# E=mc$^2$ and the negative pressure of Dark Energy

## TL;DR

This paper proposes a new type of particles that could explain Dark Energy by exhibiting gravitational effects similar to a negative pressure fluid, challenging the conventional cosmological constant approach.

## Contribution

It introduces a novel class of particles that mimic Dark Energy's gravitational effects without requiring negative thermodynamical pressure.

## Key findings

- Particles can produce gravitational effects of Dark Energy
- Gas of these particles has positive thermodynamical pressure
- Potential alternative to cosmological constant

## Abstract

According to recent observations, the Dark Energy would represent 70% of the content of our Universe. The most popular way to account for this Dark Energy make use of the Cosmological Constant introduced by Einstein. However, some uncertainty remain about the theoretical value this constant should have. Alternate approaches have to introduce a fluid whose pressure would be negative. In this paper, we present unusual particles which could form a gas with positive thermodynamical pressure, while presenting all the gravitational characteristics of Dark Energy.