1 / 28

COSMOLOGY

COSMOLOGY. International Meeting of Fundamental Physics (“Winter” meeting) Santiago de Compostela, 2007. Eduard Mas só UAB/IFAE. Program. The standard cosmological model The observed universe Inflation. Neutrinos in cosmology. Emphasis on “Particles”. Science, vol. 315, 2007.

yaron
Download Presentation

COSMOLOGY

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. COSMOLOGY International Meeting of Fundamental Physics (“Winter” meeting) Santiago de Compostela, 2007 Eduard Massó UAB/IFAE

  2. Program The standard cosmological model The observed universe Inflation. Neutrinos in cosmology Emphasis on “Particles”

  3. Science, vol. 315, 2007

  4. lights-years ago Our universe is expanding co-moving distance scale today redshift

  5. Co-moving co-ordinates On top: peculiar (real) velocities

  6. Hubble’s law & Cosmological principle Cosmological principle Universe homogenous & isotropic on large scales Hubble parameter (today) Hubble’s discovery Hubble’s law:

  7. RG + CP Expansion (or contraction) is inevitable Robertson-Walker metric (homogeneity & isotropy) Parameters: Content (matter+radiation) Content too (cosm. const.) Parameters are related by eqs. Spatial geometry

  8. Friedmann eqs. Cosmological equations 1 2a 1+2a -> 2b

  9. Spatial geometry &Light propagation Open Closed FLAT 3D

  10. Spatial geometry &Light propagation

  11. Absolute luminosity E/time in rest frame Luminosity distance Measured flux (E/time/area) Luminosity distance

  12. Hubble’s law Exact: Small z Deceleration parameter That was kinematics

  13. Cosmological constant contribution Negative pressure + any other component

  14. Solution to cosmological eqs. Equation of state Assume i - dominance and RD universe MD universe. CCD universe

  15. Critical density Define Define also (Today) Not energy-density contribution

  16. Rewriting Friedmann eqs. Cosmic sum rule 2a today Notice signs

  17. EE EE R R Diff. eq. The future + Initial conditions taken today Eternal Expansion OR Recollapse ? 1 2 3

  18. Distance - Redshift Co-moving distance to source: Where: Can neglect Distance-redshift relation is function of

  19. Age of the universe look-back time lifetime Flat univ. Our univ. (Age crisis: Open universe gave too low lifetime)

  20. Which universe ?

  21. nucleosynthesis The past universe rad recombination mat cc equality today next

  22. Equilibrium thermodynamics The hot universe g= deg. of freedom number density energy density pressure distribution

  23. rates Decoupling of species Expansion: Interaction:

  24. Phase transitionsSymmetry restoring 2n order

  25. Phase transitions 1st order

  26. Conformal time

  27. It is the physical distance photons can travel until a time t Particle Horizon Defines causal distance at a given time t

  28. Program The standard cosmological model The observed universe Inflation. Neutrinos in cosmology

More Related