Gravitation in the solar system and metric extensions of general relativity

TL;DR

This paper explores extensions of general relativity that maintain its geometric foundation and aim to reconcile observed anomalies like Pioneer with existing solar system tests, proposing new testable predictions.

Contribution

It introduces metric extensions of general relativity that can explain Pioneer anomalies while remaining consistent with other solar system gravity tests.

Findings

Proposed extensions preserve geometric nature of gravity.

Extensions can reconcile Pioneer anomalies with existing tests.

Discussed potential phenomenological consequences.

Abstract

Despite its remarkable agreement with gravity tests in the solar system, general relativity is challenged at larger scales. Large scale tests performed in the solar system by the Pioneer 10/11 probes have failed to confirm the expected gravity laws. We discuss here extensions of general relativity which preserve its geometrical nature while showing an ability to conciliate the Pioneer anomalies with other gravity tests. Further testable phenomenological consequences are also briefly discussed.