2024 Bimetric gravity

Bimetric gravity

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August undefined, 2024

http://export.arxiv.org/abs/1109.3515 WebMay 1, 2015 · Bimetric variational formalism was recently employed to construct novel bimetric gravity models. In these models an affine connection is generated by an additional tensor field which is independent of the physical metric.

Bimetric Definition & Meaning YourDictionary

WebThe Hasan-Rosen formulation of bimetric gravity can schematically be written as [1]: L b i = L g + L f + L i n t. where L g is the Einstein-Hilbert action for metric g μ ν and similarly for metric f μ ν. The interesting part really lies in the interaction term. This interaction term can schematically be written as: 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. effacement of oropharynx

Bimetric gravity - Wikipedia

WebAug 1, 2014 · bimetric gravity formulated in the vierbein formalism where. the spin connection is treated as an independent ﬁeld was. performed with elegant formulations of the secondary con- WebSep 16, 2011 · Bimetric Gravity from Ghost-free Massive Gravity S. F. Hassan, Rachel A. Rosen (Submitted on 16 Sep 2011 ( v1 ), last revised 3 Apr 2012 (this version, v2)) Generically, non-linear bimetric theories of gravity suffer from the same Boulware-Deser ghost instability as non-linear theories of massive gravity. WebJul 8, 2013 · Abstract. This paper is devoted to the Hamiltonian analysis of bimetric gravity in vierbein formulation. We identify all constraints and determine their nature. We show that there are no ... contagious after cold

[1109.3515] Bimetric Gravity from Ghost-free Massive …

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 … 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 effacement and stationWebTitle: Bimetric-Affine Quadratic Gravity Authors: Ioannis D. Gialamas, Kyriakos Tamvakis. Comments: 11 pages, 2 figures Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th) effaced pregnancy does mean

"WebNov 29, 2014 · General Relativity and Gravitation - The possibility of matter coupling to two metrics at once is considered. This appears natural in the most general ghost-free, bimetric theory of gravity, where... The possibility of matter coupling to … " - Bimetric gravity

Bimetric gravity

general relativity - Gravity with more than one metric tensor

Theories of gravity can be classified, loosely, into several categories. Most of the theories described here have: • an 'action' (see the principle of least action, a variational principle based on the concept of action) • a Lagrangian density 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 ...

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WebOne is Bimetric Gravity, a modification of GR which breaks the assumption that one single, massless spin-2 object acts as its force carrier. Original results are presented on the phenomenology of the massive graviton, where we analyse the modified propagation of gravitational waves and set competitive bounds on the graviton mass. Furthermore ... 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.

WebThe presence of Nambu–Goldstone bosons introduce a natural degeneracy inside the vacuum solutions of the nonlinear formulations of massive gravity in the same spirit of the [Formula: see text]-models. When the gravitational effects are taken into 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.

WebJun 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 ... 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.

WebFeb 18, 2016 · Bi-gravity can get very complicated but many of the complications about what the degrees of freedom mean also appear in the standard model, at least in spirit. …

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 … contagious agalactia sheepWebMay 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. contagious after feverWebNov 1, 2024 · Bimetric gravity is a ghost-free and observationally viable extension of general relativity, exhibiting both a massless and a massive graviton. The observed … effaced in childbirthWebIn 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 … effacement of sinotubular ridgeWebOct 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 … contagious after tamifluWebBimetric definition: (mathematics, physics) Describing any system that may be described using two metrics. . effacement of the fatty hilumWebDec 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? contagious agency scotland