Constraining violations of the weak equivalence principle Using CHIME FRBs

Sen, Kaustubha; Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong‐Jin; Chen, Bo-Han; Santos, Daryl Joe D.; Ho, S. Y.; On, Alvina Y. L.; Lu, Ting-Yi; Hsiao, Tiger Yu-Yang

doi:10.1093/mnras/stab3344

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…In Sen et al (2021) the CHIME FRBs are used to constrain ∆γ. However, their analysis relies on the faulty assumptions pointed out by Minazzoli et al (2019); Reischke et al (2022) and therefore cannot be compared to the results presented here.…”

Section: Comparison To Other Constraints On the Wepmentioning

confidence: 99%

Consistent Constraints on the Equivalence Principle from localised Fast Radio Bursts

Reischke¹,

Hagstotz²

2023

Preprint

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Fast Radio Bursts (FRBs) are short astrophysical transients of extragalactic origin. Their burst signal is dispersed by the free electrons in the large-scale-structure (LSS), leading to delayed arrival times at different frequencies. Another potential source of time delay is the well known Shapiro delay, which measures the space-space and time-time metric perturbations along the line-of-sight. If photons of different frequencies follow different trajectories, i.e. if the universality of free fall guaranteed by the weak equivalence principle (WEP) is violated, they would experience an additional relative delay. This quantity, however, is not an observable on the background level as it is not gauge independent, which has led to confusion in previous papers. Instead, an imprint can be seen in the correlation between the time delays of different pulses. In this paper, we derive robust and consistent constraints from twelve localised FRBs on the violation of the WEP in the energy range between 4.6 and 6 meV. In contrast to a number of previous studies, we consider our signal to be not in the model, but in the covariance matrix of the likelihood. To do so, we calculate the covariance of the time delays induced by the free electrons in the LSS, the WEP breaking terms, the Milky Way and host galaxy. By marginalising over both host galaxy contribution and the contribution from the free electrons, we find that the parametrised post-Newtonian parameter γ characterising the WEP violation must be constant in this energy range to 1 in 10 13 at 68 % confidence. These are the tightest constraints to-date on ∆γ in this low energy range.

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Section: Comparison To Other Constraints On the Wepmentioning

confidence: 99%

Consistent Constraints on the Equivalence Principle from localised Fast Radio Bursts

Reischke¹,

Hagstotz²

2023

Preprint

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show abstract

“…Under reasonable assumptions about the value of the effect during the whole trajectory on a cosmological scale, much more tight limits can be derived. For example, in [86], the authors obtain ∆γ 10 −21 for FRBs beyond z = 1.…”

Section: Testing the Equivalence Principlementioning

confidence: 99%

Future of Neutron Star Studies with Fast Radio Bursts

Попов

Пширков

2023

Particles

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Fast radio bursts (FRBs) were discovered only in 2007. However, the number of known events and sources of repeating bursts grows very rapidly. In the near future, the number of events will be ≳104 and the number of repeaters ≳100. Presently, there is a consensus that most of the sources of FRBs might be neutron stars (NSs) with large magnetic fields. These objects might have different origin as suggested by studies of their host galaxies which represent a very diverse sample: from regions of very active star formation to old globular clusters. Thus, in the following decade we expect to have a very large sample of events directly related to extragalactic magnetars of different origin. This might open new possibilities to probe various aspects of NS physics. In the review we briefly discuss the main directions of such future studies and summarize our present knowledge about FRBs and their sources.

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Consistent constraints on the equivalence principle from localized fast radio bursts

Reischke

Hagstotz

2023

Monthly Notices of the Royal Astronomical Society

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Fast Radio Bursts (FRBs) are short astrophysical transients of extragalactic origin. Their burst signal is dispersed by the free electrons in the large-scale-structure (LSS), leading to delayed arrival times at different frequencies. Another potential source of time delay is the well known Shapiro delay, which measures the space-space and time-time metric perturbations along the line-of-sight. If photons of different frequencies follow different trajectories, i.e. if the universality of free fall guaranteed by the weak equivalence principle (WEP) is violated, they would experience an additional relative delay. This quantity, however, is not an observable on the background level as it is not gauge independent, which has led to confusion in previous papers. Instead, an imprint can be seen in the correlation between the time delays of different pulses. In this paper, we derive robust and consistent constraints from twelve localised FRBs on the violation of the WEP in the energy range between 4.6 and 6 meV. In contrast to a number of previous studies, we consider our signal to be not in the model, but in the covariance matrix of the likelihood. To do so, we calculate the covariance of the time delays induced by the free electrons in the LSS, the WEP breaking terms, the Milky Way and host galaxy. By marginalising over both host galaxy contribution and the contribution from the free electrons, we find that the parametrised post-Newtonian parameter γ characterising the WEP violation must be constant in this energy range to 1 in 1013 at 68 % confidence. These are the tightest constraints to-date on Δγ in this low energy range.

show abstract

Constraining violations of the weak equivalence principle Using CHIME FRBs

Cited by 3 publications

References 35 publications

Consistent Constraints on the Equivalence Principle from localised Fast Radio Bursts

Consistent Constraints on the Equivalence Principle from localised Fast Radio Bursts

Future of Neutron Star Studies with Fast Radio Bursts

Consistent constraints on the equivalence principle from localized fast radio bursts

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