A New Measurement of the Hubble Constant and Matter Content of the Universe Using Extragalactic Background Light γ-Ray Attenuation

Domínguez, A.; Wojtak, Radosław; Finke, J.; Ajello, M.; Helgason, Kari; Prada, Francisco; Desai, Abhishek; Paliya, Vaidehi S.; Marcotulli, L.; Hartmann, D. H.

doi:10.3847/1538-4357/ab4a0e

Cited by 101 publications

(75 citation statements)

References 88 publications

(87 reference statements)

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“…Complementary constraints of cosmological parameters, such as H 0 and Ω M , can also be expected from this observation program. The γ-ray optical depth is to first order proportional to the EBL density and inversely proportional to H 0 [15,[80][81][82][83]. As a result, for an EBL spectrum fixed to the level expected from galaxy counts, the uncertainty on H 0 is at least as great as the uncertainty on the scale factor α.…”

Section: Determination Of the Optical Depthmentioning

confidence: 98%

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Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

Martínez¹,

Larriva²,

Barrio³

et al. 2021

J. Cosmol. Astropart. Phys.

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The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.

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Section: Determination Of the Optical Depthmentioning

confidence: 98%

“…These results will also enable an estimation of the cosmic star-formation history (see Refs. [22,202]) and enable an independent determination of cosmological parameters [83]. Sensitivity studies dedicated to these more specific topics shall be conducted in the future.…”

Section: Perspectives On Cta Constraints Of γ-Ray Propagationmentioning

confidence: 99%

Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

Martínez¹,

Larriva²,

Barrio³

et al. 2021

J. Cosmol. Astropart. Phys.

Self Cite

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“…Our Abbott et al 2018) are shown at the bottom. The next is an estimate using extragalactic background light γ ray attenuation (Domínguez et al 2019) and another from BAO at all redshifts + BBN estimate (Cuceu et al 2019). Then we show measurements from SNe Ia calibrated with TRGB (Freedman et al 2019), SNe Ia calibrated with Cepheids (SH0ES sample, Riess et al 2016Riess et al , 2019, using near-infrared (NIR) filters (Burns et al 2018) and SNe Ia with Mira variables (Huang et al 2020).…”

Section: Hubble Tensionmentioning

confidence: 99%

A new measurement of the Hubble constant using Type Ia supernovae calibrated with surface brightness fluctuations

Khetan

Izzo

Branchesi

et al. 2021

A&A

123

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We present a new calibration of the peak absolute magnitude of Type Ia supernovae (SNe Ia) based on the surface brightness fluctuations (SBF) method, aimed at measuring the value of the Hubble constant. We build a sample of calibrating anchors consisting of 24 SNe hosted in galaxies that have SBF distance measurements. Applying a hierarchical Bayesian approach, we calibrate the SN Ia peak luminosity and extend the Hubble diagram into the Hubble flow by using a sample of 96 SNe Ia in the redshift range 0.02 < z < 0.075, which was extracted from the Combined Pantheon Sample. We estimate a value of H0 = 70.50 ± 2.37 (stat.) ± 3.38 (sys.) km s−1 Mpc−1 (i.e., 3.4% stat., 4.8% sys.), which is in agreement with the value obtained using the tip of the red giant branch calibration. It is also consistent, within errors, with the value obtained from SNe Ia calibrated with Cepheids or the value inferred from the analysis of the cosmic microwave background. We find that the SNe Ia distance moduli calibrated with SBF are on average larger by 0.07 mag than those calibrated with Cepheids. Our results point to possible differences among SNe in different types of galaxies, which could originate from different local environments and/or progenitor properties of SNe Ia. Sampling different host galaxy types, SBF offers a complementary approach to using Cepheids, which is important in addressing possible systematics. As the SBF method has the ability to reach larger distances than Cepheids, the impending entry of the Vera C. Rubin Observatory and JWST into operation will increase the number of SNe Ia hosted in galaxies where SBF distances can be measured, making SBF measurements attractive for improving the calibration of SNe Ia, as well as in the estimation of H0.

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“…The Hubble constant H0 is estimated to be about 70 km/Mpc. Recent observations report, for example, 68 km/sMpc [8] and 74 km/sMpc [9]. This value is a universal value for all photons.…”

Section: Large Number Ratiosmentioning

confidence: 77%

Bridging Macro and Micro Cosmos by a New Sight on “Photon Aging” – A Simple Approach for Explaining Diracs Large Numbers

Köhler¹

2020

Preprint

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The energy loss of photons due to the cosmological red shift is interpreted, here, as a periodical process of transferring electromagnetic field energy into the space. The transferred energy portions are independent on photon energy if this transfer occurs with their frequency. The amounts of periodically released energy are so small that the related ultra-long wave length photons have to be understood as perfectly delocalized. Thus, the described point of view bridges the quantum micro cosmos with the macro cosmos. It is proposed to regard this energy exchange as a typical property of universal time arrow and to interpret the “large numbers”, in particular the dimensionless reciprocal of product of Hubbles constant and Planck time as the fundamental parameter describing cosmic evolution.

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A New Measurement of the Hubble Constant and Matter Content of the Universe Using Extragalactic Background Light γ-Ray Attenuation

Cited by 101 publications

References 88 publications

Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

A new measurement of the Hubble constant using Type Ia supernovae calibrated with surface brightness fluctuations

Bridging Macro and Micro Cosmos by a New Sight on “Photon Aging” – A Simple Approach for Explaining Diracs Large Numbers

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