Delta_V

A joint research team has successfully demonstrated the complete confinement of mechanical waves within a single resonator—something long thought to be theoretically impossible...Many technologies around us—from smartphones and ultrasound devices to radios—rely on resonance, a phenomenon in which waves are amplified at specific frequencies. However, typical resonators gradually lose energy over time, requiring constant energy input to maintain their function..."We have broken a long-standing theoretical boundary," said Professor Junsuk Rho, who leads the research. "While this is still in the fundamental research phase, the implications are significant—from low-loss energy devices to next-generation sensing and signal technologies."

...According to the standard cosmological model, small galaxies merge over time in a chaotic process to form larger ones, leaving behind swarms of faint dwarf galaxies that orbit massive host galaxies in an almost random arrangement...Instead of being randomly spread around their host galaxy, as the standard model of cosmology predicts, over 80% of these dwarf galaxies are concentrated on one side of the Andromeda galaxy...Specifically, all but one of Andromeda's satellites lie within 107 degrees of the line pointing towards the Milky Way, a region covering only 64% of the host galaxy's surroundings..."We have to look at more than three hundred simulated systems to find just one that is similarly extreme in its asymmetry as observed." This makes Andromeda an extreme outlier, defying cosmological expectations.

...there are two different ways to measure this cosmic expansion rate, and they don’t agree. One method looks deep into the past by analyzing cosmic microwave background radiation, the faint afterglow of the Big Bang. The other studies Cepheid variable stars in nearby galaxies, whose brightness allows astronomers to map more recent expansion.

You’d expect both methods to give the same answer. Instead, they disagree—by a lot. And this mismatch is what scientists call the Hubble tension...Webb’s data agrees with Hubble’s and completely rules out measurement error as the cause of the discrepancy. It’s now harder than ever to explain away the tension as a statistical fluke. This inconsistency suggests something big might be missing from our understanding of the universe - something beyond current theories involving dark matter, dark energy, or even gravity itself. When the same universe appears to expand at different rates depending on how and where you look, it raises the possibility that our entire cosmological model may need rethinking.

...Scientists have believed dark energy was a "cosmological constant," but it is actually changing over time in unexpected ways...current data shows that, at the beginning of the universe, dark energy was very strong. But it has weakened with time and will continue to do so...The new research builds on data released from DESI in April 2024 that found signs that dark energy was changing. DESI has been surveying the universe for four years and an analysis of five years' worth of data is next for its research

I've recently noticed that downvotes don't stick for the community Greentext@sh.itjust.works.

Bug or design choice? Is there a work around? My account is with lemmy.world - do I need to log into a different instance to have full downvote capability?

SOLVED - they banned me for downvoting their fascist frogs

you can't trust the system

BEEEEES!