# Cosmic acceleration from first principles

@article{GarcaBellido2021CosmicAF, title={Cosmic acceleration from first principles}, author={Juan Garc{\'i}a-Bellido and Llorenc Espinosa-Portales}, journal={Physics of the Dark Universe}, year={2021} }

General relativistic entropic acceleration theory may explain the present cosmic acceleration from first principles without the need of introducing a cosmological constant. Following the covariant formulation of non-equilibrium phenomena in the context of a homogeneous and isotropic FriedmannLemaitre-Robertson-Walker (FLRW) metric, we find that the growth of entropy associated with the causal horizon of our universe (inside a finite bubble in eternal inflation) induces an acceleration that is… Expand

#### References

SHOWING 1-10 OF 29 REFERENCES

The cosmological constant as a zero action boundary

- Physics
- 2021

The measured cosmological constant Λ is usually interpreted as Dark Energy (DE) or modified gravity (MG). Here we propose instead that Λ corresponds to a boundary term in the action of classical… Expand

Covariant formulation of non-equilibrium thermodynamics in General Relativity

- Physics
- Physics of the Dark Universe
- 2021

We construct a generally-covariant formulation of non-equilibrium thermodynamics in General Relativity. We find covariant entropic forces arising from gradients of the entropy density, and a… Expand

Theory of cosmological perturbations

- Physics
- 1992

We present in a manifestly gauge-invariant form the theory of classical linear gravitational perturbations in part I, and a quantum theory of cosmological perturbations in part II. Part I includes… Expand

A covariant entropy conjecture

- Physics
- 1999

We conjecture the following entropy bound to be valid in all space-times admitted by Einstein's equation: let A be the area of any two-dimensional surface. Let L be a hypersurface generated by… Expand

Action Integrals and Partition Functions in Quantum Gravity

- Physics
- 1977

One can evaluate the action for a gravitational field on a section of the complexified spacetime which avoids the singularities. In this manner we obtain finite, purely imaginary values for the… Expand

The world as a hologram

- Physics
- 1994

According to ’t Hooft the combination of quantum mechanics and gravity requires the three‐dimensional world to be an image of data that can be stored on a two‐dimensional projection much like a… Expand

Cosmology and fundamental physics with the Euclid satellite

- Physics, Medicine
- Living reviews in relativity
- 2018

This review is meant to provide a guide to the scientific themes that will underlie the activity of the group during the preparation of the Euclid mission and discusses five broad topics: dark energy and modified gravity, dark matter, initial conditions, basic assumptions and questions of methodology in the data analysis. Expand

The expansion of the Universe is faster than expected

- Physics
- 2019

The present rate of the expansion of our Universe, the Hubble constant, can be predicted from the cosmological model using measurements of the early Universe, or more directly measured from the late… Expand

More out of less: an excess integrated Sachs–Wolfe signal from supervoids mapped out by the Dark Energy Survey

- Physics
- Monthly Notices of the Royal Astronomical Society
- 2019

The largest structures in the cosmic web probe the dynamical nature of dark energy through their integrated Sachs–Wolfe imprints. In the strength of the signal, typical cosmic voids have shown good… Expand

ROLE OF CONFORMAL THREE-GEOMETRY IN THE DYNAMICS OF GRAVITATION.

- Physics
- 1972

The unconstrained dynamical degrees of freedom of the gravitational field are identi- fied with the conformally invariant three-geometries of spacelike hypersurfaces. New results concerning the… Expand