Closed string tachyon potential and tt∗tt^* equation

Recently Dabholkar and Vafa proposed that closed string tachyon potential for non-supersymmetric orbifold \C/\Z_3 in terms of the solution of a $tt^*$ equation. We extend this result to \C^2/\Z_n for $n=3,4,5$. Interestingly, the tachyon potentials for $n=3$ and 4 are still given in terms of the solutions of Painleve III type equation that appeared in the study of \C^1/\Z_3 with different boundary conditions. For \C^2/\Z_5 case, governing equations are of generalized Toda type. The potential is monotonically decreasing function of RG flow.Comment: 15 pages, reference added. to appear in PL

Oral History Interview with Leong Kwong Sin: Conceptualising SMU

This is an abridged version of the original interview. Please contact the Library at [email protected] for access to the full version of the transcript and/or audio recording.</p

Revisiting the Quark-Lepton Complementarity and Triminimal Parametrization of Neutrino Mixing Matrix

We examine how a parametrization of neutrino mixing matrix reflecting quark-lepton complementarity can be probed by considering phase-averaged oscillation probabilities, flavor composition of neutrino fluxes coming from atmospheric and astrophysical neutrinos and lepton flavor violating radiative decays. We discuss about some distinct features of the parametrization by comparing with the triminimal parametrization of perturbations to tri-bimaximal neutrino mixing matrix.Comment: 9 pages, references adde