Limits on the Weak Equivalence Principle and Photon Mass with FRB 121102 Subpulses

Xing, Nan; Gao, He; Wei, Junjie; Li, Zheng‐Xiang; Wang, Weiyang; Zhang, Bing; Wu, Xue-Feng; Mészáros, P.

doi:10.3847/2041-8213/ab3c5f

Cited by 38 publications

(51 citation statements)

References 84 publications

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“…Thirdly, the massive photon group velocity differs from c by a quantity proportional to the inverse of the frequency squared [9][10][11]23]. Such a dependence has been analysed recently with the signals from Fast Radio Bursts (FRBs) [79][80][81][82][83][84][85][86][87][88].…”

Section: Time Dilation and Supernovaementioning

confidence: 99%

Cosmology and the massive photon frequency shift in the Standard-Model Extension

et al. 2021

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The total red shift z might be recast as a combination of the expansion red shift and a static shift due to the energy–momentum tensor non-conservation of a photon propagating through Electro-Magnetic (EM) fields. If massive, the photon may be described by the de Broglie–Proca (dBP) theory which satisfies the Lorentz(-Poincaré) Symmetry (LoSy) but not gauge-invariance. The latter is regained in the Standard-Model Extension (SME), associated with LoSy Violation (LSV) that naturally dresses photons of a mass. The non-conservation stems from the vacuum expectation value of the vector and tensor LSV fields. The final colour (red or blue) and size of the static shift depend on the orientations and strength of the LSV and EM multiple fields encountered along the path of the photon. Turning to cosmology, for a zero $$\Omega _{\Lambda }$$ Ω Λ energy density, the discrepancy between luminosity and red shift distances of SNeIa disappears thanks to the recasting of z. Massive photons induce an effective dark energy acting ‘optically’ but not dynamically.

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Section: Time Dilation and Supernovaementioning

confidence: 99%

Cosmology and the massive photon frequency shift in the Standard-Model Extension

et al. 2021

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“…We aim to find the constraint on Δ𝛾. According to our understanding from various previous studies (Tingay & Kaplan 2016;Nusser 2016;Xing et al 2019;Bartlett et al 2021;Li et al 2021;Yang et al 2020;Tangmatitham & Nemiroff 2019), we can only consider the upper limit of Δ𝛾 value to mark a constraint which essentially indicates an upper limit of the violation of WEP. According to our calculation from Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…If both the violation of WEP and Δ𝑡 DM show an equivalent dependence on 𝜈 −2 obs , the two effects are not distinguishable (Ioka 2003;Macquart et al 2020;Inoue 2004). Until now, current studies of FRBs or any other sources have not found any such violation due to frequency (Einstein 1908;Tingay & Kaplan 2016;Nusser 2016;Minazzoli et al 2019a;Xing et al 2019).…”

Section: Theoretical Modelmentioning

confidence: 97%

Constraining violations of the Weak Equivalence Principle Using CHIME FRBs

Sen,

Hashimoto,

Goto

et al. 2021

Preprint

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Einstein's General Relativity (GR) is the basis of modern astronomy and astrophysics. Testing the validity of basic assumptions of GR is important. In this work, we test a possible violation of the Weak Equivalence Principle (WEP), i.e., there might be a time-lag between photons of different frequencies caused by the effect of gravitational fields if the speeds of photons are slightly different at different frequencies. We use Fast Radio Bursts (FRBs) , which are astronomical transients with millisecond timescales detected in the radio frequency range. Being at cosmological distances, accumulated time delay of FRBs can be caused by the plasma in between an FRB source and an observer, and by gravitational fields in the path of the signal. We segregate the delay due to dispersion and gravitational field using the post-Newtonian formalism (PPN) parameter Δ𝛾, which defines the space-curvature due to gravity by a unit test mass. We did not detect any time-delay from FRBs but obtained tight constraints on the upper limit of Δ𝛾. For FRB20181117C with 𝑧 = 1.83 ± 0.28 and 𝜈 𝑜𝑏𝑠 = 676.5 MHz, the best possible constraint is obtained at log(Δ𝛾) = −21.58 +0.10 −0.12 and log(Δ𝛾/𝑟 E ) = −21.75 +0.10 −0.14 , respectively, where 𝑟 E is the energy ratio of two photons of the same FRB signal. This constraint is about one order of magnitude better than the previous constraint obtained with FRBs, and five orders tighter than any constraint obtained using other cosmological sources.

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“…Calculating the difference of the γ value between different particles ∆γ can constrain the accuracy of the EEP. Now, the extragalactic transients have been used to the constrains on EEP or Einstein's Weak Equivalence Principle (WEP) [268][269][270][271][272].…”

Section: Weak Equivalence Principlementioning

confidence: 99%

The physics of fast radio bursts

Xiao

Wang

Dai

2021

Sci. China Phys. Mech. Astron.

124

102

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In 2007, a very bright radio pulse was identified in the archival data of the Parkes Telescope in Australia, marking the beginning of a new research branch in astrophysics. In 2013, this kind of millisecond bursts with extremely high brightness temperature takes a unified name, fast radio burst (FRB). Over the first few years, FRBs seemed very mysterious because the sample of known events was limited. With the improvement of instruments over the last five years, hundreds of new FRBs have been discovered. The field is now undergoing a revolution and understanding of FRB has rapidly increased as new observational data increasingly accumulate. In this review, we will summarize the basic physics of FRBs and discuss the current research progress in this area. We have tried to cover a wide range of FRB topics, including the observational property, propagation effect, population study, radiation mechanism, source model, and application in cosmology. A framework based on the latest observational facts is now under construction. In the near future, this exciting field is expected to make significant breakthroughs. fast radio burst, neutron star, cosmology

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Limits on the Weak Equivalence Principle and Photon Mass with FRB 121102 Subpulses

Cited by 38 publications

References 84 publications

Cosmology and the massive photon frequency shift in the Standard-Model Extension

Cosmology and the massive photon frequency shift in the Standard-Model Extension

Constraining violations of the Weak Equivalence Principle Using CHIME FRBs

The physics of fast radio bursts

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