22 research outputs found
A Non-Relativistic Weyl Anomaly
We examine the Weyl anomaly for a four-dimensional z=3 Lifshitz scalar
coupled to Horava's theory of anisotropic gravity. We find a one-loop
break-down of scale-invariance at second order in the gravitational background.Comment: LaTeX, 23 pages, no figures, JHEP style; v2: typos fixed to match the
published versio
Susceptibility amplitude ratio for generic competing systems
We calculate the susceptibility amplitude ratio near a generic higher
character Lifshitz point up to one-loop order. We employ a renormalization
group treatment with independent scaling transformations associated to the
various inequivalent subspaces in the anisotropic case in order to compute the
ratio above and below the critical temperature and demonstrate its
universality. Furthermore, the isotropic results with only one type of
competition axes have also been shown to be universal. We describe how the
simpler situations of -axial Lifshitz points as well as ordinary
(noncompeting) systems can be retrieved from the present framework.Comment: 20 pages, no figure
Thermodynamics and classification of cosmological models in the Horava-Lifshitz theory of gravity
We study thermodynamics of cosmological models in the Horava-Lifshitz theory
of gravity, and systematically investigate the evolution of the universe filled
with a perfect fluid that has the equation of state , where and
denote, respectively, the pressure and energy density of the fluid, and
is an arbitrary real constant. Depending on specific values of the free
parameters involved in the models, we classify all of them into various cases.
In each case the main properties of the evolution are studied in detail,
including the periods of deceleration and/or acceleration, and the existence of
big bang, big crunch, and big rip singularities. We pay particular attention on
models that may give rise to a bouncing universe.Comment: revtex4, 21 figures. New references added & some changes made in
Introduction. Version to appear in JCA