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Google LHC search results September 10, 2008

Posted by dorigo in internet, personal.
Tags: ,

Despite the fact that this blog received several “heavy” links from high-traffic sites (NYT, NEW, Cosmic Variance, plus a dozen lighter ones) between yesterday and today, a good portion of the thousands of readers who crowded this site landed here somewhat misguided by google, which is not too smart in its searches, and it reports some relatively older posts of mine at the very top of its list for the following:

plus a few more combinations, including CMS control room. I apologize to internauts who arrived here (or rather, to the outdated posts linked by google) and found nothing of what they were searching for – the fault is with Google, not with me!



1. nige cook - September 10, 2008

Google is smarter than you make it out to be. Your posts about the analysis of data from particle physics experiments are extremely informative and explain technical points very helpfully.

2. Google LHC search results - September 11, 2008

[…] post by dorigo Google LHC search […]

3. Quasar9 - September 11, 2008

But surely we can still expect you to keep us up to date,
or even give us advance warning of expected events/results.

will evaporating microstates (mini blackholes?) appear and disappear, and/or will they appear and disappear too fast for the LHC to even detect..

will new particles make a guest appearance …
and/or is it possible that we may even see man made particles?
ok ok even if man made, they must exist in nature – somewhere.

4. dorigo - September 11, 2008

Black holes could in principle leave very distinct signatures. One would be the decrease of jet production – since above a certain energy, the production of BH would dampen the cross section of generic QCD qq-qq processes. Another would be a very spherical emission of energy. The thing has been studied in detail. I can give more references if you really want them.

New particles: sure, we do that every day. These exist in the sense that they can be created, although you might have a hard time finding them in the Universe. We are anyway talking about unstable matter, which decays quickly.


5. LuboŇ° Motl - September 12, 2008

To see the black hole signatures, look at the CERN webcam at least for 30 seconds.


6. nige cook - September 12, 2008

That’s a nice black hole! The very existence of the big bang universe disproves the LHC black hole fears:

1. The universe started with all the matter in a very small, confined space (zero space according to general relativity which postulates a singularity with infinite energy density at zero time; or, according to some quantum field ideas, there might be a minimum size scale of something like the Planck length at zero time).

2. Such a great amount of mass in a small space effectively constitutes a black hole (i.e., R < 2GM/c^2), albeit an expanding one.

3. The universe was able to expand rapidly and cool, and allow life to evolve, despite effectively constituting a black hole. The mass of the universe (10^21 stars, plus dark matter and energy) is something like 10^51 kg, so the black hole event horizon radius of the universe is on the order 2GM/c^2 = 10^24 m, which was the size of the universe when 100 million years old. The universe was effectively a black hole (according to mainstream definitions today) for the first 100 million years of the big bang, until it expanded beyond its black hole event horizon radius.

4. Hence, far from causing the destruction of the universe, the big bang black hole actually created the universe!

So it was a very good thing, not the cataclysmic disaster suggested by the propaganda from the LHC black hole haters!

7. surya narayan singh - September 12, 2008

my thoughts on lhc

8. Caroline - September 15, 2008

I just want to say thank you for posting this on the internet. I read about your site in “physics world” magasine, and have really enjoyed reading what i’ve read so far, so thank you.

9. dorigo - September 16, 2008

Dear Caroline,

thank you for visiting. This site contains about 1300 posts, and by the laws of chance, it is bound to contain at least a few good post. Up to you to find them!


10. John Bowes - October 3, 2008

T, I greatly appreciate your thoughts & understanding of the LHC & being able to explain it simply & clearly to a lay person (me!)

Question: It is my understanding that we can not know both the speed & location of a particle! How is that so when in the LHC you fire particles at each other – Consequently you know their speed & their location at point of collision?

Best wishes John B from Melbourne Australia

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