Measurement of the universe expansion rate through cosmic chronometers proves to be a novel approach understanding history. Although it provides direct determination Hubble parameters at different redshifts, suffers from underlying systematic uncertainties. In this work, we analyze recent chronometer data with and without uncertainties investigate how they affect results. We perform our analysi...

Introduction: The high-resolution Al-Mg extinct chronometer (t1/2 = 0.72 Myr) has been applied extensively towards constraining the chronology of the early Solar System. In particular, there have been many investigations of the Al-Mg systematics in the calciumaluminum-rich inclusions (CAIs), which has been used to infer the age of the Solar System since these objects represent the earliest-form...

Abstract We consider the effective field theory formulation of torsional gravity in a cosmological framework to alter background evolution. Then we use latest H 0 measurement from SH0ES Team, as well observational Hubble data cosmic chronometer and radial baryon acoustic oscillations, reconstruct f ( T ) form model-independent way by applying Gaussian processes. Since special square-root term d...

Slow neutron capture reactions in massive stars are substantially contributing to the abundances of the elements between Fe and Zr, producing the so-called weak s component. The weak s process is characterized by a low neutron exposure, where the reaction flow does not reach equilibrium conditions. As a consequence, uncertainties in the stellar (n,γ) rates give rise to large propagation effects...

A key pillar of modern cosmology, Big Bang Nucleosynthesis (BBN) offers a probe of the particle content and expansion rate of the Universe a mere few minutes after the beginning. When compared with the BBN predictions, the observationally inferred primordial abundances of deuterium and helium-4 provide an excellent baryometer and chronometer respectively. Several hundred thousand years later, w...

We have found that individual presolar silicon carbide (SiC) dust grains from supernovae show a positive correlation between 49Ti and 28Si excesses, which is attributed to the radioactive decay of the short-lived (t½ = 330 days) 49V to 49Ti in the inner highly 28Si-rich Si/S zone. The 49V-49Ti chronometer shows that these supernova SiC dust grains formed at least 2 years after their parent star...

The primordial abundances of deuterium, helium-3, helium-4, and lithium-7 probe the baryon density of the Universe only a few minutes after the Big Bang. Of these relics from the early Universe, deuterium is the baryometer of choice. After reviewing the current observational status of the relic abundances (a moving target!), the baryon density determined by big bang nucleosynthesis (BBN) is der...

In order to investigate whether or not 26Al can be used as a fine-scale chronometer for early solar system events we measured, with an ion microprobe, Mg isotopes and Al/Mg ratios in separated plagioclase, olivine, and pyroxene crystals from the H4 chondrites Ste Marguerite (SM), Forest Vale (FV), Beaver Creek and Quenggouk and compared the results with the canonical 26Al/27Al ratio for calcium...

We reconstruct the effective Equation of State (EoS) within framework General Relativity (GR) theory in a homogeneous and isotropic FLRW Universe, which is assumed to be composed matter Dark Energy (DE). Our analysis employs dataset consisting 31 Cosmic Chronometer (CC) data points, six points Baryon Acoustic Oscillations (BAO), 1048 Type Ia Supernovae (SN) from Pantheon sample, we determine be...