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Perturbations on domain walls and strings: A covariant theory

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A covariant formalism is developed for describing perturbations on vacuum domain walls and strings. The treatment applies to arbitrary domain walls in (N+1)-dimensional flat spacetime, including the case of bubbles of a true vacuum nucleating in a false vacuum. Straight strings and planar walls in de Sitter space, as well as closed strings and walls nucleating during inflation, are also considered. Perturbations are represented by a scalar field defined on the unperturbed wall or string world sheet. In a number of interesting cases, this field has a tachyonic mass and a nonminimal coupling to the world-sheet curvature.

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GARRIGA TORRES, Jaume, VILENKIN, A. (alexander). Perturbations on domain walls and strings: A covariant theory. _Physical Review D_. 1991. Vol. 44, núm. 4, pàgs. 1007-1014. [consulta: 24 de gener de 2026]. ISSN: 0556-2821. [Disponible a: https://hdl.handle.net/2445/12328]

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