223 citations · 638 across the 13 of their papers we have counts for
5 papers · 1 filter
The apparent size of GRB afterglows as a test of the Fireball model
Yonatan Oren, Ehud Nakar, Tsvi Piran
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 fire…
GRB 990123 revisited: Further Evidence for a Reverse Shock
Ehud Nakar, Tsvi Piran
Recently we have presented a new theoretical analysis of the reverse shock emission. We use this analysis here to revisit GRB 990123. We find new and compelling evidences that the…
Survival probabilities in time-dependent random walks
Ehud Nakar, Shahar Hod
We analyze the dynamics of random walks in which the jumping probabilities are periodic {\it time-dependent} functions. In particular, we determine the survival probability of bias…
Early Afterglow Emission from a Reverse Shock as a Diagnostic Tool for GRB Outflows
Ehud Nakar, Tsvi Piran
The Gamma-Ray burst (GRB) - afterglow transition is one of the most interesting and least studied GRB phases. During this phase the relativistic ejecta begins interacting with the…
Evolutionary Minority Game: The Roles of Response Time and Mutation Threshold
Shahar Hod, Ehud Nakar
In the evolutionary minority game, agents are allowed to evolve their strategies (``mutate'') based on past experience. We explore the dependence of the system's global behavior on…