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Coupled Quintessence & Its Application To Cosmology

Coupled Quintessence & Its Application To Cosmology. KPS82. Apr.21. 06 Seokcheon Lee Institute of Physics, Academia Sinica. Outline. Experimental Evidences Modifications of Gravity Models Effects of Quintessence Couplings to Matter & Radiation Evolution of Background CMB Spectrum

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Coupled Quintessence & Its Application To Cosmology

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  1. Coupled Quintessence & Its Application To Cosmology KPS82. Apr.21. 06 Seokcheon Lee Institute of Physics, Academia Sinica

  2. Outline • Experimental Evidences • Modifications of Gravity • Models • Effects of Quintessence Couplings to Matter & Radiation • Evolution of Background • CMB Spectrum • Matter Power Spectrum • Time Varying Alpha • Summary

  3. Experimental Evidences • SNe Ia ( z < 2, Multi Integral) • WMAP • Age of Universe • Clustering of Matter  SDSS, 2dFGRS

  4. Modifications of Gravity • Scalar-Tensor Theories • Modified Newtonian Gravity (MOND) • Brane Models (Warped, Large Extra Dimensions) • f(R) Gravity

  5. Quintessence • Quintessence = Fifth Element • Air, Earth, Fire, Water (In Alchemy) • b, DM, n, g (In Cosmology) • Tip : Milla Jovovich (In Film)

  6. Quintessence Potentials

  7. Model • Coupled Quintessence (S.L, K.Olive, M.Pospelov, 04) • Potential : • Coupling :

  8. Evolution of Background I • Energy-momentum conservation

  9. Evolution of Background II

  10. Linear Perturbation I • Conformal Newtonian Gauge (H.Kodama, M.Sasaki, 1984)

  11. Linear Perturbation II • Boltzmann equations

  12. Isocurvature condition • Pressure Fluctuation • At Tracking Region

  13. CMB I • (S.L 05)

  14. CMB II • SL,GC Liu, KW Ng (06)

  15. WMAP 1st and 3rd Data

  16. Matter Power Spectrum

  17. Matter Power Spectrum II

  18. Time Varying Alpha

  19. Summary • Coupled QCDM seems to be consistent with current data (better than LCDM ?). • Combination of CMB and Matter Power Spectrum survey will be able to give limit of coupling between DE and DM. (n ~ O(2)). • Quintessence can explain time varying alpha. • Is there any possible DE couplings to baryons and (or) to radiation?

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