Einstein field equations under spherically symmetric space-times are considered here in connection to dark energy investigation. A set of solutions are obtained for a kinematical Λ model, viz., Λ ∼ (ȧ/a) without assuming any a priori value for the curvature constant and the equation of state parameter ω. Some interesting results, such as the nature of cosmic density Ω and deceleration parameter...

The combination of general relativity (GR) and the Standard Model of particle physics disagrees with numerous observations on scales from our Solar System up. In the canonical concordance model of Lambda cold dark matter (ΛCDM) cosmology, many of these contradictions between theory and data are removed or alleviated by the introduction of three completely independent new components of stress en...

It is found that dark energy emerges spontaneously from the higherderivative gravity. According to cosmological scenario, obtained here, the universe inflates for ∼ 10−37sec. in the beginning and late universe accelerates after 8.58Gyrs. During the long intermediate period, it decelerates driven by radiation and subsequently by matter. Emerged gravitational dark energy mimics quintessence and i...

Modified f (R) gravity in the Palatini approach has been presently applied to Cosmology as a realistic alternative to dark energy. In this concern, a number of authors have searched for observational constraints on several f (R) gravity functional forms using mainly data of type Ia supenovae (SNe Ia), Cosmic Microwave Background (CMB) radiation and Large Scale Structure (LSS). In this paper, by...

A cosmological scenario is proposed, which simultaneously solves the mass hierarchy and the small dark energy problem. In the present scenario an effective gravity mass scale (inverse of the Newton’s constant) increases during the inflationary period. The small cosmological constant or the dark energy density in the present universe is dynamically realized by introducing two, approximately O(2)...

Here in this ‘paper’ a deeper analysis of the ‘dark energy force formula’ in the Double Torus Cosmology is made. Earlier ‘papers‘ were posted as ‘pre-papers‘ in the vixra-archive. These are subject to a new cosmological hypothesis, being further described in higher order mathematics in the near future by Christopher Forbes. I have found evidence through an unexpected interpretation of CMB resul...

The problem of explaining the acceleration of the expansion of the universe and the observational and theoretical difficulties associated with dark matter and dark energy are discussed. The possibility that GR does not correctly describe the large-scale structure of the universe is considered and an alternative gravity theory is proposed as a possible resolution to the problems. e-mail: moffat@...

We argue that Einstein gravity coupled to a Born-Infeld theory provides an attractive candidate to represent dark matter and dark energy. For cosmological models, the BornInfeld field has an equation of state which interpolates between matter, ω = 0 (small times), and a cosmological constant ω = −1 (large times). On galactic scales, the BornInfeld theory predicts asymptotically flat rotation cu...