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  1. Vanadium 50

    A Binding energies with muonic structures

    If you mean the (p mu) isn't bound to the (mu e), I agree. If you mean the (p mu) and/or the (mu e) are unstable, I disagree. If you are not certain that {(p mu mu) e+} will not fall apart to (p mu) and (mu e), I definitely agree.
  2. Vanadium 50

    B What is the brightest red dwarf star seen from the Earth?

    Five seconds with Google tells me it's Lacaille 8760.
  3. Vanadium 50

    Term for archaeological methods for dating things?

    If he's looking for a word other than "dating" that includes radioisotope dating, dendrochronology, geologic strata, etc. I don't think there is one in English. I bet German has a really long word for it, though!
  4. Vanadium 50

    Term for archaeological methods for dating things?

    "Chronological dating" doesn't do it for you?
  5. Vanadium 50

    A Binding energies with muonic structures

    This is turning into a semantic argument. I don't see any problem with (p mu mu) e+ being considered covalent (or at least more covalent) and (p mu) (mu e) being considered ionic. Relative stability is important. Going back to the H- ion, if you just use 1S wavefunctions, you find it is bound...
  6. Vanadium 50

    I Why a massive body is easier to break than a tiny body?

    I have no idea what you are talking about. If you are talking specifically about nuclei and not generic "massive bodies", you should say so.
  7. Vanadium 50

    A Binding energies with muonic structures

    We most certainly consider where the electrons want to go. The question here is exactly analogous to bonding - does the electron move to the other heavy guy?
  8. Vanadium 50

    I Is Gravity Part Of The Standard Model?

    I have usually heard it called "The Standard Model of Particle Physics" and thus far there is not a particle physics calculation that involves gravity. But isn't this stamp collecting?
  9. Vanadium 50

    A Binding energies with muonic structures

    The total binding is of a larger scale. If you are talking about removing one particle, you need to say which one.
  10. Vanadium 50

    A Binding energies with muonic structures

    This might be better off in atomic physics. Also, my x200 calculation in the previous post might have had one too many muons in it. Let's start with the H- ion, since that's in many textbooks. The physics also quite beautiful. We start by choosing a candidate 1S wavefunction for both...
  11. Vanadium 50

    I Do gravitational time dilation and quantum mechanics directly contradict each other about how frequencies scale with energy?

    You are surprised that non-relativistic quantum mechanics doesn't work in the relativistic regime?
  12. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    It might be instructive to look at the differences between 2019 and 1929. One is that investors were more highly leveraged then, and since then regulations have been put in place limiting margin. Indeed, the idea of slow-paying one's mortgage has been premised on the idea that it's better to...
  13. Vanadium 50

    I New source of space radiation

    Except that it doesn't. Cyclotrons have only weak focusing. A circular orbit has no restoring force perpendicular to the plane, so you need to either a) continually accelerate and extract before the beam hits the floor or the ceiling, or b) put the beam on a potato-chip shaped orbit so that...
  14. Vanadium 50

    A Future of the electron neutrino mass limits

    Itr is defined on page 2, line 8. You simply have to put more effort. I don't think it's PF's job to read the paper for you.
  15. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    No, that's not what you did. You told StaGuy2000 what to do. Had you said "I have had good luck with technology funds" I wouldn't have complained. But you decided instead to say "invest in technology investment funds. You should be able get over 20%+ return per annum."
  16. Vanadium 50

    How is "worth of goods" calculated with reference to tariffs?

    That's done the same way. The US imports $60M worth of pickles per year. This is the sum of all the invoices from people who bought foreign-produced pickles. If a pickle tariff is passed, it applies to $60M of pickles annually.
  17. Vanadium 50

    A Future of the electron neutrino mass limits

    You are misrepresenting what they wrote. Orodruin is right, there is no such thing as the "mass of an electron neutrino". Furthermore, the author of that paper never claim that is what they are calculating, and indeed, the words "electron neutrino" don't even appear.
  18. Vanadium 50

    How is "worth of goods" calculated with reference to tariffs?

    And who'd have thunk it, but the US is a net exporter of pickles, with a trade surplus of $2.3M.
  19. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    Yes, but a) ATT:LSE hasn't been around for 20 years, and b) the fact you can pick one fund after the fact that did well is a whole different kettle of fish from being able to pick one beforehand that will go up a factor of 38. This is painfully close to the advice, "Buy a stock and when it goes...
  20. Vanadium 50

    How is "worth of goods" calculated with reference to tariffs?

    When you bought the pickles you are importing, you paid a certain price. The duty is based on that price.
  21. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    You do see the irony of providing investment advice yourself after point (2)? 20% return per year over 20 years is a factor of 38. Are you really telling Statguy2000 that if he wants to retire with a million dollars 20 years from now, he can do this for $2100/month for one year and then he can...
  22. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    Well, the SEC margin requirements are set so that if the market tanks you don't lose your house. No pun intended. Your proposal essentially adds home equity as collateral to allow the investor to be more highly leveraged. Is this a good idea? For some people, yes, and for others, no. But...
  23. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    This is essentially the same as paying off your mortgage but investing on margin. (Only with less of a regulation safety net) This increases your leverage, allowing you to capture more gains. At a cost of increased risk, of course.
  24. Vanadium 50

    Other Is it worth it to go back and get a second degree in physics?

    Ask a clearer question? :oldwink: You say you don't want another bachelor's degree experience but your title question asks if it is worth it? Haven't you answered your own question?
  25. Vanadium 50

    Concerns regarding the ability to retire comfortably after age 65

    Everything is built into the price at some level. But in this case, that's not primarily what is going on behind the curtain. The 0% loan incentive is designed to get people in the showroom, where the vast majority of the people will be told their credit isn't good enough for the 0% loan ...
  26. Vanadium 50

    I Do gravitational time dilation and quantum mechanics directly contradict each other about how frequencies scale with energy?

    "frequencies of things" is vague, and assumes exactly the same scaling laws in all cases, which we know is wrong. A spring feels a force proportional to r. A charged body feels a force proportional to 1/r2.
  27. Vanadium 50

    B Matter/antimatter hybrid atomic structures?

    We're getting off the track, but... There is definitely a non-linearity (you can see it in the Hamiltonian), but you can see how the H- is bound semil-classically: one electron is near the proton forming an Hydrogen-atom like state, and the other is far away. The wavefunction is such that the...
  28. Vanadium 50

    B Matter/antimatter hybrid atomic structures?

    You're correct that this doesn't last any longer than the muons do, but I don't think this configuration is even stable. It is energetically favorable for it to rearrange to a muonic hydrogen atom and a (anti-)muonium atom. The H- ion is barely bound and both the muonic hydrogen atom and...
  29. Vanadium 50

    B Matter/antimatter hybrid atomic structures?

    What "orbital shell"? A positron cannot orbit a nucleus because the force between the positron and the nucleus is not attractive.
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