Finite temperature effects on baryon transport scattering in the early Universe
نویسندگان
چکیده
We have computed finite temperature corrections to the electron-hadron scattering cross sections. These are based upon the renormalized electron mass and the modified density of states due to the presence of a background thermal bath. It is found that the electron-hadron thermal transport scattering cross section can be much larger than the zero temperature one. In the case of electronneutron transport scattering, we find σne(T )/σne(T = 0) ' 5 at T ' 0.1MeV .
منابع مشابه
Polarization-temperature Correlations in the Microwave Background
The polarization of the CMB ooers a potentially valuable probe of the physics of the early universe, speciically of the velocity of the photon-baryon uid on the last scattering surface. Here we discuss qualitatively the correlations that arise between the temperature anisotropies and polarization of the CMB and how they might be observed .
متن کامل1 99 8 CERN - TH / 98 - 116 hep - ph / 9804237 THERMODYNAMICS OF NON - TOPOLOGICAL SOLITONS
In theories with low energy supersymmetry breaking, the effective potential for squarks and sleptons has generically nearly flat directions, V (φ) ∼ M 4 (log(φ/M)) n. This guarantees the existence of stable non-topological solitons, Q-balls, that carry large baryon number, B ≫ (M/m p) 4 , where m p is the proton mass. We study the behaviour of these objects in a high temperature plasma. We show...
متن کامل2002 Electroweak Baryon Number Violation
The conditions for baryogenesis in the early universe are well-known (cf. Refs. [1, 2]): 1. C and CP violation, 2. thermal nonequilibrium, 3. violation of baryon number conservation. How realistic are these requirements? Well, noninvariance under the charge conjugation transformation (C) and the combined charge conjugation and parity reflection transformation (CP) have been observed in the labo...
متن کاملFinite-Size Constraints on Nucleation of Hadrons in a Quark-Gluon Plasma
Finite-size scaling has achieved an immense success in the study of equilibrium critical phenomena. On the other hand, systematic studies of finite size effects in the case of metastable decays and other nonequilibrium processes are rare [1, 2]. In this paper, we discuss finite size effects on the dynamics of homogeneous nucleation in a first-order temperature-driven transition (For more detail...
متن کاملCosmological and astrophysical aspects of finite-density QCD
In the early universe, at high temperatures and almost vanishing chemical potential, we expect from asymptotic freedom that quarks and gluons are deconfined in a quark-gluon plasma (QGP). As the universe cools by expansion, a transition to the confined phase, a hadron gas (HG), occurs at T⋆ ∼ ΛQCD. Lattice QCD at vanishing chemical potential provides important insight into the nature of the cos...
متن کامل