7 papers · 1 filter
Energetics of neutrinos in neutron stars
Ken Kiers, Michel H. G. Tytgat
I review our proof that long range forces induced by the exchange of massless neutrino-antineutrino pairs do not affect the stability of neutron stars.
Hard thermal loops effective action for piO -> gamma gamma
Robert D. Pisarski, T. L. Trueman, Michel H. G. Tytgat
I consider the low temperature correction to the anomalous coupling of a neutral pion to two photons from an effective Lagrangian point of view.
Parity odd bubbles in hot QCD
D. Kharzeev, R. D. Pisarski, M. H. G. Tytgat
We consider the topological susceptibility for an SU(N) gauge theory in the limit of a large number of colors, . At nonzero temperature, the behavior of the topologic…
pi_0 --> gamma gamma and the axial anomaly at non zero temperature
Robert D. Pisarski, Michel Tytgat
In vacuum, in the chiral limit the coupling of a pion to two on-shell photons is directly related to the coefficient of the axial anomaly in QED. This relationship is lost at any n…
On the Physics of a Cool Pion Gas
Robert D. Pisarski, Michel Tytgat
At finite temperature, the Nambu-Goldstone bosons of a spontaneously broken chiral symmetry travel at a velocity . This effect first appears at order in an expans…
Cool Pions move at less than the speed of light
Robert D. Pisarski, Michel Tytgat
At nonzero temperature, pions propagate through a thermal medium at less than the speed of light. About low temperature, this effect begins not at , but at next to leadin…