An
international team of researchers led by the University of Portsmouth
has found that the nature of dark energy may not be the cosmological
constant proposed by Albert Einstein a century ago.
The
physical property of dark energy is represented by its Equation of State
(EoS), which is the ratio of pressure and energy density of dark
energy. According to traditional dark matter models, dark energy is a
cosmological constant (e.g. the vacuum energy, with a constant EoS of
-1).
The team, led by Professor Gong-Bo Zhao at the University
of Portsmouth, found evidence of a dynamical dark energy at a
significant level of 3.5 sigma (much higher than normal). These
measurements came from a study concerning the Baryonic Acoustic
Oscillations published in 2016 by the SDSS-III Collaboration.
“Since
its discovery at the end of last century, dark energy has been a riddle
wrapped in an enigma,” said co-author Professor Bob Nichol, Director of
the Institute of Cosmology and Gravitation at the University of
Portsmouth. “We are all desperate to gain some greater insight into its
characteristics and origin. Such work helps us make progress in solving
this 21st century mystery.”
Read more about this fascinating story at: http://www.sci-news.com/astronomy/dynamical-dark-energy-05282.html
Image Credit: NASA / ESA / JPL-Caltech / Yale / CNRS.
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Friday, October 6, 2017
NEW EVIDENCE SUPPORTING DYNAMICAL DARK ENERGY
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