The Axis of Evil: revisited

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Presentation transcript:

The Axis of Evil: revisited Kate Land The Axis of Evil: revisited astro-ph/0611518, 0502237, 0507289

THE ISSUES AXIS OF EVIL Planarity Alignments Low-power Ecliptic issues OTHER Asymmetries Cold spot 27/03/07 The Axis of Evil Revisited. Kate Land

PLANARITY & AOE “Intriguingly, both the quadrupole and the octopole are seen to have power suppressed along a particular spatial axis, which lines up between the two, roughly towards (l, b) ~ (-110, 60) in Virgo.” Tegmark & al.PRD(68)123523 27/03/07 The Axis of Evil Revisited. Kate Land

A posteriori planarity Quadrupole l = 2 m = 2 m = 0 27/03/07 The Axis of Evil Revisited. Kate Land

A posteriori planarity Octopole l = 3 m = 3 m = 1 27/03/07 The Axis of Evil Revisited. Kate Land

‘Planarity’ is quite normal - BUT THE AXIS IS NOT! 27/03/07 The Axis of Evil Revisited. Kate Land

Axis of Evil Independent of Gaussianity Hard to test 27/03/07 The Axis of Evil Revisited. Kate Land

Maximum Likelihood Avoid instabilities Allow model comparison (Bayesian V Freq) Multipoles share axis, and ratio 27/03/07 The Axis of Evil Revisited. Kate Land

Models Null ‘Planarity’ l = 2, 3 m = l ‘m-preference’ l = 2 - 5 m free Parameters: ‘m-preference’ l = 2 - 5 m free Parameters: 27/03/07 The Axis of Evil Revisited. Kate Land

Maximum Likelihood 27/03/07 The Axis of Evil Revisited. Kate Land

Significance Compare to simulations Information criteria ‘planarity’ AIC ~ 2, BIC ~ 2.8 ‘m-pref’ AIC ~ 2.8, BIC ~ 0 Jeffreys’ scale > 2.5 ‘strong’ 27/03/07 The Axis of Evil Revisited. Kate Land

Bayesian evidence 27/03/07 The Axis of Evil Revisited. Kate Land

What can we conclude? Evidence for AOE depends on model and method! Similarly for ns<1 (Liddle astro-ph/0701113) Important consequences Combined with other anomalies SYSTEMATICS Satellite, data pipeline, … ASTROPHYSICAL EFFECT Foregrounds, local lensing, … COSMOLOGICAL FEATURE Non-FLRW models, non-trivial topology, … 27/03/07 The Axis of Evil Revisited. Kate Land

The Axis of Evil II - Summary Correlations seen for l = 2,3,4,5 But how do we test the significance? Propose a model Frequentist Bayesian Planarity m-preference 27/03/07 The Axis of Evil Revisited. Kate Land

Priors 27/03/07 The Axis of Evil Revisited. Kate Land

Axis of Evil ~(260,60) Dipole (264,48) Virgo ~(260,70) Max asym axis (57,10) Ecliptic pole (96,30) SG pole (47,6) Cold spot (209,-57) 27/03/07 The Axis of Evil Revisited. Kate Land

Information criteria 27/03/07 The Axis of Evil Revisited. Kate Land

?? 27/03/07 The Axis of Evil Revisited. Kate Land