Hall effect at the speed of light: How can you demonstrate relativistic effects with your mobile phone?

May 21, 2012 By Adarsh Sandhu, RIKEN
The rolling-shutter effect is a visual distortion and vertical shift of the centroid of a rotating propeller caused by the time delay from the horizontally-moving shutter of the camera.

The relativistic Hall effect describing objects rotating at speeds comparable with the speed of light has been reported.

The work by Konstantin Bliokh and Franco Nori at RIKEN in Japan, NAS in Ukraine, and the University of Michigan in the US sheds light on aspects of , and you can demonstrate some aspects of this with your .

As any cameraman knows, recording a fast rotating object such as a fan using a “rolling shutter” camera, like those found on mobile phones, results in weird distortions. See for example:

Less widely understood — until now — is the link between these distortions and some of the landmark theories in physics, namely Einstein’s relativity and the Hall effect.

Hall effects describe the interplay of rotation and linear motion in objects. There are already a number of manifestations of the Hall effect, including classical, quantum, and ‘spin-based’.

Relativity describes effects that arise when an object approaches the . This study considered the as arising naturally under special relativity conditions without any external fields. The researchers found that a relativistic treatment of rotating bodies and quantum wave systems with angular momentum results in deformations and a shift in the geometric centre. The distortions have parallels with those found when recording a rotating object with a rolling shutter camera.

“Our description makes relativistic and quantum aspects of angular momentum fully consistent with each other,” conclude Bliokh and Nori.

This relativistic approach may find applications over a wide range of length scales including elementary spinning particles, classical and, even rotating black holes.

Explore further: Emerging from the vortex

More information: Konstantin Y. Bliokh and Franco Nori, Relativistic Hall Effect: Phys. Rev. Lett. 108, 120403 (2012).
DOI: 10.1103/PhysRevLett.108.120403

Related Stories

Emerging from the vortex

February 17, 2012

Whether a car or a ball, the forces acting on a body moving in a straight line are very different to those acting on one moving in tight curves. This maxim also holds true at microscopic scales. As such, a beam of electrons ...

Doubly special relativity

March 21, 2011

General relativity, Einstein’s theory of gravity, gives us a useful basis for mathematically modeling the large scale universe – while quantum theory gives us a useful basis for modeling sub-atomic particle physics ...

Recommended for you

CMS gets first result using largest-ever LHC data sample

February 15, 2019

Just under three months after the final proton–proton collisions from the Large Hadron Collider (LHC)'s second run (Run 2), the CMS collaboration has submitted its first paper based on the full LHC dataset collected in ...

Gravitational waves will settle cosmic conundrum

February 14, 2019

Measurements of gravitational waves from approximately 50 binary neutron stars over the next decade will definitively resolve an intense debate about how quickly our universe is expanding, according to findings from an international ...


Adjust slider to filter visible comments by rank

Display comments: newest first

1.4 / 5 (10) May 21, 2012
A characteristically misleading title. The effect desribed is not relativistic in nature, and the "demonstrations" listed are described in the article, for those who go so far as to read it, as analogous examples under what "science" considers essentially non relativistic conditions! There are no references in the article of such overtly relativistic effects being recorded with mobile phones! In fact, most "relativistic effects", from Doppler shifts to the bending of light by gravity to black holes to even time dilation, were all predicted even under "classical mechanics"! They claim these are all occurring in different forms in Einsteinian relativity, but it was always "verified" by "scientists" working behind closed doors in "laboratories". For all its proved overt demonstration, Einsteinian relativity does not exist.
4.2 / 5 (10) May 21, 2012
For all its proved overt demonstration, Einsteinian relativity does not exist.

you sure are aware that Einstein relativity is used in calculation of position by GPS ? ;D
and that if they didnt include it, GPS precision would drift by /- 10 Km each day ? ;D

5 / 5 (6) May 21, 2012
Julian: Are you saying that all of the thousands of experiments and existing products are based on "magic" instead of relativity? Please adjust your tin-foil hat.
2.3 / 5 (3) May 21, 2012
By the way, we know that all relativistic effects in relativity arisen from mathematical formulas, maybe it is nice to understand its physical mechanism behind, here:

1 / 5 (7) May 21, 2012
Anorion displays the same gullibility that gives the lies of "science" so much power.
They say they use Einsteinian relativistic equartions in calculating GPS positions!
There is no proof provided that they use relativistic equations!
Just their saying something is true doesn't automatically make it true!
In the same way, thermodynamics cannot provide any actual, provable case of an experiment actually demonstrating Einsteinian relativity. Just because numbers flash on screens or blips move across screens in certain ways is not proof. In attacking the photographs of fairies in Cottingley, "debunkers" denounce people at the time of being so entracned by the infallibility of the camera that it couldn't tell a lie. This is the same attitude the gullible devotees of "science" have of the machines operated behind "laboratory" doors.
1 / 5 (1) May 22, 2012
Try this.

arXiv:1205.3307 [pdf]

Spatio-temporal vortex beams and angular momentum

Konstantin Y Bliokh, Franco Nori
not rated yet May 22, 2012
Earth to Julian (tapping lightly on his head)...Earth to Julian? Too late, he's gone.
1 / 5 (1) May 22, 2012
you sure are aware that Einstein relativity is used in calculation of position by GPS ? ;D
and that if they didnt include it, GPS precision would drift by /- 10 Km each day ? ;D

No it wouldn't, unless the designers are idiots.

All you need is reference beacons on the ground, preferably 4 non-coplanar reference points, with LOS to any one satellite and you can always get a perfectly accurate reference for the satellite's position. Do this for all satellites and then use them to ping the GPS devices. No relativity required at all.

With 4 points on the surface of a sphere, you can determine the exact direction and distance to a satellite using only classical physics. You don't even need doppler shift or anything like that, because there is only one possible correct configuration.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.