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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. Motivation. Chaplygin gas. As a perfect fluid with the equation of state. Motivation: Nambu-Goto action for a d-brane moving in a

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On Generalized Chaplygin Gas

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  1. 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

  2. Motivation

  3. 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

  4. Cosmological Solution

  5. Generalized Chaplygin Gas As a perfect fluid with the equation of state Quintessence filed potential Flat universe, Chaplygin gas is the only source

  6. Cosmological Solution: Possible Unification of dark matter and dark energy

  7. Chaplygin gas as dark energy

  8. Constraints • The total energy density is non-negative • The current density is not increasing • Sound speed (1) (2) (3)

  9. Constraints on GCG (1) (2) Used (1) (3) Used (1)

  10. Physical Constraints From (2), we get

  11. SN Fitting Method

  12. Age fitting

  13. Current Measurements on matter density Peebles, PJE, astro-ph/0410284

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