1 / 14

Weekly Report 08.28 R97222004 蔡偉駿

Weekly Report 08.28 R97222004 蔡偉駿. This Week. Discussing with Feng -Ying about code. Read Dodelson’s book Ch.7 Read Pisin’s Paper “Plasma Suppression of Large Scale Structure Formation in the Universe”, and I’ll report it briefly. Pisin’s Plasma Paper Outline.

pepper
Télécharger la présentation

Weekly Report 08.28 R97222004 蔡偉駿

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Weekly Report 08.28R97222004蔡偉駿

  2. This Week Discussing with Feng-Ying about code. Read Dodelson’s book Ch.7 Read Pisin’s Paper “Plasma Suppression of Large Scale Structure Formation in the Universe”, and I’ll report it briefly.

  3. Pisin’s Plasma Paper Outline • Introduction • Plasma effect • Evolution of baryon perturbation • Matter power spectrum • Result

  4. Introduction Our aim is to seethe influence of plasma on : (1) Jean’s length and sound speed (2) Density perturbation equation (3) Power spectrum

  5. Plasma Effect What is plasma ? → A partially ionized gas which is approximately neutral Plasma state of the universe : (1) Pre-recombination (2) Post-reionization → It’s what we consider

  6. Plasma Effect • Debye shielding • Landau damping → Energy exchange between particles and wave • Finite temperature →Residual electric field

  7. Evolution of baryon perturbation • Modified baryon perturbation equation : where , , term is the contribution of residual E. field

  8. Evolution of baryon perturbation • Solving the equation (1) (a) Initial perturbation : by adiabatic condition , “ * ” means reionization (b) By thermodynamics and plasma physics (c) By Fourier Transform and (b), (1) becomes

  9. Evolution of baryon perturbation Solving the equation (1) (d) To solve eq(2) for a given k-mode, we must know the relationship between Jean’s scale( ) and expansion factor By adiabatic expansion and matter dominate and ,

  10. Evolution of baryon perturbation Solving the equation (1) (e) There are three regimes of k-mode to discuss Gravity dominates : linear growth plasma oscillation dominates : oscillates

  11. Evolution of baryon perturbation • Solving the equation (1) (f) Two kinds of solutions ：

  12. Matter power spectrum • Modified power spectrum ：Transfer function ：Growth function ：Modified Growth function

  13. Matter power spectrum

  14. Result

More Related