LHC@home

mhh, that are a lot of very small workunits. most of them between 10 and 500sec cpu time...

azwoody said: It's not about getting the credit, but it's more of a "tidy things up" request..

Right now, I got about 4+ pages of the 0.00xx pending WU's, and another page or so of "moldy ones" (credit granted, but they don't go away!)

Just think of the 1000's or even 100's of thousands of "weird and old" records in the database.

Part of any science is to keep your lab clean and organized. I liek the science, but seems the DB is a bit of a mess.....

FalconFly said: Indeed, work done is work done, but seeing LHC not tidying up the few remaining Problems... it just looks like the transition to the new maintainers is somehow still incomplete after all this time.

I like projects 'clean' with all the small advantages that come with that.

83k is the saturation only as long as they stay with the 10 per day limit.

Remove the limit and let the power users add a few thousands to the saturation point...

If the project really does want tasks returned and validated as fast as possible, it's time to increase or remove the daily limit of 10/thread.

Over 74000 WUs in progress..
WUs ready to crunch: 8300 and rising...

I tried to add an avatar to my message board preference, and when I hit "update info" it came up with

Fatal error: Call to undefined function gd_info() in /srv/httpd/lhcathome.cern.ch/lhcathome/html/inc/image.inc on line 7

This is still happening, I still can't upload an Avatar and I am getting the same error message.

It is not a problem any more. We are holding the jobs because we hope to get more very soon so you'll have even more to crunch.

Some speculation here and a link to his one and only post over at SETI.

“If the test does not find what the theory predicts about W boson scattering,” said UCSD physics professor Benjamin Grinstein, “it would be evidence that one of string theory's key mathematical assumptions is violated.”

But on the other hand ... it would help if the findings match the theory.

...stating one of the basic equations of special relativity, which is, again

E^2 - p^2c^2 = m^2c^4

where m denotes the invariant or rest mass. A photon has no rest mass, so the equation reduces to

E = pc

where p is the momentum of the photon. Even though the photon has no rest mass, that doesn't make it an exception to general relativity. In fact, because the photon has no invariant mass, it will travel along a perfect geodesic since it does not distort spacetime.

To answer your other question, yes, there is a mass-momentum relationship in special relativity, but it only applies to particles that actually have mass (read: invariant or rest mass).

It is:

p = mv/Sqrt[1-v^2/c^2]

I am unsure if you are familiar with the concept of a Taylor series, but it is a common technique used in physics to approximate an equation about some value by an infinite series. The idea is to find a polynomial whose derivatives all match a given function at a point of interest. The upshot is that the more terms you add, the better the approximation is, and for small perturbations, the approximation is extremely accurate. In this case, we can take the above expression and expand it into this series:

p = mv + mv^3/(2c^2) + 3mv^5/(8c^4) + O(v^6)

where the O term denotes whatever higher order terms I have left out in this expansion (the higher the order, typically the less important the term). The interesting point is that we see the first term (typically the most important) is mv, which is the classical expression for momentum, so we know then that the special relativity relation for momentum-rest mass reduces to what we classically expect in the small velocity regime v << c.

I think I might have poured gasoline on a smoldering fire. Here's blowing a little sunshine up everyone's ass... I love you guys!

Gee, I like you too, Ariel, but I'm not convinced it's working for you. What do you mean by ass wipe and why am I the biggest? I've been D&A free for a long time, never went to AA though.