Energy and entropy in the Geometrical Trinity of gravity

Understand

All energy is gravitational energy.

• That is the consequence of the equivalence principle, according to which gravity is the universal interaction.
• The physical charges of this interaction have remained undisclosed, but the Adventof the Geometrical Trinity opened a new approach to this foundational problem.
• Here it is shown to provide a background-independent unification of the previous, non-covariant approaches of Bergmann-Thomson, Cooperstock, Einstein, von Freud, Landau-Lifshitz, Papapetrou and Weinberg.