Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog

Category: physics

Publication numbers are in: 55 thousand downloads! đŸŽ‰đŸ˜đŸŸ.

Singularity Hypotheses: A Scientific and Philosophical Assessment offers authoritative, jargon-free essays and critical commentaries on accelerating technological progress and the notion of technological singularity. It focuses on conjectures about the intelligence explosion, transhumanism, and whole brain emulation. Recent years have seen a plethora of forecasts about the profound, disruptive impact that is likely to result from further progress in these areas. Many commentators however doubt the scientific rigor of these forecasts, rejecting them as speculative and unfounded. We therefore invited prominent computer scientists, physicists, philosophers, biologists, economists and other thinkers to assess the singularity hypotheses. Their contributions go beyond speculation, providing deep insights into the main issues and a balanced picture of the debate.

Read more

Physicists at the University of Warwick have today, Thursday 19th April 2018, published new research in the fournal Science today 19th April 2018 (via the Journal’s First Release pages) that could literally squeeze more power out of solar cells by physically deforming each of the crystals in the semiconductors used by photovoltaic cells.

The paper entitled the “Flexo-Photovoltaic Effect” was written by Professor Marin Alexe, Ming-Min Yang, and Dong Jik Kim who are all based in the University of Warwick’s Department of Physics.

The Warwick researchers looked at the physical constraints on the current design of most commercial solar cells which place an absolute limit on their efficiency. Most commercial solar cells are formed of two layers creating at their boundary a junction between two kinds of semiconductors, p-type with positive charge carriers (holes which can be filled by electrons) and n-type with negative charge carriers (electrons).

Read more

Wormholes, or hypothetical tunnels through space-time that allow faster-than-light travel, could potentially leave dark, telltale imprints in the sky that might be seen with telescopes, a new study suggests.

These slightly bent, oblong wormhole “shadows” could be distinguished from the more circular patches left by black holes and, if detected, could show that the cosmic shortcuts first proposed by Albert Einstein more than a century ago are, in fact, real, one researcher says.

Wormholes are cosmic shortcuts, tunnels burrowing through hyperspace. Hop in one end, and you could emerge on the other side of the universe — a convenient method of hyperfast travel that’s become a trope of science fiction. [8 Ways You Can See Einstein’s Theory of Relativity in Real Life].

Read more

COLUMBUS, Ohio — A gravitational wave detector that’s 2.5 miles long isn’t cool. You know what’s cool? A 25-mile-long gravitational wave detector.

That’s the upshot of a series of talks given here Saturday (April 14) at the April meeting of the American Physical Society. The next generation of gravitational wave detectors will peer right up to the outer edge of the observable universe, looking for ripples in the very fabric of space-time, which Einstein predicted would occur when massive objects like black holes collide. But there are still some significant challenges standing in the way of their construction, presenters told the audience.

“The current detectors you might think are very sensitive,” Matthew Evans, a physicist at MIT, told the audience. “And that’s true, but they’re also the least sensitive detectors with which you can [possibly] detect gravitational waves.” [8 Ways You Can See Einstein’s Theory of Relativity in Real Life].

Read more

Seven Brief Lessons on Physics sold over a million copies around the world. Now Rovelli is back to explore the mysteries of time. He tells about student revolution and how his quantum leap began with an acid trip.

‱ Extract from Carlo Rovelli’s new book: on the elastic concept of time.

Read more

What makes something red, or blue, or green? It’s all in the way light bounces off its surface. Something that primarily reflects light with shorter wavelengths will appear bluer, while something that reflects longer wavelengths will appear redder. By playing around with that principle, scientists have created a material that, much like soap bubbles and certain insect wings, displays a gorgeous iridescence—a shifting rainbow of colors they can tweak with the same surface.

Even more interestingly, the researchers made this material from common cellulose, the simple stuff that makes up paper and which can be extracted from wood, cotton, or other renewable sources. We’ve already mentioned scientists arranging cellulose fibers in a way that makes them appear incredibly white. But now instead of laying fibers, a team of physicists are molding cellulose films with tiny, regularly spaced impressions (like an upside-down Lego piece).

The outcome was a thin, single-centimeter iridescent film that reflects light based on the spacing of the dots, according to the paper published recently in Nature Photonics.

Read more