But will they invade your privacy? Go Further. Animals Wild Cities This wild African cat has adapted to life in a big city. Animals This frog mysteriously re-evolved a full set of teeth.
Animals Wild Cities Wild parakeets have taken a liking to London. Animals Wild Cities Morocco has 3 million stray dogs. Meet the people trying to help. Animals Whales eat three times more than previously thought. Environment Planet Possible India bets its energy future on solar—in ways both small and big. Environment As the EU targets emissions cuts, this country has a coal problem. Paid Content How Hong Kong protects its sea sanctuaries.
History Magazine These 3,year-old giants watched over the cemeteries of Sardinia. Magazine How one image captures 21 hours of a volcanic eruption. Science Why it's so hard to treat pain in infants.
Science The controversial sale of 'Big John,' the world's largest Triceratops. Science Coronavirus Coverage How antivirals may change the course of the pandemic.
They think something we have yet to detect directly is giving these galaxies extra mass, generating the extra gravity they need to stay intact. Unlike normal matter, dark matter does not interact with the electromagnetic force. This means it does not absorb, reflect or emit light, making it extremely hard to spot. In fact, researchers have been able to infer the existence of dark matter only from the gravitational effect it seems to have on visible matter. But what is dark matter?
The mysterious substance could also be as weighty as a primordial black hole — a hypothetical type of black hole that formed shortly after the Big Bang — "which can be several times the mass of the sun," said Gill, who was not involved in the new study. Exploring dark matter with any degree of precision has become possible only over the past few decades. Studies such as this one are important because they probe the frontier of what is already known about the enigmatic substance, Gill said.
But we've made incredible strides in a couple of decades, and we're going to keep making progress," he said. Mindy Weisberger is a Live Science senior writer covering a general beat that includes climate change, paleontology, weird animal behavior, and space. Mindy holds an M. The extra dimension can explain why dark matter has hidden so well from our attempts to study it in a lab.
In the world as we know it, length, width and depth constitute the three spatial dimensions. Time is often considered a dimension too, although it cannot be traversed in the same way. Many physics theories postulate that there are more dimensions that exist that aren't directly accessible; famously, string theory requires the existence of many additional dimensions, albeit they would be "small" dimensions that particles wiggle in and out of, not traversable ones like the three that humans know and love.
Tanedo argues that mathematical tricks, that don't mimic the behavior of visible particles, could help researchers better understand what's going on with dark matter. Hence, in Tanedo's theory, the intensity of the hypothetical "dark" force would have an unusual relationship to distance. Both magnetism and gravity decrease exponentially as objects with those properties move together or apart; whereas the the force between dark matter particles would vary in a different way.
Loeb added that this specific research paper in question suggests a novel origin for dark matter interactions which "stems from a sector of mediating particles hidden in extra dimensions. Their interactions could be described by a continuum of exchanged particles rather than just exchanging a single type of force particle.
Nicole Karlis is a staff writer at Salon.
0コメント