85 citations · 827 across the 51 of their papers we have counts for
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decomposition of denominator formulae of some BKM Lie superalgebras -- II
Suresh Govindarajan, Mohammad Shabbir
The square-root of Siegel modular forms of CHL Z_N orbifolds of type II compactifications are denominator formulae for some Borcherds-Kac-Moody Lie superalgebras for N=1,2,3,4. We…
Positivity of discrete information for CHL black holes
Suresh Govindarajan, Sutapa Samanta, P Shanmugapriya +1
Black holes carry more information about the microstates than just the total degeneracy. As a concrete example, the Z(N)-twined helicity trace indices for 1/4-BPS black holes of th…
decomposition of denominator formulae of some BKM Lie superalgebras
Suresh Govindarajan, Mohammad Shabbir, Sankaran Viswanath
We study a family of Siegel modular forms that are constructed using Jacobi forms that arise in Umbral moonshine. All but one of them arise as the Weyl-Kac-Borcherds denominator fo…
Mathieu Moonshine and Siegel Modular Forms
Suresh Govindarajan, Sutapa Samanta
A second-quantized version of Mathieu moonshine leads to product formulae for functions that are potentially genus-two Siegel Modular Forms analogous to the Igusa Cusp Form. The mo…
Black Hole Hair Removal For N=4 CHL Models
Subhroneel Chakrabarti, Suresh Govindarajan, P Shanmugapriya +2
Although BMPV black holes in flat space and in Taub-NUT space have identical near-horizon geometries, they have different indices from the microscopic analysis. For K3 compactifica…
BKM Lie superalgebras from counting twisted CHL dyons -- II
Suresh Govindarajan, Sutapa Samanta
We revisit our earlier work which lead to a periodic table of Borcherds-Kac-Moody algebras that appeared in the context of the refined generating function of quarter-BPS (dyons) in…
Two moonshines for but none for
Suresh Govindarajan, Sutapa Samanta
In this paper, we revisit an earlier conjecture by one of us that related conjugacy classes of to Jacobi forms of weight one and index zero. We construct Jacobi forms for…
A non-commuting twist in the partition function
Suresh Govindarajan, Karthik Inbasekar
We compute a twisted index for an orbifold theory when the twist generating group does not commute with the orbifold group. The twisted index requires the theory to be defined on m…
BKM superalgebras from counting dyons in N=4 supersymmetric type II compactifications
Suresh Govindarajan, Dileep P. Jatkar, K. Gopala Krishna
We study the degeneracy of quarter BPS dyons in N =4 type II compactifications of string theory. We find that the genus-two Siegel modular forms generating the degeneracies of the…
Unravelling Mathieu Moonshine
Suresh Govindarajan
The D1-D5-KK-p system naturally provides an infinite dimensional module graded by the dyonic charges whose dimensions are counted by the Igusa cusp form, Phi_{10}(Z)$. We show that…
BKM Lie superalgebras from counting twisted CHL dyons
Suresh Govindarajan
Following Sen[arXiv:0911.1563], we study the counting of (`twisted') BPS states that contribute to twisted helicity trace indices in four-dimensional CHL models with N=4 supersymme…
BKM Lie superalgebras from dyon spectra in Z_N-CHL orbifolds for composite N
Suresh Govindarajan, K. Gopala Krishna
We show that the generating function of electrically charged 1/2-BPS states in N=4 supersymmetric Z_N-CHL orbifolds of the heterotic string on T^6 are given by multiplicative eta-p…
A note on perturbative aspects of Leigh-Strassler deformed N=4 SYM theory
Kallingalthodi Madhu, Suresh Govindarajan
We carry out a perturbative study of the Leigh-Strassler deformed N=4 SYM theory in order to verify that the trihedral Delta(27) symmetry holds in the quantum theory. We show that…
Symplectic potentials and resolved Ricci-flat ACG metrics
Aswin K. Balasubramanian, Suresh Govindarajan, Chethan N. Gowdigere
We pursue the symplectic description of toric Kahler manifolds. There exists a general local classification of metrics on toric Kahler manifolds equipped with Hamiltonian two-forms…
Chiral primaries in the Leigh-Strassler deformed N=4 SYM -- a perturbative study
Kallingalthodi Madhu, Suresh Govindarajan
We look for chiral primaries in the general Leigh-Strassler deformed N=4 super Yang-Mills theory by systematically computing the planar one-loop anomalous dimension for single trac…
Toric Kahler metrics and AdS_5 in ring-like co-ordinates
Bobby S. Acharya, Suresh Govindarajan, Chethan N. Gowdigere
Stationary, supersymmetric supergravity solutions in five dimensions have Kahler metrics on the four-manifold orthogonal to the orbits of a time-like Killing vector. We show that a…
Effective superpotentials for B-branes in Landau-Ginzburg models
Suresh Govindarajan, Hans Jockers
We compute the partition function for the topological Landau-Ginzburg B-model on the disk. This is done by treating the worldsheet superpotential perturbatively. We argue that this…
Fractional two-branes, toric orbifolds and the quantum McKay correspondence
Bobby Ezhuthachan, Suresh Govindarajan, T. Jayaraman
We systematically study and obtain the large-volume analogues of fractional two-branes on resolutions of orbifolds C^3/Z_n. We study a generalisation of the McKay correspondence pr…
Tachyon Condensation on the Elliptic Curve
S. Govindarajan, H. Jockers, W. Lerche +1
We use the framework of matrix factorizations to study topological B-type D-branes on the cubic curve. Specifically, we elucidate how the brane RR charges are encoded in the matrix…
A quantum McKay correspondence for fractional 2p-branes on LG orbifolds
Bobby Ezhuthachan, Suresh Govindarajan, T. Jayaraman
We study fractional 2p-branes and their intersection numbers in non-compact orbifolds as well the continuation of these objects in Kahler moduli space to coherent sheaves in the co…
Crosscaps in Gepner Models and Type IIA Orientifolds
Suresh Govindarajan, Jaydeep Majumder
As a first step to a detailed study of orientifolds of Gepner models associated with Calabi-Yau manifolds, we construct crosscap states associated with anti-holomorphic involutions…
Orientifolds of type IIA strings on Calabi-Yau manifolds
Suresh Govindarajan, Jaydeep Majumder
We identify type IIA orientifolds that are dual to M-theory compactifications on manifolds with G_2-holonomy. We then discuss the construction of crosscap states in Gepner models.…
D-branes on Calabi-Yau Manifolds and Superpotentials
Michael R. Douglas, Suresh Govindarajan, T. Jayaraman +1
We show how to compute terms in an expansion of the world-volume superpotential for fairly general D-branes on the quintic Calabi-Yau using linear sigma model techniques, and show…
Disc Instantons in Linear Sigma Models
Suresh Govindarajan, T. Jayaraman, Tapobrata Sarkar
We construct a linear sigma model for open-strings ending on special Lagrangian cycles of a Calabi-Yau manifold. We illustrate the construction for the cases considered by Aganagic…