Physicists Have Solved “Mystery” of Levitation

Levitation has been elevated from being pure science fiction to science
fact, according to a study reported today by physicists.

  Beijing saleswoman demonstrates toy which levitates by magnetic force; Physicists have 'solved' mystery of levitation
In theory the discovery could be used to levitate a person

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.

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