LHC@home

may I suggest...

This sign...



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lmao, the x explains it all. :))

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Ya mean something like this?

<img></img>

http://www.srl.caltech.edu/lisa/graphics/01.blackhole.binary.jpg if the image doesn't work.

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I had something not so nice in mind, more of a middle finger stretched out toward us from a spaghetti'izing body, with distorted look of agony and bewilderment on face.

lol

Ofcourse, that is if they accidentally found how-to, and made, a black hole.

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What would we do? Mostly, I think the answer is run likehell. I've done all the cern safety courses and they sure didn't cover that type of emergency

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Team FatBat - supporting overweight vampires since 1973.

Cern is hoping to create black holes in the LHC. They want to study the decay and creation of very small blackholes. That black holes decay was suggested by Stephen Hawking, see http://en.wikipedia.org/wiki/Hawking_radiation . The reason black holes are interesting is that ordinarily the LHC is not energetic enough to create black holes, but if Gravitation exist in more than the ordinary dimensions it is possible to create them. This means that the LHC may be able to experimentally verify that there are more than 4 dimensions.

The black holes will be so small (~ 1 TeV ) that they will only live for a very short time. Remember also that black holes are based on the weakest of all forces the gravitational force. When was the last time you felt yourself gravitationally attracted to a speck of dust? And that speck is millions and millions of times as heavy as the black holes generated in the LHC.

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Chrulle
Research Assistant &amp; Ex-LHC@home developer
Niels Bohr Institute

As I don't think we fully understand black holes yet, the closest we can get to making one is to stick to neutrons side by side, via a collision. Yes?

Or is CERN going by another set of parameters?

edit/addit:
Oh wait, that won't do it, we already have that.
it is the parts of the neutron that have to be squished into a smaller space.

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Ok from what I know about black holes (which is about nothing), I would say that the tiny black holes would still attract matter and then slowly grow up, no ?

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Interestingly enough, no.

Thanks to quantum mechanical effects black holes are not completely black. They constantly send out radiation making them loose a certain amount of energy. A black hole with a given mass has an effective temperature radiating this way. The smaller the mass the higher the temperature.

A star mass black hole will have a temperture so low that it actually get more energy from the current background radiation in the universie that it will gain more mass from that radition than it loses from what itself emits.

A black hole the size of an elementary particle however has so high temperature that it loses more than it can absorb, and the more it looses the smaller it gets, and so gets even warmer and looses energy even faster. That way a small black hole will evaporate itself away completely in an extremely short time. It will either leave just a swarm of particles behind, or possibly something new as well. For example Gary Horowits has found that if string theory is correct an electrically charged black hole might leave behind something called a Kaluza-Klein "bubble of nothing" Which in some sense is a missing piece of space time.

We are quite certain about this general picture but the details depends on things which we still do no know, like the number of dimension of the universe and their sizes. LHC will be able to gives us some answers to those questions, both by producing black holes and by not doing so.

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Ok now i'm commenting on latest post :)

I'm understanding that there is no such thing as an unfed black-hole.
so once a black-hole, always a black-hole?

Is the critical mass for becoming a black hole known?
Is the critical mass for exiting a black hole state known?
- or must a black hole evaporate?

I guess that's what the tests are for.
Good Luck!!!

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Omg... black holes can be eletrically charged ?

Bubbles of nothingness ??

Missing space time pieces ???

What has this world come to !

:O

I'll defenitely have to read more on that

Thanks

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<blockquote>Ok from what I know about black holes (which is about nothing), I would say that the tiny black holes would still attract matter and then slowly grow up, no ?</blockquote>


Ok.. here's the thing, if you do create a black hole which is in the drawer of your desk, it would weigh as much as the last snack it ate.. ie.. suppose it ate your coffee mug.

The forces holding your desk together are much stronger than the gravitational forces which attract your desk to a coffee mug.

If the black hole really is stable, it'd leave a tiny hole in whatever it passes, so there would be an atom sized hole in the earth, as the black hole's momentum makes it go in a straight line and passes through anything it touches, eating a few atoms along the way as it passes through things.

So, if you do create a black hole, make sure it has enough escape velocity to leave earth orbit quickly.

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I'm not the LHC Alex. Just a number cruncher like everyone else here.

So Alex, this could actually be a black hole gun ?

All the cool kids will want one !

^_^

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<blockquote>So Alex, this could actually be a black hole gun ?

All the cool kids will want one !

^_^</blockquote>

You'll shoot your eye out with that thing!

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I'm not the LHC Alex. Just a number cruncher like everyone else here.

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Reply for Meckano

A black hole which is far from any matter, eg not insid a galaxy or just in an empty part of galaxy is more or less unfed. but the microwave background radiation will still feed it energy no matter where it is. However the microwave background is getting less end less energetic as the uinverse gets older. So after a _long_ time it will be cold enoiugh that any black hole will radiatte more energy than it gets from the microwave background no matter where it is. So in the long run any black hole will evaporate.

A small black hole wil radiate so much energy that it will loose mass faster than you can send it into the hole, no matter which environment it is in.

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>>What will CERN do if they create a black hole?


Perhaps they could use it to dig a tunnel for an even bigger collider?

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Gaspode the UnDressed
http://www.littlevale.co.uk

Thanks klasm

<blockquote><blockquote>Ok from what I know about black holes (which is about nothing), I would say that the tiny black holes would still attract matter and then slowly grow up, no ?</blockquote>


Ok.. here's the thing, if you do create a black hole which is in the drawer of your desk, it would weigh as much as the last snack it ate.. ie.. suppose it ate your coffee mug.

The forces holding your desk together are much stronger than the gravitational forces which attract your desk to a coffee mug.

If the black hole really is stable, it'd leave a tiny hole in whatever it passes, so there would be an atom sized hole in the earth, as the black hole's momentum makes it go in a straight line and passes through anything it touches, eating a few atoms along the way as it passes through things.

So, if you do create a black hole, make sure it has enough escape velocity to leave earth orbit quickly.

</blockquote>

Isn't a blackhole created by enough mass to collapse the fabric of space-time?
Isn't it the gravity of that mass in such a small space that makes it black?
How can you have a black hole with little mass? A coffe cup doesn't have enough mass to collapse space, how can you have a singularity with that little mass and with such a small gravity well? Don't use math in your answer.

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David Stites
Mount Vernon, WA USA