Galaxy Rotation Curves in Covariant Hořava-Lifshitz Gravity

Alexandre, Jean; Kostacinska, Martyna

doi:10.3390/galaxies2010001

Cited by 4 publications

(3 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though dark matter is by far the most accepted explanation for the resolution to the galaxy rotation problem, there have been other proposals with varying degrees of success. Among them, the most popular ones involve certain modification of the laws of gravity, starting with the seminal works [94,95] and continuing with a large body of work that includes [96,97,98,99,100,101,102,103,104,105,106] and the recent additions [107,108,109,110,111,112].…”

Section: Rotation Curvesmentioning

confidence: 99%

Anisotropic models for globular clusters, Galactic bulges, and dark halos

Nguyen¹,

Pedraza²

2013

Phys. Rev. D

View full text Add to dashboard Cite

Spherical systems with polytropic equations of state are of great interest in astrophysics. They are widely used to describe neutron stars, red giants, white dwarfs, brown dwarfs, main sequence stars, galactic halos, and globular clusters of diverse sizes. In this paper we construct analytically a family of self-gravitating spherical models in the post-Newtonian approximation of general relativity. These models present interesting cusps in their density profiles which are appropriate for the modeling of galaxies and dark matter halos. The systems described here are anisotropic in the sense that their equiprobability surfaces in velocity space are nonspherical, leading to an overabundance of radial or circular orbits, depending on the parameters of the model under consideration. Among the family of models, we find the post-Newtonian generalization of the Plummer and Hernquist models. A close inspection of their equation of state reveals that these solutions interpolate smoothly between a polytropic sphere in the asymptotic region and an inner core that resembles an isothermal sphere. Finally, we study the thermodynamics of these models and argue for their stability. 1

show abstract

Section: Rotation Curvesmentioning

confidence: 99%

Anisotropic models for globular clusters, Galactic bulges, and dark halos

Nguyen¹,

Pedraza²

2013

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…This covariant extension to HL has led to several studies, including spherically symmetric solutions [6] and their relevance to an alternative model for galaxy rotation curves [7], cosmological solutions [8], as well as theoretical and phenomenological consistency tests of the theory [9].…”

Section: Introductionmentioning

confidence: 99%

Effective matter dispersion relation in quantum covariant Horava-Lifshitz gravity

Alexandre

Brister

2015

Phys. Rev. D

View full text Add to dashboard Cite

We study how quantum fluctuations of the metric in covariant Hořava-Lifshitz gravity influence the propagation of classical fields (complex scalar and photon). The effective Lorentz-symmetry violation induced by the breaking of 4-dimensional diffeomorphism is then evaluated, by comparing the dressed dispersion relations for both external fields. The constraint of vanishing 3-dimensional Ricci scalar is imposed in the path integral, which therefore explicitly depends on two propagating gravitational degrees of freedom only. Because the matter fields are classical, the present model contains only logarithmic divergences. Furthermore, it imposes the characteristic Hořava-Lifshitz scale to be smaller than 10 10 GeV, if one wishes not to violate the current bounds on Lorentz symmetry violation.

show abstract

“…Spherically symmetric static spacetimes in the framework of the HL theory with U(1) symmetry with or without the projectabilty condition are studied systematically in [26,27,29,35,36,47,48]. In particular, the ADM variables for spherically symmetric spacetimes with the projectability condition take the forms…”

Section: Spherical Spacetimes Filled With a Fluidmentioning

confidence: 99%

Gravitational collapse in Hořava-Lifshitz theory

et al. 2013

View full text Add to dashboard Cite

We study gravitational collapse of a spherical fluid in nonrelativistic general covariant theory of the Hořava-Lifshitz gravity with the projectability condition and an arbitrary coupling constant λ, where |λ − 1| characterizes the deviation of the theory from general relativity in the infrared limit. The junction conditions across the surface of a collapsing star are derived under the (minimal) assumption that the junctions be mathematically meaningful in terms of distribution theory. When the collapsing star is made of a homogeneous and isotropic perfect fluid, and the external region is described by a stationary spacetime, the problem reduces to the matching of six independent conditions. If the perfect fluid is pressureless (a dust fluid), it is found that the matching is also possible. In particular, in the case λ = 1, the external spacetime is described by the Schwarzschild (anti-) de Sitter solution written in Painlevé-Gullstrand coordinates. In the case λ = 1, the external spacetime is static but not asymptotically flat. Our treatment can be easily generalized to other versions of Hořava-Lifshitz gravity or, more generally, to any theory of higher-order derivative gravity.PACS numbers: 98.80.Cq; 98.80.Bp

show abstract

Galaxy Rotation Curves in Covariant Hořava-Lifshitz Gravity

Cited by 4 publications

References 62 publications

Anisotropic models for globular clusters, Galactic bulges, and dark halos

Anisotropic models for globular clusters, Galactic bulges, and dark halos

Effective matter dispersion relation in quantum covariant Horava-Lifshitz gravity

Gravitational collapse in Hořava-Lifshitz theory

Contact Info

Product

Resources

About