Lorentz violation from cosmological objects with very high energy photon emissions

Shao, Lijing; Xiao, Zhi; Ma, Bo-Qiang

doi:10.1016/j.astropartphys.2010.03.003

Cited by 90 publications

(130 citation statements)

References 45 publications

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“…[76][77][78] for recent attempts of addressing anomalies in 2 + 1 dimensions), and to be in violation with current observations such as tests of Lorentz Invariance (LI). Stringent constraints on LI violation have been placed via observations of Gamma-Ray Bursts (GRB) by the FERMI Large Area Telescope, LAT [79], which is sensitive to MeV-to-GeV GRBs, and the Gamma-Ray Burst Monitor collaborations that use GRB 080916C [80] and GRB 090510 [81]. In addition, competitive results can be achieved by observations of flares of Active Galactive Nuclei by MAGIC, or the H.E.S.S.…”

Section: Loop Quantum Cosmologymentioning

confidence: 99%

A critical review of classical bouncing cosmologies

2015

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Given the proliferation of bouncing models in recent years, we gather and critically assess these proposals in a comprehensive review. The PLANCK data shows an unmistakably red, quasi scaleinvariant, purely adiabatic primordial power spectrum and no primary non-Gaussianities. While these observations are consistent with inflationary predictions, bouncing cosmologies aspire to provide an alternative framework to explain them. Such models face many problems, both of the purely theoretical kind, such as the necessity of violating the NEC and instabilities, and at the cosmological application level, as exemplified by the possible presence of shear. We provide a pedagogical introduction to these problems and also assess the fitness of different proposals with respect to the data. For example, many models predict a slightly blue spectrum and must be fine-tuned to generate a red spectral index; as a side effect, large non-Gaussianities often result.We highlight several promising attempts to violate the NEC without introducing dangerous instabilities at the classical and/or quantum level. If primordial gravitational waves are observed, certain bouncing cosmologies, such as the cyclic scenario, are in trouble, while others remain valid. We conclude that, while most bouncing cosmologies are far from providing an alternative to the inflationary paradigm, a handful of interesting proposals have surfaced, which warrant further research. The constraints and lessons learned as laid out in this review might guide future research.

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Section: Loop Quantum Cosmologymentioning

confidence: 99%

A critical review of classical bouncing cosmologies

2015

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“…The motivation of DSR theories is also derived from the observation of interesting effects such as deformation of dispersion relation etc. at very high energy scales [1,[4][5][6][7]. The introduction of an observer independent energy scale in DSR formulation, say κ, leads to such a modification in the dispersion relation of a free particle [1,2,8,9].…”

Section: Introductionmentioning

confidence: 99%

Equilibrium properties of blackbody radiation with an ultraviolet energy cut-off

2017

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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%

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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Lorentz violation from cosmological objects with very high energy photon emissions

Cited by 90 publications

References 45 publications

A critical review of classical bouncing cosmologies

A critical review of classical bouncing cosmologies

Equilibrium properties of blackbody radiation with an ultraviolet energy cut-off

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

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