An exact scalar field inflationary cosmological model which solves Cosmological constant problem and dark matter problem in addition to Horizon and Flatness problems and other problems of inflationary cosmology

TL;DR

This paper presents an exact scalar field inflationary cosmological model that addresses multiple fundamental problems in cosmology, including the cosmological constant, dark matter, horizon, and flatness issues, without relying on approximations.

Contribution

It introduces a novel exact solution approach to inflationary models, providing comprehensive explanations for key cosmological phenomena and predicting dark matter and energy densities accurately.

Findings

Successfully solves horizon and flatness problems.

Provides a precise estimate of dark matter and energy densities.

Addresses the cosmological constant problem by 120 orders of magnitude.

Abstract

An exact scalar field cosmological model is constructed from the exact solution of the field equations. The solutions are exact and no approximation like slow roll is used. The model gives inflation, solves horizon and flatness problems. The model also gives a satisfactory estimate of present vacuum energy density and solves cosmological constant problem of 120 orders of magnitude discrepancy of vacuum energy density. Further, this model predicts existence of dark matter/energy and gives an extremely accurate estimate of present energy density of dark matter and energy. Alongwith explanations of graceful exit, radiation era, matter domination, this model also indicates the reason for present accelerated state of the universe. In this work a method is shown following which one can construct an infinite number of exact scalar field inflationary cosmological models.