Department of Theoretical Physics

National Institute of Physics and Nuclear Engineering - Horia Hulubei

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Nonstandard Lagrangian in Cosmology - Constrained System

Dragoljub Dimitrijevic, University of Nis

23.04.2018

We study dynamics of a tachyon scalar field of the Dirac-Born-Infeld type Lagrangian. In the simplest case the tachyon field is minimally coupled to gravity, which should be considered as a constrained system. We can expand the phase space and define an extended model by introducing an auxiliary field and its canonically conjugated momentum. We discuss constraints of extended model.

 

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Department of Theoretical Physics
National Institute of Physics and Nuclear Engineering
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