Design and characteristics of a WEP test in a sounding-rocket payload

Reasenberg, R. D.; Patla, Biju R.; Phillips, James D.; Thapa, Rajesh

doi:10.1088/0264-9381/29/18/184013

Cited by 39 publications

(25 citation statements)

References 31 publications

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“…This is the same as the equivalence between active gravitational and passive inertial masses, which has been later accurately tested in many experiments [37], [38], but there is no direct mathematical derivation to this principle apart from the famous spacecraft accelerator thought experiment which relies on induction.…”

Section: The Equivalence Principlementioning

confidence: 94%

Duality of Time and Perpetual Re-creation of Space

Yousef¹

2017

Preprint

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Based on the Duality of Time hypothesis, a dynamic, granular and self-contained space-time is introduced and investigated. A new time-time or complex-time Euclidean space is defined and it is shown that the non-Euclidean Minkowski space is the first global approximation of this complex-time space in which the space-time interval becomes invariant between different inertial and non-inertial frames alike. Therefore, in addition to Lorentz factor, the equivalence principle is derived directly from the resulting discrete symmetry. To support this hypothesis, it will be applied to derive the mass-energy equivalence relation directly from fundamental classical principles. It will be also shown that the resulting dynamic quintessence could diminish the cosmological constant discrepancy by 117 orders of magnitude.

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Section: The Equivalence Principlementioning

confidence: 94%

Duality of Time and Perpetual Re-creation of Space

Yousef¹

2017

Preprint

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“…7 For overlapped interferometer beams as in our case, the optimal open fractions have been shown to be (0.60, 0.43, 0.37) [48], which can feasibly be fabricated in our proposed approach. developed for other equivalence-principle tests [59][60][61]. These employ Pound-Drever-Hall locking [62] of a laser to the length of an interferometer (which can be nonresonant or resonant, i.e., a cavity), such that small changes in length are translated into shifts of a laser frequency.…”

Section: Interferometermentioning

confidence: 99%

Studying Antimatter Gravity with Muonium

Antognini

Kaplan

Kirch

et al. 2018

Atoms

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The gravitational acceleration of antimatter,ḡ, has yet to be directly measured; an unexpected outcome of its measurement could change our understanding of gravity, the universe, and the possibility of a fifth force. Three avenues are apparent for such a measurement: antihydrogen, positronium, and muonium, the last requiring a precision atom interferometer and novel muonium beam under development. The interferometer and its few-picometer alignment and calibration systems appear feasible. With 100 nm grating pitch, measurements ofḡ to 10%, 1%, or better can be envisioned. These could constitute the first gravitational measurements of leptonic matter, of 2 nd -generation matter, and possibly, of antimatter.And we note that arguments based on absolute gravitational potentials have been critiqued by Nieto and Goldman [2].Atoms 2018, xx, x 2 of 14 on quite general grounds [2]. 2 Such a measurement can be viewed as a test of general relativity or as a search for a fifth force and is of interest from both perspectives.Although the equivalence principle experiments indicate that nuclear binding energy gravitates in the same way as ordinary mass, absent validated models of gravity at a subnuclear scale, it is unclear how the gravitational interactions of virtual matter should be treated. Use of a pure-leptonic atom, such as positronium or muonium, evades these complexities. Moreover, no measurement has yet been made of the gravitational force on second-or third-generation matter or antimatter (although, with some assumptions, stringent limits can be obtained from neutral-meson oscillations, especially for K 0 -K 0 [14]). Since direct gravitational measurements on other higher-generation particles, such as hyperons, τ leptons, and c or b hadrons, appear impractical due to their short lifetimes, muonium may be the only access we have. Recent work [15][16][17] examining a possible standard-model extension emphasizes the importance of second-generation gravitational measurements. Current interest in "fifth force" models [18,19] (stimulated by evident anomalies in the leptonic decays of B mesons) also supports more detailed investigations of muonium.General relativity (GR) is generally taken to predict identical behaviors of antimatter and matter in a gravitational field. With the observation of gravitational waves [20], most of the predictions of GR are now experimentally confirmed. Nevertheless, GR is fundamentally incompatible with quantum mechanics, and the search for a quantum theory of gravity continues [21]. To date, the experimental evidence on which to base such a theory comes from observations of matter-matter and matter-light interactions. In a quantum field theory, matter-matter and matter-antimatter forces can differ -for example, suppressed scalar and vector terms might cancel in matter-matter interactions, but add in matter-antimatter ones [2], leading to small equivalence principle violations. Matter-antimatter measurements could thus play a key role.While most physicists expect that the equivalence principle a...

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“…These bounds can be lowered further in future experiments such as the SR-POEM project [32] in 2016, which should reach an accuracy of ∆a/a = 2 × 10 −17 . Thus, it might actually detect the effect of rainbow functions, or constrain their parameters to the order unity.…”

Section: The Weak Equivalence Principlementioning

confidence: 99%

A proposal for testing gravity's rainbow

Ali

Khalil

2015

EPL

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Various approaches to quantum gravity such as string theory, loop quantum gravity and HoravaLifshitz gravity predict modifications of the energy-momentum dispersion relation. Magueijo and Smolin incorporated the modified dispersion relation (MDR) with the general theory of relativity to yield a theory of gravity's rainbow. In this paper, we investigate the Schwarzschild metric in the context of gravity's rainbow. We investigate rainbow functions from three known modified dispersion relations that were introduced by and by MagueijoSmolin in [4]. We study the effect of the rainbow functions on the deflection of light, photon time delay, gravitational red-shift, and the weak equivalence principle. We compare our results with experiments to obtain upper bounds on the parameters of the rainbow functions.

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Design and characteristics of a WEP test in a sounding-rocket payload

Cited by 39 publications

References 31 publications

Duality of Time and Perpetual Re-creation of Space

Duality of Time and Perpetual Re-creation of Space

Studying Antimatter Gravity with Muonium

A proposal for testing gravity's rainbow

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