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The public's perception of physics is that everything is pretty cut-and-dried; all the basics are known and it's now just a camiseta de futbol baratas routine matter of getting to that next decimal place in accuracy as well as dotting a few more of this and crossing a few more of that. The days of revolutionary physics that we saw in the early 20th Century with quantum mechanics and relativity are long gone now. Well, all that's not quite the case. There's a lot that's proposed, even accepted by most physicists, that's not really set in concrete. I think some mainstream physics, even some proposed challenges to the mainstream, are so far off the beaten track, way down south in La-La Land, as to be, for all practical purposes, as near to impossible as makes no odds. I think physics is in for a few more revolutions yet. ???
1) String Theory is one of those proposed challenges to the mainstream and replaces the standard model of particle physics by substituting tiny vibrating strings for all those particles, like electrons and quarks and neutrinos, etc. that we know so well. Different vibration rates determine whether something is an electron or an up-quark or a down-quark or a neutrino, etc. That in itself isn't too bad an alteration. Where string theory falls off the rails IMHO is that in order to work, the Universe has got to be comprised of not the standard three special dimensions and the one dimension in time we're used to existing in, but a total of ten, even eleven dimensions. Sorry, it's those extra dimensions that tip the weirdness quotient off the scales. String Theory wouldn't be too bad were there the slightest tad of experimental evidence for string ‘particles' and those additional dimensions. There isn't. That wouldn't be all that unusual if String Theory were camiseta italia something that was brand new. Alas, the theory has been around for way over three decades now, and it still just resides as pure hypothetical, albeit elegant (and extremely difficult to understand), mathematics. String Theory just is not going anywhere. It's a dead end. As far as I'm concerned, String Theory is impossible physics until such time as even the tiniest shred of experimental evidence is on the board. I'm not holding my breath.
2) The standard model of particle physics often states that elementary particles are ‘Point Particles'. So what are ‘Point Particles'? These are the fundamental particles that are in existence not as little billiard balls but as geometric points, points that are without extension (volume). In other words, a point has zero dimensions ? no length, no width, no height, no area and no volume. There's really something screwy somewhere if that is to be believable! The fundamental flaw is that particles, like the electron, have mass. You cannot cram mass, however tiny, into zero volume! So, an electron must have a volume, therefore an electron cannot be a ‘Point Particle". So what's the rational? Though never explicitly stated, I suspect it has an awful lot to do with keeping the maths simple! It's easier to deal with a ‘Point Particle' when crunching the numbers than adding in all sorts of other variables and complications like mass and volume. Unfortunately, I've read way too many physics tomes where the concept of zero volume seems to be taken literally ? at face value. If that's the case, then those who apparently advocate such a position are akin to the White Queen.
3) Lack of causality in a process really bothers me. It's akin to getting something from nothing ? a free lunch. There are two such ‘free lunches' advocated. One is the Big Bang scenario that kick-started our Universe off. After a lot of physics and chemistry, that ultimately led to biological entities - you and me. camiseta méxico I'll have more, much more to say about the Big Bang's free lunch later on.