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18 papers · 1 filter
Duality invariance in massive theories
Adel Khoudeir, David Sierra
In this work, we show that duality symmetry can be implemented for massive theories at the level of the action, whenever we can formulate appropriates gauge invariant actions. For…
Searching for tidal tails around Centauri using RR Lyrae Stars
J. G. Fernández-Trincado, A. K. Vivas, C. E. Mateu +5
We present a survey for RR Lyrae stars in an area of 50 deg around the globular cluster Centauri, aimed to detect debris material from the alleged progenitor galaxy of the…
Conformally flat polytropes for anisotropic matter
L. Herrera, A. Di Prisco, W. Barreto +1
We analyze in detail conformally flat spherically symmetric fluid distributions, satisfying a polytropic equation of state. Among the two possible families of relativistic polytrop…
On the recovery of galaxy properties from SED fitting solutions
Gladis Magris C., Juan Mateu P., Cecilia Mateu +3
We explore the ability of four different inverse population synthesis codes to recover the physical properties of galaxies from their spectra by SED fitting. Three codes, DynBaS, T…
Cracking isotropic and anisotropic relativistic spheres
Guillermo A. Gonzalez, Anamaria Navarro, Luis A. Nunez
We explore the influence of density fluctuations on isotropic and anisotropic configurations, extending the concept of cracking for general relativistic fluid spheres. This concept…
A polynomial model of purely affine gravity
Oscar Castillo-Felisola, Aureliano Skirzewski
We present a purely affine gravitational model in four dimensions built up entirely on the bases of full diffeomorphism invariance, and power- counting renormalizability. We show t…