Implications of axionic hair on shadow of M87*

Abstract

Detection of axion field can unfold intriguing facets of our universe in several astrophysical and cosmological scenarios. In four dimensions, such a field owes its origin to the completely anti-symmetric Kalb-Ramond field strength tensor. Its invisibility in the solar system based tests compels one to look for its signatures in the strong field regime. The recent observation of the shadow of the supermassive black hole in the galaxy M87 ushers in a new opportunity to test for the footprints of axion in the near horizon region of black holes, where the gravity is expected to be strong. In this paper, we explore the impact of axion on the black hole shadow and compare the result with the available image of M87*. Our analysis indicates that axion which violates the energy condition seems to be favored by observations. The implications are discussed.

arXiv comment20 pages, 6 figures

References in corpus (64)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• A Large Mass Hierarchy from a Small Extra Dimension
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Modified Gravity and Cosmology
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• First M87 Event Horizon Telescope Results. II. Array and Instrumentation
• First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
• Cosmological Signature of New Parity-Violating Interactions
• Black Hole Shadows, Photon Rings, and Lensing Rings
• Shadows and strong gravitational lensing: a brief review
• The ACS Fornax Cluster Survey. V. Measurement and Recalibration of Surface Brightness Fluctuations and a Precise Value of the Fornax--Virgo Relative Distance
• Testing the rotational nature of the supermassive object M87* from the circularity and size of its first image
• Rotating Charged Black Hole Solution in Heterotic String Theory
• The Black-Hole Mass in M87 from Gemini/NIFS Adaptive Optics Observations
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• Testing General Relativity in Cosmology
• Shadow of rotating regular black holes
• Hunting for extra dimensions in the shadow of M87*
• The M87 Black Hole Mass from Gas-dynamical Models of Space Telescope Imaging Spectrograph Observations
• The Current Ability to Test Theories of Gravity with Black Hole Shadows
• A coordinate-independent characterization of a black hole shadow
• Ultra Light Boson Dark Matter and Event Horizon Telescope Observations of M87*
• Silhouette of M87*: A new window to peek into the world of hidden dimensions
• The Raychaudhuri equations: a brief review
• Topological Invariants, Instantons and Chiral Anomaly on Spaces with Torsion
• Twistor spaces for HKT manifolds
• A Precise Distance to the Host Galaxy of the Binary Neutron Star Merger GW170817 Using Surface Brightness Fluctuations
• Probing Axions with Event Horizon Telescope Polarimetric Measurements
• The Inner Halo of M87: A First Direct View of the Red-Giant Population
• Does the black hole shadow probe the event horizon geometry?
• Parity Violating Gravitational Coupling Of Electromagnetic Fields
• Does a Randall-Sundrum scenario create the illusion of a torsion-free universe?
• The inflationary universe in F(R) gravity with antisymmetric tensor fields and their suppression during the universe evolution
• Static spherisymmetric solutions, gravitational lensing and perihelion precession in Einstein--Kalb--Ramond theory
• Does a Kalb-Ramond field make spacetime optically active
• Cosmic optical activity from an inhomogeneous Kalb-Ramond field
• Evolution of black hole shadow in the presence of ultralight bosons
• Logarithmic-corrected $R^2$ Gravity Inflation in the Presence of Kalb-Ramond Fields
• Anomalous Majorana Neutrino Masses from Torsionful Quantum Gravity
• Parity-violating Kalb-Ramond-Maxwell interactions and CMB anisotropy in a braneworld
• Spherically Symmetric Solutions of Gravitational Field Equations in Kalb-Ramond Background
• Environmental CPT Violation in an Expanding Universe in String Theory
• Excavating black hole continuum spectrum: Possible signatures of scalar hairs and of higher dimensions
• Decoding signatures of extra dimensions and estimating spin of quasars from the continuum spectrum
• Fermion helicity flip by parity violating torsion
• Bouncing cosmology from Kalb-Ramond Braneworld
• Torsion Effects in Braneworld Scenarios
• Solutions on a brane in a bulk spacetime with Kalb-Ramond field
• Why has spacetime torsion such negligible effect on our universe?
• Packing extra mass in compact stellar structures: An interplay between Kalb-Ramond field and extra dimensions
• Bulk torsion fields in theories with large extra dimensions
• Does black hole continuum spectrum signal f(R) gravity in higher dimensions?
• Invariant Connections with Torsion on Group Manifolds and Their Application in Kaluza-Klein Theories
• Invisibility of antisymmetric tensor fields in the light of $F(R)$ gravity
• Weakly dynamic dark energy via metric-scalar couplings with torsion
• Dynamical suppression of spacetime torsion
• The shadow of dark matter as a shadow of string theory
• Test of Kerr-Sen metric with black hole observations
• In quest of axionic hairs in quasars
• Penrose process in charged axion-dilaton coupled black hole
• Scalaron tunneling and the fate of antisymmetric tensor fields in $F(R)$ gravity

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• Parameters estimation and strong gravitational lensing of nonsingular Kerr-Sen black holes
• Shadows of black hole surrounded by anisotropic fluid in Rastall theory
• Rotating Black Holes in Horndeski Gravity: Thermodynamic and Gravitational Lensing
• Event Horizon Telescope observations exclude compact objects in baseline mimetic gravity
• Quasinormal modes-shadow correspondence for rotating regular black holes
• The shadow of M87* black hole within rational nonlinear electrodynamics
• Primordial regular black holes as all the dark matter. II. Non-time-radial-symmetric and loop quantum gravity-inspired metrics
• Primordial regular black holes as all the dark matter. I. Time-radial-symmetric metrics
• Imprints of the Janis-Newman-Winicour spacetime on observations related to shadow and accretion
• Thin accretion discs around spherically symmetric configurations with nonlinear scalar fields
• Polarimetric signatures of the photon ring of a black hole that is pierced by a cosmic axion string
• Gravitational wave in f(R) gravity: possible signature of sub- and super-Chandrasekhar limiting mass white dwarfs
• Shadows in dyonic Kerr-Sen black holes
• Qualifying ringdown and shadow of black holes under general parametrized metrics with photon orbits
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• Primordial regular black holes as all the dark matter. III. Covariant canonical quantum gravity models
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