Born-Infeld Theory and Stringy Causality

TL;DR

This paper explores how fluctuations in Born-Infeld theory propagate according to the Boillat metric, examining causality, black hole solutions, and connections to higher-curvature gravity and Einstein-Schrödinger theory.

Contribution

It demonstrates the role of the Boillat metric in Born-Infeld theory, analyzes causality and black hole properties, and links the Born-Infeld action to higher-curvature gravity and Einstein-Schrödinger theory.

Findings

The Boillat metric governs fluctuation propagation and is S-duality invariant.

Causality cones of open and closed strings touch along null directions, ensuring no causality violation.

Black hole horizons and thermodynamics are independent of the choice of metric (open or closed string).

Abstract

Fluctuations around a non-trivial solution of Born-Infeld theory have a limiting speed given not by the Einstein metric but the Boillat metric. The Boillat metric is S-duality invariant and conformal to the open string metric. It also governs the propagation of scalars and spinors in Born-Infeld theory. We discuss the potential clash between causality determined by the closed string and open string light cones and find that the latter never lie outside the former. Both cones touch along the principal null directions of the background Born-Infeld field. We consider black hole solutions in situations in which the distinction between bulk and brane is not sharp such as space filling branes and find that the location of the event horizon and the thermodynamic properties do not depend on whether one uses the closed or open string metric. Analogous statements hold in the more general context of non-linear electrodynamics or effective quantum-corrected metrics. We show how Born-Infeld action to second order might be obtained from higher-curvature gravity in Kaluza-Klein theory. Finally we point out some intriguing analogies with Einstein-Schr\"odinger theory.