2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55677String dynamics near the photon sphere in Schwarzschild spacetime is considered on the basis of a perturbative approach with respect to a rescaled string tension as a small parameter. The perturbative string solution in the zeroth and first approximation is presented. The perturbative solution corresponds to a small deformations of the photon sphere in Schwarzschild spacetime.REVTEX, 8 pages, no figuresHigh Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext