9 research outputs found
k-Essence, superluminal propagation, causality and emergent geometry
Full text linkThe k-essence theories admit in general the superluminal propagation of the
perturbations on classical backgrounds. We show that in spite of the
superluminal propagation the causal paradoxes do not arise in these theories
and in this respect they are not less safe than General Relativity.Comment: 34 pages, 5 figure
On regularity of a boundary point for higher-order parabolic equations: towards Petrovskii-type criterion by blow-up approach
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