When one conveys certain things, particularly of such gravity, should one not then appropriately cite sources, authorities...
QuoteA Cornell physicist has calculated that the universe may be nearing the halfway point of a total lifespan of about 33 billion years. Using newly released data from major dark energy observatories, he concludes that the cosmos will continue expanding for roughly another 11 billion years before reaching its largest size. After that, it would begin to shrink, eventually collapsing back into a single point, much like a stretched rubber band snapping back.
Henry Tye, the Horace White Professor of Physics Emeritus in the College of Arts and Sciences, arrived at this conclusion by updating a long standing model built around the "cosmological constant." This concept was first introduced more than a century ago by Albert Einstein and has been central to modern predictions about how the universe will evolve.
"For the last 20 years, people believed that the cosmological constant is positive, and the universe will expand forever," Tye said. "The new data seem to indicate that the cosmological constant is negative, and that the universe will end in a big crunch."
Tye is the corresponding author of "The Lifespan of our Universe," published in the Journal of Cosmology and Astroparticle Physics.
The universe is currently 13.8 billion years old and still expanding. Standard cosmology outlines two straightforward possibilities. If the cosmological constant is positive, expansion continues indefinitely. If it is negative, the universe would eventually stop growing, reach a maximum size, and then reverse direction, contracting until everything collapses to zero.
Tye's updated model supports the second outcome.
"This big crunch defines the end of the universe," Tye wrote. Based on his calculations, that collapse would occur in about 20 billion years.
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QuoteAbstract:
The Dark Energy Survey (DES) and the Dark Energy Spectroscopic Instrument (DESI) measurements claim that the dark energy equation of state w ≠ −1. This observation can be explained by the axion Dark Energy (aDE) model of an ultralight axion plus a cosmological constant Λ. Despite a relatively large degeneracy, there is a high probability that Λ < 0. This negative Λ leads the universe to end in a big crunch. Using the best-fit values of the model as a benchmark, we find the lifespan of our universe to be 33 billion years.
Back in the '80s I knew a guy who made knives as a hobby. He was headed out the door (his house) and a couple of evangelicals approached him. He said he was on his way to a Satanic ritual and showed them the knife he was going to sacrifice the baby with. He's a big burly guy and makes a great crazy face. They took off running.