WebDec 11, 2024 · 1 Massive and Bimetric Gravity Considering gravity in the field-theoretical framework, a natural theoretical question arises to whether the graviton particle itself could be a massive particle. In the same way as the particles in the standard model acquire a mass, could the spin-2 particle be endowed with a mass term? Web* Idea: A theory of gravity with two distinct metrics, a gravitational gab which describes the geometry of spacetime and controls the speed of gravity, and a matter metric γab which …
[1109.3515] Bimetric Gravity from Ghost-free Massive Gravity
http://export.arxiv.org/abs/1109.3515 WebIn the mathematical field of differential geometry, the Riemann curvature tensor or Riemann–Christoffel tensor (after Bernhard Riemann and Elwin Bruno Christoffel) is the most common way used to express the curvature of Riemannian manifolds.It assigns a tensor to each point of a Riemannian manifold (i.e., it is a tensor field).It is a local … intertec group qatar
Protophysics and the Meaning of Space-time Geometry
WebMay 26, 2024 · Bimetric gravity theories describes gravitational interactions in the presence of an extra spin-2 field. The Hassan–Rosen (HR) nonlinear massive minimal bigravity theory is a ghost-free bimetric theory formulated with respect a flat, dynamical reference metric. WebIn the bimetric scalar–tensor gravitational theory there are two frames associated with the two metrics ĝ μν and g μν, which are linked by the gradients of a scalar field ϕ.The choice of a comoving frame for the metric ĝ μν or g μν has fundamental physical consequences for local observers in either metric spacetimes, while maintaining diffeomorphism invariance. WebMay 3, 2024 · Ghost-free bimetric gravity is an extension of general relativity, featuring a massive spin-2 field coupled to gravity. We parameterize the theory with a set of observables having specific physical interpretations. new garden cafe