☆ 4.3 Article

Constant-r geodesics in the Painleve-Gullstrand form of Lense-Thirring spacetime

GENERAL RELATIVITY AND GRAVITATION (2022)

Related references

Note: Only part of the references are listed.

Review Physics, Multidisciplinary

Calculating black hole shadows: Review of analytical studies

Volker Perlick et al.

Summary: This article provides a review of current research on black hole shadows, with a focus on analytical studies. It discusses the definition of the shadow, derivation of angular size, and calculation methods under various conditions. Special attention is given to non-asymptotically flat spacetimes and the influence of plasma on black hole shadows.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2022)

Add to Collection

Article Physics, Particles & Fields

Geodesically complete black holes in Lorentz-violating gravity

Raul Carballo-Rubio et al.

Summary: This paper presents a systematic study of the geometric structure of non-singular spacetimes describing black holes in Lorentz-violating gravity. The concept of trapping horizons and marginally trapped surfaces is reviewed and their significance in frameworks with modified dispersion relations is studied. The notion of universally marginally trapped surfaces is introduced as a generalization for frameworks with infinite signal velocities, leading to the definition of universal trapping horizons. The interplay between the kinematical part of Penrose's singularity theorem and the existence of multiple different metrics is explored, resulting in a complete classification of all possible geometries without incomplete physical trajectories or curvature singularities. The taxonomy of geodesically complete black holes in Horava-like frameworks includes scenarios such as evaporating regular black holes, regular black holes bouncing into regular white holes, and hidden wormholes.

JOURNAL OF HIGH ENERGY PHYSICS (2022)

Add to Collection

Article Astronomy & Astrophysics

Geodesics for the Painleve-Gullstrand Form of Lense-Thirring Spacetime

Joshua Baines et al.

Summary: The authors have investigated a novel Painleve-Gullstrand variant of the slow-rotation Lense-Thirring spacetime, which has elegant features such as unit lapse, flat spatial 3-slices, and a separable Klein-Gordon equation. They have explored the geodesics in detail and found the occurrence of ultra-elliptic integrals. They also discovered that the complete integrability of the geodesics can only be explicitly expressed in terms of elementary functions in certain special cases. This model has significant implications in astrophysics and can be used to study the asymptotic large-distance limit and compare with astronomical observations as a mimic of a black hole.

UNIVERSE (2022)

Add to Collection

Article Astronomy & Astrophysics

Geometric modeling of M87*as a Kerr black hole or a non-Kerr compact object

F. H. Vincent et al.

Summary: Researchers aim to develop a simple analytic disk model for the accretion flow of M87* to predict its image, assuming it is a Kerr black hole or an alternative compact object. They computed synchrotron emission from the disk model and carried out numerical fits to the EHT data, showing that alternatives to the Kerr spacetime may provide similar results and further observations are needed to test the Kerr paradigm conclusively.

ASTRONOMY & ASTROPHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Unit-lapse versions of the Kerr spacetime

Joshua Baines et al.

Summary: The unit-lapse formulations of Kerr spacetime, including the Painleve-Gullstrand form, are strategically important choices for studying the physically crucial but technically challenging Kerr spacetime. Different unit-lapse metrics are useful for examining various geodesics in Kerr spacetime, beyond just the 'rain' geodesics focused on in this article.

CLASSICAL AND QUANTUM GRAVITY (2021)

Add to Collection

Article Astronomy & Astrophysics

Spherical orbits around a Kerr black hole

Edward Teo

Summary: The paper systematically studies spherical orbits around a Kerr black hole, providing simplified forms for parameters, analyzing the parameter space, and delineating characteristics such as stability, boundedness, and direction of motion. Analytic solutions of the geodesic equations are provided, along with illustrative examples of these orbits.

GENERAL RELATIVITY AND GRAVITATION (2021)

Add to Collection

Article Astronomy & Astrophysics

Darboux diagonalization of the spatial 3-metric in Kerr spacetime

Joshua Baines et al.

Summary: The Kerr spacetime is crucial for describing astronomical black holes, but struggles to be compatible with certain geometric properties due to limitations in diagonalization and unit-lapse formulation.

GENERAL RELATIVITY AND GRAVITATION (2021)

Add to Collection

Article Astronomy & Astrophysics

Photon Spheres, ISCOs, and OSCOs: Astrophysical Observables for Regular Black Holes with Asymptotically Minkowski Cores

Thomas Berry et al.

Summary: Researchers have proposed modified spacetimes to mimic the characteristics of black holes without singularities. Recent advances in near-horizon astronomy allow for observational distinctions between black holes and potential mimickers. Physically observable quantities for a recently proposed regular black hole show complex relationships between horizons, photon spheres, and stable orbits, providing rich astrophysical phenomenology.

UNIVERSE (2021)

Add to Collection

Article Astronomy & Astrophysics

On Kerr black hole deformations admitting a Carter constant and an invariant criterion for the separability of the wave equation

Georgios O. Papadopoulos et al.

