Fitting of supernovae without dark energy

López-Corredoira, Martín; Calvo-Torel, J. I.

doi:10.1142/s0218271822501048

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…However, some points seem to still be favored by the ΛCDM model, such as the matter content (Mitra 2014), the Type Ia supernova (SN) luminosity distance-redshift relation (Bilicki & Seikel 2012;Shafer 2015;Hu & Wang 2018;López-Corredoira & Calvo-Torel 2022), the first baryon acoustic oscillations (BAO) peak position (Tutusaus et al 2016;Planck Collaboration et al 2020a, 2020bFujii 2020), and high-redshift quasars (Bilicki & Seikel 2012;Fan et al 2023), among others. To solve these tensions, Monjo (2018) proposed a geometric link between linear and accelerated universes that emerges from the hyperconical model, developed by Monjo (2017) and Monjo & Campoamor-Stursberg (2020.…”

Section: Motivationmentioning

confidence: 99%

What if the Universe Expands Linearly? A Local General Relativity to Solve the “Zero Active Mass” Problem

Monjo

2024

ApJ

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Modern cosmology presents important challenges such as the Hubble Tension, El Gordo’s collision, or the impossible galaxies (z > 10). Slight modifications to the standard model propose new parameters (e.g., the early and dynamical dark energy). On the other hand, alternatives such as the coasting universes (e.g., the hyperconical model and the spatially flat R h = ct universe) are statistically compatible with most of the observational tests, but still present theoretical problems in matching the observed matter contents since they predict a “zero active gravitational mass.” To solve these open issues, we suggest that general relativity might be not valid at cosmic scales, but it would be valid at local scales. This proposal is addressed from two main features of the embedding hyperconical model: (1) the background metric would be independent of the matter content, and (2) the observed cosmic acceleration would be fictitious and because of a distorted stereographic projection of coordinates that produce an apparent radial inhomogeneity from homogeneous manifolds. Finally, to support the discussion, standard observational tests were updated here, showing that the hyperconical model is adequately fitted to Type Ia supernovae, quasars, galaxy clusters, baryon acoustic oscillations, and cosmic chronometer data sets.

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Section: Motivationmentioning

confidence: 99%

What if the Universe Expands Linearly? A Local General Relativity to Solve the “Zero Active Mass” Problem

Monjo

2024

ApJ

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“…The photon rest mass can then be effectively constrained by seeking such effects [8][9][10][11][12][13][14]. Over the last few decades, a number of methods have been proposed to constrain the photon mass, including tests of Coulomb's inverse square law [15], tests of Ampère's law [16], experiments of Cavendish torsion balance [17], exploration on the gravitational deflection of electromagnetic waves [9,18], measurement of Jupiter's magnetic field [19], analysis of cosmic magnetic field vector potential [20,21], measurement of redshift/blueshift associated with alternative fits of the Hubble diagram of type Ia supernovae (SNe Ia; [7,22]), and so on.…”

Section: Introductionmentioning

confidence: 99%

Revisiting constraints on the photon rest mass with cosmological fast radio bursts

Wang,

Wei,

et al. 2023

J. Cosmol. Astropart. Phys.

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Fast radio bursts (FRBs) have been suggested as an excellent celestial laboratory for testing the zero-mass hypothesis of the photon. In this work, we use the dispersion measure (DM)–redshift measurements of 23 localized FRBs to revisit the photon rest mass mγ . As an improvement over previous studies, here we take into account the more realistic probability distributions of DMs contributed by the FRB host galaxy and intergalactic medium (IGM) from the IllustrisTNG simulation. To better account for the systematic uncertainty induced by the choices of priors of cosmological parameters, we also combine the FRB data with the cosmic microwave background data, the baryon acoustic oscillation data, and type Ia supernova data to constrain the cosmological parameters and mγ simultaneously. We derive a new upper limit of mγ ≤ 3.8 × 10-51 kg, or equivalently mγ ≤ 2.1 × 10-15 eV/c2 (mγ ≤ 7.2 × 10-51 kg, or equivalently mγ ≤ 4.0 × 10-15 eV/c2) at 1σ (2σ) confidence level. Meanwhile, our analysis can also lead to a reasonable estimation for the IGM baryon fraction f IGM = 0.873+0.061 -0.050. With the number increment of localized FRBs, the constraints on both mγ and f IGM will be further improved. A caveat of constraining mγ within the context of the standard ΛCDM cosmological model is also discussed.

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JWST early Universe observations and ΛCDM cosmology

Gupta

2023

Monthly Notices of the Royal Astronomical Society

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Deep space observations of the James Webb Space Telescope (JWST) have revealed that the structure and masses of very early Universe galaxies at high redshifts ($z\sim 15$), existing at $\sim $0.3 Gyr after the BigBang, may be as evolved as the galaxies in existence for $\sim 10$ Gyr. The JWST findings are thus in strong tension with the ${\rm{\Lambda }}$CDM cosmological model. While tired light (TL) models have been shown to comply with the JWST angular galaxy size data, they cannot satisfactorily explain isotropy of the cosmic microwave background (CMB) observations or fit the supernovae distance modulus vs. redshift data well. We have developed hybrid models that include the tired light concept in the expanding universe. The hybrid ${\rm{\Lambda }}$CDM model fits the supernovae type 1a data well but not the JWST observations. We present a model with covarying coupling constants (CCC), starting from the modified FLRW metric and resulting Einstein and Friedmann equations, and a CCC + TL hybrid model. They fit the Pantheon + data admirably, and the CCC + TL model is compliant with the JWST observations. It stretches the age of the universe to 26.7 Gyr with 5.8 Gyr at $z\,\, = \,\,10$ and 3.5 Gyr at $z\,\, = \,\,20$, giving enough time to form massive galaxies. It thus resolves the ‘impossible early galaxy’ problem without requiring the existence of primordial black hole seeds or modified power spectrum, rapid formation of massive population III stars, and super Eddington accretion rates. One could infer the CCC model as an extension of the ${\rm{\Lambda }}$CDM model with a dynamic cosmological constant.

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Fitting of supernovae without dark energy

Cited by 6 publications

References 38 publications

What if the Universe Expands Linearly? A Local General Relativity to Solve the “Zero Active Mass” Problem

What if the Universe Expands Linearly? A Local General Relativity to Solve the “Zero Active Mass” Problem

Revisiting constraints on the photon rest mass with cosmological fast radio bursts

JWST early Universe observations and ΛCDM cosmology

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