Friday, December 13, 2013

Today is

Friday the 13th - another urban legend.

Scientists Discover a Jewel at the Heart of Quantum Physics
Wired - December 12, 2013

Physicists reported this week the discovery of a jewel-like geometric object that dramatically simplifies calculations of particle interactions and challenges the notion that space and time are fundamental components of reality. The revelation that particle interactions, the most basic events in nature, may be consequences of geometry significantly advances a decades-long effort to reformulate quantum field theory, the body of laws describing elementary particles and their interactions. Interactions that were previously calculated with mathematical formulas thousands of terms long can now be described by computing the volume of the corresponding jewel-like 'amplituhedron,' which yields an equivalent one-term expression. The new geometric version of quantum field theory could also facilitate the search for a theory of quantum gravity that would seamlessly connect the large- and small-scale pictures of the universe.

In a "Rainbow" Universe Time May Have No Beginning  
Scientific American - December 12, 2013

What if the universe had no beginning, and time stretched back infinitely without a big bang to start things off? That's one possible consequence of an idea called "rainbow gravity," so-named because it posits that gravity's effects on space-time are felt differently by different wavelengths of light, aka different colors in the rainbow. Rainbow gravity was first proposed 10 years ago as a possible step toward repairing the rifts between the theories of general relativity (covering the very big) and quantum mechanics (concerning the realm of the very small). The idea is not a complete theory for describing quantum effects on gravity, and is not widely accepted. Nevertheless, physicists have now applied the concept to the question of how the universe began, and found that if rainbow gravity is correct, space-time may have a drastically different origin story than the widely accepted picture of the big bang. According to Einstein's general relativity, massive objects warp space-time so that anything traveling through it, including light, takes a curving path.

Collapse of the universe is closer than ever before  
PhysOrg - December 12, 2013

Sooner or later a radical shift in the forces of the universe will cause every little particle in it to become extremely heavy. Everything - every grain of sand on Earth, every planet in the solar system and every galaxy - will become millions of billions times heavier than it is now, and this will have disastrous consequences: The new weight will squeeze all material into a small, super hot and super heavy ball, and the universe as we know it will cease to exist. This violent process is called a phase transition. The phase transition in the universe will happen if a bubble is created where the Higgs-field associated with the Higgs-particle reaches a different value than the rest of the universe. If this new value results in lower energy and if the bubble is large enough, the bubble will expand at the speed of light in all directions. All elementary particles inside the bubble will reach a mass, that is much heavier than if they were outside the bubble, and thus they will be pulled together and form supermassive centers.

Christmas Files

Christmas Music Files