# Cosmic acceleration from string induced Galileons

@article{Easson2021CosmicAF, title={Cosmic acceleration from string induced Galileons}, author={Damien A. Easson and Tucker Manton and Andrew Svesko}, journal={Journal of Cosmology and Astroparticle Physics}, year={2021}, volume={2021} }

It has been shown a specific Horndeski theory of gravity arises from a consistent Kaluza-Klein reduction of the gravi-dilaton sector of the low-energy effective heterotic string action with a first α' correction. Here we provide a first investigation of the cosmological solutions to the lower dimensional theory by constructing exact solutions to the field equations in various frames. At tree level, in string frame, we find the duality symmetry of the parent theory is unaltered by dimensional… Expand

#### References

SHOWING 1-10 OF 96 REFERENCES

Accelerating universes in string theory via field redefinition

- Physics
- 2012

We study cosmological solutions in the effective heterotic string theory with α′-correction terms in the string frame. It is pointed out that the effective theory has an ambiguity via field… Expand

The stringy origins of Galileons and their novel limit

- Physics
- 2021

We show generalized Galileons — a particular subclass of Horndeski gravity — arise from a consistent Kaluza-Klein reduction of the low-energy effective action of heterotic string theory to first… Expand

Remarks on Tachyon Driven Cosmology

- Physics
- 2003

We begin by reviewing the results on the decay of unstable D-branes in type II string theory, and the open-closed string duality proposal that arises from these studies. We then apply this proposal… Expand

Elements of string cosmology

- Physics
- 1992

Abstract Aspects of string cosmology for critical and non-critical strings are discussed emphasizing the necessity to account for the dilaton dynamics for a proper incorporation of “large-small”… Expand

Pre-big-bang in string cosmology

- Physics
- 1993

The duality-type symmetries of string cosmology naturally lead us to expect a pre-big-bang phase of accelerated evolution as the dual counterpart of the decelerating expansion era of standard… Expand

Superstring Modifications of Einstein's Equations

- Physics
- 1986

The modifications of the classical equations of motion of the gravitational field in type II string theory are derived by studying tree-level gravitational scattering amplitudes. The effective… Expand

TOWARDS A NON-SINGULAR PRE-BIG BANG COSMOLOGY

- Physics
- 1996

Abstract We discuss general features of the β-function equations for spatially flat, (d+ 1)-dimensional cosmological backgrounds at lowest order in the string-loop expansion, but to all orders in α′.… Expand

Inflation driven by the Galileon field.

- Physics, Medicine
- Physical review letters
- 2010

It is shown that (almost) scale-invariant curvature fluctuations can be generated even in the exactly de Sitter background and that the tensor-to-scalar ratio can take a significantly larger value than in the standard inflation models, violating the standard consistency relation. Expand

Self-accelerating universe in Galileon cosmology

- Physics
- 2009

We present a cosmological model with a solution that self-accelerates at late times without signs of ghost instabilities on small scales. The model is a natural extension of the Brans-Dicke (BD)… Expand

Horndeski stars

- Physics
- Journal of Cosmology and Astroparticle Physics
- 2021

We establish the existence of time-dependent solitons in a modified gravity framework, which is defined by the low energy limit of theories with a weakly broken galileon symmetry and a mass term.… Expand