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2019

$k$-evolution: a relativistic N-body code for clustering dark energy

Hassani, Farbod, Adamek, Julian, Kunz, Martin et al.

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We introduce $k$-evolution, a relativistic $N$-body code based on $\textit{gevolution}$, which includes clustering dark energy among its cosmological components.

To describe dark energy, we use the effective field theory approach.
In particular, we focus on $k$-essence with a speed of sound much smaller than unity but we lay down the basis to extend the code to other dark energy and modified gravity models.
We develop the formalism including dark energy non-linearities but, as a first step, we implement the equations in the code after dropping non-linear self-coupling in the $k$-essence field.

$k$-evolution: a relativistic N-body code for clustering dark energy · Around

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