String Theory (Vols 1 and 2)

by Joseph Polchinski

This book includes the key early ideas of what’s known as the second superstring revolution. That is where Polchinski made his own greatest contribution, which goes by name of the D-brane. These are some of the ideas that Polchinski brought into the field, through his research papers, and he captured those ideas in his book in an elegant and very systematic way. It’s this gorgeously edited and refined book and he also retains an impressive website where he’s caught all the errors in the equations and corrected them.