Theoretical aspects in the study of inhomogeneous cosmological models
2003; Mexican Society of Physics; Volume: 49; Issue: 2 Linguagem: Espanhol
ISSN
2683-2224
Autores Tópico(s)Cosmology and Gravitation Theories
ResumoespanolSe desarrolla un formalismo covariante en base a la existencia de un campo vectorial de la cuadrivelocidad, a fin de entender la geometria y las propiedades fisicas de modelos cosmologicos inhomogeneos. Discutimos la cinematica local y las observaciones en la vecindad de observadores fundamentales sobre este campo. El formalismo proporciona una derivacion de los modelos homogeneos estandares de Friedmann-Lemaitre-Robertson-Walker, demandando isotropia local para todos los observadores. Tambien analizamos varios tensores de energia-momento, correspondientes a fluidos termodinamicos y en general a mezclas de fluidos con distintas cuadrivelocidades. EnglishA covariant formalism based on the existence of a 4-velocity vector field is developed in order to understand the geometric and physical properties of inhomogeneous cosmological models. We discuss local kinematics and observations along neighboring fundamental observers comoving along this field. The formalism yields a anice derivation of the standard homogeneous Friedmann-Lemaitre-Robertson-Walker models based on demanding local isotropy for all fundamental observers. We also examine various energy-momentum tensors, corresponding to thermodynamical fluids and to general fluid mixtures with different 4-velocities.
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