Discrete Self-Similarity in Ultra-Relativistic Type-II Strong Explosions (2009)
A solution to the ultra-relativistic strong explosion problem with a non-power law density gradient is delineated. We consider a blast wave expanding into a density profile falling off as a steep...
Discrete self-similarity in ultrarelativistic type-II strong explosions (2009)
A solution to the ultrarelativistic strong explosion problem with a nonpower law density gradient is delineated. We consider a blast wave expanding into a density profile falling off as a steep...
Discrete Self-Similarity in Type-II Strong Explosions (2009)
We present new solutions to the strong explosion problem in a non-power law density profile. The unperturbed self-similar solutions discovered by Waxman & Shvarts describe strong Newtonian shocks...
Discrete self-similarity in type-II strong explosions (2009)
We present new solutions to the strong explosion problem in a nonpower law density profile. The unperturbed self-similar solutions discovered by Waxman and Shvarts describe strong Newtonian shocks...
GRB 051221A and Tests of Lorentz Symmetry (2006)
Martinez, Maria Rodriguez, Piran, Tsvi, Oren, Yonatan
Various approaches to quantum gravity suggest the possibility of violation of Lorentz symmetry at very high energies. In these cases we expect a modification at low energies of the dispersion...
On Choptuik's scaling in higher dimensions (2005)
We extend Choptuik's scaling phenomenon found in general relativistic critical gravitational collapse of a massless scalar field to higher dimensions. We find that in the range 4
The apparent size of GRB afterglows as a test of the Fireball model (2004)
Oren, Yonatan, Nakar, Ehud, Piran, Tsvi
Taylor et al. (2004) reported recently on the first direct measurement of the apparent size of a GRB afterglow. Here we confront these observations with the predictions of the fireball model. We use...
Polarization and light curve variability: the "patchy shell" model (2003)
Recent advances in early detection and detailed monitoring of GRB afterglows have revealed variability in some afterglow light curves. One of the leading models for this behavior is the patchy shell...
On the Collapse of Charged Scalar Fields (2003)
We explore numerically the evolution of a collapsing spherical shell of charged, massless scalar field. We obtain an external \RN space-time, and an inner space-time that is bounded by a singularity...