We study the quantum effects of a test Klein-Gordon field in a Vaidya spacetime consisting of a collapsing null shell that forms a Schwazschild black hole, by explicitly obtaining, in a $(1+1)$-dimensional model, the Wightman function, the renormalised stress-energy tensor, and by analysing...
Webb's powerful mirrors will allow scientists to look at galaxy formation — including the role of dark matter — up close. While this investigation doesn't directly answer how many galaxies there are in the universe, it does help scientists better understand the processes behind the galaxies we...
But how many weeks are there in a year? Generally, there are 52 weeks and one additional day in a regular year. In a leap year, which occurs almost every four years, there are 52 weeks and two additional days. When did we decide there are 52 weeks in a year? The story of how we...
there's another big differentiator that determines their practicality. Most classical computers are affordable, smaller than a breadbox and able to run in offices and other traditional business environments. Quantum computers, in contrast, are typically car-sized and extremely resource...
Is there a hole in the universe? Sources Share: Citation More Awesome Stuff Up Next What Are Dark Matter and Dark Energy? Explore More Science Dictionary Just How Many Galaxies Are in the Universe? Space The Milky Way: Understanding Our Place in the Galaxy Space What is the universe...
Many researchers are looking for alternatives, both for lithium and for the materials used as electrolytes. Solid-state electrolytes show promise for their stability and safety. Surprising results The newly discovered material PNNL scientists are currently testing uses both lithium and sodium, a...
“You can have a career in research, or work in industry, but there are so many different quantum technologies that are coming onto the market, at different stages of development. You can work on software or hardware or engineering; you can do communications; you can work on developing ...
Because of this, many of the flight simulators they use are different from one another. Often, this can cause difficulty when linking systems together -- simulated enemies may not appear in the same point of space for multiple pilots, for example. Currently, there's a big push to create ...
It seemed pretty clear during OTAs that tight end Darren Waller is destined to be the Giants' No. 1 pass-catcher. The wide receiver position remained murky. Even with Sterling Shepard and Wan'Dale Robinson rehabbing serious knee injuries, there are a lot of...
We need a new quantum theory, which unifies gravity with the other forces of nature. Many people claim that it is string theory, but I have my doubts. So far about the only prediction is that space-time has ten dimensions. 我们需要一个新的量子理论,将重力和其他自然界的其它力量整合在一起...