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We show that almost all metric–affine theories of gravity yield Einstein equations with a non–null cosmological constant Λ. Under certain circumstances and for any dimension, it is also possible to incorporate a Weyl vector field Wμ and therefore the presence of an anisotropy. The viability of these field equations is discussed in view of recent… (More)

- Maximiliano Ujevic, Patricio Letelier
- J. Comput. Physics
- 2006

We find a numerical self-consistent stellar model by finding the distribution function of a thin disk that satisfies simultaneously the Fokker-Planck and Poisson equations. The solution of the Fokker-Planck equation is found by a direct numerical solver using finite differences and a variation of Stone’s method. The collision term in the Fokker-Planck… (More)

Tim Dietrich, Sebastiano Bernuzzi, Maximiliano Ujevic, and Bernd Brügmann Theoretical Physics Institute, University of Jena, 07743 Jena, Germany Theoretical Astrophysics, California Institute of Technology, 1200 E. California Boulevard, Pasadena, California 91125, USA DiFeST, University of Parma, and INFN Parma, I-43124 Parma, Italy Centro de Ciências… (More)

The study of potential flows in general relativity is relevant in the understanding of several phenomena of interest in relativistic astrophysics like: fluid flows at relativistic speeds in the presence of a neutron star [1,2], star clusters moving in gaseous media [1], flows near a cosmic string [1], accretion in binary star systems and supermassive black… (More)

One approach in modern cosmology consists in supposing that dark matter and dark energy are different manifestations of a single ‘quartessential’ fluid. Following such idea, this work presents a study of the evolution of perturbations of density in a flat cosmological model with a modified Chaplygin gas acting as a single component. Our goal is to obtain… (More)

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