Introduction: A number of now extinct shortlived nuclides, with half-lives ranging from ~10 (Ca) to 10 years (Sm), were present in the early Solar System and provide constraints on chronometry, nucleosynthetic sources of early Solar System materials and provide a tool for identifying the environment where the Solar System formed (such as isolated star formation versus formation in a cluster of ...

There is accumulating evidence that the faint end of the galaxy luminosity function might be very different in different locations. The luminosity function might be sharply rising in rich clusters and flat or declining in regions of low density. If galaxies form according to the model of hierarchical clustering then there should be many small halos compared to the number of big halos. If this t...

ABSTRACT Two types of distance measurement are important in cosmological observations, the angular diameter dA and luminosity dL. In this work, we carried out an assessment theoretical relation between these two measurements, namely cosmic distance–duality relation, from type Ia supernova (SN-Ia) data, chronometer (CC) Hubble parameter baryon acoustic oscillation (BAO) data using Gaussian Proce...

The equation of state parameter is a significant method for characterizing dark energy models. We investigate the evolution with redshift using Bayesian analysis recent observational datasets (the Cosmic Chronometer data (CC) and Pantheon samples). Chevallier–Polarski–Linder parametrization effective parameter, ωeff=ω0+ωaz1+z, where ω0 ωa are free constants, confined to Weyl type f(Q,T) gravity...

Abstract. We describe a new method for the measurement of U/Pb ratios by isotope dilution multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) dating geologically young clean carbonates, particularly speleothems. The is intended materials containing little or no initial 232Th. illustrate and validate with four examples ranging from 0.57 to 20 Ma. capable applying 235U–207Pb ...

The discovery of He retentivity in magnetite has opened up the use (U-Th)/He method as a thermochronometer to date exhumation mafic and ultramafic rocks, also chronometer crystallization during serpentinization. However, published diffusion data reveal more complex behavior than expected. To resolve this issue generalize understanding retention magnetite, we conducted multiscale theoretical stu...