Beecroft Institute for Particle Astrophysics and Cosmology

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LeMoMaF: Lensed Mock Map Facility

(2006)

Authors:

Jaime E Forero-Romero, Jeremy Blaizot, Julien Devriendt, Ludovic Van Waerbeke, Bruno Guiderdoni

The cosmological behavior of Bekenstein's modified theory of gravity

(2006)

Authors:

F Bourliot, PG Ferreira, DF Mota, C Skordis

The cosmological behavior of Bekenstein's modified theory of gravity

ArXiv astro-ph/0611255 (2006)

Authors:

F Bourliot, PG Ferreira, DF Mota, C Skordis

Abstract:

We study the background cosmology governed by the Tensor-Vector-Scalar theory of gravity proposed by Bekenstein. We consider a broad family of potentials that lead to modified gravity and calculate the evolution of the field variables both numerically and analytically. We find a range of possible behaviors, from scaling to the late time domination of either the additional gravitational degrees of freedom or the background fluid.

The cosmological history of accretion onto dark halos and supermassive black holes

Astronomy and Astrophysics 459 (2006) 43-54

Authors:

L Miller, Percival, W.J., Croom, S.M., Babic, A.

Cloud Dispersal in Turbulent Flows

ArXiv astro-ph/0610930 (2006)

Authors:

F Heitsch, AD Slyz, JEG Devriendt, A Burkert

Abstract:

Cold clouds embedded in warm media are very common objects in astrophysics. Their disruption timescale depends strongly on the dynamical configuration. We discuss the evolution of an initially homogeneous cold cloud embedded in warm turbulent gas. Within a couple of dynamical timescales, the filling factor of the cold gas within the original cloud radius drops below 50%. Turbulent diffusivities estimated from the time evolution of radial filling factor profiles are not constant with time. Cold and warm gas are bodily transported by turbulence and mixed. This is only mildly indicated by column density maps. The radiation field within the cloud, however, increases by several orders of magnitudes due to the mixing, with possible consequences for cloud chemistry and evolution within a few dynamical timescales.