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" ... One of the most important symmetries in all of physics is known as time-reversal symmetry. Put simply, it says that the laws of physics obey the same rules whether you run the clock forwards or backwards. There are many examples where one phenomenon, if you run the clock forwards, corresponds to an equally valid phenomenon if you run the clock backwards. For example: ... "
" ... Quantum gravity tries to combine Einstein’s general theory of relativity with quantum mechanics.... [+] Quantum corrections to classical gravity are visualized as loop diagrams, as the one shown here in white. Many symmetries that are mandated in the Standard Model could be only approximate symmetries in a theory of quantum gravity. ... "
" ... There are three symmetries that are both discrete and fundamental in the context of the Standard Model of particle physics: ... "
" ... This “mirror symmetry” is one of the three fundamental classes of symmetries we can apply to particles and the laws of physics. In the early half of the 20th century, we thought that there were certain symmetries that were always preserved, and three of them were: ... "
" ... there are a lot of symmetries that you could imagine would be respected, but simply aren’t. You could imagine that the three forces of the Standard Model would unify into a single one at high energies in some sort of grand unification. You could imagine that for every fermion, there would be a corresponding boson, as in supersymmetry. And you can imagine that, at the highest energies of all, that even gravity gets unified with the other forces in a so-called “theory of everything.” ... "