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Article overview
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Constraints on millicharged dark matter and axion-like particles from timing of radio waves | | Andrea Caputo
; Laura Sberna
; Miguel Frias
; Diego Blas
; Paolo Pani
; Lijing Shao
; Wenming Yan
; | | Date: |
7 Feb 2019 | | Abstract: | We derive novel constraints on millicharged dark matter and ultralight
axion-like particles (that may or may not be part of the dark matter sector)
using pulsar timing and fast radio burst observations. Millicharged dark matter
affects the dispersion measure of the time of arrival of radio pulses in a way
analogous to free electrons. Light pseudo-scalar particles generically modify
the dispersion measure in the presence of magnetic fields through the axial
coupling. Furthermore, if they constitute the dark matter, they generate an
oscillating polarization angle of the radio signals. We show that current and
future data can set strong constraints in both cases. For dark matter particles
of charge $epsilon e$, these constraints are ${epsilon}/{m_{
m milli}}
lesssim 10^{-9}{
m eV}^{-1}$, for masses $m_{
m milli}gtrsim 10^{-6},$eV.
The bound scales as $(
ho_{
m milli}/
ho_{
m dm})^{1/2}$ if the
millicharged component is a fraction of the total dark matter energy density,
$
ho_{
m dm}$. For axion-like particles, we derive the expected bounds on the
the axial coupling from modifications in the dispersion of the pulses in the
presence of the observed galactic magnetic fields. We also bound this coupling
from data of pulsar polarization in the case where (ultra-light) axion-likes
particles constitute the dark matter. Our analysis shows that the study of
radio waves from pulsars can set the most stringent constraints on axion-like
particles for $m_asim 10^{-22}$-$10^{-15},$eV. | | Source: | arXiv, 1902.2695 | | Services: | Forum | Review | PDF | Favorites | |
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