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Probing the anisotropic distribution of baryon matter in the Universe using fast radio bursts
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abstract
We propose that fast radio bursts (FRBs) can be used as the probes to constrain the possible anisotropic distribution of baryon matter in the Universe. Monte Carlo simulations show that, 400 (800) FRBs are enough to detect the anisotropy at 95\% (99\%) confidence level, if the dipole amplitude is at the order of magnitude 0.01. However, much more FRBs are required to tightly constrain the dipole direction. Even 1000 FRBs are far from enough to constrain the dipole direction within angular uncertainty $\Delta\theta<40^{\circ}$ at 95\% confidence level. The uncertainty on the dispersion measure of host galaxy does not significantly affect the results. If the dipole amplitude is in the level of 0.001, however, 1000 FRBs are not enough to correctly detect the anisotropic signal.
Forward citations
Cited by 2 Pith papers
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Cosmological-model independent limits on photon mass from FRB and SNe data
From 68 fast radio bursts and 1048 supernovae, the authors find a photon rest mass of roughly 18 to 29 times 10^-51 kilograms depending on the assumed intergalactic gas fraction, with zero mass still allowed at 2 to 3 sigma.
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Estimating the baryon fraction in the IGM from well-localized FRBs and DESI data
Using 107 localized FRBs with DESI BAO and supernova distances, the author estimates fIGM near 0.99 in the constant model but finds Bayesian evidence inconclusive between constant and evolving baryon fraction.
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