Article
Physics, Particles & Fields
Alvaro Restuccia, Francisco Tello-Ortiz
Summary: This study obtained and analyzed a spherically symmetric solution of the field equations of the Horava-Lifshitz gravity-gauge vector interaction theory, describing a charged throat. The solution exists when a restriction on the relation between mass and charge is met, reducing to the Reissner-Nordstrom one as the coupling constants approach relativistic values. By introducing the correct charts, the solution can be described across the entire manifold, including the throat connecting different spacetimes.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Jan Ambjorn, Yuki Hiraga, Yoshiyasu Ito, Yuki Sato
Summary: By quantizing the two-dimensional projectable Horava-Lifshitz gravity with bi-local and spacelike wormhole interaction, we find that the resulting quantum Hamiltonian coincides with that obtained through summing over all genus in the string field theory, implying that the wormhole interaction can be interpreted as a splitting or joining interaction of one-dimensional strings.
Article
Physics, Mathematical
Abdul Jawad, Shamaila Rani, Sameen Ashraf, Nadeem Azhar
Summary: We discuss the cosmological implications of the interacting Barrow holographic dark energy model in the context of flat deformed Horava-Lifshitz gravity by assuming the interaction between dark energy and pressureless dark matter. We investigate the evolutionary history of cosmological parameters and find results that favor observational data of Planck 2018. Moreover, we examine the generalized second law of thermodynamics of this cosmological system with barrow entropy as horizon entropy and observe that this law holds for both horizons.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Hiroki Matsui, Shinji Mukohyama, Atsushi Naruko
Summary: The study shows that in many gravitational theories, the DeWitt wave function does not have the desired form when tensor perturbations are taken into account, but Hofava-Lifshitz gravity provides a satisfactory solution, especially an exact analytic expression for the DeWitt wave function of the universe with scale-invariant perturbations can be found in the limit of z = 3 anisotropic scaling.
Article
Astronomy & Astrophysics
Paul Martens, Hiroki Matsui, Shinji Mukohyama
Summary: In this paper, we introduce a well-tempered DeWitt wave function that vanishes at the classical big-bang singularity in Horava-Lifshitz (HL) cosmology. Through analytical and numerical methods, we demonstrate that in HL gravity, the DeWitt wave function for tensor perturbation is well-defined at the singularity and behaves well up to the finite size of the Universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
G. S. Vicente
Summary: This study considers classical and quantum Friedmann-Lemaitre-Robertson-Walker universes filled with noninteracting radiation and dust fluids within the framework of Horava-Lifshitz gravity theory. Analytical solutions for nonsingular quantum bounce and cyclic universes for open and closed spatial sections in terms of the parameters of Horava-Lifshitz theory were found. The Horava-Lifshitz theory was applied in its projectable version without the detailed balance condition, and canonical quantization was performed in the Wheeler-DeWitt approach of quantum cosmology for a minisuperspace model.
Article
Astronomy & Astrophysics
Guillermo Lara, Mario Herrero-Valea, Enrico Barausse, Sergey M. Sibiryakov
Summary: Horava gravity proposes completing general relativity by interactions violating Lorentz invariance at high energies, with solutions showing various geometric properties and uncertainty regarding their formation from gravitational collapse.
Article
Astronomy & Astrophysics
Celia Escamilla-Rivera, Hernando Quevedo
Summary: Proposing an alternative cosmography using Horava-Lifshitz gravity as a model for quantum gravity, the study suggests that the Universe appears flat classically according to the ΛCDM model, but is actually curved from a quantum perspective. The findings indicate a non-flat scenario and a specific value for the Horava parameter that could be interpreted as a measure of a quantum effect.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Ewa Czuchry
Summary: The standard ΛCDM model has unresolved issues like the initial singularity, which require modifications to general relativity. However, the Horava-Lifshitz theory offers an alternative with a bounce of the universe instead of an initial singularity. This review discusses previous works on the stability of this bounce in different formulations of the HL theory.
Article
Astronomy & Astrophysics
Hugo Garcia-Compean, Daniel Mata-Pacheco
Summary: This study investigates the vacuum transition probabilities for a Friedmann-Lemaitre-Robertson-Walker universe with positive curvature in Horava-Lifshitz gravity, considering the presence of a scalar field potential. The Hamiltonian approach to the Wheeler-DeWitt equation is used to compute the transition probabilities. The study provides analytic expressions for the transition probabilities in two scenarios and discusses the infrared and ultraviolet limits in comparison to general relativity. Phenomenological implications, including a potential resolution of the initial singularity, are briefly discussed.
Article
Multidisciplinary Sciences
Abdul Jawad, Abdul Malik Sultan, Shamaila Rani
Summary: In this study, the matter-antimatter imbalance in the universe is investigated through baryogenesis, which is a physical process occurring after the big bang and resulting in an excess of matter over antimatter. The reproduction of the baryon to entropy ratio in the presence of modified Ho.rava-Lifshitz gravity is examined, considering different baryogenesis interactions proportional to (R) over tilde. Two models are analyzed with different values of F((R) over tilde). The results show that the matter-antimatter asymmetry is not eliminated by the modified gravity theory, indicating a consistent gravitational baryogenesis with recent observational data.
Article
Astronomy & Astrophysics
Alvaro Restuccia, Francisco Tello-Ortiz
Summary: An anisotropic model describing gravity-vector gauge coupling is proposed, based on the 4+1 dimensional non-projectable Ho.rava-Lifshitz gravity theory with a geometrical restriction. Renormalizability arguments require including interactions up to terms with z = 4 spatial derivatives on the geometrical tensor fields. The reduction to 3+1 dimensions results in a model invariant under FDiff and U(1) symmetry groups, propagating the same spectrum as the Einstein-Maxwell theory at the kinetic conformal point.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Kyungmin Kim, John J. Oh, Chan Park, Edwin J. Son
Summary: The study revealed that neutron stars (NSs) with larger radii and heavier masses in Ho.rava-Lifshitz (HL) gravity remain stable without collapsing into black holes, showing a deviation from general relativity (GR) can change the typical features of NS structure.
Article
Astronomy & Astrophysics
Alessandro Casalino, Lorenzo Sebastiani
Summary: This paper investigates the perturbation theory of Regularized Lovelock Gravity on curved FLRW spacetime, deriving a general expression for the velocity of gravitational waves. Application of the theory to slow-roll inflation on flat FLRW background yields power spectra of scalar and tensor perturbations, and equations for inflation observable quantities.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Siddarth Ajith, Kent Yagi, Nicolas Yunes
Summary: This paper investigates the possibility of constraining the coupling constant lambda in Horava-Lifshitz gravity theory through neutron star observations. By constructing slowly-rotating and weakly tidally-deformed neutron stars and analyzing the results, it is found that the moment of inertia of neutron stars is independent of lambda, while tidal deformations are affected by khronometric gravity.
