Constraining an Expanding Locally Anisotropic metric from the Pioneer anomaly
arXiv:1202.6189 · doi:10.1016/j.asr.2012.11.004
Abstract
It is discussed the possibility of a fine-tuneable contribution to the two way Doppler acceleration either towards, either outwards the Sun for heliocentric distances above 20 AU by considering a background described by an Expanding Locally Anisotropic (ELA) metric. This metric encodes both the standard local Schwarzschild gravitational effects and the cosmological Universe expansion effects allowing simultaneously to fine-tune other gravitational effects at intermediate scales, which may be tentatively interpreted as a covariant parameterization of either cold dark matter either gravitational interaction corrections. Are derived bounds for the ELA metric functional parameter by considering the bounds on the deviation from standard General Relativity imposed by the current updated limits for the Pioneer anomaly, taking in consideration both the natural outgassing and on-board radiation pressure, resulting in an average Doppler acceleration outwards the Sun of a_p = +0.4^{+2.1}_{-2.0} x 10^{-10} (m/s^2). It is also computed the mass-energy density for the ELA metric within the bounds obtained and are discussed the respective contributions to the cosmological mass-energy density which, for compatibility with the Lambda-CDM model, are included in Omega_{CDM}.
22 pages; 6 figures; based on arXiv:1102.2061 with updated estimative for Pioneer anomaly
References in corpus (11)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
- Support for the thermal origin of the Pioneer anomaly
- f(R) Gravity: From the Pioneer Anomaly to the Cosmic Acceleration
- Thermal Analysis of the Pioneer Anomaly: A method to estimate radiative momentum transfer
- Cosmological perturbations on local systems
- Could the Pioneer anomaly have a gravitational origin?
- Independent analysis of the orbits of Pioneer 10 and 11
- Can the Pioneer anomaly be induced by velocity-dependent forces? Tests in the outer regions of solar system with planetary dynamics
- On Doppler tracking in cosmological spacetimes
- A Locally Anisotropic Metric for Matter in an Expanding Universe: I. The Ansatz and the Modified Newton Law
- Five-dimensional Gravity and the Pioneer Effect