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“Physics of gamma-ray bursts”

Date:

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Time:

Thursday, 14. Sept 2017

Video-Recording for any system with MP4-support

- Video.mp4 (ca.303 Mb)

15:15 – 16:05

Felix Ryde

(KTH)

Abstract :

The largest explosions that we have observed in the Universe are from the so called

gamma-ray bursts (GRBs). They are emitted in connection with the collapse of the

central regions of massive stellar remnants, into either a blackhole or a magnetar, and

a subsequent development of an ultra-relativistic jetted outflow. Since GRBs typically

occur at very large distances they have great potential for cosmology and the study

of the first generation stars.

However, the necessary basic understanding of the processes leading to the observed

gamma-ray emission is still incomplete. I will present the development of the current

paradigm which includes emission from the region in which the relativistic jet becomes

optically thin, the photosphere. In particular, I will review recent developments in our

understanding of the properties of a relativistic photosphere and the diagnostic tools

that are emerging from this study.

The future colloquium program can be found at: