At last from 1968 physicists decided that instead of a
‘point particle’ they will use ‘a string – particle’ and developed
‘ string theory’.
You say 'physicists'. The fact is that some theoretical physicists have been working on string theory. Others have been working on other theories. There are a number of candidates for the final theory, and none of them is really well developed.
When I say that none of the candidates is well developed I am exempting QM, and GR. They are both well developed and work extremely well.
And of course it has been a long time since physics considered particles to be point objects. QM has been developed based on the idea that particles are wave functions, not points. In some areas particles can be considered to be points for ease of computation, but there are getting to be fewer of those places all the time.
Bill Gill
