Section outline

    • Problem sheet 1 (corrected) Assignment
      Opened: Thursday, 15 January 2026, 3:47 PM

      Hand in only solutions to Q2 and Q3(c)

      Due dates:  

      Class 1    Thursday, Week 3 by 10am

      Class 2    Monday, Week 4 by 10am

      Corrections in Q2:  fixed conventions; fixed statement about conservation to note that for open strings this is true only for Neumann boundary conditions and added a hint for the last part of Q2d.

    • Problem sheet 1: Solutions Assignment
      Opened: Saturday, 17 January 2026, 12:00 AM
    • Problem sheet 2 Assignment
      Opened: Thursday, 15 January 2026, 3:48 PM

      Hand in only solutions to Q1 and Q3.

      Due dates:  

      Class 1    Thursday, Week 5 by 10am

      Class 2    Monday, Week 6 by 10am

    • Problem sheet 2: Solutions Assignment
      Opened: Saturday, 17 January 2026, 12:00 AM

      Alison, Yuhan and Eleonora have very kindly written up these solutions (big thank you!).  Please let the class tutors know if you find any errors.  

    • Problem sheet 3 Assignment
      Opened: Thursday, 15 January 2026, 3:48 PM

      Hand in only solutions to Q2 and Q3 only.

      Class 1    Thursday, Week 7 by 10am

      Class 2    Monday, Week 8 by 10am

      Remark: This is a long problem sheet, and it is not expected that you will finish all of it. However, many of these are classic problems, and understanding their solutions is highly recommended! Please feel free to make liberal use of references where these calculations are at least sketched and pick your battles when it comes to carrying things out to the bitter end.

    • Problem sheet 3: Solutions Assignment
      Opened: Saturday, 17 January 2026, 12:00 AM

      I have included solutions of the first three questions.  For that last question please see Polchinski Vol 1 Sect 8.1 or BLT Sects 10.1 and 10.2.