Earth's most powerful telescope strengthens Big Bang theory
US: Scientists using the most powerful telescope on Earth has
discovered that the moments just after the Big Bang happened more like
the theory predicts, eliminating a significant discrepancy that troubled
physicists for two decades.
One of the most important problems in physics and astronomy was the
inconsistency between the lithium isotopes previously observed in the
oldest stars in our galaxy, which suggested levels about two hundred
times more Li-6 and about three to five time less Li-7 than Big Bang
nucleosynthesis predicts.
This serious problem in our understanding of the early universe has
invoked exotic physics and fruitless searches for pre-galactic
production sources to reconcile the differences.
The team, led by Karin Lind of the University of Cambridge, has
proven that the decades-old inventory relied on lower-quality
observational data with analysis using several simplifications that
resulted in spurious detections of lithium isotopes.
Using observations of ancient stars with W. M. Keck Observatory's
10-meter telescope and state-of-the-art models of their atmospheres has
shown that there is no conflict between their lithium-6 and lithium-7
content and predictions of the standard theory of Big Bang
nucleosynthesis, restoring thus the order in our theory of the early
universe.
The discovery that the universe was expanding by Edwin Hubble in the
1920s and subsequent observations suggest the universe began about 13.8
billion years ago in an event called the Big Bang. The fundamental
observations that corroborate the Big Bang are the cosmic microwave
radiation and the chemical abundances of the light elements described in
the Big Bang nucleosynthesis theory. "The predictions of Big Bang
nucleosynthesis have been one of the main successes of the standard Big
Bang model," said lead author Lind.
"Our findings remove much of the stark tension between 6Li and 7Li
abundances in stars and standard BBN, even opening up the door for a
full reconciliation. This further consolidates a model resting heavily
on the pillars of the cosmic microwave background and the expanding
universe," the researcher added.
HINDUSTAN TIMES
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