Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-10-09
PRD 2010
Physics
High Energy Physics
High Energy Physics - Theory
Some typos are corrected and references are added with respect to the published version. 17pages, 11fig
Scientific paper
We investigate the instanton solution between the degenerate vacua in curved space. We show that there exist $O(4)$-symmetric solutions not only in de Sitter but also in both flat and anti-de Sitter space. The geometry of the new type of solutions is finite and preserves the $Z_2$ symmetry. The nontrivial solution corresponding to the tunneling is possible only if gravity is taken into account. The numerical solutions as well as the analytic computations using the thin-wall approximation are presented. We expect that these solutions do not have any negative mode as in the instanton solution.
Lee Bum-Hoon
Lee Chul H.
Lee Wonwoo
Oh Changheon
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