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Hemispherical Power Asymmetry 郭宗宽. 昆明 2013.11.2. anomalies in CMB map. t he quadrupole-octopole alignment p ower deficit at low- l hemispherical asymmetry parity asymmetry the cold spot ……. data analysis. the CMB temperature sky maps is modeled as.

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anomalies in cmb map
anomalies in CMB map
  • the quadrupole-octopole alignment
  • power deficit at low-l
  • hemispherical asymmetry
  • parity asymmetry
  • the cold spot
  • ……
data analysis
data analysis

the CMB temperature sky maps is modeled as

C.Gordon, W.Hu, D.Hutererand T.M.Crawford, arXiv:astro-ph/0509301

the likelihood is given by

H.K.Eriksen, A.J.Banday, K.M.Gorski, F.K.Hansenand P.B.Lilje, arXiv:astro-ph/0701089

slide6

the full covariance matrix is

  • WMAP3: (l, b) = (225◦,−27◦), A=0.114
slide7

WMAP5(l<64, 4.5◦):

(l, b) = (224◦,−22◦), A=0.0720.022

  • Planck:

J.Hoftuft, H.K.Eriksen, A.J.Banday, K.M.Gorski, F.K.Hansenand P.B.Lilje, arXiv:0903.1229

P.A.R.Ade et al. [Planck Collaboration], arXiv:1303.5083

slide8

dependence on smoothing scale

preferred dipole directions

slide9

Comment: the dipole anisotropy induced by our velocity

the temperature and direction in the observed frame

the inferred temperature fluctuations

(l, b) = (264◦,48◦)

models
models
  • a parameterization [astro-ph/0509301]
  • our peculiar motion [arXiv:1304.3506]
  • a gauge field [arXiv:1302.7304]
  • anisotropic metric [arXiv:1303.6058]
  • a modulation of a cosmological parameter [arXiv:1303.6949]
  • a superhorizon perturbation [arXiv:0806.0377]
  • …… [arXiv:yymm.xxxx]
slide11

asuperhorizon perturbation

the Sachs-Wolfe effect

A.L.Erickcek, M.Kamionkowski and S.M.Carroll, arXiv:0806.0377

slide12

the diploe modulation of curvature perturbation

D.H.Lyth, arXiv:1304.1270

the asymmetry A is

a single modulated mode

Z.G.Liu, Z.K.Guo and Y.S.Piao, arXiv:1304.6527

slide13

the CMB angular power spectrum

the GZ effect (the Sachs-Wolfe approximation)

observational constraint

slide14

a single-field slow-roll inflation

  • a curvaton-type field
  • a bounce inflation

A.L.Erickcek, M.Kamionkowski and S.M.Carroll, arXiv:0806.0377

D.H.Lyth, arXiv:1304.1270

Z.G.Liu, Z.K.Guo and Y.S.Piao, arXiv:1304.6527

outlook
outlook
  • semispherical power asymmetry
  • power deficit on large angular scales
  • signals in the TEand EE spectra?
  • scale dependent? A<0.015 (99% CL)