Speaker
Dr
Liu Hui
(Jinan University)
Description
With the dielectric function obtained from AdS/CFT
correspondence, we investigate the strong-coupling wake
potentials induced by the fast-moving charged particles
with velocities v=0.55c and v=0.99c, respectively,
and compare them with those in the weak-coupling case.
We find that for v= 0.99c, the remarkable oscillation
akin to Cherenkov-like radiation and the Mach cone in the
weak-coupling wake potential does not appear in the
strong-coupling wake potential, which may indicate that
the phase velocity of the strong-coupling plasmon mode
will not be lower than the speed of light. Besides this
prominent difference, the wake potentials in strong and
weak coupling are qualitatively similar except for some
detailed discrepancies. For example, when v= 0.55c, the
strong-coupling wake potential shows a deeper negative
minimum in the backward direction than that in the weakcoupling
wake potential, the depths and positions of the
negative minimum for strong- and weak-coupling wake
potentials display opposite variation tendencies with the
increase of particle velocity, and the wake potential in
strong coupling is less sensitive to the particle velocity than
the weak-coupling wake potential.
Summary
With the dielectric function computed from the AdS/CFT correspondence, we studied the wake
potential induced by a fast moving charge in a strong-coupling plasma and compared it with the weak-coupling wake potential for different particle velocities as v= 0.55c and v=0.99c. The most prominent difference between strong and weak wake potential is that, when v=0.99c, the remarkable oscillation due to Cerenkov-like radiation and the Mach cone in weak coupling disappears in strong coupling, which implies that the plasmon mode with phase velocity lower than the speed of light dose not exist in thestrong-coupling plasma.
Primary author
Dr
Liu Hui
(Jinan University)
