Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > To the heart of darkness: a laboratory study of dark energy

Anna Dejardin
Anna Dejardin

Abstract:
It seems extraordinary that a device on the nanoscale, smaller than a human hair, could hold clues to the fundamental driving force shaping the entire universe.

But a series of experiments at the London Centre for Nanotechnology (LCN), led by Dr Paul Warburton and Dr Jon Fenton, centred around a new generation of devices only nanometres in size, are working towards producing data with enormous consequences.

To the heart of darkness: a laboratory study of dark energy

London, UK | Posted on May 10th, 2009

This strange coupling of the massive with the minuscule is a consequence of speculation that the vacuum of space is not quite as empty as we would believe. Instead it is bristling with zero-point fluctuations, a phenomenon predicted by quantum mechanics, the area of physics modified to account for the unusual behaviour of matter on the small scale. The Heisenberg uncertainty principle, well known for the assertion that it is impossible to know both a particle's position and momentum at the same instant,. It also demands that even the vacuum of space must possess some form of residual energy. Due to the assertion of equality between energy and mass, this vacuum energy is believed to take the form of ‘virtual particles' continually popping in and out of existence.


Suggestions that this vacuum energy is in fact the enigmatic substance referred to perplexingly as 'dark energy' have caused quite a stir. Dark energy, one of the unsolved mysteries of modern cosmology, is believed to make up over 75% of the universe and be responsible for the acceleration of the universe's expansion. It is proving difficult to define; there have been many theories put forward to describe dark energy - quintessence, phantom fields, chaotic scalar fields to name a few - all rather unfamiliar concepts and all as of yet unsubstantiated. As an explanation zero-point energy is appealing in its reassigning new meaning to a concept that has already been around for decades and is well grounded in other theory.


While the physical basis behind this theory of dark energy is phrased in a language we understand, the experimental difficulties Drs Warburton and Fenton encounter in the course of their work are substantial. They use devices that may hold some answers, devices based on Josephson junctions. The Josephson junctions themselves are tiny electronic devices consisting of strips of superconducting material, in which a current experiences no resistance, and separated by a thin insulating gap. In such a setup it is another consequence of the Heisenberg uncertainty principle that there is a probability for the electron to be present in the insulating layer and, under the right circumstances, it can effectively ‘tunnel' across the insulating gap, resulting in the flow of a current.

As in any electronic set-up the effects of background noise must be taken into account, but whereas in most experiments noise is a nuisance to be minimised as far as possible, in these investigations one component in the spectrum of noise is the area of real interest.
At low temperatures, when the thermal excitations in the superconducting material are somewhat suppressed, the current due to noise is dominated by zero-point fluctuations. The potential for proof, or at least compelling evidence, as to whether vacuum energy is in fact dark energy lies in a limit placed on the vacuum energy by astronomical observations of the amount of dark energy in the universe. The finite value of dark energy density dictates that the team should see no zero-point fluctuation current generated above a critical frequency of around 1.7 THz.

The biggest challenge now is to develop experimental equipment capable of measuring the background noise up to such high frequencies. By exploring the properties of high-temperature superconductors the team at the London Centre for Nanotechnology, in collaboration with scientists at the University of Cambridge, hope to take measurements across the critical THz frequency range.
The implications of verifying the upper limit and connecting vacuum energy with dark energy would be huge, throwing light onto the formation of the current universe and fuelling predictions for its future. But in the atmosphere of uncertainty and even controversy surrounding the theory any answers either way to the question of whether we can measure dark energy in a laboratory will be a welcome step in moving towards long searched for answers.


Anna Dejardin

####

About London Centre for Nanotechnology
The London Centre for Nanotechnology, is a UK-based, multidisciplinary research centre forming the bridge between the physical and biomedical sciences. It was conceived from the outset with a management structure allowing for a clear focus on scientific excellence, exploitation and commercialisation. It brings together two world leaders in nanotechnology, namely University College London and Imperial College London, in a unique operating model that accesses the combined skills of multiple departments, including medicine, chemistry, physics, electrical and electronic engineering, biochemical engineering, materials and earth sciences, and two leading technology transfer offices.

For more information, please click here

Contacts:
Dr Thierry Bontoux
London Centre for Nanotechnology
+44 (0)20 7679 0056

Copyright © London Centre for Nanotechnology

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

UMBC researchers develop nanoparticles to reduce internal bleeding caused by blast trauma July 13th, 2018

Leti and Oscaro Partner on Leti’s New Low-Power, Low-Cost Transceiver to Track Parcels July 12th, 2018

Oxford Instruments’ 22 Tesla superconducting magnet system commissioned at the UAM, making it the most intense magnetic field available outside a large international facility July 12th, 2018

Physics

A refined magnetic sense: Algorithms and hardware developed in the context of quantum computation are shown to be useful for quantum-enhanced sensing of magnetic fields July 2nd, 2018

Evidence for a new property of quantum matter revealed: Electrical dipole activity detected in a quantum material unlike any other tested June 11th, 2018

Theory gives free rein to superconductivity at room temperature May 28th, 2018

Scientists Pinpoint Energy Flowing Through Vibrations in Superconducting Crystals: Interactions between electrons and the atomic structure of high-temperature superconductors impacted by elusive and powerful vibrations May 4th, 2018

Discoveries

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

UMBC researchers develop nanoparticles to reduce internal bleeding caused by blast trauma July 13th, 2018

Barium ruthenate: A high-yield, easy-to-handle perovskite catalyst for the oxidation of sulfides July 13th, 2018

Researchers identify cost-cutting option in treating nail fungus with nanotechnology: GW researcher Adam Friedman, M.D., studied the potential use of nitric oxide-releasing nanoparticles to improve onychomycosis treatment July 11th, 2018

Announcements

Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication July 13th, 2018

UMBC researchers develop nanoparticles to reduce internal bleeding caused by blast trauma July 13th, 2018

Barium ruthenate: A high-yield, easy-to-handle perovskite catalyst for the oxidation of sulfides July 13th, 2018

Leti and Oscaro Partner on Leti’s New Low-Power, Low-Cost Transceiver to Track Parcels July 12th, 2018

Tools

Oxford Instruments’ 22 Tesla superconducting magnet system commissioned at the UAM, making it the most intense magnetic field available outside a large international facility July 12th, 2018

Nanometrics to Announce Second Quarter Financial Results on July 31, 2018 July 12th, 2018

Nanometrics to Participate in the 10th Annual CEO Investor Summit 2018: Accredited investor and publishing research analyst event held concurrently with SEMICON West and Intersolar 2018 in San Francisco June 28th, 2018

The Institute of Applied Physics at the University of Tsukuba near Tokyo in Japan uses Deben's ARM2 detector to better understand catalytic reaction mechanisms June 27th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project