Is the universe's end nigh? New physics suggests a much shorter lifespan
A recent study challenges long-held beliefs about the universe's lifespan, suggesting it may fade into darkness far sooner than previously thought. Researchers at Radboud University in the Netherlands have calculated that the universe's end could arrive in just 10^78 years, a one followed by 78 zeros, a timescale so vast it's hard to fathom. This is a dramatic contrast to the previous estimate of 10^110 years.
The study revisits the concept of Hawking radiation, a famous idea in modern physics proposed by Stephen Hawking in 1975. Hawking suggested that black holes lose mass over time due to the escape of particles from their edges, a process known as Hawking radiation. This radiation is now believed to apply not just to black holes but to all compact massive objects, including white dwarfs and neutron stars.
The key claim of the Radboud team is that these stellar remnants will also evaporate, extremely slowly, through a radiation process dependent solely on density. If spacetime is curved strongly enough by mass, they argue, all objects with a gravitational field should be able to evaporate. This means the final objects in the universe won't last anywhere near 10^110 years. Instead, the new calculation suggests a lifespan of around 10^78 years.
This revised timeline is a result of the study's focus on the role of spacetime curvature around any massive object. Hawking's original insight applied to event horizons, but the Radboud calculations suggest a broader application. The rate of evaporation depends chiefly on density, with less dense objects evaporating far more slowly and very dense ones evaporating much faster.
Applying this rule to the final population of compact remnants, the evaporation clock runs out sooner than previously thought. The previous overestimate of 10^110 years came from ignoring the possibility of white dwarfs and neutron stars. Once these objects are included, the cosmic clock runs out much sooner, though it remains far beyond any imaginable human or galactic timescale.
Co-author Walter van Suijlekom emphasized the interdisciplinary nature of the work, blending astrophysics, mathematics, and quantum physics. The project aims to better understand the theory and perhaps one day unravel the mystery of Hawking radiation.
Despite the revised estimate, daily life and the future of humanity remain unchanged. This is deep-time cosmology, dealing with timelines so vast they stop feeling like time. The new work shifts the theoretical picture, suggesting Hawking radiation plays a much bigger role in the universe's long-term fate than previously assumed.
The study doesn't imply the universe is dying faster in any noticeable way. Instead, it tightens the timeline by linking the universe's final moments to the slow fade-out of the last neutron stars and white dwarfs. The idea is stark and abstract: once those final stellar remnants evaporate, there will be no luminous matter left, a process that will take 10^78 years.
