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Scalar field gravity

WebIn general relativity, a scalar field solution is an exact solution of the Einstein field equation in which the gravitational field is due entirely to the field energy and momentum of a … WebApr 4, 2024 · In violation of the generalized Lichnerowicz theorem advocated in , quadratic gravity admits vacua with scalar curvature. In a recent publication , we revitalized a program – that Buchdahl originated but prematurely abandoned circa 1962 – and uncovered a novel exhaustive class of static spherically symmetric vacua for pure ℛ 2 gravity. The Buchdahl …

Scalar field solution - Wikipedia

WebIn scalar-tensor theories, then, where this coefficient is replaced by some function of a field which can vary throughout spacetime, the "strength" of gravity (as measured by the local value of Newton's constant) will be different from place to place and time to time. WebED have been used to derive or reconstruct both non-relativistic quantum mechanics and quantum field theory in curved space-time. Here we propose a model for a quantum … express coupons for november https://goboatr.com

Scalar field - Wikipedia

WebApr 7, 2024 · Karim Noui, Hugo Roussille, David Langlois. We consider axial (or odd-parity) perturbations of non-spinning hairy black holes (BH) in shift-symmetric DHOST (Degenerate Higher-Order Scalar-Tensor) theories, including terms quartic and cubic in second derivatives of the scalar field. We give a new formulation of the effective metric in which ... Scalar theories of gravitation are field theories of gravitation in which the gravitational field is described using a scalar field, which is required to satisfy some field equation. Note: This article focuses on relativistic classical field theories of gravitation. The best known relativistic classical field theory of … See more The prototypical scalar theory of gravitation is Newtonian gravitation. In this theory, the gravitational interaction is completely described by the potential $${\displaystyle \Phi }$$, which is required to satisfy the See more • Kaluza–Klein theory involves the use of a scalar gravitational field in addition to the electromagnetic field potential $${\displaystyle A^{\mu }}$$ in an attempt to create a five … See more • Nordström's theory of gravitation See more The first attempts to present a relativistic (classical) field theory of gravitation were also scalar theories. Gunnar Nordström created two such theories. Nordström's first … See more In 1913, Einstein (erroneously) concluded from his hole argument that general covariance was not viable. Inspired by Nordström's work, he proposed his own scalar theory. This theory employs a massless scalar field coupled to the stress–energy … See more • Goenner, Hubert F. M., "On the History of Unified Field Theories"; Living Rev. Relativ. 7(2), 2004, lrr-2004-2. Retrieved August 10, 2005. See more WebWe often write the symbol that represents a scalar field as V ( r →) where the position vector ( r →) not only reminds us that the scalar field may vary from point to point in space, but … bubbly can size

Chameleon scalar fields in relativistic gravitational backgrounds ...

Category:Tensor-scalar gravity and binary-pulsar experiments. - Semantic …

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Scalar field gravity

[2304.04802] Kasner-like description of spacelike singularities in ...

WebApr 11, 2024 · The evolution of a GW is described by a sum of the independent evolution of the two (+ and ×) modes. The situation differs in alternative theories of gravity with extra degrees of freedom (such as an additional scalar) which allow additional GW polarizations. The extra modes can appear and mix as the GWs propagate. In physics, scalar fields often describe the potential energy associated with a particular force. The force is a vector field, which can be obtained as a factor of the gradient of the potential energy scalar field. Examples include: • Potential fields, such as the Newtonian gravitational potential, or the electric potential in electrostatics, are scalar fields which describe the more familiar forces.

Scalar field gravity

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WebFeb 27, 1996 · Tensor-scalar gravity and binary-pulsar experiments. Damour, Esposito-Farèse. Published 27 February 1996. Physics. Physical review. D, Particles and fields. Some recently discovered nonperturbative strong-field effects in tensor-scalar theories of gravitation are interpreted as a scalar analogue of ferromagnetism: "spontaneous … WebMay 18, 2024 · It take the position in space (x,y,z) and returns a number (a scalar) 3xyz. A vector field takes a position in space in returns a vector, which should be thought of as pointing from that position. The gravitational force created by a body is a vector field, while the potential is a scalar field.

WebApr 10, 2024 · We study the properties of spacelike singularities in spherically symmetric spacetimes obeying the Einstein equations, in the presence of matter. We consider in particular matter described by a scalar field, both in the presence of an electromagnetic field and without. We prove that if a spacelike singularity obeying several reasonable … WebMay 25, 2024 · The propagators so obtained are used to compute one loop divergences in Vilkovisky-Dewitt's effective action for a scalar field minimally coupled with gravity for arbitrary space-time background.

WebIn the point-splitting prescription for renormalizing the stress-energy tensor of a scalar field in curved spacetime, it is assumed that the anticommutator expectation valueG(x, x′)= … WebOct 8, 2024 · Time invariant solutions of scalar field equations with zero mass vary like 1 / r, with r the distance from the "center" of the field. With a massive field, we get a variation of the form exp ( − m c ℏ r) / r, which reverts to the 1 / r variation as m → 0.

WebJun 3, 2005 · Abstract:A covariant scalar-tensor-vector gravity theory is developed which allows the gravitational constant $G$, a vector field coupling $\omega$ and the vector field mass $\mu$ to vary with space and time. The equations of motion for a test particle lead to a modified gravitational acceleration law that can fit

WebApr 4, 2024 · We build a self-consistent relativistic scalar theory of gravitation on a flat Minkowski spacetime from a general field Lagrangian. It is shown that, for parameters … express courier international nashvilleWebApr 10, 2014 · Gravity and Scalar Fields Thomas P. Sotiriou Gravity theories with non-minimally coupled scalar fields are used as characteristic examples in order to … express courier interstateWebSep 29, 2014 · The exterior derivative of a scalar is essentially its gradient. That is, d f = 0 f = d ϕ (Poincare lemma) ∇ × F = 0 F = ∇ Φ (gradient theorem converse). Share Cite Improve … bubbly cansWebJun 10, 2015 · Theory of gravity with a quadratic contribution of scalar curvature is investigated in terms of dynamical system approach. The simplest Friedmann-Robertson-Walker metric is used to formulate dynamics… Expand PDF The Cosmological Constant and a Scalar Field Coupled non Minimally to Gravity M. Novello, A. E. S. Hartmann Physics bubbly cauldronWebfield, in physics, a region in which each point has a physical quantity associated with it. The quantity could be a number, as in the case of a scalar field such as the Higgs field, or it could be a vector, as in the case of fields such as the gravitational field, which are associated with a force. Objects fall to the ground because they are affected by the force … express courier international in madisonWebTypes of Scalar Fields > s.a. parametrized theories. * Massless: In quantum gravity they cannot exist as elementary particles, because they would acquire a mass from interactions with topological fluctuations. * 1+1 dimensions: There can be no massless scalar particle even without quantum gravity, because there could be arbitrarily long ... bubbly celebrationWebDec 15, 2024 · Direct limits for scalar field dark matter from a gravitational-wave detector Sander M. Vermeulen, Philip Relton, Hartmut Grote, Vivien Raymond, Christoph Affeldt, … express courier international waco tx