<i>f</i> ( <i>T</i> , <i>B</i> ) gravity in a Friedmann–Lemaître–Robertson–Walker universe with nonzero spatial curvature

Birth of a Closed Universe of Negative Spatial Curvature

We propose a modified form of the spontanteous birth of the universe by quantum tunneling. It proceeds through topology change and inflation, to eventually become a universe with closed spatial sections of negative spatial curvature and nontrivial global topology.

Inverse Curvature Gravity with Supernovae

We show that the current accelerated expansion of the Universe can be explained without resorting to dark energy. Models of generalized modified gravity, with inverse powers of the curvature can have late time accelerating attractors without conflicting with solar system experiments. We have solved the Friedman equations for the full dynamical range of the evolution of the Universe. This allows...

Quantum Gravity in a Model Universe

This report describes a hypothetical universe called Simple Absorption (SA). This model universe is defined on the basis of one underlying principle: a specific definition of absorption. In universe SA, two distributed entities can absorb each other to produce a third one. Starting from the equation governing the details of that absorption, it is possible to derive a surprising amount of physic...

Friedmann Universe in a Quantum Gravity Model

Cosmological perturbations in a gravity with quadratic order curvature couplings

where Lm is the matter part Lagrangian. The gravitational field equation is presented in Eq. (2) of [1]. The oneloop order quantum correction generically leads to curvature-square terms, and due to Gauss-Bonnet theorem the two terms in Eq. (1) completely account such corrections, [3]. In the literature, many works analyzed the roles of R term in the context of cosmological structure formation, ...