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Ultra-light Axion Dark Matter and CMB B-mode Polarization

Ng, Kin-Wang
2017-05
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Ultra-light Axion Dark Matter and CMB B-mode Polarization

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2017-05

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We propose a new source of anisotropic cosmic birefringence induced by dark matter adiabatic density perturbation. If dark matter is ultralight axions that carry a coupling to photon, its adiabatic density fluctuations will induce anisotropic cosmic birefringence with a blue-tilted rotation power spectrum, thus generating CMB B-mode polarization on sub-degree angular scales. It is shown that the birefringence B modes can dominate over CMB lensing B modes at high l, manifesting as an excess power for l>1500 in future CMB lensing B-mode searches.

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Olivefest: Astroparticle Physics Looking Forward 2017

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Ng, Kin-Wang. (2017). Ultra-light Axion Dark Matter and CMB B-mode Polarization. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/188202.

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