Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

‘Listen, two black holes are clashing!’

26.11.2004


MiniGRAIL: first spherical gravitational wave antenna in the world

Since last week, Professor Giorgio Frossati of Leiden University’s Institute of Physics can ‘listen’ to gravitational waves. That is, if such a wave happens to come along. Gravitational waves originate from violent clashes between black holes in the universe and from instabilities in neutron stars.

MiniGRAIL is the name of the first spherical gravitational wave antenna in the world. The ball was made at the Leiden Institute of Physics (LION) of Leiden University. It is the product of years of close cooperation between Frossati’s research group and the technicians of the fine-mechanic and electronic workshop in the Institute. “A result to be proud of”, says Professor Peter Kes, LION’s scientific director.



The MiniGRAIL detector is made of copper with a pinch of aluminium (6%), has a diameter of 65 cm and weighs 1150 kilos. If a gravitational wave passes by the antenna, it will transmit a very small part of its energy to the ball. Gravity waves with a frequency of circa 3000 hertz will make the ball vibrate in all kinds of different ways.

Yet, these vibrations are very small, a billionth of a billionth part of a centimetre (10 -20 m), which makes them very difficult to measure. MiniGRAIL will have to attain a sensitivity good enough to detect these ultra-small vibrations. Astronomers predict that at the frequency and amplitude of such ultra-small vibrations various sources of gravitational waves can be measured, like clashes of black holes and instabilities in neutron stars.

In order to preclude false vibrations as much as possible, MiniGrail is built on vibration-free poles, and the ball is cooled down to ultra-low temperatures. At this moment the ball is 4 Kelvin, which is -269 degrees Celsius. This is as cold as it can get in the coldest corners of the universe. In a number of weeks the ball’s temperature will be decreased even more, to reach record depth, and then the scientific race will break loose: who in the world will be the first to measure gravitational waves?

The race will be between American teams, an Italian team and Frossati’s own team. Still, cooperation will be more important than competition. “You can never be sure you have measured a gravitational wave until you have compared notes with the other teams. Only if all of us, simultaneously, have a hit will we know that it was indeed a gravitational wave.”

Eppo Bruins | alfa
Further information:
http://www.nieuws.leidenuniv.nl/index.php3?m=&c=373
http://www.leidenuniv.nl

More articles from Physics and Astronomy:

nachricht New thruster design increases efficiency for future spaceflight
16.08.2017 | American Institute of Physics

nachricht Tracking a solar eruption through the solar system
16.08.2017 | American Geophysical Union

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: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

Im Focus: Scientists improve forecast of increasing hazard on Ecuadorian volcano

Researchers from the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, the Italian Space Agency (ASI), and the Instituto Geofisico--Escuela Politecnica Nacional (IGEPN) of Ecuador, showed an increasing volcanic danger on Cotopaxi in Ecuador using a powerful technique known as Interferometric Synthetic Aperture Radar (InSAR).

The Andes region in which Cotopaxi volcano is located is known to contain some of the world's most serious volcanic hazard. A mid- to large-size eruption has...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

New thruster design increases efficiency for future spaceflight

16.08.2017 | Physics and Astronomy

Transporting spin: A graphene and boron nitride heterostructure creates large spin signals

16.08.2017 | Materials Sciences

A new method for the 3-D printing of living tissues

16.08.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>