what is your explanation for them?
I'm not speaking for
@Tiburon, but yours is an interesting question, and I wanna take a stab at it.
First off, I don't claim to know why they exist.
I have a few ideas, though. The
weak anthropic principle helps describe one of them, in that we wouldn't exist (in this form) to have this discussion if those constants were different.
Put in a different way, you wouldn't exist if your parents never met each other. You can place some deep fundamental meaning to their meeting and relationship, but the fact is that without them, you wouldn't be here place any kind of meaning upon that relationship.
As such, one of my explanations is that the constants exist simply because without them, we wouldn't exist to ask why they exist; they are a brute fact of existence.
---
I haven't been following cosmology and particle physics like I used to. but as I understand it, there could be other universes with constants different from ours. Life would likely be completely different in those universes, such that we couldn't exist there. Physicists have been working with the idea that a stable universe can only exist in certain combinations of constants; there may well be more than one stable configuration. All we know is that our universe has
this configuration; we shouldn't jump to conclusions by assuming that ours is the only universe in which life could exist.