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Improvement of cosmological constraints with the cross correlation between line-of-sight optical galaxy and FRB dispersion measure

Fast Radio Bursts (hereafter FRBs) can be used in cosmology by studying the Dispersion Measure (hereafter DM) as a function of redshift. The large scale structure of matter distribution is regarded as a major error budget for such application. Using optical galaxy and dispersion measure mocks built from N-body simulations, we have shown that the galaxy number density can be used as a tracer for large scale electron density and help improve the measurement of DM as a function of redshift. We have shown that, using the line-of-sight galaxy number counts within 1' around the given localized FRB source can help improve the cosmological parameter constraints by more than 20%.

preprint2022arXivOpen access
Chenghao ZhuJiajun Zhang
astro-ph.CO
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Chenghao ZhuJiajun Zhang

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