Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-06-30
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages
Scientific paper
It has been suggested by Chen and Lai that the proper description of the large scale structure formation of the universe in the post-reionization era, which is conventionally characterized via gas hydrodynamics, should include the plasma collective effects in the formulation. Specifically, it is the combined pressure from the baryon thermal motions and the residual long-range electrostatic potentials resulted from the imperfect Debye shielding, that fights against the gravitational collapse. As a result, at small-scales the baryons would oscillate at the ion-acoustic, instead of the conventional neutral acoustic, frequency. In this paper we extend and improve the Chen-Lai formulation with the attention to the Landau damping of the ion-acoustic oscillations. Since T_e \sim T_i in the post-reionization era, the ion acoustic oscillations would inevitably suffer the Landau damping which severely suppresses the baryon density spectrum in the regimes of intermediate and high wavenumber k. To describe this Landau-damping phenomenon more appropriately, we find it necessary to modify the filtering wavenumber k_f in our analysis. It would be interesting if our predicted Landau damping of the ion-acoustic oscillations can be observed at high redshifts.
Chang Feng-Yin
Chen Pisin
No associations
LandOfFree
Landau Damping of Baryon Structure Formation in the Post Reionization Epoch does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Landau Damping of Baryon Structure Formation in the Post Reionization Epoch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Landau Damping of Baryon Structure Formation in the Post Reionization Epoch will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-153536