Papers

Peer-reviewed
Jan, 2008

Self-similar cosmological solutions with dark energy. I. Formulation and asymptotic analysis

PHYSICAL REVIEW D
  • Tomohiro Harada
  • ,
  • Hideki Maeda
  • ,
  • B. J. Carr

Volume
77
Number
2
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1103/PhysRevD.77.024022
Publisher
AMER PHYSICAL SOC

Based on the asymptotic analysis of ordinary differential equations, we classify all spherically symmetric self-similar solutions to the Einstein equations which are asymptotically Friedmann at large distances and contain a perfect fluid with equation of state p=(gamma - 1)mu with 0 < gamma < 2/3. This corresponds to a "dark energy" fluid and the Friedmann solution is accelerated in this case due to antigravity. This extends the previous analysis of spherically symmetric self-similar solutions for fluids with positive pressure (gamma > 1). However, in the latter case there is an additional parameter associated with the weak discontinuity at the sonic point and the solutions are only asymptotically "quasi-Friedmann," in the sense that they exhibit an angle deficit at large distances. In the 0 < gamma < 2/3 case, there is no sonic point and there exists a one-parameter family of solutions which are genuinely asymptotically Friedmann at large distances. We find eight classes of asymptotic behavior: Friedmann or quasi-Friedmann or quasistatic or constant-velocity at large distances, quasi-Friedmann or positive-mass singular or negative-mass singular at small distances, and quasi-Kantowski-Sachs at intermediate distances. The self-similar asymptotically quasistatic and quasi-Kantowski-Sachs solutions are analytically extendible and of great cosmological interest. We also investigate their conformal diagrams. The results of the present analysis are utilized in an accompanying paper to obtain and physically interpret numerical solutions.

Link information
DOI
https://doi.org/10.1103/PhysRevD.77.024022
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000252864000072&DestApp=WOS_CPL
ID information
  • DOI : 10.1103/PhysRevD.77.024022
  • ISSN : 2470-0010
  • eISSN : 2470-0029
  • Web of Science ID : WOS:000252864000072

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