69 research outputs found
Second Order Corrections to QED Coupling at Low Temperature
We calculate the second order corrections to vacuum polarization tensor of
photons at low temperatures, i.e; T K (). The thermal
contributions to the QED coupling constant are evaluated at temperatures below
the electron mass that is . Renormalization of QED at these
temperatures has explicitly been checked. The electromagnetic properties of
such a thermal medium are modified. Parameters like electric permittivity and
magnetic permeability of such a medium are no more constant and become
functions of temperature.Comment: 8 latex pages and 1 figure (to appear in IJMP
Two Loop Low Temperature Corrections to Electron Self Energy
We recalculate the two loop corrections in the background heat bath using
real time formalism. The procedure of the integrations of loop momenta with
dependence on finite temperature before the momenta without it, has been
followed. We determine the mass and wavefunction renormalization constants in
the low temperature limit of QED, for the first time with this preferred order
of integrations. The correction to electron mass and spinors in this limit is
important in the early universe at the time of primordial nucleosynthesis as
well as in astrophysics.Comment: 8 pages and 1 figure to appear in Chinese Physics
Search for a Signal on QCD Critical Point in Central Nucleus-Nucleus Collisions
We discuss that the QCD critical point could appear in central collisions in
percolation cluster. We suggest using the nuclear transparency effect and the
one of the light nuclear production to identify the critical point.Comment: To appear in the proceedings of the 20th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions (QM2008), Jaipur, India,
February 4-10, 200
- …