Published News Physics

What are the limits of human vision?

Take a look around the room – what do you see? All those colours, the walls, the windows – everything seems so self-evident, just so there. It's weird to think that how we perceive this rich milieu boils down to light particles – called photons – bouncing off these objects and onto our eyeballs.
This photonic barrage gets soaked up by approximately 126 million light-sensitive cells. The varying directions and energies of the photons are translated by our brain into different shapes, colours, brightness, all fashioning our technicolour world.

Scientists discover fundamental property of light - ScienceAlert

Light plays a vital role in our everyday lives and technologies based on light are all around us. So we might expect that our understanding of light is pretty settled. But scientists have just uncovered a new fundamental property of light that gives new insight into the 150-year-old classical theory of electromagnetism and which could lead to applications manipulating light at the nanoscale.

Hidden in Einstein’s Math: Faster-than-Light Travel? | Special Relativity

Although Einstein's theories suggest nothing can move faster than the speed of light, two scientists have extended his equations to show what would happen if faster-than-light travel were possible.
Despite an apparent prohibition on such travel by Einstein’s theory of special relativity, the scientists said the theory actually lends itself easily to a description of velocities that exceed the speed of light.
"We started thinking about it, and we think this is a very natural extension of Einstein's equations," said applied mathematician James Hill, who co-authored the new...

Why do measurements of the gravitational constant vary so much?

Newton's gravitational constant, G, has been measured about a dozen times over the last 40 years, but the results have varied by much more than would be expected due to random and systematic errors. Now scientists have found that the measured G values oscillate over time like a sine wave with a period of 5.9 years. It's not G itself that is varying by this much, they propose, but more likely something else is affecting the measurements.

Why Snow is White

Most often, the question “why is the snow white” is asked by children, yet not all adults know the answer as well. Why it’s white and not red, green or whatever? Moreover, there’s one more question concerning snow. Why is the ice transparent while the snow is white? The answer to both of these questions is connected with two things: the very notion of color and the structure of snow and ice. We’ll start with the first problem. Let’s explain it from physics perspective.

WATCH LASER LIGHT MOVING AT 100 BILLION FRAMES A SECOND

There's a new, ultra-fast camera that lets engineers take videos of phenomena including the movement of laser light and even faster-than-light phenomena. Watching the videos is like seeing a physics textbook come to life.

Finding faster-than-light particles by weighing them

In a new paper accepted by the journal Astroparticle Physics, Robert Ehrlich, a recently retired physicist from George Mason University, claims that the neutrino is very likely a tachyon or faster-than-light particle. There have been many such claims, the last being in 2011 when the "OPERA" experiment measured the speed of neutrinos and claimed they travelled a tiny amount faster than light. However, when their speed was measured again the original result was found to be in error – the result of a loose cable no less.

Is warp drive physically possible? | ScienceDump

The physics of spacetime described by Einstein's Theory of General Relativity allows spacetime to become warped due to the relationship between matter/energy density and the gravitational field described by the Einstein Field Equations, in the most general form Ruv - (guvR)/2 + guv = (8pG/c4)Tuv, which equates that matter and energy found in the large scale structure of the universe creates a positive torsion in spacetime, causing the warping of spacetime which is associated with the strength of the gravitational force.

Halting photons could lead to miniature particle accelerators, improved data transmission

Researchers at MIT who succeeded last year in creating a material that could trap light and stop it in its tracks have now developed a more fundamental understanding of the process. The new work—which could help explain some basic physical mechanisms—reveals that this behavior is connected to a wide range of other seemingly unrelated phenomena.

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