2024 Scalar field gravity

Scalar field gravity

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August undefined, 2024

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 …

Exact black hole solutions with a conformally coupled scalar field …

WebSep 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 this answer Follow answered Sep 29, 2014 at 4:18 user10851 Plus every such potential function is scalar regardless if this is for gravity or not – Nikos M. WebScalar fields are thought to pervade the Universe and to give the particles of the Standard Model their masses. The yet undiscovered Higgs par ticles are the quanta of these scalar … pearl diver nashville yelp

classical mechanics - Why is the gravitational field potential scalar …

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 … 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. WebApr 25, 2024 · The scalar field partakes the gravitational interactions with the graviton. The wave equation of the scalar field is found to be described by a new matter-wave equation proposed by Arbab [ 6, 7 ]. This is a quantum Telegraph equation whose classical analog governs the propagation of the electric signals in transmission lines. lightweight 44 watt de-icer

Physicists Discover that Gravity Can Create Light

Canonical scalar field inflation in $f(T)$ gravity with well-known ...

WebMar 2, 2024 · Similarly to how speed is the scalar quantity (or magnitude) of velocity, weight is the scalar quantity (or magnitude) of the gravitational force a celestial body exerts on mass. I'm still inclined to think of weight as a vector for convenience and to separate it from everyday language. WebApr 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 … lightweight 4 wheel walker with seatWebApr 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 … pearl diving in qatar history

"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 field gravity

Scalar field gravity

classical mechanics - Why is the gravitational field …

WebA reconstruction scheme for f (R) gravity is presented in Section 2 and Section 3, demonstrating the cosmology of the chameleon scalar field under reconstructed f (R) … WebFeb 28, 2024 · At the linear level, the additional field perturbations affect only the scalar equations, effectively sourcing the gravitational field. A clear effect of the K -dependent terms is on the propagation of gravitational waves, whose speed is now modified, since the parameter Γ is then given by Γ ≡ 1 + 2 α ( H 2 − K 2 / a 2 ).

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WebJan 1, 2014 · Gravity theories with non-minimally coupled scalar fields are used as characteristic examples in order to demonstrate the challenges, pitfalls and future … WebMay 18, 2024 · 5 Conclusion. In this paper, we have discussed one of the well-known feature of the early universe, named as inflation by using power law f (T) gravity under the realm of canonical scalar field. The Lagrangian density \mathcal {L} (X,\varphi ) for canonical scalar field is \mathcal {L} (X,\varphi )=X-V (\varphi ).

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 Web2 days ago · Download PDF Abstract: We propose a logarithmic parametrization form of energy density for the scalar field dark energy in the framework of the standard theory of gravity, which supports the necessary transition from the decelerated to the accelerated periods of the Universe. The analyzed model has a parameter space that is constrained by …

WebMar 19, 2024 · A scalar field is, to be frank, the most simple type of field you can have. What it says is, if you give the values that tell you “where” and “when” you are — where you are in … 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.

WebDec 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, …

pearl diving in the uae for kidsWebDec 1, 2024 · We consider cosmological scalar field evolving under exponential potential of the Non-minimal Derivative Coupling (NMDC) gravity model in Palatini formalism. Slow-roll regime is assumed. lightweight 458 bullets 200 grainWebMay 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. lightweight 458 silencercoWebApr 30, 2014 · the scalar aether is conserved. The matter flux-aether coupling generates an extra force acting on massive test particles and consequently the motion becomes non-geodesic. The Newtonian limit of the theory is investigated and the generalized Poisson equation for weak gravitational fields is obtained. The lightweight 4x12 sheetrock weightWebApr 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. pearl domestic agencyWebIn 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 … lightweight 4s buildWebMar 14, 2024 · Thus gravitational potential is a simple additive scalar field because the Principle of Superposition applies. The gravitational potential, between two points … lightweight 5.56 pistol upper