A GROUP of astronomers has sparked a major debate in the world of science after finding evidence the universe may no longer be expanding rapidly, as believed for almost three decades. On the contrary, the results of this latest research show that the expansion of the universe is actually starting to slow down, challenging the theory of the winner of the 2011 Nobel Prize in Physics which stated that the expansion of the universe continues to accelerate.
If these findings are correct, the consequences are extraordinary. The universe will not expand forever, but could reverse course towards total destruction in a scenario known as the “Big Crunch”, the opposite of the Big Bang.
This research was led by Prof. Young-Wook Lee from Yonsei University, South Korea, stated that his observations showed that dark energy, a mysterious force that was believed to be driving the accelerated expansion of the universe, appears to be weakening over time.
“Our study shows that the universe has entered a phase of slowing expansion in recent times and that dark energy is evolving much faster than expected,” Lee said. “If these results are confirmed, it would be a major shift in the cosmological paradigm since the discovery of dark energy 27 years ago.”
These findings may be met with skepticism, but interestingly, the DESI consortium, an influential cosmology research group, also reported similar conclusions earlier this year. This reopens a major debate about the origins of dark energy and the ultimate fate of the universe.
Lee and his team’s research highlights the weaknesses in the basic assumptions of type 1a supernova observations. Star explosions were used in the 1990s to measure the speed of the expansion of the universe and were the basis for the 2011 Nobel Prize in Physics.
According to Lee, “There are key assumptions that turn out to be wrong. It’s like buttoning a shirt from the wrong first button.”
Before the 1990s, scientists believed that gravity would slow the expansion of the universe. However, when a distant supernova appeared fainter than expected, scientists concluded that the universe was actually expanding faster.
Now, Lee and his team offer another explanation: stars in the early universe may have had different properties, producing naturally fainter supernovae. After taking these variations into account, the results show the universe is still expanding, but not as fast as before and dark energy is starting to weaken.
If dark energy continues to decrease to negative values, scientists predict the universe will collapse again in a Big Crunch.
Prof. Carlos Frenk of the University of Durham considered the results “very interesting and provocative.” He added, “It’s possible the results are wrong, but they cannot be ignored. They present intriguing findings with profound implications.” (The Guardian/Z-2)
