ITMP Seminar "Gravitational Waves from High Temperature Strings"

Dear Colleagues,

We are pleased to announce that the next ITMP seminar will be held on Wednesday, Oct 16, 18:00 (Moscow time). It will be organised via Zoom.

Speaker: Dr. Ratul Mahanta, University of Winnipeg

Title: Gravitational Waves from High Temperature Strings

Abstract: In this talk, I will discuss an epoch where the energy density of the universe is dominated by highly excited (i.e. long) strings in thermal equilibrium (at temperature close to the Hagedorn temperature), with equilibration driven by the joining and splitting of the dominant open string population. I will illustrate Boltzmann equation approach to string thermodynamics to describe such a phase. As a result of graviton emission by long open strings during such an epoch, stochastic Gravitational Wave (GW) background is produced. The GW spectrum peaks at high frequencies of order 50-100 GHz, the same as for gravitational waves from the reheating epoch of the Standard Model. But the amplitude of the string signal is significantly larger than predicted by the Standard Model and its field theoretic extensions.

If you want to join the seminar please register here before 18:00, October 16 here.

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