On a recently proposed scalar-tensor-vector metric extension of general relativity to explain the Pioneer anomaly

TL;DR

This paper evaluates a scalar-tensor-vector gravity model proposed to explain the Pioneer anomaly, finding it inconsistent with planetary perihelion data, thus challenging its viability as a comprehensive explanation.

Contribution

The paper critically assesses the STVG model's compatibility with planetary orbital data, highlighting limitations in its ability to explain the Pioneer anomaly.

Findings

STVG model fitted to Pioneer data conflicts with planetary perihelion measurements.

The model's predictions are inconsistent with observed orbital extra-rates.

The results question the model's validity as a universal explanation for the anomaly.

Abstract

Recently, Brownstein and Moffat proposed a gravitational mechanism to explain the Pioneer anomaly based on their scalar-tensor-vector (STVG) metric theory of gravity. In this paper we show that their model, fitted to the presently available data for the anomalous Pioneer 10/11 acceleration, is in contrast with the latest determinations of the perihelion extra-rates of Jupiter, Saturn and Uranus.