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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 W µ 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

A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model the date of receipt and acceptance should be inserted later Abstract 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… (More)

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)

- M. Ujevic, P. S. Letelier
- 2008

The stability of a recently proposed general relativistic model of galaxies is studied in some detail. This model is a general relativistic version of the well known Miyamoto-Nagai model that represents well a thick galactic disk. The stability of the disk is investigated under a general first order perturbation keeping the spacetime metric frozen (no… (More)

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