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Time Travel Theory Avoids Grandfather Paradox

Posted on Jul 26, 2010 in - Physics & the Universe

Source: PhysOrg

The possibility of going back in time only to kill your ancestors and prevent your own birth has posed a serious problem for potential time travelers, not even considering the technical details of building a time machine. But a new theory proposed by physicists at MIT suggests that this grandfather paradox could be avoided by using quantum teleportation and “post-selecting” what a time traveler could and could not do. So while murdering one’s relatives is unfortunately possible in the present time, such actions would be strictly forbidden if you were to try them during a trip to the past.

The model of proposed by Seth Lloyd, et al., in a recent paper at arXiv.org arises from their investigation of the quantum mechanics of closed timelike curves (CTCs) and search for a . In simple terms, a CTC is a path of spacetime that returns to its starting point. The existence of CTCs is allowed by Einstein’s , although it was Gödel who first discovered them. As with other implications of his theories, Einstein was a bit disturbed by CTCs....

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Physicist Creates Most Magnetic Material on Earth, Might Overturn Laws of Physics

Posted on Apr 05, 2010 in - Physics & the Universe

Source: PopSci

 

A more powerful magnetic material may have emerged to topple previous record-holder iron cobalt, until now the most magnetic material on Earth. The new iron and nitrogen compound might also force physicists to revise their understanding of magnetism, according to the Minnesota Daily.

The iron and nitrogen compound proved 18 percent more magnetic than iron cobalt in tests done by Jianping Wang, a physicist at the University of Minnesota. There also appears to be a “new physics” at work in the substance, but physicists at other labs must replicate the experiment and verify the work.

Wang reportedly found localized electrons in his iron and nitrogen compound, which have never shown up before in magnetic materials. Localized electrons are electron-pair bonds shared by nonmetals, as opposed to the free-flowing electrons typically related to magnetism and electric current.

Some physicists suspect that localized electrons, rather than free-flowing electrons, are more responsible for magnetism in materials. The discovery also appears to overturn traditional theories that set limits on the strength of magnetism in substances.

Japanese researchers at the Central Research Laboratory of Hitachi also created a magnetic iron and nitrogen compound in 1996, but no other scientists were able to get the same results....

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Large Haldron Collider Smashes Protons at Highest Energies Ever Recorded – 99% the Speed of Light

Posted on Mar 30, 2010 in - Physics & the Universe

Source: PopSci

It took 16 years and $10 billion dollars, but on the day the Large Hadron Collider was supposed to begin trying to cross its high energy proton beams it didn’t take very long at all for researchers to create the highest-energy particle collisions ever witnessed in an experimental setting. At just after 1 p.m. local time beneath the French-Swiss border, CERN scientists smashed two proton beams moving at 99 percent of the speed of light together at total energies of 7 trillion electron volts.

The result was a soundless proton explosion that heralded a new period of scientific discovery as physicists from around the world try to recreate and study the conditions immediately after the Big Bang, understand the nature of dark energy and dark matter and determine whether the hypothetical Higgs boson really does exist.

The LHC will collide the beams at 3.5 TeV each for the next 18 months before shutting down for a year for repairs, after which it will begin colliding protons at twice that energy.

The Webcast – and celebration – is ongoing at the LHC....

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Understanding Solar Storms, Flares and Their Effects on Civilization Thumbnail

Understanding Solar Storms, Flares and Their Effects on Civilization

Posted on Mar 01, 2010 in - Physics & the Universe

Source: NPR

Every few decades, the sun experiences a particularly large storm that can release as much energy as 1 billion hydrogen bombs. Officials from Europe and the U.S. say an event like that could leave millions on Earth without electricity, running water and phone service.

A massive solar storm could leave millions of people around the world without electricity, running water, or phone service, government officials say.

That was their conclusion after participating in a tabletop exercise that looked at what might happen today if the Earth were struck by a solar storm as intense as the huge storms that occurred in 1921 and 1859.

Solar storms happen when an eruption or explosion on the surface of the sun sends radiation or electrically charged particles toward Earth. Minor storms are common and can light up the Earth’s Northern skies and interfere with radio signals.

Every few decades, though, the sun experiences a particularly large storm. These can release as much energy as 1 billion hydrogen bombs.

How Well Can We Weather The Solar Storm?

The exercise, held in Boulder, Colorado, was intended to investigate “what we think could be close to a worst-case scenario,” says Tom Bogdan, who directs the Space Weather Prediction Center in Boulder....

