caa a22 4500 467911215 CHVBK 20180406152849.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s11232-006-0149-7 doi (NATIONALLICENCE)springer-10.1007/s11232-006-0149-7 Rubakov V. Institute for Nuclear Research, RAS, Moscow, Russia aut Phantom without pathologies in the ultraviolet domain [Elektronische Daten] [V. Rubakov] We present a simple model in which the weak energy condition is violated for spatially homogeneous, slowly evolving fields. The excitations in Minkowski space in an external field with violation of the Lorentz invariance do not contain ghosts, tachyons, or superluminal modes at spatial momenta ranging from some low scale ε to the ultraviolet cutoff scale, while tachyons and possibly ghosts do exist for three-dimensional momenta less than ε. We show that in the absence of other matter, a slow-roll cosmological regime is possible. In this regime, the weak energy condition is violated, and yet homogeneity and isotropy are not completely spoiled (at the cost of fine tuning), because for a given conformal momentum, the tachyon mode increases during a sufficiently short time. Springer Science+Business Media, Inc., 2006 Lorentz invariance nationallicence vector field nationallicence cosmological expansion nationallicence weak energy condition nationallicence Theoretical and Mathematical Physics Kluwer Academic Publishers-Consultants Bureau 149/3(2006-12-01), 1651-1664 0040-5779 149:3<1651 2006 149 11232 https://doi.org/10.1007/s11232-006-0149-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11232-006-0149-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Rubakov V. Institute for Nuclear Research, RAS, Moscow, Russia aut NATIONALLICENCE 773 0- Theoretical and Mathematical Physics Kluwer Academic Publishers-Consultants Bureau 149/3(2006-12-01), 1651-1664 0040-5779 149:3<1651 2006 149 11232 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer