A roadmap to gamma-ray bursts: new developments and applications to cosmology

Luongo, Orlando; Muccino, M.

doi:10.48550/arxiv.2110.14408

Cited by 1 publication

(1 citation statement)

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“…Several empirical correlations using parameters of the light curves and spectra have been proposed to standardize the GRBs' luminosity. They include correlations between (i) the GRB spectrum lag time 𝜏 𝑙𝑎𝑔 and isotropic peak luminosity 𝐿 (𝜏 𝑙𝑎𝑔 − 𝐿 relation) [66]; (ii) the peak energy 𝐸 𝑝 of the 𝜈𝐹 𝜈 spectrum and the isotropic equivalent energy 𝐸 𝑖𝑠𝑜 (𝐸 𝑝 − 𝐸 𝑖𝑠𝑜 relation) [67]; (iii) the time variability 𝑉 and isotropic peak luminosity (𝑉 − 𝐿 relation) [68], (iv) the peak energy of the 𝜈𝐹 𝜈 spectrum and the isotropic peak luminosity (𝐸 𝑝 − 𝐿 relation) [69]; (v) the minimum rise time 𝜏 𝑅𝑇 of the light curve and isotropic peak luminosity (𝜏 𝑅𝑇 − 𝐿 relation) [70]; (vi) the peak energy and collimation-corrected energy 𝐸 𝛾 (𝐸 𝑝 − 𝐸 𝛾 relation) [71,72]; (vii) the peak luminosity, the time at the end of the plateau emission phase 𝜏 𝑎 , and the luminosity at the end of the plateau phase 𝐿 𝑎 (𝐿 − 𝜏 𝑎 − 𝐿 𝑎 relation -Dainotti 3D Fundamental Plane) [73, 74,75]; and some more [e.g., 76,77,78,79,80,81,82,83].…”

Section: Gamma-ray Bursts Hubble Diagrammentioning

confidence: 99%

Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs

Gupta

2023

Symmetry

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Dirac, in 1937, proposed the potential variation of coupling constants derived from his large numbers hypothesis. Efforts have continued since then to constrain their variation by various methods, including astrophysical and cosmological observations. We briefly discuss several methods used for the purpose while focusing primarily on the use of supernovae type 1a, quasars, and gamma-ray bursts as cosmological probes for determining cosmological distances. Supernovae type Ia (SNeIa) are considered the best standard candles since their intrinsic luminosity can be determined precisely from their light curves. However, they have only been observed up to about redshift z = 2.3, mostly at z ≤ 1.5. Quasars are the brightest non-transient cosmic sources in the Universe. They have been observed up to z = 7.5. Certain types of quasars can be calibrated well enough for their use as standard candles but with a higher degree of uncertainty in their intrinsic luminosity than SNeIa. Gamma-ray bursts (GRBs) are even brighter than quasars, and they have been observed up to z = 9.4. They are sources of highly transient radiation lasting from tens of milliseconds to several minutes and, in rare cases, a few hours. However, they are even more challenging to calibrate as standard candles than quasars. Both quasars and GRBs use SNeIa for distance calibration. What if the standard candles’ intrinsic luminosities are affected when the coupling constants become dynamic and depend on measured distances? Assuming it to be constant at all cosmic distances leads to the wrong constraint on the data-fitted model parameters. This paper uses our earlier finding that the speed of light c, the gravitational constant G, the Planck constant h, and the Boltzmann constant k vary in such a way that their variation is interrelated as \({G \sim c^{3} \sim h^{3} \sim k^{3/2}}\) with \({\overset{.}{G}/G = 3\overset{.}{c}/c = 3\overset{.}{h}/h = 1.5\overset{.}{k}/k}\) = 3.90(±0.04) × \({10^{-10}}\) yr\({^{-1}}\) and corroborates it with SNeIa, quasars, and GRBs observational data. Additionally, we show that this covarying coupling constant model may be better than the standard \({\Lambda}\)CDM model for using quasars and GRBs as standard candles and predict that the mass of the GRBs scales with z as \({((1+z)^{1/3}-1)}\). Noether’s symmetry on the coupling constants is now transferred effectively to the constant in the function relating to their variation.

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Section: Gamma-ray Bursts Hubble Diagrammentioning

confidence: 99%

Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs

Gupta

2023

Symmetry

View full text Add to dashboard Cite

show abstract

A roadmap to gamma-ray bursts: new developments and applications to cosmology

Cited by 1 publication

References 213 publications

Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs

Constraining Coupling Constants’ Variation with Supernovae, Quasars, and GRBs

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