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125 papers · 1 filter
The variation of the electromagnetic coupling and quintessence
M. C. Bento, R. Gonzalez Felipe
The properties of quintessence are examined through the study of the variation of the electromagnetic coupling. We consider two simple quintessence models with a modified exponenti…
Stability window and mass-radius relation for magnetized strange quark stars
R. Gonzalez Felipe, A. Perez Martinez
The stability of magnetized strange quark matter (MSQM) is investigated within the phenomenological MIT bag model, taking into account the variation of the relevant input parameter…
Images IV: Strong evolution of the oxygen abundance in gaseous phases of intermediate mass galaxies since z=0.8
M. Rodrigues, F. Hammer, H. Flores +22
Intermediate mass galaxies (logM(Msun)>10) at z~0.6 are the likeliest progenitors of the present-day numerous population of spirals. There is growing evidence that they have evolve…
Near-IR Search for Lensed Supernovae Behind Galaxy Clusters - II. First Detection and Future Prospects
A. Goobar, K. Paech, V. Stanishev +11
Powerful gravitational telescopes in the form of massive galaxy clusters can be used to enhance the light collecting power over a limited field of view by about an order of magnitu…
Constraints on CDM cosmology from galaxy power spectrum, CMB and SNIa evolution
L. D. Ferramacho, A. Blanchard, Y. Zolnierowski
We examine the constraints that can be obtained on standard cold dark matter models from the most currently used data set: CMB anisotropies, type Ia supernovae and the SDSS luminou…
Observation of the suppression of the flux of cosmic rays above 4x10^19eV
The Pierre Auger Collaboration
The energy spectrum of cosmic rays above 2.5x10^18eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the flux, J ~ E…