2024 Bimetric gravity

Bimetric gravity

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August undefined, 2024

WebMay 17, 2013 · We consider the issues that arise out of interpreting the ghost-free bimetric theory as a theory of a spin-2 field coupled to gravity. This requires identifying a gravitational metric and parameterizing deviations of … Bimetric gravity or bigravity refers to two different classes of theories. The first class of theories relies on modified mathematical theories of gravity (or gravitation) in which two metric tensors are used instead of one. The second metric may be introduced at high energies, with the implication that the speed … See more In general relativity (GR), it is assumed that the distance between two points in spacetime is given by the metric tensor. Einstein's field equation is then used to calculate the form of the metric based on the distribution of … See more • Alternatives to general relativity • DGP model • Scalar–tensor theory See more Since 2010 there has been renewed interest in bigravity after the development by Claudia de Rham, Gregory Gabadadze, and Andrew Tolley (dRGT) of a healthy theory of massive gravity. Massive gravity is a bimetric theory in the sense that nontrivial … See more

(PDF) The bimetric theory of quantized fields - ResearchGate

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? WebMar 20, 2024 · Bimetric gravity, is a theory of gravity that posits the existence of two interacting and dynamical metric tensors. The spectrum of bimetric gravity consists of … facebook business account hacked

Bimetric gravity - Nanowerk

WebJan 4, 2024 · 14, 15] through his construction of a bimetric theory of gravity. In [16] a bimetric. gravity w as obtained from ghost-free massive gravit y. Our theory developed here. 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 … WebBimetric definition: (mathematics, physics) Describing any system that may be described using two metrics. . facebook business account costs

[2303.11353] Bimetric-Affine Quadratic Gravity

[1109.3515] Bimetric Gravity from Ghost-free Massive …

WebSep 16, 2011 · Bimetric Gravity from Ghost-free Massive Gravity S. F. Hassan, Rachel A. Rosen Generically, non-linear bimetric theories of gravity suffer from the same … WebFeb 24, 2012 · 581 Citations 16 Altmetric Metrics bstract Generically, non-linear bimetric theories of gravity suffer from the same Boulware-Deser ghost instability as non-linear theories of massive gravity. However, recently proposed theories of massive gravity have been shown to be ghost-free. facebook burdekin community churchhttp://export.arxiv.org/abs/1109.3515 facebook business account customer service

"WebSep 16, 2011 · Generically, non-linear bimetric theories of gravity suffer from the same Boulware-Deser ghost instability as non-linear theories of massive gravity. However, … " - Bimetric gravity

Bimetric gravity

WebFeb 24, 2012 · bstract Generically, non-linear bimetric theories of gravity suffer from the same Boulware-Deser ghost instability as non-linear theories of massive gravity. … WebOct 4, 2013 · We derive dynamical and gravitational lensing properties of local sources in the Hassan-Rosen bimetric gravity theory. Observations of elliptical galaxies rule out …

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WebA key feature of the new theory, named bimetric gravity (or bigravity), is that both metrics are dynamical contrary to the massive gravity theories so far. For reviews on the subject of massive gravity and bimetric gravity see e.g. [14–16]. Bimetric gravity has been studied extensively in recent years with still continuing activity [17–21]. WebJan 26, 2024 · Bimetric gravity is an interesting alternative to standard GR given its potential to provide a concrete theoretical framework for a ghost-free massive gravity …

WebJul 29, 2010 · Gravimetric definition, of or relating to measurement by weight. See more. WebJan 15, 2013 · In massive gravity and in bimetric theories of gravity, two constraints are needed to eliminate the two phase-space degrees of freedom of the Boulware-Deser ghost.

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. WebThe work is carried through in metric gravity for the class of Christoudoulou-Klainermann space-times, in which the temporal evolution is ruled by the {\it weak} ADM energy. The main results of the investigation are the following: 1) A re-interpretation of {\it active} diffeomorphisms as {\it passive and metric-dependent} dynamical symmetries ...

WebOct 4, 2013 · In order to have background solutions resembling the concordance cosmological model, without fine-tuning of the parameters of the model, we are restricted to the upper interval, or λ g / r H ~ 1, for which the Vainshtein mechanism is expected to restore general relativity for local sources.

WebBimetric gravity or bigravity refers to two different class of theories. The first class of theories rely on modified mathematical theories of gravity (or gravitation) in which two … facebook business account helpWebIn 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 … facebook business account setup cost does medicare cover home inr testing metersWebJun 20, 2012 · holes (not bimetric gravity blac k holes) have been studied in the literature only by assuming ﬂat backgrounds [ 22 – 25 ]. In massive gravit y with a conformally ﬂat background metric, our ... does medicare cover home sleep studyWebJan 26, 2024 · Bimetric gravity is an interesting alternative to standard GR given its potential to provide a concrete theoretical framework for a ghost-free massive gravity theory. Here we investigate a class of Bimetric gravity models for their cosmological implications. We study the background expansion as well as the growth of matter … facebook business account setup loginWeb* 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 … does medicare cover home testing kitsWebJun 16, 2024 · Bimetric gravity is a ghost-free and observationally viable extension of general relativity, exhibiting both a massless and a massive graviton. The observed … does medicare cover hospice rooms