Date:
Sun, 12/06/201112:30-13:30
Location:
seminar room
Title: Gamma-Ray Burst without Baryon Load?
Abstract:
Gamma-Ray Bursts (GRBs) are the most luminous objects in the universe. It remains a big challenge to reveal how most of the energy can be converted into gamma-rays with highly nonthermal spectra. We suggest that a confinement of the jet could be a key to this long-standing problem, by showing that, contrary to common belief, internal shocks can arise in an accelerating radiation-dominated jet if it is confined even weakly to a converging opening angle. The
central engine allows less fine-tuned baryon load than previously thought, even pure-leptonic unmagnetized outflows. We also discuss other topics including Population III GRBs at high redshift (when time allows).
Abstract:
Gamma-Ray Bursts (GRBs) are the most luminous objects in the universe. It remains a big challenge to reveal how most of the energy can be converted into gamma-rays with highly nonthermal spectra. We suggest that a confinement of the jet could be a key to this long-standing problem, by showing that, contrary to common belief, internal shocks can arise in an accelerating radiation-dominated jet if it is confined even weakly to a converging opening angle. The
central engine allows less fine-tuned baryon load than previously thought, even pure-leptonic unmagnetized outflows. We also discuss other topics including Population III GRBs at high redshift (when time allows).