Constraining the Cardoso-Pani-Rico metric with future observations of SgrA${}^{\ast }$

Abstract

SgrA${}^{\ast }$, the supermassive black hole candidate at the center of our Galaxy, seems to be one of the most promising object to test the Kerr black hole hypothesis with near future observations. In a few years, it will hopefully be possible to measure a number of relativistic effects around this body, and the combination of different observations can be used to constrain possible deviations from the Kerr solution. In this paper, I discuss the combination of three promising techniques in the framework of the Cardoso-Pani-Rico parametrization: the observation of blobs of plasma orbiting near the innermost stable circular orbit, the detection of the black hole shadow, and timing observations of a radio pulsar in a compact orbit. The observations of blobs of plasma and of the shadow can probe the strong gravitational field around SgrA${}^{\ast }$, while the radio pulsar would be sensitive to the weak field region at larger radii. In the case of a fast-rotating object, the combination of the three measurements could provide strong constraints on the actual nature of SgrA${}^{\ast }$. For a non-rotating or slow-rotating object, the bounds would be weak.

arXiv comment8 pages, 3 figures. v2: refereed version

References in corpus (43)

• The Confrontation between General Relativity and Experiment
• Viewing the Shadow of the Black Hole at the Galactic Center
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• Measurement of the Kerr Spin Parameter by Observation of a Compact Object's Shadow
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• Magnetically Driven Accretion Flows in the Kerr Metric I: Models and Overall Structure
• Apparent shape of super-spinning black holes
• Shadow of a rotating braneworld black hole
• Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
• Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
• Shadow of a Kaluza-Klein rotating dilaton black hole
• Constraining the spin and the deformation parameters from the black hole shadow
• Dynamical Constraints On Alternatives To Massive Black Holes In Galactic Nuclei
• Testing Properties of the Galactic Center Black Hole Using Stellar Orbits
• Prospects for Probing the Spacetime of Sgr A* with Pulsars
• Constraining the quadrupole moment of stellar-mass black-hole candidates with the continuum fitting method
• Optical phenomena in brany Kerr spacetimes
• Appearance of Keplerian discs orbiting Kerr superspinars
• Orbital resonances in discs around braneworld Kerr black holes
• A code to compute the emission of thin accretion disks in non-Kerr space-times and test the nature of black hole candidates
• Shape and position of the shadow in the $\delta =2$ Tomimatsu-Sato space-time
• Kerr Black Holes are Not Unique to General Relativity
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. III. Quasi-Periodic Variability
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. IV. Relativistically Broadened Iron Lines
• A polarised infrared flare from Sagittarius A* and the signatures of orbiting plasma hotspots
• Probing the space-time geometry around black hole candidates with the resonance models for high-frequency QPOs and comparison with the continuum-fitting method
• Constraints on the spacetime geometry around 10 stellar-mass black hole candidates from the disk's thermal spectrum
• On generic parametrizations of spinning black-hole geometries
• Testing the Kerr black hole hypothesis
• Light Curves from an MHD Simulation of a Black Hole Accretion Disk
• Testing the Kerr-nature of stellar-mass black hole candidates by combining the continuum-fitting method and the power estimate of transient ballistic jets
• Broad K$\alpha$ iron line from accretion disks around traversable wormholes
• A High-Frequency Search for Pulsars Within the Central Parsec of SgrA*
• K$\alpha$ iron line profile from accretion disks around regular and singular exotic compact objects
• Distinguishing black holes and wormholes with orbiting hot spots
• Concurrent X-ray, near-infrared, sub-millimeter, and GeV gamma-ray observations of Sgr A*
• Measuring the Kerr spin parameter of a non-Kerr compact object with the continuum-fitting and the iron line methods
• Direct imaging rapidly-rotating non-Kerr black holes
• Attempt to find a correlation between the spin of stellar-mass black hole candidates and the power of steady jets: relaxing the Kerr black hole hypothesis
• Testing the space-time geometry around black hole candidates with the available radio and X-ray data
• Testing the nature of the supermassive black hole candidate in SgrA* with light curves and images of hot spots
• Performance of astrometric detection of a hotspot orbiting on the innermost stable circular orbit of the galactic centre black hole
• Note on the Cardoso-Pani-Rico parametrization to test the Kerr black hole hypothesis

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• Testing General Relativity with Present and Future Astrophysical Observations
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• Axion-plasmon or magnetized plasma effect on an observable shadow and gravitational lensing of a Schwarzschild black hole
• Black hole and cosmos with multiple horizons and multiple singularities in vector-tensor theories
• Silhouette and spectral line profiles in the special modification of the Kerr black hole geometry generated by quintessential fields
• Circular motion of particle around Schwarzschild-MOG black hole
• Scattering of particles by deformed non-rotating black holes