A No-Go Theorem for Rotating Stars of a Perfect Fluid without Radial Motion in Projectable Hořava–Lifshitz Gravity
نویسندگان
چکیده
منابع مشابه
A No-Go Theorem for Rotating Stars of a Perfect Fluid without Radial Motion in Projectable Horava–Lifshitz Gravity
Hořava–Lifshitz gravity has covariance only under the foliation-preserving diffeomorphism. This implies that the quantities on the constant-time hypersurfaces should be regular. In the original theory, the projectability condition, which strongly restricts the lapse function, is proposed. We assume that a star is filled with a perfect fluid with no-radial motion and that it has reflection symme...
متن کاملA rotating incompressible perfect fluid space - time
A rigidly rotating incompressible perfect fluid solution of Einstein’s gravitational equations is given. The Petrov type is D, and the metric admits a fourparameter isometry group. The Gaussian curvature of the instantaneous constantpressure surfaces is positive and they have two ring-shaped cusps. PACS numbers: 04.20.Cv, 04.20.Jb, 04.40.Dg, 97.60.-s Submitted to: Class. Quantum Grav. Rotating ...
متن کاملA no-go theorem for polytropic spheres in Palatini f(R) gravity
Non-vacuum static spherically-symmetric solutions in Palatini f(R) gravity are examined. It is shown that for generic choices of f(R), there are commonly-used equations of state for which no satisfactory physical solution of the field equations can be found within this framework, apart from in the special case of General Relativity, casting doubt on whether Palatini f(R) gravity can be consider...
متن کاملA No-Go Theorem in String Cosmology
A no-go theorem pertaining to the graceful exit problem in Pre-Big-Bang in ation is reviewed. It is shown that dilaton self-interactions and string uid sources fail to facilitate branch changing necessary to avoid singularities. A comment on the failure of the higher genus corrections to induce graceful exit is also included. Contributed talk at the 6 Canadian Conference on General Relativity a...
متن کاملA no-go theorem for direct collapse black holes without a strong ultraviolet background
Explaining the existence of supermassive black holes larger than ∼109 M at redshifts z 6 remains an open theoretical question. One possibility is that gas collapsing rapidly in pristine atomic cooling haloes (Tvir 104 K) produces 104–106 M black holes. Previous studies have shown that the formation of such a black hole requires a strong UV background to prevent molecular hydrogen cooling and ga...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Galaxies
سال: 2013
ISSN: 2075-4434
DOI: 10.3390/galaxies1030261