The STEP mission: principles and baseline design

Mester, John; Torii, R.; Worden, P.; Lockerbie, N. A.; Vitale, S.; Everitt, C. W. F.

doi:10.1088/0264-9381/18/13/310

Cited by 79 publications

(74 citation statements)

References 10 publications

(7 reference statements)

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“…This is timely as there are currently four satellite experiments either in the proposal stage or due to be launched shortly (SEE [53], STEP [54], GG [55] and MICROSCOPE [56]). A reasonably sized region of the parameter space of the chameleon theories considered here will be visible to these missions.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…As a result, space-based searches for WEP violation will not detect any violation at a level that is already ruled by lab-based tests for n ≤ −4 theories. Planned space-based tests such as STEP [54], SEE [53], GG [55] and MICROSCOPE [56] promise a much greater precisions than their lab-based counterparts. MICROSCOPE is due to be launched in 2007.…”

Section: Laboratory Constraintsmentioning

confidence: 99%

“…In each plot, the whole of the shaded area indicates the allowed values of M and β (or λ and β). Three satellite experiments (SEE [53], STEP [54] and GG [55]) are currently in the proposal stage, whilst a fourth one (MICROSCOPE [56]) will be launched in 2007. These experiments will be able to detect WEP violations down to η = 10 −18 .…”

Section: Combined Bounds On Chameleon Theoriesmentioning

confidence: 99%

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Evading equivalence principle violations, cosmological, and other experimental constraints in scalar field theories with a strong coupling to matter

2007

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We show that, as a result of non-linear self-interactions, it is feasible, at least in light of the bounds coming from terrestrial tests of gravity, measurements of the Casimir force and those constraints imposed by the physics of compact objects, big-bang nucleosynthesis and measurements of the cosmic microwave background, for there to exist, in our Universe, one or more scalar fields that couple to matter much more strongly than gravity does. These scalar fields behave like chameleons: changing their properties to fit their surroundings. As a result these scalar fields can be not only very strongly coupled to matter, but also remain relatively light over solar system scales. These fields could also be detected by a number of future experiments provided they are properly designed to do so. These results open up an altogether new window, which might lead to a completely different view of the rôle played by light scalar fields in particle physics and cosmology.PACS numbers: 98.80.-k,98.80.Jk

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Laboratory Constraintsmentioning

confidence: 99%

Section: Combined Bounds On Chameleon Theoriesmentioning

confidence: 99%

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Evading equivalence principle violations, cosmological, and other experimental constraints in scalar field theories with a strong coupling to matter

2007

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“…As a comment, here we are trying to design a hollow cylinder which behaves gravitationally like a spherical shell in the inside region by eliminating its outer multipoles, Q LM . That can be compared with, for example, the test masses design strategy for the STEP (Satellite Test of the Equivalence Principle) mission [13]. The geometry of the STEP test masses is chosen to eliminate the inner multipoles, q lm , in order to construct monopole test masses.…”

Section: A Gravity Gradiometer For Self-gravity Diagnosticmentioning

confidence: 99%

Gravitational disturbances in drag-free spacecraft

Patón

Speake

Trenkel³

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. The performance of drag-free spacecraft will be ultimately limited by the uncompensated gravitational field and gravity field gradient of the spacecraft structure and payload. We identify sources of disturbance of gravitational origin and we explore a new concept for determining gravitational fields in the vicinity of the proof mass. The benefits of these diagnostic tools for future missions, like ASTROD, are discussed.

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“…The experiment will test the composition independence of gravitational acceleration for laboratory-sized bodies by searching for a violation of the EP with a fractional acceleration accuracy of ∆a/a ∼ 10 −18 [62,63]. STEP will be able to test very precisely for any nonmetric, long range interactions in physical law, however the results of this mission will say nothing about the metric component of gravity itself.…”

Section: Lator Vs Other Gravity Experimentsmentioning

confidence: 99%

The laser astrometric test of relativity mission

Turyshev¹,

Shao²,

Nordtvedt³

2004

Class. Quantum Grav.

100

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Abstract. This paper discusses the motivation and general design elements of a new fundamental physics experiment that will test relativistic gravity at the accuracy better than the effects of the second order in the gravitational field strength, ∝ G 2 . The Laser Astrometric Test Of Relativity (LATOR) mission uses laser interferometry between two micro-spacecraft whose lines of sight pass close by the Sun to accurately measure deflection of light in the solar gravity. The key element of the experimental design is a redundant geometry optical truss provided by a long-baseline (100 m) multi-channel stellar optical interferometer placed on the International Space Station (ISS). The spatial interferometer is used for measuring the angles between the two spacecraft and for orbit determination purposes. In Euclidean geometry, determination of a triangle's three sides determines any angle therein; with gravity changing the optical lengths of sides passing close by the Sun and deflecting the light, the Euclidean relationships are overthrown. The geometric redundancy enables LATOR to measure the departure from Euclidean geometry caused by the solar gravity field to a very high accuracy.LATOR will not only improve the value of the parameterized post-Newtonian (PPN) parameter γ to unprecedented levels of accuracy of 1 part in 10 8 , it will also reach ability to measure effects of the next post-Newtonian order (∝ G 2 ) of light deflection resulting from gravity's intrinsic non-linearity. The solar quadrupole moment parameter, J 2 , will be measured with high precision, as well as a variety of other relativistic effects including Lense-Thirring precession. LATOR will lead to very robust advances in the tests of Fundamental physics: this mission could discover a violation or extension of general relativity, or reveal the presence of an additional long range interaction in the physical law. There are no analogs to the LATOR experiment; it is unique and is a natural culmination of solar system gravity experiments. The LATOR mission 2

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The STEP mission: principles and baseline design

Cited by 79 publications

References 10 publications

Evading equivalence principle violations, cosmological, and other experimental constraints in scalar field theories with a strong coupling to matter

Evading equivalence principle violations, cosmological, and other experimental constraints in scalar field theories with a strong coupling to matter

Gravitational disturbances in drag-free spacecraft

The laser astrometric test of relativity mission

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