Kavli Affiliate: Toshiya Namikawa
| First 5 Authors: Toshiya Namikawa, Toshiya Namikawa, , ,
| Summary:
We present constraints on isotropic cosmic birefringence induced by
axion-like particles (ALPs), derived from the analysis of cosmic microwave
background (CMB) polarization measurements obtained with the high-frequency
channels of Planck. Recent measurements report a hint of isotropic cosmic
birefringence, though its origin remains uncertain. The detailed dynamics of
ALPs can leave characteristic imprints on the shape of the $EB$ angular power
spectrum, which can be exploited to constrain specific models of cosmic
birefringence. We first construct a multi-frequency likelihood that
incorporates an intrinsic nonzero $EB$ power spectrum. We also show that the
likelihood used in previous studies can be further simplified without loss of
generality. Using this framework, we simultaneously constrain the ALP model
parameters, the instrumental miscalibration angle, and the amplitudes of the
$EB$ power spectrum of a Galactic dust foreground model. We find that, if ALPs
are responsible for the observed cosmic birefringence, ALP masses at
$log_10m_phi[rm eV]simeq-27.8$, $-27.5$, $-27.3$, $-27.2$, $-27.1$,
as well as $log_10m_phi[rm eV]in[-27.0,-26.5]$, are excluded at more
than $2,sigma$ statistical significance.
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