S. Subramanian

activity

20022017

collaborators

6 papers

math.AG2017

A universal Torelli theorem for elliptic surfaces

C. S. Rajan, S. Subramanian

Given two semistable, non potentially isotrivial elliptic surfaces over a curve $C$ defined over a field of characteristic zero or finitely generated over its prime field, we show…

math.AG2014

The non-properness of the functor of F-trivial bundles

Vikram B. Mehta, S. Subramanian

We study the properness of the functor of $F$ -trivial bundles by relating it to the base change question for the fundamental group scheme of Nori.

math.AG2014

Torsors on Affine Varieties

S. Subramanian

Let $X$ be a smooth affine algebraic variety over the field of complex numbers which is contractible. Then every algebraic $G$ -torsor on $X$ is algebraically trivial if $G$ is a se…

math.AG2010

Principal bundles over finite fields

Indranil Biswas, S. Subramanian

Let M be an irreducible smooth projective variety defined over \bar{{\mathbb F}_p}. Let π(M, x_0) be the fundamental group scheme of M with respect to a base point x_0. Let G be a…

math.AG2004

Forms of Affine Space

S. Subramanian

Let $k$ be any field and $k^{s}$ its separable closure. Let $X$ be an affine variety over $k$ which is isomorphic to affine $n$ -space over the field extension $k^{s}$ . Then $X$ is isom…

math.AG2002

Moduli of Principal Bundles in Positive Characteristic

Vikram B. Mehta, S. Subramanian

In this paper we construct the moduli of semistable principal bundles with structure group a semisimple group, over nonsingular curves in positive characteristic, with good bounds…