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
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
Moises Bravo-Gaete, Maria Montserrat Juarez-Aubry, Gerardo Velazquez Rodriguez
Summary: In this work, we study the existence of asymptotically Lifshitz black holes in four dimensions with a negative cosmological constant. We consider two scenarios, including dilatonic fields and a nonminimally coupled scalar field. We find solutions for specific values of the dynamical exponent, as well as additional solutions in the limiting case. We also study the thermodynamics of these new solutions and find that they satisfy the first law of thermodynamics and the Smarr relation.
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
Astronomy & Astrophysics
Mohammad Bagher Jahani Poshteh, Robert B. Mann
Summary: The thermodynamics of z = 4 Ho.rava-Lifshitz black holes in 3 + 1 dimensions is studied in extended phase space. By using the scaling argument, the Smarr relation and the first law for the black hole solutions of z = 4 Ho.rava-Lifshitz gravity are found. It is discovered that the reverse isoperimetric inequality can be violated for certain types of horizons, leading to positive specific heat at constant pressure and volume. Two critical points are identified for z = 4 Hovara-Lifshitz black holes with hyperbolic horizons, exhibiting both Van der Waals and reverse Van der Waals behaviors.
Article
Astronomy & Astrophysics
Naritaka Oshita, Niayesh Afshordi, Shinji Mukohyama
Summary: This study investigates the ringdown waveform and reflectivity of a Lifshitz scalar field around a fixed Schwarzschild black hole, finding that Lifshitz waves scattered by the black hole exhibit superradiance due to Lorentz breaking terms leading to superluminal propagation. This can allow Lifshitz waves to carry additional positive energy to infinity while leaving negative energy inside the Killing horizon, similar to the Penrose process in Kerr spacetime. The study also observes the emergence of long-lived quasinormal modes and drastic modifications to the greybody factor of a microscopic black hole with Hawking temperature comparable to the Lifshitz energy scale.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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
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
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
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
Physics, Multidisciplinary
Kimet Jusufi, Hassan Hassanabadi, Parisa Sedaghatnia, Jan Kriz, Won Sang Chung, Hao Chen, Zi-Long Zhao, Zheng Wen Long
Summary: The aim of this paper is to generalize the non-relativistic Horava-Lifshitz four-dimensional black hole solution and explore its correspondence with the charged AdS solution in four-dimensional Einstein Gauss-Bonnet theory. The study also investigates the phenomenological aspects of this black hole solution, including entropy, Hawking temperature, free energy, pressure, critical pressure, critical temperature, critical entropy, and horizon properties. The paper examines the changes in the black hole mass over time using Jules Thompson's expansion and calculates the inversion temperature. The optical appearance of the black hole is not significantly altered, but the shadow radius increases with the parameter w and decreases with the electric charge.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
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
Physics, Multidisciplinary
Behnam Pourhassan, Izzet Sakalli
Summary: This paper investigates the thermodynamics of the Horava-Lifshitz black hole at quantum scales, focusing on the non-perturbative quantum correction. The study reveals that the stability of different solutions, such as Kehagius-Sfetsos and Lu-Mei-Pop, is affected differently by the non-perturbative quantum correction. The Lu-Mei-Pop solution remains stable in the presence of the correction.
CHINESE JOURNAL OF PHYSICS
(2022)
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
Physics, Mathematical
Surajit Chattopadhyay, Antonio Pasqua, Irina Radinschi, Aroonkumar Beesham
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2018)
Article
Physics, Particles & Fields
Susmita Sarkar, Farook Rahaman, Irina Radinschi, Theophanes Grammenos, Joydeep Chakraborty
ADVANCES IN HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Irina Radinschi, Theophanes Grammenos, Farook Rahaman, Andromahi Spanou, Marius Mihai Cazacu, Surajit Chattopadhyay, Antonio Pasqua
ADVANCES IN HIGH ENERGY PHYSICS
(2018)
Editorial Material
Physics, Particles & Fields
Irina Radinschi, Farook Rahaman, Theophanes Grammenos, Saibal Ray, I-Ching Yang
ADVANCES IN HIGH ENERGY PHYSICS
(2019)
Article
Physics, Multidisciplinary
Sthiti Chakrabarti, Surajit Chattopadhyay, Irina Radinschi
CANADIAN JOURNAL OF PHYSICS
(2020)
Article
Physics, Mathematical
Swati Sinha, Surajit Chattopadhyay, Irina Radinschi
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2019)
Article
Environmental Sciences
Iulian-Alin Rosu, Silvia Ferrarese, Irina Radinschi, Vasilica Ciocan, Marius-Mihai Cazacu
Article
Astronomy & Astrophysics
Soumyodipta Karmakar, Surajit Chattopadhyay, Irina Radinschi
Article
Astronomy & Astrophysics
Irina Radinschi, Pradyumn Kumar Sahoo, Theophanes Grammenos, Surajit Chattopadhyay, Marius-Mihai Cazacu
Article
Astronomy & Astrophysics
Irina Radinschi, Theophanes Grammenos, Farook Rahaman, Marius-Mihai Cazacu, Andromahi Spanou, Joydeep Chakraborty
Article
Art
Marius Mihai Cazacu, Vasile Pelin, Irina Radinschi, Ion Sandu, Vasilica Ciocan, Ioan Gabriel Sandu, Silviu Gurlui
INTERNATIONAL JOURNAL OF CONSERVATION SCIENCE
(2020)
Article
Physics, Multidisciplinary
P. K. Sahoo, I. Radinschi, K. L. Mahanta
INDIAN JOURNAL OF PHYSICS
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
V. Pelin, O. Rusu, M. M. Cazacu, S. Gurlui, A. V. Sandu, I. Radinschi, V. Ciocan, I. Sandu
EUROINVENT ICIR 2018
(2018)
Article
Computer Science, Interdisciplinary Applications
Irina Radinschi, Vladut Fratiman, Vasilica Ciocan, Marius-Mihai Cazacu
COMPUTER APPLICATIONS IN ENGINEERING EDUCATION
(2017)
Proceedings Paper
Education & Educational Research
Gabriela Covatariu, Marius-Mihai Cazacu, Irina Radinschi, Vasilica Ciocan, Vladut Fratiman, Florin Emilian Turcanu
9TH INTERNATIONAL CONFERENCE ON EDUCATION AND NEW LEARNING TECHNOLOGIES (EDULEARN17)
(2017)
