שיעור 11 מבוא לקוסמולוגיה. Observational facts Density contrast at small scales.

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Presentation transcript:

שיעור 11 מבוא לקוסמולוגיה

Observational facts Density contrast at small scales

Anisotropy at small scales

Homogeneity and isotropy at large scales Homogeneity and isotropy at large scales

Olbers’ paradox Why the sky is dark ? Olbers’ paradox Why the sky is dark ?

Hubble expansion 1929 redshift

1996

Expanding space

Distance: coordinates and proper distances Distance: coordinates and proper distances

Lookback time

Looking into past Looking into past

Curvature

Cosmological resdshift Cosmological resdshift

Cosmological change of angular size Cosmological change of angular size

Horizons

Test particle

Friedmann’s equations

Deceleration parameter and critical density Deceleration parameter and critical density

How parameters depend on a ?