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

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Even if we have large-scale homogeneity… • Statistical tools used to test cosmology (Power Spectrum, Correlation Function) require homogeneity on scale of survey 01/18/2013 − Their definition and calculation requires mean density (from largest scales in survey): P(r) = ! 2 [ 1+"(r) ]dV1dV2 − Mean density undefined below scale of homogeneity → results can be misleading − Important to know scale of transition to homogeneity WiggleZ correlation function at z=0.6 Blake et al. (2010) Morag I. Scrimgeour 6
• So far, results are conflicting! • Homogeneity ~ 70 h -1 Mpc: SDSS LRGs (Hogg et al. 2005), SDSS DR1 (Yadav et al. 2005), SDSS DR6 (Sarkar et al. 2009) • But several works find fractal structure up to scales >100 h -1 Mpc - no transition to homogeneity (e.g. Joyce et al. 1999, Sylos Labini et al. 2009) 01/18/2013 Homogeneity in Galaxy Surveys Image: M.Blanton and the SDSS collaboration Morag I. Scrimgeour 7
Page 1 and 2: ICRAR is a partnership between the
Page 3 and 4: 01/18/2013 Testing large-scale cosm
Page 5: Inhomogeneity: alternative to Dark
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 34 and 35: • Nature of dark energy Peculiar
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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