Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

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

21.05.2012
Saitama, Japan, 20 May 2012 - The relativistic Hall effect describing objects rotating at speeds comparable with the speed of light has now been reported.
PRESS RELEASE
Source: Franco Nori, RIKEN, Japan.
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 fundamental physics, and you can demonstrate some aspects of this with your mobile phone.

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, http://www.youtube.com/watch?v=17PSgsRlO9Q, http://www.youtube.com/watch?v=LVwmtwZLG88&feature=fvwrel.

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.


(a) A relativistic rotating flywheel in the rest frame. (b) Deformations of the wheel shape in the frame moving with a velocity comparable to the speed of light.

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 speed of light. This study considered the Hall effect 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 light and, even rotating black holes.

Reference

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

Restricted link: http://prl.aps.org/abstract/PRL/v108/i12/e120403

Further information

Franco Nori, Team Leader
Digital Materials Team
RIKEN Advanced Science Institute
2-1 Hirosawa, Wako-Shi,
Saitama, 351-0198, Japan
Tel :+81-48-467-9681 secretary
Tel: +81-48-467-9707 direct
e-mail: fnori@riken.jp
Group website: http://www.riken.go.jp/engn/r-world/research/lab/frontier/quantum/digital/index.html
Associated links
Youtube video 1
http://www.youtube.com/watch?v=17PSgsRlO9Q
Youtube video 2
http://www.youtube.com/watch?v=LVwmtwZLG88&feature=fvwrel
Digital Materials Team website
http://www.riken.go.jp/engn/r-world/research/lab/frontier/quantum/digital/index.html
Link to paper in Physical Review Letters
http://prl.aps.org/abstract/PRL/v108/i12/e120403
Journal information
Physical Review Letters DOI: 10.1103/PhysRevLett.108.120403

Adarsh Sandhu | Research asia research news
Further information:
http://www.rikenresearch.riken.jp
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht Tangled magnetic fields power cosmic particle accelerators
14.12.2018 | DOE/SLAC National Accelerator Laboratory

nachricht In search of missing worlds, Hubble finds a fast evaporating exoplanet
14.12.2018 | NASA/Goddard Space Flight Center

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Data use draining your battery? Tiny device to speed up memory while also saving power

The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.

Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...

Im Focus: An energy-efficient way to stay warm: Sew high-tech heating patches to your clothes

Personal patches could reduce energy waste in buildings, Rutgers-led study says

What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...

Im Focus: Lethal combination: Drug cocktail turns off the juice to cancer cells

A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.

The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...

Im Focus: New Foldable Drone Flies through Narrow Holes in Rescue Missions

A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...

Im Focus: Topological material switched off and on for the first time

Key advance for future topological transistors

Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

New Plastics Economy Investor Forum - Meeting Point for Innovations

10.12.2018 | Event News

EGU 2019 meeting: Media registration now open

06.12.2018 | Event News

 
Latest News

Data use draining your battery? Tiny device to speed up memory while also saving power

14.12.2018 | Power and Electrical Engineering

Tangled magnetic fields power cosmic particle accelerators

14.12.2018 | Physics and Astronomy

In search of missing worlds, Hubble finds a fast evaporating exoplanet

14.12.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>