Constraining the CMB optical depth through the dispersion measure of cosmological radio transients
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Abstract
The dispersion measure of extragalactic radio transients, such as of recently
discovered Fast Radio Burst FRB150418, can be used to measure the column
density of free electrons in the intergalactic medium. The same electrons also
scatter the Cosmic Microwave Background (CMB) photons, affecting precision
measurements of cosmological parameters. We explore the connection between the
dispersion measure of radio transients existing during the Epoch of
Reionization (EoR) and the total optical depth for the CMB,
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1475-7516