Jeong-Hyuck Park Research Program
Gravity of Closed Strings
A Research Program
What is the gravitational theory naturally implied by closed string theory?
Research is driven by questions, not by calculations.
This document formulates a problem before naming a theory. It is written for researchers and students who wish to think carefully about the gravitational content of the universal massless sector of closed string theory.
Program Order
The purpose of the Research Program is to make the order explicit: observation, question, working hypothesis, research program, tests, open problems, and invitation.
The Question
The central question and the universal closed-string massless sector \( \{g_{\mu\nu}, B_{\mu\nu}, \phi\} \).
Research Vision
Hypothesis A, Hypothesis B, and the logical gap between General Relativity and closed-string gravity.
Geometry
Doubled-yet-gauged spacetime, connection, curvature, covariant derivatives, and non-Riemannian structures.
Field Equation
The Einstein Double Field Equation \(G_{AB}=T_{AB}\) as a proposed field equation of closed-string gravity.
Propagation
Universal \(O(D,D)\)-covariant propagation, the box operator, and gravitational waves.
Phenomenology
Post-Newtonian gravity, cosmology possibly without a dark sector, black holes, wormholes, and tests.
Open Problems
Mathematical and physical tests, missing ingredients, and falsifiable directions.
Outlook
The program remains intentionally unfinished. Its future depends on the people who choose to work on it.
Editorial Note
The PDF and HTML presentation of this Research Program was prepared with the assistance of AI tools under the direction of the author. The scientific ideas, research vision, interpretations, and conclusions are solely those of the author.