String Theory

String theory is a theory of quantum gravity that provides a unified description of gravity and particle physics. it is a theoretical framework  in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. The theory describes how these strings propagate through space and interact with each other.

  • What is the true nature of the universe – humans came up with stories to describe the world.
  • we test our stories to see what to keep and what to throw away.
  • string theory is one of the stories we come up with to explain the nature of everything
  • we thought that the atoms were the final layer of reality.
  • we can’t see anything until we interact with it.
  • some of the particles are too small that  visible light passes over them.
  • we can solve this by creating electromagnetic wave length with much smaller wave length.
  • more wavelength mean more energy.
  • Quarks, leptons, bosons all standard models are built on the particles.
  • since there is no way to precisely measure things in the quantum world, the story of gravity doesn’t work with the story of quantum physics.
  • when physicist tried to add a gravity to the story by inventing a new particle their mathematics broke-down.
  • if we could marry gravity to quantum physics and the standard model we would have the theory of everything.
  • so scientist came up with a new story Whats more complex than a point, a line or a string,  string theory was born.
  • the string theory is more elegant because it describes many different elementary particles as different modes of vibration of the string.
  • a string can give different particles, most importantly, these includes gravity .
  • string theory promised to unify all fundamental forces of the universe.
  • this cased excitement because string theory could graduate to theory of everything.
  • but the string theory came up with limitations.
  • it doesn’t work in our universe.
  • it requires 10 dimensions to work.
  • no one has been able to work it work so string theory has not been able to reveal the true nature of the universe.
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