Blar i ODA Open Digital Archive på forfatter "Bræck, Simen"
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Inertial Frame Dragging and Relative Rotation of ZAMOs in Axistationary Asymptotically Flat Spacetimes
Bræck, Simen (Universe;, Peer reviewed; Journal article, 2023)In axistationary, asymptotically flat spacetimes, zero angular momentum observers (ZAMOs) define an absolute standard of non-rotation locally, as can be verified by the absence of any Sagnac effect for these observers. ... -
A physical interpretation of Hubble’s law and the cosmological redshift from the perspective of a static observer
Bræck, Simen; Elgarøy, Øystein (General Relativity and Gravitation;44 (10), Journal article; Peer reviewed, 2012-07-18)We derive explicit and exact expressions for the physical velocity of a free particle comoving with the Hubble flow as measured by a static observer, and for the frequency shift of light emitted by a comoving source and ... -
Relativistic dynamics for hydrogenlike systems
Kjellsson, Tor; Selstø, Sølve; Bræck, Simen; Lindroth, Eva (Peer reviewed; Journal article, 2015)The interaction between super intense laser pulses and hydrogenlike systems is investigated. We aim to study cases where the field drives the electron up to velocities of v~0.5c, where relativistic effects are believed to ... -
The Cosmic Causal Mass
Bræck, Simen; Grøn, Øyvind; Farup, Ivar (Journal article; Peer reviewed, 2017)In order to provide a better understanding of rotating universe models, and in particular the Gödel universe, we discuss the relationship between cosmic rotation and perfect inertial dragging. In this connection, the concept ...