Cosmology with gravitationally lensed repeating fast radio bursts

Wucknitz, O.; Spitler, Laura; Pen, Ue-Li

doi:10.1051/0004-6361/202038248

Cited by 44 publications

(44 citation statements)

References 61 publications

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“…Such observable can serve as a new probe of cosmic expansion [79] as well as for mitigating uncertainties from the mass distribution of the lens, as proposed and studied in Ref. [80]. This can improve the constraints from TDs from strongly-lensed FRB on screened MG theories with gravitational slip.…”

Section: Discussionmentioning

confidence: 93%

Probing Gravitational Slip with Strongly Lensed Fast Radio Bursts

Abadi,

Kovetz

2021

Preprint

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The rapid accumulation of observed Fast Radio Bursts (FRBs) originating from cosmological distances makes it likely that some will be strongly lensed by intervening matter along the line of sight. Detection of lensed FRB repeaters, which account for a noteworthy fraction of the total population, will allow not only an accurate measurement of the lensing time delay, but also follow-up high-resolution observations to pinpoint the location of the lensed images. Recent works proposed to use such strongly-lensed FRBs to derive constraints on the current expansion rate H0 as well as on cosmic curvature. Here we study the prospects for placing constraints on departures from general relativity via such systems. Using an ensemble of simulated events, we focus on the gravitational slip parameter γPN in screened modified gravity models and show that FRB time-delay measurements can yield constraints as tight as |γPN − 1| 0.04×(Λ/100kpc)×[N/10] −1/2 at 1σ with 10 detections.

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Section: Discussionmentioning

confidence: 93%

Probing Gravitational Slip with Strongly Lensed Fast Radio Bursts

Abadi,

Kovetz

2021

Preprint

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“…Although the implications of the MSD for lensed EM signals have been extensively studied, e.g. [21][22][23][24][25][58][59][60], the same is not true for lensed GWs. In this paper we have addressed this point.…”

Section: Discussionmentioning

confidence: 99%

Breaking the mass-sheet degeneracy with gravitational wave interference in lensed events

Cremonese,

Ezquiaga,

Salzano

2021

Preprint

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The mass-sheet degeneracy is a well-known problem in gravitational lensing which limits our capability to infer astrophysical lens properties or cosmological parameters from observations. As the number of gravitational wave observations grows, detecting lensed events will become more likely, and to assess how the mass-sheet degeneracy may affect them is crucial. Here we study both analytically and numerically how the lensed waveforms are affected by the mass-sheet degeneracy computing the amplification factor from the diffraction integral. In particular, we differentiate between the geometrical optics, wave optics and interference regimes, focusing on ground-based gravitational waves detectors. In agreement with expectations of gravitational lensing of electromagnetic radiation, we confirm how, in the geometrical optics scenario, the mass-sheet degeneracy cannot be broken with only one lensed image. However, we find that in the interference regime, and in part in the wave-optics regime, the mass-sheet degeneracy can be broken with only one lensed waveform thanks to the characteristic interference patterns of the signal. Finally, we quantify, through template matching, how well the mass-sheet degeneracy can be broken. We find that, within present GW detector sensitivities and considering signals as strong as those which have been detected so far, the mass-sheet degeneracy can lead to a 1σ uncertainty on the lens mass of ∼ 12%. With these values the MSD might still be a problematic issue. But in case of signals with higher signal-to-noise ratio, the uncertainty can drop to ∼ 2%, which is less than the current indeterminacy achieved by dynamical mass measurements.

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“…A conclusive test of lensing, however, will require high-resolution imaging. Liu et al (2019) and Wucknitz et al (2021) have examined the prospects for using lensing as cosmological probes. Considering a potential future sample of a few dozen repeating sources that exhibit strong lensing, Liu et al (2019) show that constraints on both H 0 and the equation of state of dark energy are possible.…”

Section: Gravitational Lensingmentioning

confidence: 99%

Fast radio bursts at the dawn of the 2020s

Petroff,

Hessels,

Lorimer

2021

Preprint

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Since the discovery of the first fast radio burst (FRB) in 2007, and their confirmation as an abundant extragalactic population in 2013, the study of these sources has expanded at an incredible rate. In our 2019 review on the subject we presented a growing, but still mysterious, population of FRBs -60 unique sources, 2 repeating FRBs, and only 1 identified host galaxy. However, in only a few short years new observations and discoveries have given us a wealth of information about these sources. The total FRB population now stands at over 600 published sources, 24 repeaters, and 14 host galaxies. Higher time resolution data, sustained monitoring, and better localisation tools have given us insight into repeaters, host galaxies, burst morphology, source activity, progenitor models, and the use of FRBs as cosmological probes. The recent detection of a bright FRBlike burst from Galactic magnetar SGR 1935+2154 provides an important link between FRBs and magnetars. There also continue to be surprising discoveries, like periodic activity from repeaters and the localisation of one FRB source to a relatively nearby globular cluster associated with the M81 galaxy. In this review, we summarise the exciting observational results from the past few years and their impact on our understanding of the FRB population and proposed progenitor models. We build on the introduction to FRBs in our earlier review, update our readers on recent results, and discuss interesting avenues for exploration as the field enters a new regime where hundreds to thousands of new FRBs will be discovered and reported each year.

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Cosmology with gravitationally lensed repeating fast radio bursts

Cited by 44 publications

References 61 publications

Probing Gravitational Slip with Strongly Lensed Fast Radio Bursts

Probing Gravitational Slip with Strongly Lensed Fast Radio Bursts

Breaking the mass-sheet degeneracy with gravitational wave interference in lensed events

Fast radio bursts at the dawn of the 2020s

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