Gravity is an attractive force that affects and is effected by all mass and - in general relativity - energy, pressure and stress. Prefer newtonian-gravity or general-relativity if sensible.

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Deriving the Fierz-Pauli propagator

Fierz-Pauli action can be written as $$ S = \int d^Dx \; \frac{1}{2} h_{\mu \nu} \mathcal{O}^{\mu \nu, \alpha \beta}h_{\alpha \beta} $$ where the operator $$ \mathcal{O}^{\mu \nu} {}_{\alpha ...