Aspects of Born-Infeld Theory and String/M-Theory
G W Gibbons

TL;DR
This paper offers a pedagogic overview of Born-Infeld theory's role in String/M-Theory, emphasizing causality, metrics, and strong coupling limits, providing new insights into string dynamics and tachyon condensation.
Contribution
It introduces new perspectives on causality and metrics in Born-Infeld theory and explores strong coupling limits relevant to string and M-theory phenomena.
Findings
Insights into causality with open and closed string metrics
Analysis of strong coupling limits of Born-Infeld and M5-brane theories
Implications for tachyon condensation in string theory
Abstract
These notes provide a hopefully pedagogic introduction to Born-Infeld theory and some of its uses in String/M-Theory from the perspective of some-one interested in spacetime geometry. Causality and the consequences of having both the open string and closed string metric are stressed. This leads to some new insighst into old problems, such as strings at finite temperature. Various strong coupling limits of both Born-Infeld and the M5-brane theories are described and their relevance for tachyon condensations are mentioned.
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