A Cosmic Vision Beyond Einstein

TL;DR

This paper reviews the challenges of cosmic acceleration, explores potential new physics beyond Einstein's theory, and discusses how upcoming experiments will deepen our understanding of dark energy, dark matter, and gravity.

Contribution

It provides an overview of dark energy puzzles, compares various beyond Einstein models with current data, and highlights future experimental directions.

Findings

Current data constrains beyond Einstein models

Next-generation experiments will probe dark energy and gravity deeply

Understanding of cosmic acceleration remains incomplete

Abstract

The acceleration of the cosmic expansion is a fundamental challenge to standard models of particle physics and cosmology. The new physics of dark energy may lie in the nature of gravity, the quantum vacuum, or extra dimensions. I give a brief overview of the puzzles and possibilities of dark energy, and discuss the confrontation of a wide variety of "beyond Einstein" models with the latest data, showing what we currently know and what we must seek to learn. Next generation experiments using a variety of cosmological probes will deeply explore dark energy, dark matter, and gravitation.