Gamma-ray polarization constraints on Planck scale violations of special relativity

Maccione, Luca; Liberati, Stefano; Celotti, A.; Kirk, J. G.; Ubertini, P.

doi:10.22323/1.078.0018

Cited by 7 publications

(11 citation statements)

References 21 publications

(40 reference statements)

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“…Localization of the Hawking radiation was again addressed in [563], while sensitivity of the Hawking flux to the presence of superluminal dispersion was considered in [33]. Astrophysical constraints on modified dispersion relations were again considered in [408,410], while applications to quark matter were investigated in [415,417]. Possible applications to high-temperature superconductivity were reported in [444].…”

Section: The Year 2008mentioning

confidence: 99%

Analogue Gravity

Barceló

Liberati

Visser

2011

Living Rev. Relativ.

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736

1,080

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Analogue gravity is a research programme which investigates analogues of general relativistic gravitational fields within other physical systems, typically but not exclusively condensed matter systems, with the aim of gaining new insights into their corresponding problems. Analogue models of (and for) gravity have a long and distinguished history dating back to the earliest years of general relativity. In this review article we will discuss the history, aims, results, and future prospects for the various analogue models. We start the discussion by presenting a particularly simple example of an analogue model, before exploring the rich history and complex tapestry of models discussed in the literature. The last decade in particular has seen a remarkable and sustained development of analogue gravity ideas, leading to some hundreds of published articles, a workshop, two books, and this review article. Future prospects for the analogue gravity programme also look promising, both on the experimental front (where technology is rapidly advancing) and on the theoretical front (where variants of analogue models can be used as a springboard for radical attacks on the problem of quantum gravity).

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Section: The Year 2008mentioning

confidence: 99%

Analogue Gravity

Barceló

Liberati

Visser

2011

Living Rev. Relativ.

Self Cite

736

1,080

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“…Polarization detected by INTEGRAL in the high energy photons produced close to the Crab Pulsar (as described in a previous section) has been used to derive an upper limit proving the absence of vacuum birefringence effects in photon propagation, in turn constraining the Lorentz Invariance Violation (LIV) in Quantum Electro Dynamics (Maccione et al, 2008). This unprecedented limit was correlated to the parameter |ξ| < 9 × 10 -10 , derived from the INTEGRAL data with an accuracy 3 orders of magnitude better than before.…”

Section: Gamma-ray Burstsmentioning

confidence: 99%

INTEGRAL: Science Highlights and Future Prospects

et al. 2011

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ESA's hard X-ray and soft gamma-ray observatory INTEGRAL is covering the 3 keV to 10 MeV energy band, with excellent sensitivity during long and uninterrupted observations of a large field of view (∼ 100 square degrees), with ms time resolution and keV energy resolution. It links the energy band of pointed soft X-ray missions such as XMMNewton with that of high-energy gamma-ray space missions such as Fermi and ground based TeV observatories. Key results obtained so far include the first sky map in the light of the 511 keV annihilation emission, the discovery of a new class of high mass X-ray binaries and detection of polarization in cosmic high energy radiation. For the foreseeable future, INTE-GRAL will remain the only observatory allowing the study of nucleosynthesis in our Galaxy, including the long overdue next nearby supernova, through high-resolution gamma-ray line spectroscopy. Science results to date and expected for the coming mission years span a wide range of high-energy astrophysics, including studies of the distribution of positrons in the Galaxy; reflection of gamma-rays off clouds in the interstellar medium near the Galactic Centre; studies of black holes and neutron stars particularly in high-mass systems; gamma-INTEGRAL: The International Gamma-Ray Astrophysics Laboratory, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: 150 C. Winkler et al. ray polarization measurements for X-ray binaries and gamma-ray bursts, and sensitive detection capabilities for obscured active galaxies with more than 1000 expected to be found until 2014. This paper summarizes scientific highlights obtained since INTEGRAL's launch in 2002, and outlines prospects for the INTEGRAL mission.

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“…where dots over variables represent derivatives of the indicated variables with the time coordinate. And after recovering c in inequality (17), one ends in units of time with:…”

Section:  𝑔mentioning

confidence: 99%

“…Likewise, other quantum gravity theories such as string theory also introduce ℓ as a fundamental length element for particles [10][11][12]. Most quantum gravity theories predict phenomena such as in vacuo dispersion of photons and neutrinos, and deviations of photon polarization over astronomical distances caused by Lorentz invariance violations (LIV) [13][14][15][16][17][18]. These phenomena are predicted to arise if indeed the space-time is discreet.…”

Section: Introductionmentioning

confidence: 99%

Covariant Space-Time Line Elements in the Friedmann-Lemaitre-Robertson-Walker Geometry

Escors¹,

Kochan²

2021

Preprint

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Most quantum gravity theories endow space-time with a discreet nature by space quantization on the order of Planck length (lp ). This discreetness could be demonstrated by confirmation of Lorentz invariance violations (LIV) manifested at length scales proportional to lp. In this paper, space-time line elements compatible with the uncertainty principle are calculated for a homogeneous, isotropic expanding Universe represented by the Friedmann-Lemaitre-Robertson-Walker solution to General Relativity (FLRW or FRW metric). To achieve this, the covariant geometric uncertainty principle (GeUP) is applied as a constraint over geodesics in FRW geometries. A generic expression for the quadratic proper space-time line element is derived, proportional to Planck length-squared and dependent on two contributions. The first is associated to the energy-time uncertainty, and the second depends on the Hubble function. The results are in agreement with space-time quantization on the expected length orders, according to quantum gravity theories and experimental constraints on LIV.

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Gamma-ray polarization constraints on Planck scale violations of special relativity

Cited by 7 publications

References 21 publications

Analogue Gravity

Analogue Gravity

INTEGRAL: Science Highlights and Future Prospects

Covariant Space-Time Line Elements in the Friedmann-Lemaitre-Robertson-Walker Geometry

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