Back to physics - in style!
Thanks for that helpful blog post Philg!
Search found 76 matches
- Sun Jun 27, 2010 11:32 pm
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613838
- Wed Jun 23, 2010 4:32 pm
- Forum: Off topic
- Topic: Can any of you give me some idea's on books?
- Replies: 13
- Views: 26029
Re: Can any of you give me some idea's on books?
Field medalist Tim Gowers' "Very Short Introduction to Mathematics" is good (if very short ;-) ). Actually, some of the other books in the "Very Short Introduction" series might be worth a look as well. http://www.amazon.co.uk/Mathematics-Very-Short-Introduction-Introductions/dp/0192853619 Not a tex...
- Wed Jun 09, 2010 3:17 pm
- Forum: The Accelerator
- Topic: Physics At LHC 2010 - conference
- Replies: 4
- Views: 7950
Re: Physics At LHC 2010 - conference
Thanks for posting this!
- Sat May 22, 2010 1:02 am
- Forum: The Accelerator
- Topic: Current Events Discussion
- Replies: 512
- Views: 613838
Re: Current Events Discussion
LHC Operations Status Report - a nice summary of the state of play
http://indico.cern.ch/conferenceDisplay.py?confId=95508
(Apologies if this has been posted already)
http://indico.cern.ch/conferenceDisplay.py?confId=95508
(Apologies if this has been posted already)
- Tue May 18, 2010 3:13 pm
- Forum: Science
- Topic: Where does the energy go?
- Replies: 13
- Views: 20888
Re: Where does the energy go?
PhilG, thanks for your long reply! Really sorry I have not responded yet - I hope to have the time to do so properly soon.
- Tue May 18, 2010 3:10 pm
- Forum: Science
- Topic: Luminance, luminosity, squeezing explained in English
- Replies: 14
- Views: 26941
Re: Luminance, luminosity, squeezing explained in English
I am not sure why you included the length of the tunnel and the length of a bunch in your calculation? Also, the number of protons enters the luminosity quadratically (they must hit each other, not a brick wall!). There is also a geometric factor due to the beams crossing at an angle, rather than he...
- Wed May 05, 2010 9:35 am
- Forum: Science
- Topic: Where does the energy go?
- Replies: 13
- Views: 20888
Re: Where does the energy go?
@PhilG: I hesitate to say this because you are not quoting anyone or anything specific - but I think you are rather quick to call "nonsense" when referring to statements taken completely out of context. Quite often what happens is that a particular mathematical fact is expressed in words, and that c...
- Tue May 04, 2010 9:20 pm
- Forum: Science
- Topic: Where does the energy go?
- Replies: 13
- Views: 20888
Re: Where does the energy go?
Photons have an energy proportional to their frequency. By E=mc^2, this means they have a mass (though no rest mass - so they cannot be at rest). Therefore, they source a gravitational field and bend spacetime, just like any other mass. However, this does not explain the apparent violation of energy...
- Mon Apr 26, 2010 6:19 pm
- Forum: Science
- Topic: Luminance, luminosity, squeezing explained in English
- Replies: 14
- Views: 26941
Re: Luminance, luminosity, squeezing explained in English
why they don't collect a given number of events... Ultimately this is of course just a convention, but I think it is because one is usually interested in the number of collision events *of a particular type* (e.g., Beauty production). A calculation on the theory side will traditionally produce the ...
- Sat Apr 17, 2010 1:21 pm
- Forum: The Accelerator
- Topic: Conference
- Replies: 5
- Views: 9304
Re: Conference
That's great news - Congratulations!
- Tue Mar 23, 2010 7:39 pm
- Forum: The Accelerator
- Topic: Proton vs Graphite
- Replies: 44
- Views: 48150
Re: Proton vs Graphite
Excellent
Yes! No energy is ever lost... it all has to go somewhere...So, what energy is released into the block in total ? the 3.5TeV?
- Tue Mar 23, 2010 9:47 am
- Forum: The Accelerator
- Topic: Proton vs Graphite
- Replies: 44
- Views: 48150
Re: Proton vs Graphite
I think I see your misunderstanding. Of course if you send a 3.5 TeV proton into a beam dump, that energy will not disappear - it will end up in the beam dump, making the beam dump hotter. It will end up there like the previous 2 posts describe - a cascade of collisions and scatterings, a bit like a...
- Mon Mar 22, 2010 8:18 pm
- Forum: The Accelerator
- Topic: Proton vs Graphite
- Replies: 44
- Views: 48150
Re: Proton vs Graphite
The details of the beam dump are not really important for Xymox' question, because for the comparison with head-on collisions only the first collision of each proton matters. The reason his intuition is failing him is because the beam is moving so close to the speed of light, so relativistic effects...
- Wed Feb 24, 2010 11:15 am
- Forum: Science
- Topic: How can a black hole have electric charge?
- Replies: 11
- Views: 27102
- Tue Feb 23, 2010 1:20 pm
- Forum: Science
- Topic: Infinite series in quantum phyics
- Replies: 29
- Views: 37740
Re: Infinite series in quantum phyics
@chriwi While it's fun to speculate, and I'm not sure I understand your idea, ultimately we'll find out when some quantum gravity theory is experimentally proven... BUT Lorentz invariance (which is experimentally very well established) does rule out a lot of things. @ansgar: I see what you're gettin...