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A universal inequality for CFT and quantum gravity

- S. Hellerman
- Physics
- 17 February 2009

We prove that every unitary two-dimensional conformal field theory (with no extended chiral algebra, and with c, $ \tilde{c} > 1 $) contains a primary operator with dimension ∆1 that satisfies $ 0 <… Expand

Geometric constructions of nongeometric string theories

- S. Hellerman, J. McGreevy, Brook Williams
- Mathematics
- 26 August 2002

We advocate a framework for constructing perturbative closed string compactifications which do not have large-radius limits. The idea is to augment the class of vacua which can be described as… Expand

On the CFT operator spectrum at large global charge

- S. Hellerman, D. Orlando, S. Reffert, Masataka Watanabe
- Physics
- 6 May 2015

A bstractWe calculate the anomalous dimensions of operators with large global charge J in certain strongly coupled conformal field theories in three dimensions, such as the O(2) model and the… Expand

Non-Birational Twisted Derived Equivalences in Abelian GLSMs

- A. Căldăraru, J. Distler, S. Hellerman, T. Pantev, E. Sharpe
- Mathematics
- 24 September 2007

In this paper we discuss some examples of abelian gauged linear sigma models realizing twisted derived equivalences between non-birational spaces, and realizing geometries in novel fashions. Examples… Expand

Compactification in the lightlike limit

- S. Hellerman, J. Polchinski
- Physics
- 5 November 1997

We study field theories in the limit that a compactified dimension becomes lightlike. In almost all cases the amplitudes at each order of perturbation theory diverge in the limit, due to strong… Expand

String theory and quintessence

- S. Hellerman, N. Kaloper, L. Susskind
- Physics
- 23 April 2001

We discuss the obstacles for defining a set of observable quantities analogous to an S-matrix which are needed to formulate string theory in an accelerating universe. We show that the quintessence… Expand

Light-like tachyon condensation in open string field theory

- S. Hellerman, M. Schnabl
- Physics
- 10 March 2008

A bstractWe use open string field theory to study the dynamics of unstable branes in the bosonic string theory, in the background of a generic linear dilaton. We find a simple exact solution… Expand

On the Large R-charge Expansion in N = 2 Superconformal Field Theories

- S. Hellerman, Shunsuke Maeda
- Physics
- 2017

In this note we study two point functions of Coulomb branch chiral ring elements with large R-charge, in quantum field theories with N = 2 superconformal symmetry in four spacetime dimensions.… Expand

String theory of the Regge intercept.

- S. Hellerman, I. Swanson
- PhysicsPhysical review letters
- 4 December 2013

Using the Polchinski-Strominger effective string theory in the covariant gauge, we compute the mass of a rotating string in D dimensions with large angular momenta J, in one or two planes, in fixed… Expand

Dimension-changing exact solutions of string theory

- S. Hellerman, I. Swanson
- Physics
- 7 December 2006

Superstring theories in the critical dimension D = 10 are connected to one another by a well-explored web of dualities. In this paper we use closed-string tachyon condensation to connect the… Expand

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