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Distant supernova split four ways by gravitational lens（图）
Distant supernova split gravitational lens
2015/3/18
Over the past several decades, astronomers have come to realize that the sky is filled with magnifying glasses that allow the study of very distant and faint objects barely visible with even the large...
Gravitational instability of the primordial plasma: anisotropic evolution of structure seeds
Gravitational instability primordial plasma: anisotropic evolution
2011/10/10
We study how the presence of a background magnetic field, of intensity compatible with current observation constraints, affects the linear evolution of cosmological density perturbations at scales bel...
Light on Dark Matter: Gravitational Lensing by Galaxy Clusters
Dark Matter Gravitational Lensing Galaxy Clusters
2010/10/18
I discuss the use the weak gravitational lensing effect to study the mass distribution and dynamical state of a sample of 24 X-ray luminous clusters of galaxies. By comparing the mass and light distri...
Conserved Gravitational Charges, Locality and the Holographic Weyl Anomaly - a Fresh Viewpoint
Gravitational Charges the Holographic Weyl Anomaly asymptotic isometries
2010/10/18
Since the proposal of the AdS/CFT correspondence, made by Maldacena and Witten, there has been some controversy about the definition of conserved Noether charges associated with asymptotic isometries ...