniel Boyanovsky, Humberto Vega, Robert Holman, J. F. J. Salgado
- 1996

D. Boyanovsky, H.J. de Vega, R. Holman and J. F. J. Salgado (a) Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA. 15260, U.S.A. (b) LPTHE, âˆ— UniversitÃ© Pierre et Marieâ€¦ (More)

- Humberto Vega, Nieves Corzo Sanchez, FranÃ§oise Combes
- Nature
- 1996

THE gas clouds of the interstellar medium have a fractal structure, the origin of which has generally been thought to lie in turbulence1,2. The energy of turbulence could come from galactic rotationâ€¦ (More)

- Daniel Boyanovsky, M. Dâ€™Attanasio, Humberto Vega, R. A. Holman
- 1995

We consider the case of a scalar field, the inflaton, coupled to both lighter scalars and fermions, and the study the relaxation of the inflaton via particle production in both the linear andâ€¦ (More)