Speculative but at least seem to account for current observations, so far anyway. Usually newspaper + unpublished arXiv paper = nonsense.
I think the article title is a bit sensationalist since in this case the universe is still expanding in any meaningful sense; distance between galaxies measured by measuring sticks is increasing. This just uses math to trade a singularity for a scalar field. But that might be a good thing.
Interested to see if it gets published.
__________________ Uncertainty is an uncomfortable position.
But certainty is an absurd one.
Speculative but at least seem to account for current observations, so far anyway. Usually newspaper + unpublished arXiv paper = nonsense.
I think the article title is a bit sensationalist since in this case the universe is still expanding in any meaningful sense; distance between galaxies measured by measuring sticks is increasing. This just uses math to trade a singularity for a scalar field. But that might be a good thing.
Interested to see if it gets published.
Isn't his suggestion that this is not the case, or that it is not necessarily the case? I'm not sure how you get that.
__________________
"If stupidity got us into this mess, then why can't it get us out?"
Isn't his suggestion that this is not the case, or that it is not necessarily the case? I'm not sure how you get that.
If I understand it the distances still increase, they just increase because in his theory everything is getting smaller, due to mass being a result of particles coupling to his cosmon field and increasing exponentially.
Quote:
Originally Posted by From the paper's abstract
We discuss a cosmological model where the universe shrinks rather than expands during the radiation and matter dominated periods. Instead, the Planck mass and all particle masses grow exponentially, with the size of atoms shrinking correspondingly. Only dimensionless ratios as the distance between galaxies divided by the atom radius are observable. Then the cosmological increase of this ratio can also be attributed to shrinking atoms
__________________ Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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a year-long time-lapse study of the sky. A camera installed on the roof of the Exploratorium museum in San Francisco captured an image of the sky every 10 seconds.
At that moment, as I turn ‘upside-down’, two things happen: the Sun sets, and my ability to see – already compromised by the water – completely vanishes, making my eyes useless; but worse than that, the water covers my nose – a really awful sensation that I make worse by my vain attempts to move the water by shaking my head. By now, the upper part of the helmet is full of water and I can’t even be sure that the next time I breathe I will fill my lungs with air and not liquid. To make matters worse, I realise that I can’t even understand which direction I should head in to get back to the airlock. I can’t see more than a few centimetres in front of me, not even enough to make out the handles we use to move around the Station.
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Ununpentium will squeeze in between flerovium and livermorium, elements 114 and 116, respectively, which were added just last year.
For decades, scientists have been smashing atoms into one another, hoping two elements will fuse and form—at least briefly—a new, heavier element. That’s what happened in 2004 when physicists from Russia and the United States bombarded americium—atomic number 95—with calcium ions—atomic number 20. The two stuck together for 100 fleeting milliseconds. Ununpentium was born.
But it wasn’t immediately added to the periodic table. That’s because scientists require independent confirmation before that can happen. Which it didn’t for a long time. At long last, here’s Kenneth Chang, reporting for the New York Times:
A Swedish university announced Tuesday that that had finally happened. The new work, led by physicists at Lund University in Sweden and performed at an accelerator in Darmstadt, Germany, duplicated the earlier experiment and observed the similar patterns of debris. The new findings will be published Thursday in the journal Physical Review Letters.
An element believed to be crucial to the origin of life would only have been available on the surface of the Red Planet, it is claimed.
Geochemist Professor Steven Benner argues that the "seeds" of life probably arrived on Earth in meteorites blasted off Mars by impacts or volcanic eruptions.
"It's only when molybdenum becomes highly oxidised that it is able to influence how early life formed," said Prof Benner, from The Westheimer Institute for Science and Technology in the USA. "This form of molybdenum couldn't have been available on Earth at the time life first began, because three billion years ago the surface of the Earth had very little oxygen, but Mars did.
Maybe I'm a bit naive, but I would imagine the probability of a chip breaking off Mars and hitting Earth would be much lower than other methods of molybdenum getting oxidized, or oxidized molybdenum getting to earth via random meteor
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The canyon has the characteristics of a winding river channel and is at least 460 miles (750 kilometers) long, making it longer than the Grand Canyon. In some places, it is as deep as 2,600 feet (800 meters), on scale with segments of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.
The canyon has the characteristics of a winding river channel and is at least 460 miles (750 kilometers) long, making it longer than the Grand Canyon. In some places, it is as deep as 2,600 feet (800 meters), on scale with segments of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.
Would be interested to discover what creatures have evolved there.
Scientists dissolve a meteorite discovered in California in conditions imitating an underwater thermal vent on Earth and discover that the building blocks of life were formed...
BBC Science Club!
