What is mock modular formulae?

Hi Sreehari, I came to hear of certain physical aspects of the Mock modular forms through an international workshop held at IMSc (Chennai, INDIA) in April, 2014. [1] Mathieu moonshine relates the geometry of K3 surfaces to the representations of the Mathieu group M24, and to a certain mock modular

In mathematics, a mock modular form is the holomorphic part of a harmonic weak maass form, and a mock theta function is essentially a mock modular form of weight 1/2. The first examples of mock theta functions were described by Srinivasa Ramanujan in his last 1920 letter to G. H. Hardy and in his lo