# The oscillating dark energy and cosmological Casimir effect

## TL;DR

This paper explores how the dynamical cosmological Casimir effect influences oscillating and phantom universes, showing it accelerates the approach to Big Rip singularity but is not crucial near the singularity itself.

## Contribution

It provides an analysis of the Casimir effect's impact on the evolution and timing of the Big Rip in oscillating and phantom cosmological models.

## Key findings

- Casimir effect accelerates the universe's approach to Rip time.
- Casimir fluid can alter the timing of the Big Rip.
- Near the Big Rip, Casimir effect's role diminishes.

## Abstract

The role of dynamical cosmological Casimir effect to phantom (constant $w$) and oscillating Universe is discussed. It is shown explicitly that its role is not essential near to Big Rip singularity. However, the account of Casimir fluid makes the scale factor approach to Rip time to be faster. Rip time itself maybe changed too.