Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-03-09
Int.J.Mod.Phys.A22:1213-1238,2007
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, 17 figs, v4: consequences of a modification of the evolution equation for the effectice coupling implemented, no qua
Scientific paper
10.1142/S0217751X07035227
We compute the one-loop polarization tensor $\Pi$ for the on-shell, massless mode in a thermalized SU(2) Yang-Mills theory being in its deconfining phase. Postulating that SU(2)$_{\tiny{CMB}}\stackrel{\tiny{today}}=U(1)_Y$, we discuss $\Pi$'s effect on the low-momentum part of the black-body spectrum at temperatures $\sim 2... 4$ $T_{\tiny{CMB}}$ where $T_{\tiny{CMB}}\sim 2.73 $K. A table-top experiment is proposed to test the above postulate. As an application, we point out a possible connection with the stability of dilute, cold, and old innergalactic atomic hydrogen clouds. We also compute the two-loop correction to the pressure arising from the instantaneous massless mode in unitary-Coulomb gauge, which formerly was neglected, and present improved estimates for subdominant corrections.
Giacosa Francesco
Hofmann Ralf
Schwarz Markus
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