By using the equivalence between metric and Palatini f(R) (or “modified”) gravities with ω = 0,−3/2 Brans-Dicke theories, it is shown that the EhlersGeren-Sachs theorem of general relativity is extended to modified gravity. In the case of metric f(R) gravity studied before, this agrees with previous literature.

The curvaton reheating in a non-oscillatory inflationary universe model is studied in a JordanBrans-Dicke theory. For different scenarios, the temperature of reheating is computed. The result tells us that the reheating temperature becomes practically independent of the Jordan-Brans-Dicke parameter w. This reheating temperature results to be quite different when compared with that obtained from...

We have studied the Generalised Brans-Dicke theory and obtained exact solutions of a(t),φ(t), and ω(t) for different epochs of the cosmic evolution. We discuss how inflation,decceleration,cosmic acceleration can result from this solution.The time variation of G(t) is also examined .

We consider a modified “Swiss cheese” model in the Brans-Dicke theory, and discuss the evolution of black holes in the expanding universe. We define the black hole radius by the Misner-Sharp mass and find the time evolution for dust and vacuum universes.

We develop a new model of a spinning particle in Brans-Dicke space-time using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (by the Levi-Civita connection) along its worldline (an autoparallel of the metric-compatible connection) when neglecting spin-curvature coupling.

In scalar-tensor theories of gravity with torsion, the gravitational field is described in terms of a symmetric metric tensor g, a metriccompatible connection ∇ with torsion, and a scalar field φ. The main aim is to explore an interaction of a charged perfect fluid and a scalar field φ in a background electromagnetic and gravitational field described by {g, ∇, φ}. The interaction is based on an...

Abstract The field equations of Brans–Dicke conformal-invariant theory in (2+1)-dimensions are highly nonlinear and difficult to solve directly. They related those Einstein–dilaton theory, where the solutions can be obtained easily, by use a mathematical tool known as conformal transformation. exact three-dimensional which from their Einstein-dilaton counterparts, give two novel classes black h...

In this cosmological model, we have studied the spatially homogeneous and anisotropic Bianchi type axially symmetric model filled with dark matter energy in Brans-Dicke’s [1] theory of gravitation. Here, consider modified holographic Ricci defined by Chen Jing [21] as suitable condition energy. To obtain a solution assumed scale factor used Mishra et al. [43]. We solved field equations Brans-Di...

Mustard bran is enriched with bioactive phenolic compounds and glucosinolates, yet it underutilized as a low-value processing by-product. Here, we investigate the effects of solid-state fermentation (SSF) using various food-grade microorganisms (Aspergillus spp., Rhizopus Bacillus subtilis, Saccharomyces cerevisiae) on phytochemical composition antioxidant activities oriental mustard yellow bra...

Bioethanol has been successfully produced from sorghum (Sorghum bicolor L.) seed dregs as a biofuel to replace fossil fuels. The goal of this study is find out what sulfuric acid concentration produces sugar content during hydrolysis utilizing microwave and an autoclave. concentrations used in experiment were 0.5, 1, 2, 5%. brans suspended with solution, then the using (temperature 150°C for 30...