10. Stefano Pasquero, On the Concepts of Frame of Reference and Connection in Space‐Time Bundles of Classical Mechanics

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Volume 17: Pages 526-535, 2004

On the Concepts of Frame of Reference and Connection in SpaceTime Bundles of Classical Mechanics

Stefano Pasquero

Dipartimento di Matematica dell'Università di Parma, Via D'Azeglio, 8543100, Parma, Italy

The definition of frame of reference in classical spacetime bundles is investigated in the general case of bundles whose fibers are not Euclidean and of frames without the rigidity requirement. The enrichment of the geometry of the bundle following from the presence of a frame of reference, viewed as a particular timelike vector field, is analyzed. Spacelike tensor fields, unless totally contravariant, are proved to be correctly defined only if a frame of reference H is assigned. The connection associated with H is introduced and the selection of special covariant and time derivatives associated with H is soundly motivated. The usual kinematic quantities relative to H are defined. The relationships between pairs of frames are examined and the concepts of relative rigidity, relative spin, and relative acceleration are defined and investigated. The main results of relative kinematics are shown to fit readily into this geometric context.

Keywords: classical spacetime, frame of reference, connection

Received: June 15, 2004; Published Online: December 15, 2008