Probes of Lorentz violation

Ellis, John; Mavromatos, Nick E.

doi:10.1016/j.astropartphys.2012.05.004

Cited by 64 publications

(60 citation statements)

References 68 publications

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“…The upcoming Cherenkov Telescope Array (CTA; Acharya et al 2013) and its precursors, such as the proposed ASTRI/CTA mini array (Di Pierro et al 2013), will greatly improve the sensitivity above 10 TeV, and provide ideal instruments to probe and constrain LIV scenarios 1 . The search for LIV effects based on the modification of the cosmic opacity is complementary to the method based on measuring energy-dependent photon time of flight from cosmic sources (Amelino-Camelia et al 1998;Ellis & Mavromatos 2013). These were recently applied to GRB and blazars and already provide interesting lower limits for the LIV energy scale of photons, E LIV > 9.3 × 10…”

Section: Introductionmentioning

confidence: 99%

On the detectability of Lorentz invariance violation through anomalies in the multi-TeVγ-ray spectra of blazars

Tavecchio

Bonnoli

2015

A&A

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Context. Cosmic opacity for very high energy γ rays (E > 10 TeV) that result from the interaction with the extragalactic background light can be strongly reduced. This is because of possible Lorentz-violating terms in the dispersion relations for particles expected for several versions of quantum gravity theories. Aims. We discuss the possibility of using very high-energy observations of blazars to detect anomalies in the cosmic opacity that are induced by Lorentz invariance violation (LIV), taking the possibility of using extreme BL Lacertae (BL Lac) objects into particular consideration, as well as the bright and nearby BL Lac Mkn 501. Methods. We derive the modified expression for the optical depth of γ rays by also taking redshift dependence into consideration and, by applying this, we derive the expected high-energy spectrum above 10 TeV of Mkn 501, in high and low states, and of the extreme BL Lac 1ES 0229+200. Results. Along with the nearby and well studied BL Lac Mkn 501 especially in high state, other suitable targets are extreme BL Lac objects, characterized by quite hard TeV intrinsic spectra which probably extend at the energies relevant when detecting LIV features.

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Section: Introductionmentioning

confidence: 99%

On the detectability of Lorentz invariance violation through anomalies in the multi-TeVγ-ray spectra of blazars

Tavecchio

Bonnoli

2015

A&A

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“…In these models, Lorentz invariance is expected to be broken at very high energies close to the Planck scale, and the speed of light is dependent on the energy of the associated photon [5]. Although many astrophysical sources such as AGNs [6,7], pulsars [8] etc. have been used to search for LIV-induced light speed variation, most of these searches have been done with Gamma-Ray Bursts (GRBs)(See [9][10][11][12][13][14][15][16] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Statistical significance of spectral lag transition in GRB 160625B

Ganguly

Desai

2017

Astroparticle Physics

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Recently Wei et al [1] have found evidence for a transition from positive time lags to negative time lags in the spectral lag data of GRB 160625B. They have fit these observed lags to a sum of two components: an assumed functional form for intrinsic time lag due to astrophysical mechanisms and an energy-dependent speed of light due to quadratic and linear Lorentz invariance violation (LIV) models. Here, we examine the statistical significance of the evidence for a transition to negative time lags. Such a transition, even if present in GRB 160625B, cannot be due to an energy dependent speed of light as this would contradict previous limits by some 3-4 orders of magnitude, and must therefore be of intrinsic astrophysical origin. We use three different model comparison techniques: a frequentist test and two information based criteria (AIC and BIC). From the frequentist model comparison test, we find that the evidence for transition in the spectral lag data is favored at 3.05σ and 3.74σ for the linear and quadratic models respectively. We find that ∆AIC and ∆BIC have values 10 for the spectral lag transition that was motivated as being due to quadratic Lorentz invariance violating model pointing to "decisive evidence". We note however that none of the three models (including the model of intrinsic astrophysical emission) provide a good fit to the data.

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“…In the past, various limits on LIV have been obtained from the spectral time lags of individual GRB or a large sample of GRBs (e.g., Amelino-Camelia et al 1998;Coleman & Glashow 1999;Schaefer 1999;Ellis et al 2003Ellis et al , 2006Boggs et al 2004;Kahniashvili et al 2006;Jacob & Piran 2008;Abdo et al 2009a,b;Biesiada & Piórkowska 2009;Xiao & Ma 2009;Shao et al 2010;Chang et al 2012Chang et al , 2016Nemiroff et al 2012;Ellis & Mavromatos 2013;Kostelecký & Mewes 2013;Vasileiou et al 2013Vasileiou et al , 2015Pan et al 2015;Zhang & Ma 2015;Wei et al 2016). In particular, Abdo et al (2009a) used the time lag of the highest energy (13.2 GeV) photon from GRB 080916C to constrain the linear LIV energy scale (E QG,1 ) and presented a stringent limit of 1.3 × 10 18 GeV, improving the previous limits by at least one order of magnitude.…”

Section: Introductionmentioning

confidence: 99%

“…In such cases, the speed of light in vacuum would depend on the energy of the photon, and high energy photons propagate in vacuum slower than low energy photons (Amelino-Camelia et al 1998). The energy scale for LIV, E QG , could therefore be constrained by the arrival time differences of the photons with different energies originating from the same astronomical source (Amelino-Camelia et al 1998;Ellis & Mavromatos 2013).…”

Section: Introductionmentioning

confidence: 99%

A New Test of Lorentz Invariance Violation: The Spectral Lag Transition of GRB 160625B

Wei

Zhang

Shao

et al. 2017

ApJL

121

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Possible violations of Lorentz invariance (LIV) have been investigated for a long time using the observed spectral lags of gamma-ray bursts (GRBs). However, these generally have relied on using a single photon in the highest energy range. Furthermore, the search for LIV lags has been hindered by our ignorance concerning the intrinsic time lag in different energy bands. GRB 160625B, the only burst so far with a well-defined transition from positive lags to negative lags provides a unique opportunity to put new constraints on LIV. Using multiphoton energy bands we consider the contributions to the observed spectral lag from both the intrinsic time lag and the lag by LIV effects, and assuming the intrinsic time lag to have a positive dependence on the photon energy, we obtain robust limits on LIV by directly fitting the spectral lag data of GRB 160625B. Here we show that these robust limits on the quantum gravity energy scales are E QG,1 ≥ 0.5 × 10 16 GeV for the linear, and E QG,2 ≥ 1.4 × 10 7 GeV for the quadratic LIV effects, respectively. In addition, we give for the first time a reasonable formulation of the intrinsic energy-dependent time lag.

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Probes of Lorentz violation

Cited by 64 publications

References 68 publications

On the detectability of Lorentz invariance violation through anomalies in the multi-TeVγ-ray spectra of blazars

On the detectability of Lorentz invariance violation through anomalies in the multi-TeVγ-ray spectra of blazars

Statistical significance of spectral lag transition in GRB 160625B

A New Test of Lorentz Invariance Violation: The Spectral Lag Transition of GRB 160625B

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