Energy conditions in f q gravity

Author: yihk

August undefined, 2024

WebDec 9, 2024 · The f(Q) gravity (where Q is the non-metricity scalar) is a recently proposed non-metricity-based modified gravity proposed by Jimenez et al. . Although, it is recently proposed gravity, many interesting works have already been done, such as, cosmography [ 47 ], energy conditions [ 48 ], covariant formulation [ 49 ], signature of f ( Q ... Web8. Gravitation is something that gives rise to a force. Like most forces, it can be put to work, just like in dams. But gravitation is not energy: it's an interaction between physical …

Energy conditions in f(Q, T) gravity - IOPscience

WebJun 21, 2024 · Energy Vault. When renewable energy solutions wane from a lack of wind, tide, or sun, old-fashioned gravity can fill the gap to create energy. Using suspended … WebAbstract In this paper, we considered the study of Friedmann–Robertson–Walker (FRW) model in the framework of f ( Q, T) gravity, an extension of symmetric teleparallel gravity, recently defined by Xu et al. [ f ( Q, T) gravity, Eur. Phys. J. C 79 (2024) 708]. scaffolding pole for sale near me

How different connections in flat FLRW geometry impact energy ...

Webwhere rf and pf are respectively the energy density and pressure of the scalar ﬁeld, given by [42,43] rf = 1 2. f 2 +V f, (14) and pf = 1 2. f 2 V f. (15) Here, the potential energy V f and kinetic energy. f 2 2 are scalar ﬁeld functions that correspond to each pair of (t, x) in space-time. In addition, the scalar curvature coupling, which cou- WebJul 6, 2024 · Download a PDF of the paper titled Cosmology in $f(Q)$ gravity: A unified dynamical system analysis at background and perturbation levels, by Wompherdeiki Khyllep and ... WebJul 20, 2024 · In this work, we present a complete test of energy conditions for f(Q) gravity models. The energy conditions allowed us to fix our free parameters, restricting the … scaffolding pole sizes

From gigawatt to multi-gigawatt wind farms: wake effects, energy ...

Matter bounce scenario and the dynamical aspects in f(Q,T) gravity ...

WebOct 10, 2012 · The fundamental elements of f ( R, Lm) gravity are given in section 2. In section 3, the well-known energy conditions, namely the strong energy condition (SEC), the null energy condition (NEC), the weak energy condition (WEC) and the dominant energy condition (DEC) are derived in f ( R, Lm) gravity. WebIn this paper, we studied the strong, the weak, the null, and the dominant energy conditions for f (Q) gravity, working with a perfect fluid matter distribution. The actual … scaffolding poem question and answerWebSep 1, 2024 · Varying the gravitational action (1), the field equation of f ( Q, T) gravity can be obtained as, − 2 − g k ( f Q − g P μ ν k) − 1 2 f g μ ν + f T ( T μ ν + Θ μ ν) − f Q ( P μ k l Q ν k l − 2 Q μ k l P k l ν) = 8 π T μ ν, where f Q = ∂ f ( Q, T) ∂ Q, the energy momentum tensor, T μ ν ≡ − 2 − g δ ( − g L m) δ g μ ν, Θ μ ν ≡ g α β δ T α β δ g μ ν. scaffolding poles and brackets

"WebNov 25, 2024 · Our survey indicates that wormhole solutions could not exist for specific form function f (Q)= Q+ \alpha Q^2. To summarize, exact wormhole models can be … " - Energy conditions in f q gravity

Energy conditions in f q gravity

Cosmic acceleration and energy conditions in symmetric …

WebAug 1, 2024 · In f (Q) gravity, the action is given by Mandal et al. (2024); De et al. (2024); Shekh (2024b) (1) S = ∫ [− 1 2 f (Q) + L m] d 4 x − g, where f (Q) is an arbitrary function … WebThe energy conditions and the Dolgov-Kawasaki criterion in generalized gravity with arbitrary coupling between matter and geometry are derived in this paper, which are …

Did you know?

WebJun 1, 2024 · In this manuscript, we assume a f ( Q) model that contains a linear and a non-linear form of non-metricity scalar, particularly f ( Q) = α Q + β Q n, where α, β, and n are free model parameters. Then we find the values of our model parameters that would be in agreement with the observed value of cosmographic parameters. WebApr 11, 2024 · (2024), the authors studied energy conditions in f ( Q ) theory following the same path as researchers handled the energy conditions in the curvature-based modiﬁed gravity theories, like f ( R ) or f …

WebApr 4, 2024 · In the current study, we investigate the possible existence of new wormhole solutions within f(Q) gravity by using the conformal symmetry, where Q is a non-metricity scalar. Modified versions of field equations within the scope of conformal symmetry with an anisotropic source of matter are calculated using the variational approach. We consider … WebIn this paper, we studied the strong, the weak, the null, and the dominant energy conditions for f (Q) gravity, working with a perfect fluid matter distribution. The actual accelerating phase our Universe passes through, constraints that the strong energy condition should be violated.

WebFeb 11, 2024 · We investigate the impact on cosmological observables of f(Q) -gravity, a specific class of modified gravity models in which gravity is described by the nonmetricity scalar, Q. WebSep 1, 2024 · In this paper, we have examined the recently proposed modified symmetric teleparallel gravity, in which gravitational Lagrangian is given by an arbitrary function of non-metricity scalar Q. We have… PDF Coupling between DBI dark energy model and f (Q) gravity and its effect on condensed body mass accretion

WebThe energy conditions and the Dolgov-Kawasaki criterion in generalized gravity with arbitrary coupling between matter and geometry are derived in this paper, which are quite general and can degenerate to the well-know…

WebAssuming ordinary barotropic fluid as the matter source, we first derive the Friedmann-like pressure and energy equations. Next we impose constraints on the parameters of… Expand scaffolding poles and fittings for saleWebSep 1, 2024 · We study the cosmological inflation within the context of f (Q, T) gravity, wherein Q is the nonmetricity scalar and T is the trace of the matter energy–momentum tensor. By choosing a linear combination of Q and T, we first analyze the realization of an inflationary scenario driven via the geometrical effects of the linear f (Q, T) gravity and … scaffolding poles ebayWebAug 12, 2024 · In Phys. Rev. D 102, 024057 (2024), the authors studied energy conditions in f (Q) theory following the same path as researchers handled the energy conditions in the curvature-based... scaffolding pole lengthsWebIn relativistic classical field theories of gravitation, particularly general relativity, an energy condition is a generalization of the statement "the energy density of a region of space … scaffolding poles wickesWebMar 30, 2024 · The article presented a thorough investigation of gravitational baryogenesis interactions in the framework of $f(Q,{\mathcal { T}})$ gravity where Q denote the nonmetricity and ${\mathcal { T}}$ the trace of the energy momentum tensor. For this type of modified gravity we find the baryon-to-entropy ratio to be proportional to $\dot{Q}$, … scaffolding poles shropshireWebJun 28, 2024 · New high-precision observations are now possible to constrain different gravity theories. To examine the accelerated expansion of the Universe, we used the newly proposed f(Q, T) gravity, where Q is the non-metricity, and T is the trace of the energy–momentum tensor. The investigation is carried out using a parameterized … scaffolding poles scaffolding \u0026 laddersWebJul 20, 2024 · In this work, we are aiming to explore the cosmological bouncing scenarios in symmetric teleparallel gravity (i.e., f ( Q) gravity). This manuscript is organized as follows: in Sect. 2, we briefly discuss the gravitational formalism for f ( Q) gravity. In Sect. 3, we present the energy conditions. Then, we discuss different types of bouncing ... scaffolding poles and fittings