A reflection about a distinguished point in the tortoise coordinate maps the Regge-Wheeler problem to a mirror version with the same QNM spectrum and provides an image interpretation of the lightcone distance controlling convergence of Schwarzschild retarded Green functions.
From Defects to Boundaries
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abstract
In this paper we describe how relativistic field theories containing defects are equivalent to a class of boundary field theories. As a consequence previously derived results for boundaries can be directly applied to defects, these results include reduction formulas, the Coleman-Thun mechanism and Cutcosky rules. For integrable theories the defect crossing unitarity equation can be derived and defect operator found. For a generic purely transmitting impurity we use the boundary bootstrap method to obtain solutions of the defect Yang-Baxter equation. The groundstate energy on the strip with defects is also calculated.
years
2026 2verdicts
UNVERDICTED 2representative citing papers
Derives additivity and fusion rules for defect g-functions in integrable 2D QFT, with effective amplitudes for non-topological cases and lowered entropy contribution in Ising non-topological fusion.
citing papers explorer
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Radial Mirror Scattering and the QNM Convergence Region
A reflection about a distinguished point in the tortoise coordinate maps the Regge-Wheeler problem to a mirror version with the same QNM spectrum and provides an image interpretation of the lightcone distance controlling convergence of Schwarzschild retarded Green functions.
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Fusion of Integrable Defects and the Defect $g$-Function
Derives additivity and fusion rules for defect g-functions in integrable 2D QFT, with effective amplitudes for non-topological cases and lowered entropy contribution in Ising non-topological fusion.