Qualitative evolution in higher-loop string cosmology

Qualitative evolution in higher-loop string cosmology

We investigate the evolution of the homogeneous and isotropic universe within the framework of the effective string gravity with string-loop modifications of dilaton couplings. In the case of barotropic perfect fluid as a nongravitational source the set of cosmological equations is presented in the form of the third-order autonomous dynamical system. The cases are considered when this system is...

Metaverse Loop-String Cosmology

Most theories of everything (TOEs) like string theory are based on physics. But there are as well TOEs based on "mathematics" being fundamental to a reality based on science. In particular, one math-TOE is based on the discrete natural numbers famously used by Godel to derive his Incompleteness Theorems. Such math computational theories (math-comp) assume that the comp-machine has an infinite c...

Higher Loop String Cosmology with Moduli and Antisymmetric Tensor Field

The classical evolution of a homogeneous cosmological model is investigated within the framework of low energy effective string gravity with higher genus corrections. Various conformal frames are considered. For the general case of correction functions in the Lagrangian we give the cosmological solutions with arbitrary curvature and dilaton, modulus and Kalb-Ramond fields. They generalize previ...

Loop Quantum Cosmology IV: Discrete Time Evolution

Using general features of recent quantizations of the Hamiltonian constraint in loop quantum gravity and loop quantum cosmology, a dynamical interpretation of the constraint equation as evolution equation is presented. This involves a transformation from the connection to a dreibein representation and the selection of an internal time variable. Due to the discrete nature of geometrical quantiti...

String Cosmology