Wednesday weekly meeting

Wednesday 1 Jun 2022, 11:00 → 12:00 Asia/Tehran

Gholamhossein Haghighat (IPM)

General weekly meeting of the school of particles and accelerators

Meeting room link: https://meet.google.com/wdr-eyjs-wik

1 Meson Excitation Time as a Probe of Holographic Critical Point

We study the time evolution of the expectation value of the Wilson loop as a non-local observable in a strongly coupled field theory with a critical point at finite temperature and nonzero chemical potential, which is dual to an asymptotically AdS charged black hole via gauge/gravity duality. After injection of energy into the plasma, we can define meson excitation time $t_{ex}$ as a time at which the meson falls into the final excited state. We investigate the behavior of $t_{ex}$ near the critical point as the system evolves towards the critical point. We obtain for slow quenches different values of the dynamical critical exponent, although for fast quenches our result for the dynamical critical exponent is in agreement with the one that is reported for studying the quasi-normal modes. Consequently, this indicates that in this model for fast quenches and small values of interquark distances the gauge-invariant Wilson loop is a good non-local observable to probe the critical point.

Speaker: Dr Ali Hajilou (School of particles and accelerators, IPM)

Ali Hajilou, IPM, 14 Dec, IPMHS.pdf