This page was upgraded 05 January 2000

 

RESEARCH ARTICLES.

 

Papers in preparation and/or recently submitted:

If you wish to write a comment and/or receive the LaTeX code of these papers send me a request to sussman@nuclecu.unam.mx
Relaxation versus collison times in the radiative era. Comparison between macroscopic and microscopic timescales of interaction between matter and radiation in the radiative era. Co-author: Diego Pavon. To be submitted soon to Physics Review D.
 Generalized Lemaitre-Tolman-Bondi solutions.  New exact solutions with LTB metric whose source is an imperfect fluid. This fluid can be used to model matter-radiation interaction with shera viscosity or a non-interactive mixture of CDM and radiation. Dynamical and geometric features studied. Complements previous work on these solutions. Will be submitted soon to an astrophysical or astronomical journal. Co-author: Josep Triginer
 Spherical collapse in an expanding universe. [In preparation]  Application of previous paper to the case when a spherical region collapses. We provide the conditions for having a collapse of a gallactic mass in the temperature range predicted by CDM collapsing scenarios. Co-author: Josep Triginer.
 Qualitative study of matter-radiation interaction on Kantowski-Sachs universes. [In preparation].  Using a Kantowski-Sachs background with a viscous fluid source, we compare relaxation time and the timescale of Thomson scattering. We discuss wheter the Steffan-Boltzmann expression for radiation and the "truncated" transport equation provide the correct decoupling temperature. Co-authors: Alan Coley and Antonio Sarmiento.
 Qualitative study of inflationary solutions whose potential is motivated by quadratic supergarvity. [In preparation]  Qualitative analisis of FLRW solutions with a minimaly coupled scalar field with a polinomial potential motivated by quadratic supergravity. We aim at testing the global stability of the solutions. Co-authors: Gabriel German and Ricardo Mansilla

Published and accepted papers:

  1. Towards a physical interpretation for the "Stephani Universes".
    To appear in General Relativity and Gravitation, (2000). [click gr-qc/9908019]
  2. Exact inhomogeneous cosmologies whose source is a radiation-matter mixture with consistent thermodynamics.
    Physics Review D,  60, 104023, (1999). Co-author with Diego Pavon. [click gr-qc/9907010]
  3. Exact solutions of Einstein's equations with ideal gas sources.
    Classical and Quantum Gravity, 16 167-87, (1999). Co-author with Josep Triginer. [click gr-qc/9810027]
  4. Ideal gas sources for the Lemaitre-Tolman-Bondi metrics, Classical and Quantum Gravity, 15, 1759-66, (1998). [click gr-qc/9710069]
  5. On the thermodynamical interpretation of perfect fluid solutions of Einstein equations with no symmetry, Journal of Mathematical Physics, 38, 1478-90, (1997). Co-author with H. Quevedo and A. Krasinski.
  6. On the thermodynamics of simple non-isentropic perfect fluids in General Relativity, Classical and Quantum Gravity, 12, 859-74, (1995). Co-author with H. Quevedo. [click gr-qc/9411022]
  7. The thermodynamics of the Stephani Universes, Journal of Mathematical Physics., 36, 1365-77, (1995). Co-author with H. Quevedo. [click gr-qc/9411021]
  8. On spherically symmetric solutions admitting a spacelike conformal motion, Classical and Quantum Gravity, 11, 3081-3, (1994). Co-author with K. Lake.
  9. Bulk Viscosity and Matter Creation in Inhomogeneous Cosmologies with a Shear-free Fluid source, Classical and Quantum Gravity, 11, 1445-51, (1994).
  10. New Solutions for Heat Conducting Fluids with a Normal and Shear-free Flow, Classical and Quantum Gravity, 10, 2675-90, (1993).
  11. Two-fluid models of cosmological inhomogeneities, Classical and Quantum Gravity, 9, 1881-1915, (1992).
  12. Spherically symmetric solutions admitting a spacelike self-similar motion, Journal of Mathematical Physics, 32, 223-231, (1991).
  13. Radial conformal Killing vectors in spherically symmetric, shear-free, perfect fluid spacetimes, General Relativity and Gravitation, 21, 1281-1298, (1989).
  14. Comment on a cosmological solution to Einstein's equations withuniform density and non-uniform pressure. Physical Review D, 40, 1364-1367, (1989).
  15. On spherically symmetric shear-free perfect fluid configurations (charged and neutral) III, Journal of Mathematical Physics, 29, 1177-1211, (1988).
  16. On spherically symmetric shear-free perfect fluid configurations (charged and neutral) II, Journal of Mathematical Physics, 29, 945-970, (1988).
  17. On spherically symmetric shear-free perfect fluid configurations (charged and neutral) I, Journal of Mathematical Physics, 28, 1118-1136, (1987).
  18. Conformal structure of a Schwarzschild black hole immersed in a Friedmann universe. General Relativity and Gravitation, 17, 251-291, (1985).
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