On generalized chaplygin gas
Download
1 / 21

On Generalized Chaplygin Gas - PowerPoint PPT Presentation


  • 85 Views
  • Uploaded on

On Generalized Chaplygin Gas. Yungui Gong 龚云贵 重庆邮电学院. 10/23/2004. 超弦 / 理论、粒子物理及宇宙学专题研讨会 10 月 21 日 -11 月 3 日. Motivation. Chaplygin gas. As a perfect fluid with the equation of state. Motivation: Nambu-Goto action for a d-brane moving in a

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' On Generalized Chaplygin Gas' - joshua


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
On generalized chaplygin gas

On Generalized Chaplygin Gas

Yungui Gong

龚云贵

重庆邮电学院

10/23/2004

超弦/理论、粒子物理及宇宙学专题研讨会10月21日-11月3日



Chaplygin gas
Chaplygin gas

As a perfect fluid with the equation of state

Motivation: Nambu-Goto action for a d-brane moving in a

(d+2)-dimensional spacetime in the light-cone parameterization

Quintessence filed potential



Generalized chaplygin gas
Generalized Chaplygin Gas

As a perfect fluid with the equation of state

Quintessence filed potential

Flat universe, Chaplygin gas is the only source




Constraints
Constraints and dark energy

  • The total energy density is non-negative

  • The current density is not increasing

  • Sound speed

(1)

(2)

(3)


Constraints on gcg
Constraints on GCG and dark energy

(1)

(2) Used (1)

(3) Used (1)


Physical constraints
Physical Constraints and dark energy

From (2), we get


Sn fitting method
SN Fitting Method and dark energy


Age fitting
Age fitting and dark energy


Current measurements on matter density
Current Measurements on matter density and dark energy

Peebles, PJE, astro-ph/0410284


ad