Inverse compton testing of fundamental physics and the cosmic background radiation

Gurzadyan, V. G.; Margarian, A.T.

doi:10.1088/0031-8949/53/5/001

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…The kinematics of the Compton scattering defines the energy ω s of photons having scattered on the electrons of energy E e in dependence on the energy of the primary photon ω 0 as follows (e.g. [1])…”

Section: Compton Edgementioning

confidence: 99%

“…Then, as follows from Eqs. (4), (10)(11)(12), the position of the CE defines the light speed variation [1,2] [2,4]. For MM-test the crucial was the stability of the beam energy and tagging system, while the stability of the thermal expansion of the tagging system was a subject of a separate study (for details see [4] and also the discussion in [19]).…”

Section: The Compton Edge At Graal: the Light Speed In The Moving Elementioning

confidence: 99%

“…(a Among the experiments on the MM-test there were the measurements based on the idea of the daily monitoring of the Compton Edge (CE) which corresponds to the maximal energy of the scattered photons (see below), with respect to the frame of cosmic microwave background (CMB) as suggested in [1]. That idea has been realized at GRAAL experiment of the European Synchrotron Radiation Facility (ESRF, Grenoble) at the scattering of accelerated electrons of 6.03 GeV energy and laser monochromatic photons.…”

Section: Introductionmentioning

confidence: 99%

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The light speed versus the observer: the Kennedy–Thorndike test from GRAAL-ESRF

Gurzadyan

Margaryan

2018

Eur. Phys. J. C

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High precision tests of the light speed constancy for all observers as of empirical basis of the Special Relativity have continuously been among the goals of advanced experimental studies. Based on the Compton Edge method proposed by us [1], a constraint on the one-way light speed isotropy and the Lorentz invariance violation has been obtained at the dedicated GRAAL experiment at European Synchrotron Radiation Facility (ESRF, Grenoble) [2,3,4,5]. Using the GRAAL's data we now get a new constraint on one of key tests of Special Relativity -the Kennedy-Thorndike experiment [6]-in probing the light speed invariance with respect to the velocity of the observer (apparatus). Our analysis takes advantage of GRAAL's setup where two separate energy scales are involved: first, via the position of the Compton Edge determining the light speed in the reference frame of incident 6 GeV electrons within the tagging system, second, in the calorimeter via the 1.27 MeV photons of the 22 Na source. The two energy scales are engaged to each other through production of η mesons by tagged laser Compton backscattered γ-rays. Accuracy of the calibration and stability of energies reached in each section enable us to obtain the limit 7 10 −12 for the Kennedy-Thorndike test, which improves the currently existing limits by three orders of magnitude.

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Section: Compton Edgementioning

confidence: 99%

Section: The Compton Edge At Graal: the Light Speed In The Moving Elementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The light speed versus the observer: the Kennedy–Thorndike test from GRAAL-ESRF

Gurzadyan

Margaryan

2018

Eur. Phys. J. C

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“…In ref. [18] it has been proposed to test different quantities related to photon velocity by high energy Compton process measuring simultaneously the scattered photon and electron energies. However, this set of measurements is not sensitive to the photon speed which is accessible only from the photon energy and momentum combined information.…”

Section: Compton Scattering In Dispersive Vacuummentioning

confidence: 99%

Possible observation of photon speed energy dependence

Gharibyan

2005

Physics Letters B

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Current constraints on photon velocity variability are summarized and displayed in terms of an energy dependent vacuum refraction index. It is shown that the energy-momentum balance of high energy Compton scattering is very sensitive to the outgoing photon speed. A missing energy observation in HERA Compton polarimeter data indicates that photons with 12.7 GeV energy are moving faster than light by 5.1(1.4)mm/s. An asymmetry spectrum measured by the SLC longitudinal polarimeter implies however an effect which is 42 times smaller, although the interpretation of the data is less clear here.

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“…The experiments test isotropy of the maximum speed, but we refer to the speed of light assuming the photon to be massless. A recent experiment at the storage ring ESRF (Grenoble) established a stringent constraint on the speed of light anisotropy of 1.6 × 10 −14 using the Compton back-scattering method [3,4].…”

mentioning

confidence: 99%