Summary: In this work, a condition for Kerr deformations to have a separable Klein-Gordon equation is provided, along with the theoretical foundation that the maximum number of free radial functions is three.

GENERAL RELATIVITY AND GRAVITATION (2021)

Add to Collection

Article Astronomy & Astrophysics

A novel family of rotating black hole mimickers

Jacopo Mazza et al.

Summary: With the recent introduction of gravitational wave astronomy, discussion about black hole mimickers has shifted from theoretical to phenomenological. In the absence of a definitive quantum gravity theory, the appeal of using simple metageometries to describe alternative phenomenologically viable scenarios is significant. The metric proposed by Simpson and Visser provides an example of such meta-geometry, allowing for the description of different non-rotating black hole mimickers for varying values of a single parameter.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Killing Tensor and Carter Constant for Painleve-Gullstrand Form of Lense-Thirring Spacetime

Joshua Baines et al.

Summary: The authors have formulated a novel Painleve-Gullstrand variant of the Lense-Thirring spacetime, which has elegant features such as unit-lapse and intrinsically flat spatial 3-slices. It was found that this spacetime possesses a nontrivial Killing tensor, leading to separability of the Hamilton-Jacobi equation and Klein-Gordon equation. However, the 2-form square root of the Killing tensor is not a Killing-Yano tensor, indicating that further study is required in this area.

UNIVERSE (2021)

Add to Collection

Article Astronomy & Astrophysics

Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon

Andrew Chael et al.

Summary: Simulated images of a black hole show a central brightness depression and a photon ring, with the size and shape of the photon ring determined by Kerr geometry and the depth of the observed brightness depression depending on the emission region details. The features of black hole shadow and inner shadow vary in different models.

ASTROPHYSICAL JOURNAL (2021)

Add to Collection

Article Astronomy & Astrophysics

Charged black-bounce spacetimes

Edgardo Franzin et al.

Summary: The recent development of rotating black-bounce-Kerr spacetimes has sparked interest in exploring black-bounce variants of the entire Kerr-Newman family. Specifically focusing on black-bounce-Reissner-Nordstrom and black-bounce-Kerr-Newman spacetimes, researchers have considered their deviation from the Kerr-Newman family in a controlled manner, discussing the existence of Killing tensor and the theoretical impact of non-zero electric charge on astrophysical black holes. Additionally, they have examined the interesting matter/energy content required by the black-bounce-Kerr-Newman solution within the framework of general relativity.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2021)

Add to Collection

Article Astronomy & Astrophysics

Opening the Pandora's box at the core of black holes

Raul Carballo-Rubio et al.

CLASSICAL AND QUANTUM GRAVITY (2020)

Add to Collection

Article Physics, Particles & Fields

When Painleve-Gullstrand coordinates fail

Valerio Faraoni et al.

EUROPEAN PHYSICAL JOURNAL C (2020)

Add to Collection

Editorial Material Astronomy & Astrophysics

Prospects for fundamental physics with LISA

Enrico Barausse et al.

GENERAL RELATIVITY AND GRAVITATION (2020)

Add to Collection

Article Astronomy & Astrophysics

Exact formulas for spherical photon orbits around Kerr black holes

Aydin Tavlayan et al.

PHYSICAL REVIEW D (2020)

Add to Collection

Article Astronomy & Astrophysics

Geodesically complete black holes

Raul Carballo-Rubio et al.

PHYSICAL REVIEW D (2020)

Add to Collection

Article Astronomy & Astrophysics

Innermost and outermost stable circular orbits in the presence of a positive cosmological constant

Petarpa Boonserm et al.

PHYSICAL REVIEW D (2020)

Add to Collection

Review Physics, Particles & Fields

Testing the nature of dark compact objects: a status report

Vitor Cardoso et al.

LIVING REVIEWS IN RELATIVITY (2019)

Add to Collection

Review Physics, Multidisciplinary

Self-force and radiation reaction in general relativity

Leor Barack et al.

REPORTS ON PROGRESS IN PHYSICS (2019)

Add to Collection

Article Astronomy & Astrophysics

Modification of photon trapping orbits as a diagnostic of non-Kerr spacetimes

Kostas Glampedakis et al.

PHYSICAL REVIEW D (2019)

Add to Collection

Article Astronomy & Astrophysics

Testing the rotational nature of the supermassive object M87*from the circularity and size of its first image

Cosimo Bambi et al.

PHYSICAL REVIEW D (2019)

Add to Collection

Article Astronomy & Astrophysics

Black hole shadows, photon rings, and lensing rings

Samuel E. Gralla et al.

PHYSICAL REVIEW D (2019)

Add to Collection

Review Physics, Multidisciplinary

Astrophysical Black Holes: A Compact Pedagogical Review

Cosimo Bambi

ANNALEN DER PHYSIK (2018)

Add to Collection

Article Astronomy & Astrophysics

Preserving Kerr symmetries in deformed spacetimes

Georgios O. Papadopoulos et al.

