Inspecting absorption in the spectra of extra-galactic gamma-ray sources for insight into Lorentz invariance violation

Jacob, Uri; Piran, Tsvi

doi:10.1103/physrevd.78.124010

Cited by 60 publications

(76 citation statements)

References 33 publications

(43 reference statements)

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“…where ΔE is the difference between the low and high photon energy and M QG is the quantum-gravity mass (A09; Amelino-Camelia et al 1998;Jacob & Piran 2008). For a delay of 0.15 s we derive M QG > 6.7M Planck , while the more conservative limit (delay of 0.217 s) is M QG > 4.7M Planck (we used h 0 = 0.71, Ω Λ = 0.73, Ω M = 0.27).…”

Section: Test Of the Lorentz-invariance Violationmentioning

confidence: 99%

The onset of the GeV afterglow of GRB 090510

Ghirlanda¹,

Ghisellini²,

Nava

2010

A&A

117

142

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We study the emission of the short/hard Gamma Ray Burst 090510 at energies >0.1 GeV as observed by the Large Area Telescope (LAT) onboard the Fermi satellite. The GeV flux rises in time as t 2 up till 0.2 s after the peak of the MeV pulse detected by the Fermi Gamma Burst Monitor (GBM) after which it decays as t −1.5 up to 200 s. Its energy spectrum is consistent with F(ν) ∝ ν −1 . The time behavior and the spectrum of the high energy LAT flux are strong evidences of an afterglow origin. We then interpret it as synchrotron radiation produced by the forward shock of a fireball with a bulk Lorentz factor Γ ∼ 2000. The afterglow peak time is independent of energy in the 0.1-30 GeV range and coincides with the arrival time of the highest energy photon (∼ 30 GeV). Since the flux detected by the GBM and the LAT have different origins, the delay between these two components is not entirely due to possible violation of the Lorentz invariance. The LAT component alone allows us to set a reliable lower limit on the quantum-gravity mass of 4.7 times the Planck mass.

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Section: Test Of the Lorentz-invariance Violationmentioning

confidence: 99%

The onset of the GeV afterglow of GRB 090510

Ghirlanda¹,

Ghisellini²,

Nava

2010

A&A

117

142

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“…In this paper we extend their treatment to include the redshift dependence of the EBL and we compare this treatment to the one previously presented by Jacob & Piran (2008). We further proceed to discuss the targets most suitable for this study and propose that LIV effects could be constrained effectively through deep observations of the so-called extreme BL Lacs (EHBL; e.g.…”

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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“…Beyond the interest in the EBL per se, this is particularly relevant for the study of potential second-order processes in the propagation of γ rays over cosmological distances. These include conversion into axion-like particles (e.g., Sanchez-Conde et al 2009;Abramowski et al 2013a), Lorentz invariance violation (e.g., Stecker & Glashow 2001;Jacob & Piran 2008), or cascade emission in extragalactic magnetic fields (e.g., Aharonian et al 1994;Taylor et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Measurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars

Abdalla¹,

Abramowski²,

Aharonian³

et al. 2017

A&A

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Very high-energy γ rays (VHE, E 100 GeV) propagating over cosmological distances can interact with the low-energy photons of the extragalactic background light (EBL) and produce electron-positron pairs. The transparency of the Universe to VHE γ rays is then directly related to the spectral energy distribution (SED) of the EBL. The observation of features in the VHE energy spectra of extragalactic sources allows the EBL to be measured, which otherwise is very difficult. An EBL model-independent measurement of the EBL SED with the H.E.S.S. array of Cherenkov telescopes is presented. It was obtained by extracting the EBL absorption signal from the reanalysis of high-quality spectra of blazars. From H.E.S.S. data alone the EBL signature is detected at a significance of 9.5σ, and the intensity of the EBL obtained in different spectral bands is presented together with the associated γ-ray horizon.

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Inspecting absorption in the spectra of extra-galactic gamma-ray sources for insight into Lorentz invariance violation

Cited by 60 publications

References 33 publications

The onset of the GeV afterglow of GRB 090510

The onset of the GeV afterglow of GRB 090510

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

Measurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars

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