Large-scale homogeneity vs. small- scale inhomogeneity: testing ...

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• Nature of dark energy Peculiar Velocities as a cosmology − Expansion history H(z) − Growth of structure f=Ω m (z) γ • PVs are direct probe of gravity − Can test General Relativity, modified gravity − β=f/b : redshift- space distortion parameter, from combination of velocity & density • Nature of dark matter − Particle nature − Nature & evolution of structure • σ 8 , Ω m constraints • Tests of backreaction 01/18/2013 probe I Image: NASA/WMAP Science team Morag I. Scrimgeour 34
Advantages Peculiar Velocities as a Cosmology • Trace underlying matter field (incl. Dark Matter) • Independent of galaxy bias • Complementary to RSDs • Sensitive to large-<strong>scale</strong> modes Disadvantages • <strong>Large</strong> distance errors • Low redshift only • Possible systematics 01/18/2013 − Malmquist bias Image: The Cosmic Perspective (1998) Probe II Morag I. Scrimgeour 35
Page 1 and 2: ICRAR is a partnership between the
Page 3 and 4: 01/18/2013 Testing large-scale cosm
Page 5 and 6: Inhomogeneity: alternative to Dark
Page 7 and 8: • So far, results are conflicting
Page 9 and 10: Fractal (correlation) dimension D 2
Page 11 and 12: 01/18/2013 Selection Function Corre
Page 13 and 14: • In ΛCDM expect: − Small scal
Page 15 and 16: How do we define the “homogeneity
Page 17 and 18: 01/18/2013 0.3
Page 19 and 20: 01/18/2013 0.7
Page 21 and 22: 01/18/2013 ΛCDM D 2(r) model: effe
Page 23 and 24: Scrimgeour et al. (2012) 01/18/2013
Page 25 and 26: • WiggleZ measurement of homogene
Page 27 and 28: 01/18/2013 What are peculiar veloci
Page 29 and 30: 01/18/2013 Large-scale Dark Matter
Page 32 and 33: • Nature of dark energy − Expan
Page 36 and 37: 01/18/2013 • Bulk Flow / dipole (
Page 38 and 39: Bulk flows and dark flows: a proble
Page 40 and 41: 01/18/2013 Conflicting σ 8 constra
Page 42 and 43: 01/18/2013 Several potential system
Page 44 and 45: 6dFGS Peculiar Velocities • Spect
Page 46 and 47: ~500 Type Ia SNe over 5 years (Scri
Page 48 and 49: 01/18/2013 Bulk flow distribution
Page 50 and 51: 01/18/2013 True bulk flow The ‘re
Page 52 and 53: 01/18/2013 True bulk flow Observed
Page 54 and 55: 01/18/2013 Bulk Flow Systematics fr
Page 56 and 57: N(z) 01/18/2013 4000 3500 3000 2500
Page 58: Homogeneity in the WiggleZ Survey S

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