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arXiv · 2004.13123

Power-law Genesis: strong coupling and galileon-like vector fields

P. K. Petrov
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Abstract

A simple way to construct models with early cosmological Genesis epoch is to employ bosonic fields whose Lagrangians transform homogeneously under scaling transformation. We show that in these theories, for a range of parameters defining the Lagrangian, there exists a homogeneous power-law solution in flat space-time, whose energy density vanishes, while pressure is negative (power-law Genesis). We find the condition for the legitimacy of the classical field theory description of such a situation. We note that this condition does not hold for our earlier Genesis model with vector field. We construct another model with vector field and power-law background solution in flat space-time, which is legitimately treated within classical field theory, violates the NEC and is stable. Upon turning on gravity, this model describes the early Genesis stage.

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P. K. Petrov. 2020-04-27. Power-law Genesis: strong coupling and galileon-like vector fields. https://doi.org/10.1142/s0217732320503058

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