Cosmology@Home lets you volunteer your spare computer time (like when your screen saver is on) to help search for the model which best describes our Universe and to find the range of models that agree with available cosmological and particle physics data.

conceptFEATURED CONCEPT: Dark Matter
Unlike ordinary matter, dark matter does not emit or absorb light--or any other type of electromagnetic radiation. Consequently, dark matter cannot be observed directly using a telescope or any other astronomical instrument that has been developed by humans. If dark matter has these strange properties, how do we know that it exists in the first place?
Like ordinary matter, dark matter interacts gravitationally with ordinary matter and radiation. Astronomers study the distribution of dark matter through observing its gravitational effects on ordinary matter in its vicinity and through its gravitational lensing effects on background radiation. The background image shows the bullet cluster, a famous example where the visible matter does not follow the mass distribution.
Combining all the available evidence, dark matter represents about 83% of the matter content of the universe. Read more about dark matter on this web page. Let us know your questions and comments on the message board.

User of the Day

User profile Profile Glenn Rogers
My name is Glenn I have a 5 year old son who cant wait to get his hands on my laptop. I am currently living in the North West of Western Australia,...


Planck contest results
The BOINC Pentathlon is complete, as is our own Planck contest! You can see the results of the Planck contest here and of the Pentathlon here. Congratulations to users Mumps[MM], UofS-Computer-Science, and Bryan, and to team SETI.USA (who also won the Pentathlon)! You guys will be added to the list of thank-yous in our paper.

In the end it was a quite exciting race for the 3rd place user spot, Bryan managed to overtake KaptainBlaZzed with only 45 minutes left in the contest last night! Well done to both of you and many thanks to all of the thousands of users and hundreds of teams that contributed. This was far and away the most computing power I've seen at C@H since I've been managing it, and the workunits you computed will greatly help us improve our work. Stay tuned for a future post about these results.
19 May 2017, 9:26:22 UTC · Comment

New camb_boinc2docker workunits temporarily disabled
Hi all, in an effort to keep the server functioning smoothly (its operating pretty close to capacity with all the extra traffic from the Pentathlon) I've disabled creation of new camb_boinc2docker jobs until the contest is over on May 19th. All your in-progress camb_boinc2docker work will finish and be validated, this only means no *new* work for this application will be sent out by the server. If you wish to continue crunching Virtualbox applications (like camb_boinc2docker was), there should be enough planck_param_sims jobs, just make sure you haven't explicitly disabled this application in your preferences. Good luck and happy crunching! 10 May 2017, 17:08:40 UTC · Comment

Planck contest standings
The in-progress standings of the Planck contest can now be seen here! (note: those standings include only Planck jobs, the Pentathlon counts any Cosmology@Home job).

Additionally, validation had been lagging a bit, but that is now fixed. It should take about 48 hours for all the jobs that had piled up waiting on validation to finish and for credit to be granted. There is also a shortage of work for the camb_boinc2docker and planck_param_sims applications, which I'm currently working on now and I expect to be fixed by tonight. Apologies for this!
7 May 2017, 14:35:04 UTC · Comment

C@H a BOINC Pentathlon project!
And in addition to the new Planck jobs, C@H is the "Marathon" project for the yearly BOINC Pentathlon contest! You can find out more about the Pentathlon here.

To slightly sweeten the deal, we'd like to add a few more thank-yous to the paper, so we will again take the top 3 users and top team (excluding the winners from last time) and add your names to the paper. Although you're welcome to start crunching Planck jobs now, the contest will be only considering Planck jobs returned during the Pentathlon which runs from May 5th to May 19th (see above link for a countdown). We'll post an updated page to keep track of the leaders this week. Good luck everyone!
30 Apr 2017, 13:09:58 UTC · Comment

Planck satellite analysis part 2
Hi folks. Last year, you guys helped analyze results from the Planck satellite by having your computers comb through millions of simulations of our universe, to help us understand if some curiosities in the Planck data were just statistical flukes, or if they were hints of a new discovery. In a bit more detail, the science behind these jobs was described here, and your results allowed us to write a paper which explored these questions (which we'll summarize in a future post). Along the way we also had a contest for who contributed the most computing power to these jobs, and we ultimately thanked winners MaDdCoW, 25000ghz[Lombardia], Rally1965 and team BOINC.Italy in the paper.

For those that aren't familiar with the way publication works, first a paper is submitted, then a referee replies with comments and requests for revisions, then the authors respond and the paper is eventually accepted or rejected. This is the stage we're currently in now, working on this response. As part of the response, it would be useful to analyze some more simulations, so starting today and continuing at least for a few weeks, we'll be adding back a bunch more Planck jobs.

Thanks again to all who contribute and happy crunching!
29 Apr 2017, 22:15:46 UTC · Comment

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