Stability of cosmic structures in scalar–tensor theories of gravity

Abstract

In the present work we study a concrete model of scalar-tensor theory of gravity characterized by two free parameters, and we compare its predictions to observational data and constraints coming from supernovae, solar system tests and the stability of cosmic structures. First an exact analytical solution at the background level is obtained. Using that solution the expression for the turnaround radius is computed. Finally we show graphically how current data and limits put bounds on the parameters of the model at hand.

Anisotropic stars made of exotic matter within the complexity factor formalism

“…We can classify recent DE cosmological models into two generic categories: (i) alternative theories of gravity for which the solutions have additional corrective terms compared to the standard case; (ii) by employing a new dynamical degree of freedom by means of a convenient equation-of-state. In the first class of models, one finds, for instance, Scalar-Tensor theories of gravity [20][21][22][23], brane-world models [24][25][26][27][28] and f(R) theories of gravity [29][30][31][32]; and for the second class, one finds models such as k-essence [33], phantom [34], quintessence [35], quintom [36], or tachyonic [37]. For a good review article on the dynamics of dark energy see for instance [38].…”

Anisotropic stars made of exotic matter within the complexity factor formalism

“…We can classify recent DE cosmological models into two generic categories: (i) alternative theories of gravity for which the solutions have additional corrective terms compared to the standard case; (ii) by employing a new dynamical degree of freedom by means of a convenient equation-of-state. In the first class of models, one finds, for instance, Scalar-Tensor theories of gravity [20][21][22][23], brane-world models [24][25][26][27][28] and f(R) theories of gravity [29][30][31][32]; and for the second class, one finds models such as k-essence [33], phantom [34], quintessence [35], quintom [36], or tachyonic [37]. For a good review article on the dynamics of dark energy see for instance [38].…”

Vacuum Energy in Saez-Ballester Theory and Stabilization of Extra Dimensions

“…They can be regarded as a possible contributing factor in the late time acceleration of the universe [56]. STT is of direct generalization and extension of general relativity [57]. STT can be considered as a perfect candidate for DE [58].…”