Story of a & c


Tachikawa, Y. (2008). Story of a & c. Perimeter Institute. https://pirsa.org/08120057


Tachikawa, Yuji. Story of a & c. Perimeter Institute, Dec. 11, 2008, https://pirsa.org/08120057


          @misc{ pirsa_08120057,
            doi = {10.48660/08120057},
            url = {https://pirsa.org/08120057},
            author = {Tachikawa, Yuji},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Story of a \& c},
            publisher = {Perimeter Institute},
            year = {2008},
            month = {dec},
            note = {PIRSA:08120057 see, \url{https://pirsa.org}}

Yuji Tachikawa University of Tokyo


In two dimensional CFTs the Zamolodchikov\'s c-theorem is fundamental in that it shows that the number of degrees of freedom decreases along the renormalization group flow. I will give a short history of and discuss recent developments in the quest to find its four-dimensional analogue using the central charges a & c.