Scalar field gravity
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. WebApr 7, 2024 · "Note that the inverse process, namely the production of gravitational waves via parametric resonance from an oscillating scalar field, does not occur in a Minkowski background in a vacuum since ...
Scalar field gravity
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WebDec 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. 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.
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 … 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
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 ). 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 …
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 … swimming lesson risk assessmentWebApr 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 … bra studio bgWebApr 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. brast supWebMar 14, 2024 · Thus gravitational potential is a simple additive scalar field because the Principle of Superposition applies. The gravitational potential, between two points … swimming lees summitWebA scalar is an entity which only has a magnitude – no direction. Examples of scalar quantities include mass, electric charge, temperature, distance, etc. A vector, on the other hand, is an entity that is characterized by a magnitude and a direction. Examples of vector quantities are displacement, velocity, magnetic field, etc. brastvWebApr 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 … swimming lessons annapolis valleyWebSep 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. swimming lessons adults amsterdam