S-parameter at Non-Zero Temperature and Chemical Potential

Ulrik Ishøj Søndergaard, Francesco Sannino, Claudio Pica

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review


We compute the finite-temperature and matter density corrections to the S-parameter at the one loop level. At non-zero temperature T and matter density Lorentz symmetry breaks and therefore we suggest a suitable generalization of the S-parameter. By computing the plasma correction, we discover a reduction of the S-parameter in the physically relevant region of small external momenta for any non-zero chemical potential and T. In particular, the S-parameter vanishes at small m/T, where m is the mass of the fermions, due to the finite extent of the temporal direction. Our results are directly applicable to the determination of the S-parameter via first principle lattice simulations performed with anti-periodic boundary conditions in the temporal direction.
TidsskriftPhysical Review D
Udgave nummer7
Sider (fra-til)075022
Antal sider9
StatusUdgivet - 2011


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