Garchinger Maier-Leibnitz-Kolloquium: Understanding Quark Matter with High-Order Perturbation Theory

by Dr Saga Säppi (Physik Department T30f, TUM)

Thursday 11 Jan 2024, 16:15 → 17:15 Europe/Berlin

Lecture Hall, ground floor (west) (LMU building, Am Coulombwall 1, campus Garching)

The cores of neutron stars are unique in their ability to serve as 'celestial laboratories' of extremely dense matter. Their cores, expected to contain deconfined quark matter, are of particular interest for this talk. With improved observational methods and especially the advent of gravitational wave  astronomy, understanding the properties of such a phase of strongly interacting matter becomes increasingly important. I will outline how this can be achieved from the point of view of perturbative quantum chromodynamics, one of the very few first-principles methods of studying such matter. After a general overview, I will highlight two recent advances in the field. First, a 'subleading logarithmic correction' finally obtained at next-to-next-to-next-to-leading order for the cold and dense pressure by pushing hard thermal loop methods to higher orders. Second, a calculation of the bulk viscosity of neutron stars with perturbation theory, made feasible with a simplified treatment of the effects of finite quark masses, compared with holographic methods and used to obtain a robust prediction for the bulk viscosity of quark matter at intermediate densities.

Hybrid access via ZOOM:
https://lmu-munich.zoom.us/j/98457332925?pwd=TWc3V1JkSHpyOTBPQVlMelhuNnZ1dz09
Meeting ID: 984 5733 2925
Passcode: 979953

 

kolloquium-11-01-24.pdf