Physicists have 'solved' mystery of levitation
2007 08 10
By Roger Highfield | telegraph.co.uk
In theory the discovery could be used to levitate a person
Levitation has been elevated from being pure science fiction to science fact, according to a study reported today by physicists.
In earlier work the same team of theoretical physicists showed that invisibility cloaks are feasible.
Now, in another report that sounds like it comes out of the pages of a Harry Potter book, the University of St Andrews team has created an 'incredible levitation effects’ by engineering the force of nature which normally causes objects to stick together.
Professor Ulf Leonhardt and Dr Thomas Philbin, from the University of St Andrews in Scotland, have worked out a way of reversing this pheneomenon, known as the Casimir force, so that it repels instead of attracts.
Their discovery could ultimately lead to frictionless micro-machines with moving parts that levitate But they say that, in principle at least, the same effect could be used to levitate bigger objects too, even a person.
The Casimir force is a consequence of quantum mechanics, the theory that describes the world of atoms and subatomic particles that is not only the most successful theory of physics but also the most baffling.
The force is due to neither electrical charge or gravity, for example, but the fluctuations in all-pervasive energy fields in the intervening empty space between the objects and is one reason atoms stick together, also explaining a “dry glue” effect that enables a gecko to walk across a ceiling.
Now, using a special lens of a kind that has already been built, Prof Ulf Leonhardt and Dr Thomas Philbin report in the New Journal of Physics they can engineer the Casimir force to repel, rather than attact.
Because the Casimir force causes problems for nanotechnologists, who are trying to build electrical circuits and tiny mechanical devices on silicon chips, among other things, the team believes the feat could initially be used to stop tiny objects from sticking to each other.
Prof Leonhardt explained, “The Casimir force is the ultimate cause of friction in the nano-world, in particular in some microelectromechanical systems.
Such systems already play an important role - for example tiny mechanical devices which triggers a car airbag to inflate or those which power tiny 'lab on chip’ devices used for drugs testing or chemical analysis.
Micro or nano machines could run smoother and with less or no friction at all if one can manipulate the force.” Though it is possible to levitate objects as big as humans, scientists are a long way off developing the technology for such feats, said Dr Philbin.
The practicalities of designing the lens to do this are daunting but not impossible and levitation “could happen over quite a distance”.
Prof Leonhardt leads one of four teams - three of them in Britain - to have put forward a theory in a peer-reviewed journal to achieve invisibility by making light waves flow around an object - just as a river flows undisturbed around a smooth rock.
Article from: Physicists have 'solved' mystery of levitation
John Hutchison - The Hutchison-Effect
Invisibility cloaks are in sight
Demonstration and the mathematics of invisibility cloaking (Video)
Now you see it, now you don't: cloaking device is not just sci-fi
The Hutchison Effect - American Antigravity
Latest News from our Front Page
Election Posters in New Sweden
2014 08 27
Swedish prime minister Fredrik Reinfeldt has promised continued mass immigration at the expense of welfare reform and tax cuts. Reinfeldt’s Moderates party consequently does everything in their power to recruit immigrants’ votes. Placards for the forthcoming elections, widely distributed in immigrant-dominated enclaves in Sweden, has Arabic text, the language that now increasingly is dominating major parts of "New Sweden."
In the ...
2014 08 27
Gender Madness - RT
RT: "Tanya, a mathematician from Sweden, is writing a blog about gender madness. She wants to find its origins. She discusses the topic with different people, meets some gender specialists and even considers conducting some experiments."
Yes, this is a very erratic and "different" short film, but Kajsa Bergkvist, the girl making the film has a ...
Could Greece’s mystery tomb lie intact? Well-preserved headless sphinxes
2014 08 27
Well-preserved headless sphinxes hint that grave dating back to Alexander the Great
Archaeologists are hopeful that an ancient mound in northern Greece could hold the untouched remains of an important senior official from the time of Alexander the Great.
Excavations at the ‘incredibly important’ tomb have revealed a pair of sphinxes guarding the grave’s entrance.
The two sculptures were found under an arch ...
Horrifying accidents at infectious disease labs hidden from the public, ‘cloaked in secrecy’
2014 08 26
Literally hundreds of incidents involving viruses, bacteria and toxins that pose major bioterror risks to both people and agriculture have been reported to federal regulators from 2008 through 2012, according to government reports obtained and reviewed by USA Today.
More than half of the over 1,100 incidents were serious enough that laboratory workers had to have medical evaluations and/or treatment, the ...
Those Who Know They’re Dreaming Are Savvier When Awake
2014 08 26
It’s probably fair to assume that at this moment, you are, in fact, awake. You’re reading; you’re scrolling; sometime in the not-too-distant past, you somehow made your way to The Atlantic’s website. All waking activities.
But let’s say, hypothetically, that as you’re reading this, the floor and everything else beneath you dissolve, leaving your body floating where your chair had been ...
|More News » |