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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