This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy.
Skip to the content

Free weekly newswire

Sign up to receive all our latest news direct to your inbox.

Physics on film

100 Second Science Your scientific questions answered simply by specialists in less than 100 seconds.

Watch now

Bright Recruits

At all stages of your career – whether you're an undergraduate, graduate, researcher or industry professional – brightrecruits.com can help find the job for you.

Find your perfect job

Physics connect

Are you looking for a supplier? Physics Connect lists thousands of scientific companies, businesses, non-profit organizations, institutions and experts worldwide.

Start your search today

Tag archives: cosmology

Are ‘sterile neutrinos’ dark-matter particles after all?

Graph showing recent constrains on sterile neutrino production

Could sterile neutrinos constitute dark matter? (Courtesy: Bubul et al./ arXiv:1402.2301)

 

By Tushna Commissariat

It is always interesting to us at Physics World when a particular topic suddenly attracts the attentions of the physics community, especially when it’s a rather hotly debated subject. The past couple of days, for example, have seen a lot of talk about “sterile neutrinos”, based on two papers – published in quick succession on the arXiv preprint server – that suggest the tentative detection of these hypothetical paricles.

Both papers are based on an unidentified emission line seen in the X-ray spectrum of some galaxy clusters obtained by the European Space Agency’s XMM-Newton observatory. Intriguingly, sterile neutrinos are also considered to be possible dark-matter candidates, meaning that – if discovered – they would be the first fundamental particles to lie beyond the bounds of the Standard Model of particle physics.

(more…)

Posted in General | Tagged , , , , , | 8 Comments | Permalink
View all posts by this author  | View this author's profile

Condensed-matter cosmology and spin wires

Waterloo, here I come (Courtesy: IQC)

Waterloo, here I come. (Courtesy: IQC)

By Hamish Johnston at the 2013 CAP Congress in Montreal

Yesterday morning I was back at the University of Montreal for more physics at the Canadian Association of Physicists Congress. I started off the morning with a bit of quantum cosmology and quantum gravity with a distinct hint of condensed-matter physics.

(more…)

Posted in CAP Congress 2013 | Tagged , | Leave a comment | Permalink
View all posts by this author  | View this author's profile

Old-school cosmological calculations

By Tushna Commissariat

Image of a calculator

Doing away with complex calculations? (CC-BY-2.0/Boaz Arad)

The next time you need to quickly convert the redshift of some distant cosmic object to parsecs or kilometres, and find that your laptop and phone have both run out of charge (the horror!), the “Paper-and-pencil cosmological calculator” might be just the thing for you. More of a chart than a “calculator”, the new table – that is based on the ΛCDM cosmological model of the universe – has been drawn up by Sergey Pilipenko from the Lebedev Physical Institute in Moscow. And here’s the best bit – all the parameters that Pilipenko has plugged into his table are from the latest Planck results unveiled last month.

(more…)

Posted in General | Tagged , , , , | Leave a comment | Permalink
View all posts by this author  | View this author's profile

Listen to the sound of the Big Bang

By James Dacey

Hearing the Big Bang
Planck data used to represent the sounds of the early universe
This text will be replaced

It sounds like a Kraftwerk track, but this is in fact an audio representation of the Big Bang based on scientific measurements. The physicist John Kramer has produced the sounds using the new data from the ESA’s Planck Mission analysis of the cosmic microwave background (CMB) radiation.

(more…)

Posted in General | Tagged , | Leave a comment | Permalink
View all posts by this author  | View this author's profile

String theorist bags $3m Fundamental Physics Prize

By Hamish Johnston

Alexander Polyakov

Alexander Polyakov has something to smile about. (Courtesy: Technion University)

The string theorist Alexander Polyakov has won the 2013 Fundamental Physics Prize. The $3m prize is awarded by Milner Foundation, which is funded by the Russian entrepreneur Yuri Milner and was inaugurated last year.

(more…)

Posted in General | Tagged , , , | 2 Comments | Permalink
View all posts by this author  | View this author's profile
WordPress Appliance - Powered by TurnKey Linux