Recent studies, based on data from projects like the Dark Energy Survey (DES) and the Dark Energy Spectroscopic Instrument (DESI), suggest that our universe may meet its end significantly sooner than previously thought – in approximately 33 billion years. This bold prediction challenges the existing cosmological model, which posits a constant expansion of the universe driven by the cosmological constant.
Traditionally, it was believed that dark energy – the enigmatic force accelerating the universe's expansion – remained constant. However, new observations hint at a possible change in its behavior. If these data are confirmed, it would mean that dark energy is not a simple cosmological constant but rather evolves over time.
One of the hypothetical models presented in a new, pre-print paper suggests that dark energy is composed of two components: an axion (a hypothetical ultralight particle) and a cosmological constant with a smaller, negative value. In this model, axions initially drive the accelerated expansion. However, as they dilute, the negative cosmological constant takes over, leading to a deceleration, stop, and ultimately, a reversal of the universe's expansion into what's known as a "Big Crunch."
The "Big Crunch" is a catastrophic scenario where the universe begins to contract. Galaxies would merge, and the universe would become smaller, hotter, and denser, culminating in a singularity – a point of infinite density. According to this theory, the collapse would begin in about 10 billion years, with the final singularity being reached after a total lifetime of just over 33 billion years from the Big Bang.
It is crucial to note that these findings are preliminary and highly hypothetical. Further research and rigorous scrutiny by the scientific community are required to confirm them. Nevertheless, this research opens up fascinating prospects for our understanding of the universe's future and the nature of dark energy.
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