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General Relativistic Alternatives for Dark Matter and Dark Energy

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General Relativistic Alternatives for Dark Matter and Dark Energy

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    1. 1 General Relativistic Alternatives for Dark Matter and Dark Energy

    2. Premise of this talk: Dark energy and dark matter contribute comparable amounts of mass energy

    3. 3

    4. 4 Transfer from/to the Bulk leads to Modified Cosmic Expansion E = “Dark Radiation” or Electric part of the bulk Weyl tensor

    5. 5 Accelerating Cosmology

    6. 6

    7. 7

    8. 8

    9. Bulk Viscosity and Decaying Dark Matter G. J. Mathews, N. Q. Lan, C. Kolda - Univ. Notre Dame J. R. Wilson, LLNL G. M. Fuller, UC San Diego PRD in press/ astro-ph/0609687 Decaying dark matter leads to dissipative bulk viscosity in the cosmic fluid This viscosity may account for some or all of the apparent cosmic acceleration

    10. Viscous Dark Matter Weinberg (1971)

    11. Need a Physical Model for Bulk Viscosity

    12. During decay: matter and relativistic particles are out of pressure and temperature equilibrium

    13. Candidates for Decaying Dark Matter Late Cascading decays: Sterile neutrinos ?S ? ?e ?1? ?2? ?3? ?4? ?5? ?6? regular neutrinos Late decays due to time varying mass or a late phase transition: sneutrino ? ? g??e Gauge mediated supersymmetry breaking ? ? ?R + ?R

    14. Late Decaying Particles

    15. 15 Late Decaying Particles

    16. 16 Dark Energy Could be Correction for Non-Friedmannian Clumpy Cosmology

    17. 17 Schools of Thought:

    18. Modified Friedman Equation Zhao, Haywood Mathews (2006)

    19. Large Scale Structure Zhao, Mathews, Haywood (2006)

    20. 20 Conclusions

    22. Is it vacuum energy?

    23. Could Galaxy Rotation Curves be accounted for by relativistic corrections instead of dark matter? Cooperstock & Tieu astro-ph/0507619, 0512048 Menzies & Mathews gr-qc/0604092

    24. Cooperstock & Tieu Model

    25. 25 Problem with this picture Implies DM is moved to outside galaxies, but is still there:

    26. Parametrize EOS in Bulk Only works if: q < 3 Dark Matter is increasing

    27. Particle decay

    28. Why this does not work

    29. Bulk Viscosity can fit the SNIa redshift relation

    30. How to fix this? Late decays: Cascading decays: Sterile neutrinos ?1? ?2? ?3? ?4? ?5? ?6? regular neutrinos Late decays due to time varying mass or a late phase transition

    32. Cascading particle Decays ?1? ?2? ?3? ?4? ?5? ?6?

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