Cosmology on Compact and Stable Supergravity Background

TL;DR

This paper presents a cosmological model based on D3-branes in a supergravity background, addressing key cosmological problems and linking string theory to observable universe features through a dynamic evolution process.

Contribution

It introduces a novel string-theoretic cosmological model with a detailed evolution scenario, including inflation, matter creation, and dark energy, within a supergravity background of wrapped D7-branes.

Findings

Addresses horizon and flatness problems during decelerating expansion.

Generates primordial inhomogeneities with a red-tilted spectrum.

Proposes a mechanism for matter and dark energy emergence from brane collisions.

Abstract

We propose a cosmological model of D3-brane universe on compact and stable supergravity background of wrapped D7-branes in type IIB string theory previously argued to be dual to pure N=1 SU(N) gauge theory in four dimensions. A model universe of order Planck size near the UV boundary dynamically flows toward the IR with constant total energy density and accelerating expansion followed by smooth transition to decelerating expansion and collides with the wrapped D7-branes at the IR boundary. The model addresses the horizon and flatness problems with most of the expansion produced during the decelerating expansion phase. The inflationary scenario is used to generate sources of inhomogeneities in the cosmic microwave background radiation and seeds for large scale structure formation from quantum fluctuations which exit the Hubble radius early during the accelerating expansion phase and the model addresses the inhomogeneity problem with red tilt in the power spectrum. We propose that the kinetic energy of the model universe is converted to matter and radiation by the collision followed by formation of baryons that stabilizes the model universe against gravitational force from the background at a finite distance from the IR boundary with the wrapped D7-branes serving as sources of color. Friedmann evolution then takes over with a positive cosmological constant term coming from the remaining potential energy density which is interpreted as dark energy. The magnitude of dark energy density is smaller than the total energy density during the flow by a ratio of the scale factor when the model universe appears in the UV to the scale factor at the moment of collision and stays constant while the matter-radiation density falls during Friedmann expansion.