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The dispersion measure of extragalactic radio transients, such as of recentlydiscovered Fast Radio Burst FRB150418, can be used to measure the columndensity of free electrons in the intergalactic medium. The same electrons alsoscatter the Cosmic Microwave Background (CMB) photons, affecting precisionmeasurements of cosmological parameters. We explore the connection between thedispersion measure of radio transients existing during the Epoch ofReionization (EoR) and the total optical depth for the CMB, $\tau_{CMB}$,showing that the existence of such transients would provide a new sensitiveprobe of $\tau_{CMB}$. As an example, we consider the population of FRBs.Assuming they exist during the EoR, we show that: (i) such sources can probethe reionization history by measuring $\tau_{CMB}$ to sub-percent accuracy, and(ii) they can be detected with high significance by an instrument such as theSquare Kilometer Array.

Constraining the CMB Optical Depth Through the Dispersion Measure of Cosmological Radio Transients