Evolution of small-scale cosmological baryon perturbations and matter transfer functions

Kazuhiro Yamamoto, Naoshi Sugiyama, Humitaka Sato

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The evolution of small-scale cosmological perturbations is carefully reexamined. Through interactions with photons via electrons, baryon perturbations show interesting behavior on some physical scales. Characteristic features of the evolution of baryon density fluctuations are discussed. In CDM models, a power-law growing phase of the small-scale baryon density fluctuations is found, characterized by a terminal velocity after the diffusion (Silk) damping and before the decoupling epoch. A transfer function for total matter-density fluctuations is then studied by taking those physical processes into account. We present an analytic transfer function as a function of redshift z that is applicable for the entire range up to a solar-mass scale in the high-z universe, and that is also suitable for high baryon fraction models.

Original languageEnglish
Pages (from-to)442-460
Number of pages19
JournalAstrophysical Journal
Volume501
Issue number2 PART 1
DOIs
Publication statusPublished - Jul 10 1998

Fingerprint

transfer function
transfer functions
baryons
perturbation
terminal velocity
silk
analytic functions
damping
power law
decoupling
electron
universe
time measurement
photons
electrons
interactions

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Evolution of small-scale cosmological baryon perturbations and matter transfer functions. / Yamamoto, Kazuhiro; Sugiyama, Naoshi; Sato, Humitaka.

In: Astrophysical Journal, Vol. 501, No. 2 PART 1, 10.07.1998, p. 442-460.

Research output: Contribution to journalArticle

Yamamoto, Kazuhiro ; Sugiyama, Naoshi ; Sato, Humitaka. / Evolution of small-scale cosmological baryon perturbations and matter transfer functions. In: Astrophysical Journal. 1998 ; Vol. 501, No. 2 PART 1. pp. 442-460.
@article{6e0d9162f20149a1a4a903bd49de231e,
title = "Evolution of small-scale cosmological baryon perturbations and matter transfer functions",
abstract = "The evolution of small-scale cosmological perturbations is carefully reexamined. Through interactions with photons via electrons, baryon perturbations show interesting behavior on some physical scales. Characteristic features of the evolution of baryon density fluctuations are discussed. In CDM models, a power-law growing phase of the small-scale baryon density fluctuations is found, characterized by a terminal velocity after the diffusion (Silk) damping and before the decoupling epoch. A transfer function for total matter-density fluctuations is then studied by taking those physical processes into account. We present an analytic transfer function as a function of redshift z that is applicable for the entire range up to a solar-mass scale in the high-z universe, and that is also suitable for high baryon fraction models.",
author = "Kazuhiro Yamamoto and Naoshi Sugiyama and Humitaka Sato",
year = "1998",
month = "7",
day = "10",
doi = "10.1086/305841",
language = "English",
volume = "501",
pages = "442--460",
journal = "Astrophysical Journal",
issn = "0004-637X",
number = "2 PART 1",

}

TY - JOUR

T1 - Evolution of small-scale cosmological baryon perturbations and matter transfer functions

AU - Yamamoto, Kazuhiro

AU - Sugiyama, Naoshi

AU - Sato, Humitaka

PY - 1998/7/10

Y1 - 1998/7/10

N2 - The evolution of small-scale cosmological perturbations is carefully reexamined. Through interactions with photons via electrons, baryon perturbations show interesting behavior on some physical scales. Characteristic features of the evolution of baryon density fluctuations are discussed. In CDM models, a power-law growing phase of the small-scale baryon density fluctuations is found, characterized by a terminal velocity after the diffusion (Silk) damping and before the decoupling epoch. A transfer function for total matter-density fluctuations is then studied by taking those physical processes into account. We present an analytic transfer function as a function of redshift z that is applicable for the entire range up to a solar-mass scale in the high-z universe, and that is also suitable for high baryon fraction models.

AB - The evolution of small-scale cosmological perturbations is carefully reexamined. Through interactions with photons via electrons, baryon perturbations show interesting behavior on some physical scales. Characteristic features of the evolution of baryon density fluctuations are discussed. In CDM models, a power-law growing phase of the small-scale baryon density fluctuations is found, characterized by a terminal velocity after the diffusion (Silk) damping and before the decoupling epoch. A transfer function for total matter-density fluctuations is then studied by taking those physical processes into account. We present an analytic transfer function as a function of redshift z that is applicable for the entire range up to a solar-mass scale in the high-z universe, and that is also suitable for high baryon fraction models.

UR - http://www.scopus.com/inward/record.url?scp=0032503786&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032503786&partnerID=8YFLogxK

U2 - 10.1086/305841

DO - 10.1086/305841

M3 - Article

AN - SCOPUS:0032503786

VL - 501

SP - 442

EP - 460

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 1

ER -