Pulsar Timing — Strong Gravity Clock Experiments

Wex, Norbert

doi:10.1007/3-540-40988-2_20

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…Another question is whether this time drift is also consistent with the observations of pulsars and binary systems which also define clocks. Pulsars are very stable clocks [27]. Owing to the radiation of gravitational waves the revolution time of binary systems goes down.…”

Section: Discussion Of Some Conventional Effectsmentioning

confidence: 99%

Is the Physics Within the Solar System Really Understood?

Lämmerzahl

Preuss

Dittus

2008

Astrophysics and Space Science Library

111

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A collection is made of presently unexplained phenomena within our Solar system and in the universe. These phenomena are (i) the Pioneer anomaly, (ii) the flyby anomaly, (iii) the increase of the Astronomical Unit, (iv) the quadrupole and octupole anomaly, and (v) Dark Energy and (vi) Dark Matter. A new data analysis of the complete set of Pioneer data is announced in order to search for systematic effects or to confirm the unexplained acceleration. We also review the mysterious flyby anomaly where the velocities of spacecraft after Earth swing-bys are larger than expected. We emphasize the scientific aspects of this anomaly and propose systematic and continuous observations and studies at the occasion of future flybys. Further anomalies within the Solar system are the increase of the Astronomical Unit and the quadrupole and octupole anomaly. We briefly mention Dark Matter and Dark Energy since in some cases a relation between them and the Solar system anomalies have been speculated.

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Section: Discussion Of Some Conventional Effectsmentioning

confidence: 99%

Is the Physics Within the Solar System Really Understood?

Lämmerzahl

Preuss

Dittus

2008

Astrophysics and Space Science Library

111

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“…Rañada [302] investigated the effect of a background gravitational potential that pervades the universe and is increasing because of the expansion, provoking a drift of clocks [27]; however, such an effect should also be observed in the radio signals from pulsars [198, 410], which is not the case. Further refining their argument, Rañada and and Tiemblo [303] investigated the nonequivalence of atomic and astronomical times and concluded that these times could be accelerating adiabatically with respect to one another.…”

Section: Efforts To Explain and Study The Anomalymentioning

confidence: 99%

The Pioneer Anomaly

Turyshev

Toth²

2010

Living Rev. Relativ.

137

148

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Radio-metric Doppler tracking data received from the Pioneer 10 and 11 spacecraft from heliocentric distances of 20–70 AU has consistently indicated the presence of a small, anomalous, blue-shifted frequency drift uniformly changing with a rate of ∼ 6 × 10−9 Hz/s. Ultimately, the drift was interpreted as a constant sunward deceleration of each particular spacecraft at the level of aP = (8.74 ± 1.33) × 10−10 m/s2. This apparent violation of the Newton’s gravitational inverse-square law has become known as the Pioneer anomaly; the nature of this anomaly remains unexplained. In this review, we summarize the current knowledge of the physical properties of the anomaly and the conditions that led to its detection and characterization. We review various mechanisms proposed to explain the anomaly and discuss the current state of efforts to determine its nature. A comprehensive new investigation of the anomalous behavior of the two Pioneers has begun recently. The new efforts rely on the much-extended set of radio-metric Doppler data for both spacecraft in conjunction with the newly available complete record of their telemetry files and a large archive of original project documentation. As the new study is yet to report its findings, this review provides the necessary background for the new results to appear in the near future. In particular, we provide a significant amount of information on the design, operations and behavior of the two Pioneers during their entire missions, including descriptions of various data formats and techniques used for their navigation and radio-science data analysis. As most of this information was recovered relatively recently, it was not used in the previous studies of the Pioneer anomaly, but it is critical for the new investigation.

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“…Rañada [304] investigated the effect of a background gravitational potential that pervades the universe and is increasing because of the expansion, provoking a drift of clocks [18]; however, such an effect should also be observed in the radio signals from pulsars [189,411], which is not the case. Further refining their argument, Rañada and and Tiemblo [305] investigated the nonequivalence of atomic and astronomical times and concluded that these times could be accelerating adiabatically with respect to one another.…”

Section: Clock Accelerationmentioning

confidence: 99%

The Pioneer Anomaly

Turyshev,

Toth

2010

Preprint

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Radio-metric Doppler tracking data received from the Pioneer 10 and 11 spacecraft from heliocentric distances of 20 -70 AU has consistently indicated the presence of a small, anomalous, blue-shifted frequency drift uniformly changing with a rate of ∼ 6 × 10 −9 Hz/s. Ultimately, the drift was interpreted as a constant sunward deceleration of each particular spacecraft at the level of aP = (8.74 ± 1.33) × 10 −10 m/s 2 . This apparent violation of the Newton's gravitational inverse-square law has become known as the Pioneer anomaly; the nature of this anomaly remains unexplained. In this review, we summarize the current knowledge of the physical properties of the anomaly and the conditions that led to its detection and characterization. We review various mechanisms proposed to explain the anomaly and discuss the current state of efforts to determine its nature. A comprehensive new investigation of the anomalous behavior of the two Pioneers has begun recently. The new efforts rely on the much-extended set of radio-metric Doppler data for both spacecraft in conjunction with the newly available complete record of their telemetry files and a large archive of original project documentation. As the new study is yet to report its findings, this review provides the necessary background for the new results to appear in the near future. In particular, we provide a significant amount of information on the design, operations and behavior of the two Pioneers during their entire missions, including descriptions of various data formats and techniques used for their navigation and radio-science data analysis. As most of this information was recovered relatively recently, it was not used in the previous studies of the Pioneer anomaly, but it is critical for the new investigation.

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Pulsar Timing — Strong Gravity Clock Experiments

Cited by 8 publications

References 39 publications

Is the Physics Within the Solar System Really Understood?

Is the Physics Within the Solar System Really Understood?

The Pioneer Anomaly

The Pioneer Anomaly

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