1 / 18

The Axis of Evil: revisited

The Axis of Evil: revisited. Kate Land. astro-ph/0611518, 0502237, 0507289. THE ISSUES. AXIS OF EVIL Planarity Alignments Low-power Ecliptic issues. OTHER Asymmetries Cold spot. PLANARITY & AOE.

gittel
Télécharger la présentation

The Axis of Evil: revisited

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

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

  3. 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 The Axis of Evil Revisited. Kate Land

  4. m = 2 m = 0 A posteriori planarity Quadrupole l = 2 The Axis of Evil Revisited. Kate Land

  5. m = 3 m = 1 A posteriori planarity Octopole l = 3 The Axis of Evil Revisited. Kate Land

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

  7. Axis of Evil Independent of Gaussianity Hard to test The Axis of Evil Revisited. Kate Land

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

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

  10. Maximum Likelihood The Axis of Evil Revisited. Kate Land

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

  12. Bayesian evidence The Axis of Evil Revisited. Kate Land

  13. 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, … The Axis of Evil Revisited. Kate Land

  14. 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 The Axis of Evil Revisited. Kate Land

  15. Priors The Axis of Evil Revisited. Kate Land

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

  17. Information criteria The Axis of Evil Revisited. Kate Land

  18. ?? The Axis of Evil Revisited. Kate Land

More Related