During the semester we have a high energy seminar and a lunch seminar. In addition to these two seminars we participate in a joint theoretical high energy theory seminar in Newe Shalom. The joint seminar takes place on Tuesdays from 10:30 until 13:30 and includes two talks and lunch. This seminar is attended by the high energy groups of all the Israeli institutions and usually attracts a crowd of roughly twenty participants.
Gravitational waves from ultra-relativistic collisions: zero-frequency limit and beyond
I will summarize recent work on the spectrum of gravitational waves emitted in transplanckian-energy collisions at leading order in the deflection angle.
A classical and a quantum calculation give identical results and show the emergence of a characteristic break in the spectrum at a frequency which anti-scales with the energy of the collision just like the associated Hawking temperature would do. I will also compare the results to those expected from soft-graviton theorems at sub and sub-sub leading order pointing at some yet unresolved puzzles.