Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization

Kothari, Rahul; Ghosh, Shamik; Rath, Pranati K.; Kashyap, Gopal; Jain, Pankaj

doi:10.1093/mnras/stw1039

Cited by 15 publications

(23 citation statements)

References 70 publications

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“…This term successfully explained the observed hemispherical power asymmetry Kothari et al 2016;Ghosh et al 2016;Li et al 2015b). Next, we will discuss the quadrupolar modulation term in the power spectrum.…”

Section: Application On Cmb Datamentioning

confidence: 71%

Anisotropic power spectrum and the observed low-lpower in PLANCK CMB data

Chang

Rath

Sang

et al. 2018

Res. Astron. Astrophys.

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In this work, we study a direction dependent power spectrum in anisotropic Finsler space-time. We use this direction dependent power spectrum to address the low-l power observed in WMAP and PLANCK data. The angular power spectrum of the temperature fluctuations has a lower amplitude in comparison to the ΛCDM model in the multipole range l = 2 − 40. Our theoretical model gives a correction to the isotropic angular power spectrum C T T l due to the breaking of the rotational invariance of the primordial power spectrum. We estimate best-fit model parameters along with the six ΛCDM cosmological parameters using PLANCK likelihood code in CosmoMC software. We see that this modified angular power spectrum fits the CMB temperature data in the multipole range l = 2 − 10 to a good extent but fails for the whole multipole range l = 2 − 40.

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Section: Application On Cmb Datamentioning

confidence: 71%

Anisotropic power spectrum and the observed low-lpower in PLANCK CMB data

Chang

Rath

Sang

et al. 2018

Res. Astron. Astrophys.

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“…Recently, Ref. [67] used the power asymmetry of CMB temperature fluctuations [11,12] to give a restriction on C ll+1 . The ratio of C ll+1 to the power C l is found to be roughly around 0.02 for l = 2 and decays for larger l values.…”

Section: Contributions To Cmb Power Spectra From Anisotropic Inflatiomentioning

confidence: 99%

Anisotropic inflation in the Finsler spacetime

Wang

Chang

2015

Eur. Phys. J. C

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We suggest the universe is Finslerian in the stage of inflation. The Finslerian background spacetime breaks rotational symmetry and induces parity violation. The primordial power spectrum is given for the quantum fluctuation of the inflation field. It depends not only on the magnitude of the wavenumber but also on the preferred direction. We derive the gravitational field equations in the perturbed Finslerian background spacetime, and we obtain a conserved quantity outside the Hubble horizon. The angular correlation coefficients are presented in our anisotropic inflation model. The parity violation feature of Finslerian background spacetime requires that the anisotropic effect only appears in the angular correlation coefficients if l = l + 1. The numerical results of the angular correlation coefficients are given describing the anisotropic effect.

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“…The imaginary part of the form factor has been chosen so that we obtain the power required to fit the data [45,46]. We point out that the dipolar power spectrum was found to decay by approximately one power of k higher than the standard scale invariant power spectrum [45].…”

Section: Power Spectrum In Frw Backgroundmentioning

confidence: 99%

Cosmological power spectrum in a noncommutative spacetime

2016

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We propose a generalized star product which deviates from the standard product when the fields at evaluated at different space-time points. This produces no changes in the standard Lagrangian density in noncommutative space-time but produces a change in the cosmological power spectrum. We show that the generalized star product leads to physically consistent results and can fit the observed data on hemispherical anisotropy in the cosmic microwave background radiation.

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Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization

Cited by 15 publications

References 70 publications

Anisotropic power spectrum and the observed low-lpower in PLANCK CMB data

Anisotropic power spectrum and the observed low-lpower in PLANCK CMB data

Anisotropic inflation in the Finsler spacetime

Cosmological power spectrum in a noncommutative spacetime

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