On Dec 5, 2011, at 4:04 AM, Alain dit le Cycliste wrote:
About the risk of big black hole,
the CERN have accepted to start the LHC, not only because current
theory say that small black hole will evaporate quickly (they don't
take risk based on, even consensual, theory),
but because Auger observatory have shown that we receive daily huge
cosmic particle that are many billions times more heavy (above
exaelectronvolt, up to10^20eV),
and that the planet have survived since a few trillions years back.
I think you mean millions, not trillions of years back.
The difference between external cosmic rays and the LHC is that the
velocity of the center of mass of the colliding objects in the LHC is
near zero. Black holes with anywhere near the momentum of cosmic
rays could go right through the earth and never be trapped by its
gravitational field.
http://www.auger.org/cosmic_rays/faq.html#energy
about magnetic fields, the one at LHC are big, but there are many
place on earth, where such field are created, or just a little
weaker, including in MNR machines.
Cosmic rays approach NMR machines at huge velocities, very near the
speed of light. The center of mass of colliding particles in the LHC
is zero, so the black holes from the LHC should have orders of
magnitude less kinetic energy and momentum than cosmic rays.
There is also some stars having huge magnetic fields that have been
detected. they could tell us about the existence or nonexistence of
some feared/expected effects.
I heard nothing about exceptional unexpected effect observed.
True, but again, the velocity of the center of mass of the colliding
materials is moving in the case of magnetars etc. Also, magnetars
present orders of magnitude less cross section due to their extremely
small diameters (about 20 km), and by the protection their 1000 T
magnetic fields provide against direct impact via cosmic ray deflection.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
