Physics

To start with, we start with Lagrangian mechanics. Lagrangian mechanics states that the variation of the “action” with respect to every dynamical variable is zero. Suppose the action can be written in the form$$S=\int Ld\tau d\sigma$$ Then standard variational methods give the Euler-Lagrange equation$$\frac{\partial L}{\partial x}=\frac{\partial}{\partial\tau}\frac{\partial L}{\partial \frac{\partial x}{\partial \tau}}+\frac{\partial}{\partial\sigma}\frac{\partial L}{\partial \frac{\partial x}{\partial \sigma}}$$ For […]

Search the web and you can probably get thousands of posts purporting to “explain” string theory. However, this post will explain string theory more in-depth. This post also presents string theory as a natural extension of normal physics. Newton’s first law and the action principle Newton’s first law is the law of inertia. It states