Cosmology

Sheldon, our physics color commentator, writes to say, “I’ve mentioned before that Subir Sarkar at Oxford has questioned the existence of “dark energy” and by implication, the award of the 2011 Nobel prize. Sabine Hossenfelder’s blog links to a 7 minute summary of the Nobel prize and Sarkar’s work: But even more compelling is her 45 minute interview with Sarkar here: In the 45 minute interview, note (29:30) how cosmologists assume dark energy in order to prove dark energy. It is a logic popularized by Darwinists but in my experience, it is also endemic in all fields of physics. For some reason, in all the effusive praise for the scientific method by both educators and scientists alike, no one ever Read More ›

Involving quantum mechanics: In an enormously complicated 165-page paper, computer scientist Zhengfeng Ji and colleagues present a result that penetrates to the heart of deep questions about math, computing and their connection to reality. It’s about a procedure for verifying the solutions to very complex mathematical propositions, even some that are believed to be impossible to solve. In essence, the new finding boils down to demonstrating a vast gulf between infinite and almost infinite, with huge implications for certain high-profile math problems. Seeing into that gulf, it turns out, requires the mysterious power of quantum physics. Tom Siegfried, “How a quantum technique highlights math’s mysterious link to physics” at ScienceNews It’s not entirely clear why a link between physics and Read More ›

Mebbe, for now. According to Forbes: >>The red supergiant star Betelgeuse appears to have finally stopped its unprecedented dimming, Villanova University astronomer Edward Guinan told me [ Bruce Dorminey] this afternoon. He says that although he’s unsure what has caused its strange brightness fluctuations, Betelgeuse is not likely to undergo a supernova explosion anytime soon.  “The star has been nearly steady in brightness now over the last 10 days,” said Guinan. We could be at minimum brightness now and very soon the star will slowly brighten if it follows its normal 420 to 430 period of pulsation, says Guinan. Or when the star periodically changes its  brightness, he says. >> Of course, supernova fans are still rooting for a big boom. Read More ›

Since about October 2019, Betelgeuse (the bright reddish star at Orion’s shoulder in the brightest constellation in the sky that is about 600 – 700 ly distant from us) has begun a sharp dimming that has now gone beyond what has been seen in modern observations. As of the end of January, it was down about 2.5 1.4 in apparent magnitude (corrected from the added graph). Here is its “portrait” — it is one of the few stars we have seen as a disk: ADDED: a plot of apparent magnitude: Discussion at WUWT suggests that by about Feb 21 we should see an uptick if this is something that is near-normal. Odds are, we don’t have a long enough instrumented Read More ›