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Hemispherical Power Asymmetry 郭宗宽 昆明 2013.11.2. anomalies in CMB map the quadrupole-octopole alignment power deficit at low- l hemispherical asymmetry.

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Presentation on theme: "Hemispherical Power Asymmetry 郭宗宽 昆明 2013.11.2. anomalies in CMB map the quadrupole-octopole alignment power deficit at low- l hemispherical asymmetry."— Presentation transcript:

1 Hemispherical Power Asymmetry 郭宗宽 昆明 2013.11.2

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

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5 data analysis the CMB temperature sky maps is modeled as the likelihood is given by C.Gordon, W.Hu, D.Huterer and T.M.Crawford, arXiv:astro-ph/0509301 H.K.Eriksen, A.J.Banday, K.M.Gorski, F.K.Hansen and P.B.Lilje, arXiv:astro-ph/0701089

6 the full covariance matrix is WMAP3: ( l, b ) = (225◦,−27◦), A =0.114

7 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.Hansen and P.B.Lilje, arXiv:0903.1229 P.A.R.Ade et al. [Planck Collaboration], arXiv:1303.5083

8 preferred dipole directions dependence on smoothing scale

9 Comment: the dipole anisotropy induced by our velocity the temperature and direction in the observed frame the inferred temperature fluctuations ( l, b ) = (264◦,48◦)

10 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]

11 a superhorizon perturbation A.L.Erickcek, M.Kamionkowski and S.M.Carroll, arXiv:0806.0377 the Sachs-Wolfe effect

12 the diploe modulation of curvature perturbation the asymmetry A is a single modulated mode D.H.Lyth, arXiv:1304.1270 Z.G.Liu, Z.K.Guo and Y.S.Piao, arXiv:1304.6527

13 the CMB angular power spectrum the GZ effect (the Sachs-Wolfe approximation) observational constraint

14 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

15 primordial power spectrum of curvature perturbations

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

17 Thanks!


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