# B Can we produce black holes by particle accelerators?

#### Xforce

Summary
Thanks to CERN, we now have huge particle accelerators such as the LHC. We use them to enhance our understanding of quantum physics.
Summary: Thanks to CERN, we now have huge particle accelerators such as the LHC. We use them to enhance our understanding of quantum physics.

As everyone know,particle accelerators are huge machines that smashes atoms into pieces at near the speed of light. I have heard making antimatter by using them, which is an inefficient but the only known method. And I have heard the WIMP particles or Higgs-Boson particles that helps us study dark matter.
They are truly amazing stuff. But what about black holes? I heard that we can produce an artificial quantum-sized black hole by a particle accelerator. Of course it must be larger than LHC and the experiment will engage in space. The idea is, to accelerate a proton to such high energy that it’s wavelength shrinks to under The Planck’s length, which is 1.26*10^-35 meters(from Wikipedia). Another way is using the principal of special relativity, when the proton ‘s velocity makes its mass increases, and the Schwarzschild radius(which is 2Gm/c^2)becomes greater than the proton’s diameter(8.751^10^-16 meters). So is it feasible to make a black hole by particle accelerators?

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#### PeterDonis

Mentor
The idea is, to accelerate a proton to such high energy that it’s wavelength shrinks to under The Planck’s length
Another way is using the principal of special relativity, when the proton ‘s velocity makes its mass increases, and the Schwarzschild radius(which is 2Gm/c^2)becomes greater than the proton’s diameter(8.751^10^-16 meters)
These descriptions are not correct. Velocity is relative; just having a reference frame in which a proton is moving at a highly relativistic velocity cannot make it into a black hole.

Particle accelerators create high energy collisions by smashing beams of particles together that are traveling in opposite directions. Just making the particles move very fast does nothing by itself.

is it feasible to make a black hole by particle accelerators?
No. You would have to build an accelerator about the size of the observable universe for it to be able to smash together beams of particles with enough energy to do this.

#### PAllen

@PeterDonis , what you say is true for standard model and GR. However, for some hypothetical gravity theories, LHC could produce BH, and LHC looked for this, but none were found:

"Can we produce black holes by particle accelerators?"

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