This final degree project is thought to be a theoretical enlargement of the degree knowledge in order
to broaden the basic concepts of mathematics and theoretical physics applied to the formulation of
String theory.
In this essay, we will make an introduction to the theory of quantum bosonic strings. The ultimate
objective of this final project will be to formulate the hypothetical gravity force carrier particle, and
how to recover the Einstein´s equations from String theory.
This piece of work will commence by making a classical approach to the relativistic string for the
purpose of formulating important results that we will use to quantize it.
We will quantize the theory in three different ways. Firstly, the Canonical Quantization will be applied,
secondly, the Lightcone Quantization will be used and, lastly, we will utilize the one needed in order
to formulate the general relativity which is The Path Integral approach.
