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Bubble fluctuations in Omega less than 1 inflation Garriga Torres, Jaume Teoria de camps (Física) Ones gravitacionals Field theory (Physics) Gravitational waves In the context of the open inflationary universe, we calculate the amplitude of quantum fluctuations which deform the bubble shape. These give rise to scalar field fluctuations in the open Friedmann-Robertson-Walker universe which is contained inside the bubble. One can transform to a new gauge in which matter looks perfectly smooth, and then the perturbations behave as tensor modes (gravitational waves of very long wave-length). For ( 1 − Ω ) ≪ 1 , where Ω is the density parameter, the microwave temperature anisotropies produced by these modes are of order δ T T ∼ H ( R 0 μ l ) − 1 2 ( 1 − Ω ) l 2 . Here, H is the expansion rate during inflation, R 0 is the intrinsic radius of the bubble at the time of nucleation, μ is the bubble wall tension, and l labels the different multipoles ( l > 1 ). The gravitational back reaction of the bubble has been ignored. In this approximation, G μ R 0 ≪ 1 , and the new effect can be much larger than the one due to ordinary gravitational waves generated during inflation (unless, of course, Ω gets too close to 1, in which case the new effect disappears). 2010-05-06T08:53:49Z 2010-05-06T08:53:49Z 1996 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0556-2821 https://hdl.handle.net/2445/12336 507982 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.54.4764 Physical Review D, 1996, vol. 54, núm. 8, p. 4764-4769 http://dx.doi.org/10.1103/PhysRevD.54.4764 (c) The American Physical Society, 1996 info:eu-repo/semantics/openAccess 6 p. application/pdf The American Physical Society Articles publicats en revistes (Física de la Matèria Condensada)