Topic
The phenomenon believed to drive the accelerating expansion of the universe and the theories proposed to explain it.
Istanbul Technical University physicists found a branch of f(T) gravity where effective dark energy was negative until about 9.5 billion years ago. It offers a candidate mechanism for the sign-switching dark energy that earlier analyses found consistent with DESI data.
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Canada's CHIME telescope has detected the faint radio glow of hydrogen from about 9 billion years ago using only its own observations. The University of British Columbia says that opens a cheaper path to studying dark energy, once the hydrogen maps are turned into a history of cosmic expansion.
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CHIME, a Canadian radio telescope, detected the 21 cm glow of distant hydrogen in 94 nights of its own data, without checking against any other telescope. The team sees a cheaper route to studying dark energy, though so far the paper establishes only that the signal is real.
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CHIME, a Canadian radio telescope, detected the faint glow of hydrogen from a universe about 5 billion years old using 94 nights of its own data. Any test of dark energy theories comes later, from years of archived observations still to be analysed.
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NASA says the Wide Field Instrument and the coronagraph are both working in space. The two published accounts of the milestone disagree about when science observations start and how long the mission runs.
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Shin'ichi Nojiri and S.D. Odintsov argue in Physics of the Dark Universe that negative mass does not always make general relativity inconsistent, on assumptions that include a negative cosmological constant.
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The Wide Field Instrument passed its first in-flight tests of detectors, calibration source, filter wheel and focus, and NASA says first science images are still expected by early 2027 with months of commissioning left.
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The five-year survey covers about 75 percent of the sky and roughly 4 billion objects, and what shows it has landed as a product is the 1,800 papers already citing it.
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A Physical Review D paper argues cosmic acceleration is a residue of quantum uncertainty acting on geometry, which would turn two unsolved problems into one. Upcoming surveys are the test.
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