TL;DR
This paper explores the nature of the graviton as a bound state within open-string field theory, revealing how the flat metric emerges as a vacuum expectation value of an open string field.
Contribution
It clarifies the graviton's interpretation as a bound state and shows the flat metric as a vacuum value in open-string field theory, providing new insights into string interactions.
Findings
The flat metric is the vacuum value of an open string field.
The graviton appears as a composite bound state.
Open-string field theory describes gravity as a bound state phenomenon.
Abstract
We clarify the nature of the graviton as a bound state in open-string field theory: The flat metric in the action appears as the vacuum value of an OPEN string field. The bound state appears as a composite field in the FREE field theory.
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