How to accomplish inflation and a constant dark energy density

TL;DR

This paper proposes a novel multi-field gravity Lagrangian with a quotient of kinetic terms, enabling inflation and constant dark energy density without slow-roll or Einstein cosmological constant assumptions.

Contribution

It introduces a new form of Lagrangian with a quotient of kinetic terms, allowing inflation and dark energy modeling without traditional approximations or constants.

Findings

Inflation achieved with two scalars without slow-roll.

Constant dark energy density possible without Einstein cosmological constant.

New Lagrangian form alters standard multi-field gravity models.

Abstract

It is commonly assumed that the Lagrangian of multi-field theories of gravity contains the sum of kinetic terms of scalar fields. However, we propose here the Lagrangian contains not the sum but the quotient of kinetic terms. With this novel change, we find the inflationary universe can be acquired with two scalars without the slow-roll approximation. On the other hand, a constant dark energy density can also be achieved with two scalars while without the need of Einstein cosmological constant.