Navigation Links
Dark energy -- 10 years on
Date:11/30/2007

Three quarters of our universe is made up of some weird, gravitationally repulsive substance that was only discovered ten years ago dark energy. This month in Physics World, Eric Linder and Saul Perlmutter, both at the University of California at Berkeley, reveal how little we know about dark energy and describe what advances in our knowledge of dark energy we can expect in the coming decade from a series of planned space missions.

Perlmutter was the leader of one of the two separate teams of astrophysicists who concluded, from watching distant supernovae, that the cosmic expansion was accelerating and not slowing under the influence of gravity, as was previously thought. The two teams' finding confirmed just how little we know about our universe.

The two teams' discovery has led to the creation of the "concordance model" of the universe, which states that 75 per cent of our universe is made up of dark energy, 21 per cent of dark matter, another substance we know little about, with only a remaining four per cent being made up of matter that we do understand. The most conventional explanation is that dark energy is some kind of "cosmological constant" that arises from empty space not being empty, but having an energy as elementary particles pop in and out of existence.

Since the first evidence for the accelerating universe was made public in early 1998, astrophysicists have provided further evidence to shore up the findings and advances in the measurement methods bode well for increasing our understanding in the future.

Galaxies and the cosmic background hold some significant clues. Equipment that can make a more robust comparison between galaxy patterns across the sky and investigate temperature fluctuations in the cosmic microwave background, helping trace the pattern of galaxy formation, is being made available. Methods for further observation of supernovae are expanding and improving too.

Eric Linder and Saul Perlmutter write, The field of dark energy is very young and we may have a long and exciting period of exploration ahead before it matures.

The December issue also includes reporting from Robert P Crease, historian at the Brookhaven National Laboratory, US, on the difficulty of deciding who should gain credit for the discovery of the accelerating universe and comment from Lawrence M Krauss, director of the Center for Education and Research in Cosmology and Astrophysics at Case Western Reserve University, US, on the possibility that we may never be able to tell if dark energy is a cosmological constant or something more exotic still.

Also in this issue:

  • 50 years on: why physicists still love the computer-programming language Fortran
  • Christmas books: a round-up of all the best new physics titles for the holiday period


'/>"/>

Contact: Joseph Winters
joseph.winters@iop.org
44-020-747-04815
Institute of Physics
Source:Eurekalert

Related biology technology :

1. Verenium Corporation to Present at the Upcoming Cowen and Company Clean Energy Conference
2. China Technology Announces Entry to the Solar Energy Sector
3. BioStorage Technologies Becomes Green Powered through the Use of 100% Certified Renewable Energy
4. NanoLogix Inc. Announces Historical First in Energy Generation With Bioreactor-Produced Hydrogen at Welchs
5. Nanotech could make solar energy as easy and cheap as growing grass
6. International Atomic Energy Agency and National Foundation for Cancer Research Launch Major Initiative to Improve Cancer Prevention and Treatments in Developing Countries
7. Nanowire generates power by harvesting energy from the environment
8. Biomaxx Systems Inc. Renews Membership With Bioenergy Australia
9. BioEnergy International Facility Opens in Bay State
10. Bioenergy Life Science and Integrative Therapeutics, Inc. Form Exclusive Co-Marketing Alliance
11. BioFuel Energy Announces Earnings Release and Shareholder Conference Call
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/11/2016)... Feb. 11, 2016  Vermillion, Inc. (NASDAQ: VRML ... today announced the formation of the Steering Committee for ... --> Pelvic masses can present physicians ... management. Once pregnancy is ruled out, pelvic masses may ... advanced endometriosis, benign ovarian tumors and gastrointestinal and urinary ...
(Date:2/11/2016)... 2016  Wellcentive today announced it has been ... -based community care organization (CCO) with more ... quality reporting and care management solutions and services. ... of quality managers, analysts and care managers while ... serving FamilyCare members. Oregon ...
(Date:2/11/2016)... 2016   BioInformant announces the February 2016 ... Products, Opportunities, Tools, and Technologies – Market Size, Segments, ... The first and only ... industry, BioInformant has more than a decade of historical ... by stem cell type. This powerful 175 page global ...
(Date:2/10/2016)... Febr. 10, 2016 /PRNewswire/ - BioAmber Inc. (NYSE: BIOA ... announce that Mitsui & Co. Ltd., its partner in ... plant, is investing an additional CDN$25 million in the ... stake from 30% to 40%.  Mitsui will also play ... produced in Sarnia , providing dedicated ...
Breaking Biology Technology:
(Date:1/22/2016)... Jan. 22, 2016 ... of the "Global Biometrics Market in ... offering. --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ... "Global Biometrics Market in Retail Sector 2016-2020" ... --> Research and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ...
(Date:1/20/2016)...   MedNet Solutions , an innovative SaaS-based eClinical ... research, is pleased to announce the attainment of record-setting ... result of the company,s laser focus on (and growing ... it,s comprehensive, easy-to-use and highly affordable cloud-based technology platform. ... MedNet growth achievements in 2015 include: , ...
(Date:1/15/2016)... 15, 2016 Recent publicized breaches in cyber ... new ways to ensure data security and user authentication ... and Android that ties a user,s mobile ... into a hardware authorization token. Customer service agents who ... on their KodeKey enabled device to verify their identity. ...
Breaking Biology News(10 mins):