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126.96.36.199 said in edit line "In an accelerated frame there is no curved spacetime" which DMS. Accelerated frames are extremely useful in many spacetimes, including Minkowski vacuum and also various curved spacetimes. Also, frames are a coordinate-free concept and can be written in various coordinate charts. Thus one has the Rindler frame (on part of Mink) which can be expressed in various charts; see Rindler coordinates-Bell's spaceship paradox. One has the Langevin frame (on part of Mink) which can also be expressed in various charts; see Born coordinates-Ehrenfest paradox.---CH 23:08, 13 June 2006 (UTC)