2014/01/31 by V. A. Rubakov · 1 citation
Physics and Astronomy · #gr-qc #hep-th
paper · pdf · doi:10.3367/ufne.0184.201402b.0137
Mini-review, prepared for Physics Uspekhi, references added
arxiv created 2014/02/25 · arxiv updated 2015/06/18
We give a mini-review of scalar field theories with second-derivative Lagrangians, whose field equations are second order. Some of these theories admit solutions violating the Null Energy Condition and having no obvious pathologies. We give a few examples of using these theories in cosmological setting and also in the context of the creation of a universe in the laboratory.