弦论科普
时间:2016-11-26 11:15:00作者: 刘进平的博文来源: http://blog.sciencenet.cn/blog-39731-1016876.html
弦论科普
What Every Layperson Should Know About String Theory
多重宇宙
Science
What is Cosmos doing sporting a cover story on parallel universes?
Carl Sagan once admonished that extraordinary claims require extraordinary evidence. We’re certainly not claiming to present such evidence, but our cover story
does address why some physicists consider that this darling of science fiction is nevertheless a respectable theory in science. They argue that Sagan’s admonishment
has been met, in a way, because the hypothesis for other worlds emerged from the extraordinary evidence of the quantum world. In our world, waves are waves and
particles are particles. But in the sub-atomic quantum world, there’s no such distinction. That reality is dramatically illustrated by experiments that show electrons - particles
of matter - interfere with each other
Cosmos Magazine
什么是CERN粒子加速器?
Science
What is the CERN Particle Accelerator?
What if it were possible to observe the fundamental building blocks upon which the Universe is based? All you would need is a massive particle accelerator, an
underground facility large enough to cross a border between two countries, and the ability to accelerate particles to the point where they annihilate each other - releasing
energy and mass which you could then observe with a series of special monitors. Well, as luck would have it, such a facility already exists, and is known as the CERN
Large Hardron Collider (LHC), also known as the CERN Particle Accelerator. Measuring roughly 27 kilometers in circumference and located deep beneath the surface
near Geneva, Switzerland, it is the largest particle accelerator in the world.
Universe Today
光在宇宙幼年还要快些
Science
When The Universe Was Young, Light May Have Been A Lot Faster
Either that, or gravity may have been a lot slower.
IBTimes