New research suggests the universe's lifespan may be drastically shorter than previously believed, potentially ending in a 'Big Crunch' in just 33 billion years.
Scientists have long theorized the universe would continue expanding for trillions of years. However, this new study reopens the possibility of cosmic expansion reversing, causing all matter and space-time to collapse into a dense state, similar to the Big Bang. This scenario, known as the 'Big Crunch,' was previously considered unlikely due to accelerating cosmic expansion.
The findings stem from analyzing dark energy, the force driving the universe's accelerated expansion. Recent data from the Dark Energy Survey (DES) and Dark Energy Spectroscopic Instrument (DESI) indicate that dark energy's 'equation of state' may be changing over time, rather than remaining static.
This dynamic dark energy behavior supports models like the axion dark energy (aDE) model, which proposes dark energy consists of both an axion field and a cosmological constant. When this hybrid model was applied to DES measurements, researchers found that the interplay between these forces could actively pull the universe back together in the distant future, leading to a Big Crunch.
Running simulations forward in time, researchers calculated a precise cosmic demise at 33.3 billion years. This contrasts sharply with the traditional trillion-year lifespan estimates. While the DES and DESI observations require verification, a negative cosmological constant and a resulting Big Crunch appear to be the most likely outcome in their analysis. Further data is needed to rigorously test this model and refine our understanding of the universe's ultimate fate.