Dynamical dark energy

Dynamical dark energy has an energy density or equation-of-state parameter that changes with cosmic time, unlike a cosmological constant.

Table of contents
- Variable dark-energy equation of state Dynamical dark energy
  - Chevallier-Polarski-Linder parametrization Variable dark-energy equation of state

Variable dark-energy equation of state ( $w (z)$ )

For

P_{DE} = w (z) ρ_{DE}

, the continuity equation gives

ρ_{DE} (z) = ρ_{DE, 0} (1 + z)^{3} exp (3 \int_{0}^{z} \frac{w ( z ^{'} )}{1 + z ^{'}} d z^{'}) .

Chevallier-Polarski-Linder parametrization ( $w (a) = w_{0} + w_{a} (1 - a)$ )

The Chevallier-Polarski-Linder parametrization models dynamical dark energy by

w (a) = w_{0} + w_{a} (1 - a)

, equivalently

w (z) = w_{0} + w_{a} z / (1 + z)

.

 Ancestors (5)

 Incoming links (1)

Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 310 / 1 / b / Solution

 View article source

 Discussion (0)

There are no discussions about this article yet.

 Articles by others on the same topic (0)

There are currently no matching articles.

  See all articles in the same topic Create my own version