CLASSICAL AND QUANTUM GRAVITY (2018)

Add to Collection

Article Astronomy & Astrophysics

Phenomenological aspects of black holes beyond general relativity

Raul Carballo-Rubio et al.

PHYSICAL REVIEW D (2018)

Add to Collection

Article Astronomy & Astrophysics

Near-Horizon Geodesics for Astrophysical and Idealised Black Holes: Coordinate Velocity and Coordinate Acceleration

Petarpa Boonserm et al.

UNIVERSE (2018)

Add to Collection

Article Astronomy & Astrophysics

Sgr A* and general relativity

Tim Johannsen

CLASSICAL AND QUANTUM GRAVITY (2016)

Add to Collection

Article Astronomy & Astrophysics

Theoretical physics implications of the binary black-hole mergers GW150914 and GW151226

Nicolas Yunes et al.

PHYSICAL REVIEW D (2016)

Add to Collection

Review Astronomy & Astrophysics

Testing general relativity with present and future astrophysical observations

Emanuele Berti et al.

CLASSICAL AND QUANTUM GRAVITY (2015)

Add to Collection

Article Astronomy & Astrophysics

On the effective metric of a Planck star

Tommaso De Lorenzo et al.

GENERAL RELATIVITY AND GRAVITATION (2015)

Add to Collection

Article Astronomy & Astrophysics

TESTING THE NO-HAIR THEOREM WITH EVENT HORIZON TELESCOPE OBSERVATIONS OF SAGITTARIUS A

Avery E. Broderick et al.

ASTROPHYSICAL JOURNAL (2014)

Add to Collection

Article Astronomy & Astrophysics

Isofrequency pairing of geodesic orbits in Kerr geometry

Niels Warburton et al.

PHYSICAL REVIEW D (2013)

Add to Collection

Article Astronomy & Astrophysics

Spherical null geodesics of rotating Kerr black holes

Shahar Hod

PHYSICS LETTERS B (2013)

Add to Collection

Article Astronomy & Astrophysics

Metric for rapidly spinning black holes suitable for strong-field tests of the no-hair theorem

Tim Johannsen et al.

PHYSICAL REVIEW D (2011)

Add to Collection

Article Astronomy & Astrophysics

Fastest way to circle a black hole

Shahar Hod

PHYSICAL REVIEW D (2011)

Add to Collection

Article Astronomy & Astrophysics

IMAGING THE BLACK HOLE SILHOUETTE OF M87: IMPLICATIONS FOR JET FORMATION AND BLACK HOLE SPIN

Avery E. Broderick et al.

ASTROPHYSICAL JOURNAL (2009)

Add to Collection

Article Education, Scientific Disciplines

The river model of black holes

Andrew J. S. Hamilton et al.

AMERICAN JOURNAL OF PHYSICS (2008)

Add to Collection

Review Astronomy & Astrophysics

From geometry to numerics: interdisciplinary aspects in mathematical and numerical relativity

Jose Luis Jaramillo et al.

CLASSICAL AND QUANTUM GRAVITY (2008)

Add to Collection

Article Astronomy & Astrophysics

Using LISA extreme-mass-ratio inspiral sources to test off-Kerr deviations in the geometry of massive black holes

Leor Barack et al.

PHYSICAL REVIEW D (2007)

Add to Collection

Article Astronomy & Astrophysics

Second order Kerr deflection

A. Edery et al.

GENERAL RELATIVITY AND GRAVITATION (2006)

Add to Collection

Article Physics, Multidisciplinary

Regular phantom black holes

K. A. Bronnikov et al.

PHYSICAL REVIEW LETTERS (2006)

Add to Collection

Article Astronomy & Astrophysics

On the discovery of Birkhoff's theorem

NV Johansen et al.

GENERAL RELATIVITY AND GRAVITATION (2006)

Add to Collection

Article Physics, Multidisciplinary

Formation and evaporation of nonsingular black holes

SA Hayward

PHYSICAL REVIEW LETTERS (2006)

Add to Collection

Article Education, Scientific Disciplines

Schwarzschild and Birkhoff a la Weyl

S Deser et al.

AMERICAN JOURNAL OF PHYSICS (2005)

Add to Collection

Article Physics, Multidisciplinary

Nonexistence of conformally flat slices in Kerr and other stationary spacetimes

JAV Kroon

PHYSICAL REVIEW LETTERS (2004)

Add to Collection

Article Astronomy & Astrophysics

Asymptotic expansions of the Cotton-York tensor on slices of stationary spacetimes

JAV Kroon

CLASSICAL AND QUANTUM GRAVITY (2004)

Add to Collection

Article Education, Scientific Disciplines

Regular coordinate systems for Schwarzschild and other spherical spacetimes

K Martel et al.

AMERICAN JOURNAL OF PHYSICS (2001)

Add to Collection

Article Astronomy & Astrophysics

Regular magnetic black holes and monopoles from nonlinear electrodynamics

KA Bronnikov

PHYSICAL REVIEW D (2001)

Add to Collection

© Peeref 2019-2024. All rights reserved.