Free String Theory PDF Books

Introduction to String Theory

Introduction to String Theory
By Gerard 'T Hooft

Introduction to String Theory

Introduction to String Theory
By Thomas Mohaupt

What is String Theory?

What is String Theory?
By Joseph Polchinski

Strings and Geometry

Strings and Geometry
By M. Douglas,J. Gauntlett,M. Gross

Lectures on String Theory

Lectures on String Theory
By Gleb Arutyunov

D-Branes, Tachyons, and String Field Theory

D-Branes, Tachyons, and String Field Theory
By Washington Taylor,Barton Zwiebach