Physics Maths Engineering
Elucidation of ‘Cosmic Coincidence’
rnfinity
Meir Shimon
Related Subjects
Abstract
In the standard cosmological model the dark energy (DE) and nonrelativistic (NR) matter densities are determined to be comparable at the present time, in spite of their greatly different evolution histories. This ‘cosmic coincidence’ enigma could be explained as a non-anthropic observational selection effect: We show that in a suitably chosen frame the Universe is at its most probable epoch when the Hubble radius attains a maximum, at the epoch when the energy densities of DE and NR matter are comparable.
Key Questions
What is the focus of the article "Elucidation of ‘Cosmic Coincidence’"?
The article aims to explore the so-called "cosmic coincidence," which refers to the unexpected and finely-tuned relationship between the energy densities of dark energy and matter in the universe at the present time.
What is the "cosmic coincidence" problem?
The "cosmic coincidence" refers to the puzzling observation that the energy densities of dark energy and matter are comparable in magnitude today, even though their respective contributions to the universe's energy budget should have evolved differently over time.
Why is the cosmic coincidence significant in cosmology?
The cosmic coincidence problem is significant because it challenges our understanding of the evolution of the universe and the fundamental nature of dark energy, which dominates the current expansion of the universe.
How does the article address the cosmic coincidence problem?
The article investigates various theoretical models that could explain the cosmic coincidence, including modifications to the standard cosmological model, such as dynamical dark energy or interactions between dark energy and dark matter.
What are the potential explanations for the cosmic coincidence?
Potential explanations include the possibility that dark energy and matter have been dynamically coupled over time, or that the universe is in a special epoch where the energy densities of dark energy and matter are naturally comparable.
How does this research impact the understanding of dark energy?
This research contributes to the understanding of dark energy by examining potential modifications to current cosmological models and offering new perspectives on the role of dark energy in the universe’s accelerated expansion.
What are the implications for future cosmological models?
Future cosmological models may incorporate alternative theories to explain the cosmic coincidence, potentially leading to new insights about the nature of dark energy, the fate of the universe, and the forces that govern cosmic evolution.
