Detecting cosmic strings with lensed fast radio bursts
نویسندگان
چکیده
Correlated red noise recently reported from pulsar timing observations may be an indication of stochastic gravitational waves emitted by cosmic strings that formed during a primordial phase transition near the grand unification energy scale. Unfortunately, known probes strings, namely microwave background anisotropies and string lensing extragalactic galaxies, are not sensitive enough for low dimensionless tensions $G\ensuremath{\mu}{c}^{\ensuremath{-}2}={10}^{\ensuremath{-}10}\ensuremath{-}{10}^{\ensuremath{-}7}$ (where tension $\ensuremath{\mu}$ is per unit length) needed to explain this putative signal. We show strong fast radio bursts (FRBs) potentially unambiguous avenue probe range values. The image pair expected have identical magnification factor parity, typical time delay $\ensuremath{\sim}{10}^{2}(G\text{ }\ensuremath{\mu}\text{ }{c}^{\ensuremath{-}2}/{10}^{\ensuremath{-}8}{)}^{2}\text{ }\text{ }\mathrm{s}$. unique spectral fingerprint each FRB, as well possibility detect correlations in series electric field waves, will enable verification interpretation. Very-long-baseline interferometry can spatially resolve provide lower bound on based separation. calculate FRB rate function detection number several different models redshift distribution. find survey detecting $\ensuremath{\sim}{10}^{5}$ FRBs, line with estimates forthcoming CHORD, uncover event $G\ensuremath{\mu}\text{ }{c}^{\ensuremath{-}2}\ensuremath{\simeq}{10}^{\ensuremath{-}7}$. Larger surveys, such Phase 2 Square Kilometre Array, potential significantly improve sensitivity }{c}^{\ensuremath{-}2}\ensuremath{\simeq}{10}^{\ensuremath{-}9}$.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevd.106.103033