Browsing by Author "Ng, Kin-Wang"
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Item Gravity Waves from Quantum Stress Tensor Fluctuations in Inflation(2011-12-09) Ng, Kin-WangItem Ultra-light Axion Dark Matter and CMB B-mode Polarization(2017-05) Ng, Kin-WangWe 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.