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.
No takes yet. Share an insight, caveat, or question.
Валерий Анатольевич Рубаков (2014) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: