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$H_0$ Tension on the Light of Supermassive Black Hole Shadows Data | | Celia Escamilla-Rivera
; Rubén Torres Castillejos
; | | Date: |
2 Jan 2023 | | Abstract: | Cosmological tensions in current times have opened a wide door to study new
probes to constrain cosmological parameters, specifically, to determine the
value of the Hubble constant $H_0$ through independent techniques. The two
standard methods to measure/infer $H_0$ rely on: (i) anchored observables for
the distance ladder, and (ii) establishing the relationship of the $H_0$ to the
angular size of the sound horizon in the recombination era assuming a standard
Cosmological Constant Cold Dark Matter ($Lambda$CDM) cosmology. However, the
former requires a calibration with observables at nearby distances, while the
latter is not a direct measurement and is model-dependent. The physics behind
these aspects restrains our possibilities in selecting a calibration method
that can help minimise the systematic effects or in considering a fixed
cosmological model background. Anticipating the possibility of deeply exploring
the physics of new nearby observables such as the recently detected black hole
shadows, in this paper we propose standard rules to extend the studies related
to these observables. Supermassive black hole shadows can be characterised by
two parameters: the angular size of the shadow and the black hole mass. We
found that it is possible to break the degeneracy between these parameters by
forecasting and fixing certain conditions at high(er) redshifts, i.e., instead
of considering the $approx$10\% precision from the EHT array, our results
reach a $approx 4\%$, a precision that could be achievable in experiments in
the near future. | | Source: | arXiv, 2301.00490 | | Services: | Forum | Review | PDF | Favorites | |
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