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Single Photons Observed at Seemingly Faster Than Light Speeds Thumbnail

Single Photons Observed at Seemingly Faster Than Light Speeds

Posted on Jan 26, 2010 in - Physics & the Universe

Source: Physorg

Hayden’s Note:

[If you’re a fan of ‘What the Bleep Do We Know?!’ or simply interested in quantum physics, you’ll appreciate this post.  For the rest of you, feel free to move on to the next post.] 

Researchers at the Joint Quantum Institute (JQI), a collaboration of the National Institute of Standards and Technology and the University of Maryland at College Park, can speed up photons (particles of light) to seemingly faster-than-light speeds through a stack of materials by adding a single, strategically placed layer. This experimental demonstration confirms intriguing quantum-physics predictions that light’s transit time through complex multilayered materials need not depend on thickness, as it does for simple materials such as glass, but rather on the order in which the layers are stacked. This is the first published study of this dependence with single photons.

Strictly speaking, light always achieves its maximum speed in a vacuum, or empty space, and slows down appreciably when it travels through a material substance, such as glass or water. The same is true for light traveling through a stack of dielectric materials, which are electrically insulating and can be used to create highly reflective structures that are often used as optical coatings on mirrors or ....

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Are We Approaching Free Energy Machines? Thumbnail

Are We Approaching Free Energy Machines?

Posted on Dec 28, 2009 in - Geeks, Gadgets, & Gizmos, - Physics & the Universe

Source: http://jnaudin.free.fr/steorn/indexen.htm and Cryptogon News

A reversal of the polarity of the coils does not change the direction of rotation…

When the rotor is manually braked, the supply current in the toroidal coils remains constant…

There is no counter electromotive force (Back EMF) induced in the stator coils when the rotor is turned manually.

Read the entire article here… very interesting!

Potentially Self Running Machine - Are we getting close to Free Energy?

...

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Superconductor Magnet Spacecraft Heat Shield Being Developed Thumbnail

Superconductor Magnet Spacecraft Heat Shield Being Developed

Posted on Nov 26, 2009 in - NASA / Space Exploration, - Physics & the Universe

article_shuttle_heat_shield(PhysOrg.com) — European space agencies and an aerospace giant are developing a new re-entry heat shield that will use superconductor magnets to generate a magnetic field strong enough to deflect the superhot plasma formed during re-entry of returning spacecraft. They plan to test the new technology by attaching a test module to a missile and using a Russian submarine to fire it into space.

As spacecraft re-enter the Earth’s atmosphere at high speeds super-hot temperatures are produced through friction. Traditional heat shields use temperature-resistant ablative coatings that burn off on re-entry, or tough insulating materials, such as the tiles used on the space shuttle. If the new magnetic shielding is successful it could be more reliable and make the craft lighter and easier to re-use, since it would reduce or eliminate the need for other shielding materials.

The project is being run cooperatively by the European Space Agency, EADS Astrium, and the German aerospace center, DLR (Deutschen Zentrums for Luft- und Raumfahrt). The idea is to use a superconducting coil at front of the craft to generate a strong magnetic field projecting beyond the front of the craft....

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Scientists create ‘artificial ionosphere’ using radio waves

Posted on Oct 21, 2009 in - Physics & the Universe

Source: Time of India 4 October 2009, 03:51pm IST LONDON: An experiment that fires powerful radio waves into the sky has created a patch of 'artificial ionosphere', mimicking the uppermost portion of Earth's atmosphere. According to a report in Nature News, the experiment is called the 'High Frequency Active Auroral Research Program' (HAARP), near Gakona, Alaska. It has spent nearly two decades using radio waves to probe Earth's magnetic field and ionosphere. One of the most obvious results of the experiments is that they can create lights in the sky that are similar to auroras, the glowing curtains of light that naturally appear in the polar skies when electrons and other charged particles pour down from Earth's protective magnetosphere into the upper atmosphere. There, at

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Artificial Black Hole Created in Chinese Lab Thumbnail

Artificial Black Hole Created in Chinese Lab

Posted on Oct 21, 2009 in - Physics & the Universe

Source:  Nature News By Stuart Fox Posted 10.15.2009 at 3:56 pm Pocket Black Hole The icons depict the shape of the energy-trapping ridges on the disc at the center and the edges via arXiv.org Just because most black holes are solar-system-sized maelstroms with reality-warping gravitational pulls doesn't mean you can't have one in your pocket! That's right, just in time for the holidays comes the pocket black hole. Designed by scientists at the Southeast University in Nanjing, China, this eight-and-a-half-inch-wide disk absorbs all the electromagnetic radiation you throw at it, with none of the pesky time dilation and Hawking radiation associated with the larger, interstellar versions. Unlike a regular black hole, which traps light using the gravitational pull of the de

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