Secular Motions of Extragalactic Radio-Sources and the Stability of the Radio Reference Frame

Eubanks, T. M.; Matsakis, Demetrios; Josties, F. J.; Archinal, B. A.; Kingham, K. A.; Martin, Jim; McCarthy, Dennis D.; Herring, T. A.

doi:10.1007/978-94-011-0069-4_45

Cited by 13 publications

(10 citation statements)

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“…ω > 5 × 10 4 is supported value in some literature [10]. The light deflection as measured by Very Long Baseline Interferometry [11] gives the information…”

Section: Introductionsupporting

confidence: 60%

Constraining red-shift parametrization parameters in Brans-Dicke theory: evolution of open confidence contours

Biswas

Debnath

2014

Astrophys Space Sci

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In Brans Dicke theory of gravity, from the nature of the scalar field-potential considered, the dark energy, dark matter, radiation densities predicted by different observations and the closedness of the universe considered, we can fix our ω BD , the Brans Dicke parameter, keeping only the thing in mind that from different solar system constrains it must be greater than 5 × 10 5 . Once we have a value, satisfying the required lower boundary, in our hand we proceed for setting unknown parameters of the different dark energy models' EoS parameter. In this paper we work with three well known red shift parametrizations of dark energy EoS. To constrain their free parameters for Brans Dicke theory of gravity we take twelve point red shift vs Hubble's parameter data and perform χ 2 test. We present the observational data analysis mechanism for Stern, Stern+BAO and Stern+BAO+CMB observations. Minimising χ 2 , we obtain the best fit values and draw different confidence contours. We analyze the contours physically. Also we examine the best fit of distance modulus for our theoretical models and the Supernovae Type Ia Union2 sample. For Brans Dicke theory of gravity the difference from the mainstream confidence contouring method of data analysis id that the confidence contours evolved are not at all closed contours like a circle or a ellipse. Rather they are found to be open contours allowing the free parameters to float inside a infinite region of parameter space. However, negative EoSs are likely to evolve from the best fit values.

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“…ω > 5 × 10 4 is supported value in some literature [10]. The light deflection as measured by Very Long Baseline Interferometry [11] gives the information…”

Section: Introductionsupporting

confidence: 60%

Constraining red-shift parametrization parameters in Brans-Dicke theory: evolution of open confidence contours

Biswas

Debnath

2014

Astrophys Space Sci

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“…Physical meanings and most of the solar-system references are taken from the compilations by Will [ 147 ]. References: γ PPN , solar system: [ 51 ]; β, solar system: [ 118 ]; ξ, solar system: [ 105 ]; α 1 , solar system: [ 95 ], pulsar: [ 146 ]; α 2 , solar system: [ 105, 152 ]; α 3 , solar system: [ 152 ], pulsar: [ 146 ]; ζ 2 , pulsar: [ 149 ]; ζ 3 , solar system: [ 15, 152 ]; η, Δ net , solar system: [ 45 ], pulsar: [ 146 ]; , pulsar: [ 6 ]; Ġ/G , solar system: [ 45, 115, 59 ], pulsar: [ 135 ] .ParameterPhysical meaningSolar-system testLimitPulsar testLimit γ PPN Space curvature produced by unit rest massVLBI, light deflection; measures | γ PPN −1|3×10 -4 β Non-linearity in superposition law for gravityPerihelion shift of Mercury; measures | β −1|3×10 -3 ξ Preferred-location effectsSolar alignment with ecliptic4×10 -7 α 1 Preferred-frame effectsLunar laser ranging10 -4 Ensemble of binary pulsars1.4×10 -4 α 2 Preferred-frame effectsSolar alignment with ecliptic4×10 -7 α 3 Preferred-frame effects and nonconservation of momentumPerihelion shift of Earth and Mercury2×10 -7 Ensemble of binary pulsars1.5×10 -19 ζ 1 Non-conservation of momentumCombined PPN limits2×10 -2 ζ 2 Non-conservation of momentumLimit on P̈ for PSR B1913+164×10 -5 ζ 3 Non-conservation of momentumLunar acceleration10 -8 ζ 4 Non-conservation of momentumNot independent η , Δ net Gravitational Stark effectLunar laser ranging10 -3 Ensemble of binary pulsars9×10 -3 Pulsar...…”

Section: Tests Of Gr — Equivalence Principle Violationsmentioning

confidence: 99%

Testing General Relativity with Pulsar Timing

Stairs

2003

Living Rev. Relativ.

433

456

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Pulsars of very different types, including isolated objects and binaries (with short- and long-period orbits, and white-dwarf and neutron-star companions) provide the means to test both the predictions of general relativity and the viability of alternate theories of gravity. This article presents an overview of pulsars, then discusses the current status of and future prospects for tests of equivalence-principle violations and strong-field gravitational experiments.

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“…on possible fractional deviations from General Relativity). The best current limits come from: (i) VLBI measurements of the deflection of radio waves by the Sun, giving [13]: −3.8 × 10 −4 < γ < 2.6 × 10 −4 , and (ii) Lunar Laser Ranging measurements of a possible polarization of the orbit of the Moon toward the Sun ("Nordtvedt effect" [14]) giving [7]:…”

Section: Tests Of the Dynamics Of The Gravitational Field In The Weak...mentioning

confidence: 99%

Experimental tests of relativistic gravity

Damour

2000

Nuclear Physics B - Proceedings Supplements

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The confrontation between Einstein's gravitation theory and experimental results, notably binary pulsar data, is summarized and its significance discussed. Experiment and theory agree at the 10 −3 level or better. All the basic structures of Einstein's theory (coupling of gravity to matter; propagation and self-interaction of the gravitational field, including in strong-field conditions) have been verified. However, the theoretical possibility that scalar couplings be naturally driven toward zero by the cosmological expansion suggests that the present agreement between Einstein's theory and experiment might be compatible with the existence of a long-range scalar contribution to gravity (such as the dilaton field, or a moduli field, of string theory). This provides a new theoretical paradigm, and new motivations for improving the experimental tests of gravity.

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Secular Motions of Extragalactic Radio-Sources and the Stability of the Radio Reference Frame

Cited by 13 publications

References 0 publications

Constraining red-shift parametrization parameters in Brans-Dicke theory: evolution of open confidence contours

Constraining red-shift parametrization parameters in Brans-Dicke theory: evolution of open confidence contours

Testing General Relativity with Pulsar Timing

Experimental tests of relativistic gravity

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