The Equivalence Principle is a key element in the development of General Relativity. In one its formulations, states that reference frame at rest uniform gravitational field equivalent to uniformly accelerated motion absence any gravitation field. We analyze spacetime surrounding non-rotating spherically symmetric charged body, known as Reissner–Nordström geometry, and exhibit coordinate transf...

Owing to the development of String Theory and Quantum Gravity, studies quantized spaces described by deformed commutation relations for operators coordinates momenta have received much attention. In this paper, implementation weak equivalence principle is examined in different types algebras, among them noncommutative algebra canonical type, Lie nonlinear with an arbitrary function deformation ...

The THǫμ formalism was developed to study nonmetric theories of gravitation. In this letter we show that theories that violate Local Lorentz Invariance (LLI) or Local Position Invariance (LPI) also violate charge conservation. Using upper bounds on this violation we can put very stringent limits to violations of Einstein Equivalence Principle (EEP). These limits, in turn, severely restrict stri...