Influence of plasma collective effects on cosmological evolution
Resource
Modern Physics Letters A, 23(17-20), 1707-1714
Journal
Modern Physics Letters A
Pages
1707-1714
Date Issued
2008
Date
2008
Author(s)
Chen, P. S.
Lai, K. C.
Abstract
It is well-known that the universe was in a plasma state both before decoupling and after reionization. However, the conventional wisdom has been that the plasma effects are largely Debye-shielded and can thus be safely ignored when considering large scale evolutions. Recently we showed that large scale structure formation in the universe may actually be suppressed by the plasma collective effect. Indeed, observational data indicate that the conventional theoretical formula tends to overestimate the matter power spectrum at scales k > 1h Mpc −1 . In this paper, we further develop our theory through a more thorough and general derivation of the Maxwell-Einstein-Boltzmann equation. In addition to baryon density perturbation post reionization, we apply this general formulation to investigate the possible plasma effect on CMB anisotropy. As expected, while the plasma effect does render an observable effect to the former, its impact on the latter is totally negligible.
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