# Dynamics of Tachyonic Dark Matter

## TL;DR

This paper explores the theoretical dynamics of tachyonic dark matter, showing it can influence cosmic evolution similarly to dark energy and dark matter, and suggests it as a potential candidate for dark matter in cosmology.

## Contribution

It develops Einsteinian kinetic theory and thermodynamics for a gas of dark tachyons, highlighting their possible role in cosmic evolution.

## Key findings

- Tachyonic gases can drive cosmic expansion in Friedmann-Robertson-Walker models.
- Tachyons exhibit unique density and pressure behaviors affecting universe dynamics.
- Tachyons may serve as viable dark matter candidates in cosmological models.

## Abstract

Usually considered highly speculative, tachyons can be treated via straightforward Einsteinian dynamics. Kinetic theory and thermodynamics for a gas of ``dark'' tachyons are readily constructed. Such a gas exhibits density and pressure which, for the dominant constituent of a suitable Friedmann-Robertson-Walker spacetime, can drive cosmic evolution with features both similar to and distinct from those of a standard dark-energy/dark-matter model. Hence, tachyons might bear further consideration as a cosmic dark-matter candidate.