Skip to main content

New answers tagged

4 votes

Would normal atoms and antimatter atoms be attracted to each other?

Antimatter isn't attracted to normal matter by any extra special forces (as far as we currently know), it still obeys the four fundamental forces. The attraction would be the same as if they were both ...
Paolo Mancini's user avatar
9 votes
Accepted

Would normal atoms and antimatter atoms be attracted to each other?

As far as we know, antimatter is affected by the same four fundamental forces as matter - the strong, weak, electromagnetic and gravitational forces. There is no mysterious fifth force that attracts ...
gandalf61's user avatar
  • 53.8k
3 votes

Supressing proton and neutron decay?

Neutron decay is blocked because the possible decay products (protons and electrons) are already present as degenerate gases and will not admit the creation of more of them at energies below their ...
ProfRob's user avatar
  • 131k
0 votes

Particles Associated With Gravitational Waves

Everything in the universe is in a particular process of mechanical interaction whether it is visible or not. Whenever we see it then it turns into light–mechanical motion or light-matter interaction. ...
Bablu Ghosh's user avatar
1 vote

Experimental status/test possibilities for baryon number conservation in LHC?

LHC events are too messy with too many missed or misidentified particles for direct baryon and anti-baryon counting to be an effective method to look for Baryon Number Violation (BNV), but limits can ...
David Bailey's user avatar
  • 11.3k
1 vote

Experimental status/test possibilities for baryon number conservation in LHC?

The most important thing to keep in mind is that the LHC cannot directly check baryon conservation because of limited kinematic coverage of the detectors (many fragments fly down the beam pipe), and ...
Thomas's user avatar
  • 18.7k
3 votes
Accepted

Custodial symmetry of the standard model symmetry group $SU(2)_L \times SU(2)_R$

I have included 5 links, including a "primary" one, which should help clear up the trail map for you; I think you've gone off it, but I can't be sure, as weird misconceptions have crept in. ...
Cosmas Zachos's user avatar
5 votes
Accepted

Average momentum of particle/anti-particle pairs

Your question hits on a lot of misconceptions, mostly derived from pop sci (YouTube) descriptions of virtual particles. There are at least two classes of virtual particles. Your favorite content ...
JEB's user avatar
  • 33.7k
2 votes

Experimental status/test possibilities for baryon number conservation in LHC?

The paper whose press release you cite looks at a number of baryons and other hadrons: In this Letter, we report the most precise estimation to date of $μ_B$ and $μ_Q$ obtained from a set of ...
rob's user avatar
  • 89.9k
4 votes

Average momentum of particle/anti-particle pairs

In special relativity, we want to keep track of the four-momentum since it transforms as a Lorentz covariant object. Taking that into account you can find a Lorentz invariant quantity, namely $p_\mu p^...
Lucky Charms's user avatar
3 votes

Why don't we include diagrams with fermion and gauge boson external lines while calculating the effective potential of Standard model?

As a Lorentz-invariant Lagrangian does not necessarily imply a Lorentz invariant ground state of the theory, Lorentz invariance might, in principle, be spontaneously broken just as well as an ...
Hyperon's user avatar
  • 6,173
0 votes

Effects of a hypothetical "proton-decay bomb" for a fictional story

Interesting idea for a bomb, although not wholly original: So called sphaleron processes thought to have happenend at very early stages of the universe can convert baryon number into lepton number. ...
Confuse-ray30's user avatar
1 vote

Determining free Fermi/Bose gas chemical potentials, given temperature, number density, and baryon density

Your expression for the chemical potential as a function of density is the usual text book result for a non-interacting classical gas (although $n_{max}$ is just terrible notation). I have been ...
Thomas's user avatar
  • 18.7k
0 votes

Why can't neutral pion decay to two neutrino's

I think the best answer is a chirality argument, much in the same way that $\Gamma( \pi^- \to \mu^- \overline{\nu}_\mu) \gg \Gamma (\pi^- \to e^- \overline{\nu}_e)$. See here. A $\pi^0$ has a $J^P = 0^...
Josh's user avatar
  • 1
1 vote

Likelihood of the creation of a single unbound quark in the collision of very high energy particle beams

The Quarks are bound together in a proton through the Strong Force. So to separate them you need to add enough energy to counter the Strong Force. But this amount of energy needed to separate them ...
Danny's user avatar
  • 11
1 vote
Accepted

Can we prove in general that gauge fields associated with broken generators form representations of the unbroken group?

I fail to imagine the contrapositive. Assuming there are no matter fields to be integrated out in an effective theory (in a rearrangement spoiling renormalizability), in a pure gauge theory of G, all ...
Cosmas Zachos's user avatar
1 vote

What order did the particles of nature appear in?

You are assuming that the four fundamental forces existed separated for all the time to add up to the standard model, whereas the point is the opposite: they separated by coalescing (getting unified) ...
Wel Xavier's user avatar
1 vote

Theoretical Electron Bunching paper, variable question

The phase $\varphi$ is just the phase of the oscillation in shown in figure 2 of the paper. There are lots of technical advantages to using the oscillating fields; in fact, that is much of what the ...
Buzz's user avatar
  • 16.1k
1 vote

Yang-Mills mass gap caused by gluonballs or because dark matter WIMPs?

There is no reason to believe gluonballs will be different in this respect than any other composite particle; in other words, we have no reason to believe that gluonballs will be dramatically lighter.
Wel Xavier's user avatar
1 vote

Are there different ways of using the term 'energy scale'?

In what are called natural units, energy has units of 1/length- so small lengths are naturally associated with high energies. A good explanation of how this works can be found in the opening chapters ...
niels nielsen's user avatar
0 votes

What exactly is kinetic energy?

When one talks about fundamental principles, then it appears that within the context of the standard model, there are likely two true fundamentals, viz. energy and matter, which are in themselves ...
Albertus Magnus's user avatar
0 votes

What exactly is kinetic energy?

Kinetic energy is the ability of a body to induce motion upon some other body by virtue of the motion of the body possessing it being in a state of motion. In other words, like all forms of energy, ...
Matt Hanson's user avatar
  • 3,112

Top 50 recent answers are included