Equivalence principle in chameleon models

Equivalence Principle Implications of Modified Gravity Models

The Digital Chameleon Principle : Computing Invisibility

H ow many of us have had a dream of being invisible? But is that really that far-fetched, impossible, or improbable? As a child I used to daydream of magical powers that let me pursue exciting adventures in magical wonderlands. These great magical powers exhibited technology far beyond the current state of the art. I still clearly remember today those fantastic dreams. Indeed, dreaming that kin...

The Equivalence Principle

Questioning the Equivalence Principle

The Equivalence Principle (EP) is not one of the “universal” principles of physics (like the Action Principle). It is a heuristic hypothesis which was introduced by Einstein in 1907, and used by him to construct his theory of General Relativity. In modern language, the (Einsteinian) EP consists in assuming that the only long-range field with gravitational-strength couplings to matter is a massl...

Is the Principle of Equivalence a Principle?

The work argues the principle of equivalence to be a theorem and not a principle (in a sense of an axiom). It contains a detailed analysis of the concepts of normal and inertial frame of reference. The equivalence principle is proved to be valid (at every point and along every path) in any gravitational theory based on linear connections. Possible generalizations of the equivalence principle ar...