- #1
David Berger
What particles(s) can pass through hundreds of miles of the Earth? Is it only neutrinos, or is there some other particle(s)?
Yes of course, but it is rare. So rare that they needed such an extremely powerful neutrino source and 15 months of measurement time. They found 134±22 events, or about two per week.David Berger said:There must be some kind of interaction if they are bouncing neutrinos off of a nucleus.
See above for gravitons.David Berger said:Here's a question... Do nuclear power plants produce gravitons or dark energy particles?
In addition to what mfb said, note that dark energy and dark matter are two very different things. It is therefore important not to confuse them with each other.David Berger said:Do nuclear power plants produce gravitons or dark energy particles?
@mfb did qualify his reply in #2 with "... if they exist" but it's an overstatement to say that they probably don't exist. We just don't know yet.Peter Svancarek said:There is most probably no graviton particle existing.
Although this metaphor of "fabric" and depressions and ripples is common in non-technical descriptions of general relativity, it is still just a metaphor and should not be taken too seriously.Gravity field is a depression in spacetime fabric... and gravitational wave is a ripple in spacetime fabric.
I don’t have a proper statistical analysis, but from my impression most physicists expect them to exist. Quantum field theory is extremely successful, and while we have some issues with the calculations, it is expected that gravity can be formulated as QFT as well.Peter Svancarek said:There is most probably no graviton particle existing. Gravity field is a depression in spacetime fabric... and gravitational wave is a ripple in spacetime fabric.
To add to what has already been said by Nugatory and mfb: What makes you think that GR would invalidate the existence of the graviton in any way? That is like saying that Maxwell's equations would invalidate the existence of the photon. On the contrary, quantum gravity is essentially required to have GR as a classical limit.Peter Svancarek said:There is most probably no graviton particle existing. Gravity field is a depression in spacetime fabric... and gravitational wave is a ripple in spacetime fabric.
The most common particles that pass through Earth are neutrinos, cosmic rays, and muons.
Neutrinos are tiny, electrically neutral particles that have very little mass. They are created by nuclear reactions in the Sun and other stars, as well as by cosmic ray interactions.
Cosmic rays are high-energy particles, mostly protons and atomic nuclei, that originate from outside of our solar system. They are constantly bombarding Earth from all directions.
Muons are subatomic particles that are similar to electrons, but with a much greater mass. They are created when cosmic rays collide with atoms in our atmosphere.
These particles are able to pass through Earth because they have very high energy and are not affected by the Earth's magnetic field. They also have a very small cross-section, meaning they are able to travel through matter without interacting with it much.