Results 121 to 130 of about 16,133 (302)

Visible, near‐, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids

Meteoritics &Planetary Science, EarlyView.
Abstract Remote spectroscopy is used to characterize the mineralogy and infer the history of planetary bodies. Carbonaceous asteroids, such as B‐type (101955) Bennu, represent the earliest stages of planet formation. B types have a blue (negative) spectral slope and comprise <5% of asteroids.
V. E. Hamilton, E. A. Cloutis, R. E. Milliken, P. Haenecour, D. R. Golish, K. J. Domanik, T. J. McCoy, L. P. Keller, A. A. Simon, H. H. Kaplan, C. A. Goodrich, S. A. Sandford, D. Applin, T. Hiroi, D. H. Hill, N. G. Lunning, F. M. McCubbin, S. A. Eckley, C. J. Snead, E. H. Blumenfeld, J. E. Aebersold, C. Schultz, N. Bowles, K. A. Shirley, S. S. Russell, J. J. Barnes, T. J. Zega, D. N. DellaGiustina, A. J. Ryan, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr., D. S. Lauretta   +32 more
wiley   +1 more source

Determining Evolution of Cosmological Constant, Gravitational Constant and Speed of Light Using Nonadiabatic Cosmological Model and LLR Findings

Galaxies, 2019
We have shown that the Hubble constant H 0 embodies the information about the evolutionary nature of the cosmological constant Λ , gravitational constant G , and the speed of light c .
Rajendra P. Gupta
doaj   +1 more source

On the canonical energy of weak gravitational fields with a cosmological constant Λ ∈ R. [PDF]

Eur Phys J C Part Fields, 2021
Chruściel PT, Hoque SJ, Maliborski M, Smołka T.   +3 more
europepmc   +1 more source

Advanced aqueous alteration in primitive meteorites: Micro‐ to nanoscale studies of CR1 iron sulfides

Meteoritics &Planetary Science, EarlyView.
Abstract This study documents micro‐ to nanoscale observations of primary nebular and secondary parent body iron sulfides in the CR1 GRO 95577. Despite the extensive alteration of the bulk sample, some primary sulfides managed to avoid alteration, having originally formed in the solar nebula during chondrule formation by either fission‐sulfidization or
S. A. Singerling
wiley   +1 more source

Upper Bounds on the Mass of Fundamental Fields from the Primordial Universe

The Astrophysical Journal
We study the fluctuations in the vacuum zero-point energy associated with quantum fields and their statistical distributions during inflation. It is shown that the perturbations in the vacuum zero-point energy have large amplitudes that are highly non ...
Hassan Firouzjahi
doaj   +1 more source

Static spherically symmetric black holes of de Rham–Gabadadze–Tolley massive gravity in arbitrary dimensions

Physics Letters B, 2017
This article is devoted to static spherically symmetric black hole solutions of dRGT (de Rham–Gabadadze–Tolley) massive gravity in the presence of cosmological constant. The unitary and non-unitary gauges are used to find the solutions in three, four and
Ghadir Jafari, Mohammad R. Setare, Hamid R. Bakhtiarizadeh   +2 more
doaj   +1 more source

Linking the supersymmetric standard model to the cosmological constant. [PDF]

J High Energy Phys, 2021
Qiu YC, Tye SH.
europepmc   +1 more source

Evidence of a local BCC‐type coordination of cobalt in FCC taenite of iron meteorites

Meteoritics &Planetary Science, EarlyView.
Abstract Ni, Co, and Fe K‐edge X‐ray absorption fine structure (XAFS) measurements were performed, revealing an unexpected local structure around Co in well‐known iron and stony‐iron meteorites. Cobalt is enriched in kamacite but remains in taenite at concentrations of at least 0.3 atom%.
Kanako Yoshihara, Akira Yoshiasa, Huimin Shao, Makoto Tokuda, Ginga Kitahara, Hiroshi Isobe   +5 more
wiley   +1 more source

Cosmological model from the holographic equipartition law with a modified Rényi entropy

European Physical Journal C: Particles and Fields, 2017
Cosmological equations were recently derived by Padmanabhan from the expansion of cosmic space due to the difference between the degrees of freedom on the surface and in the bulk in a region of space. In this study, a modified Rényi entropy is applied to
Nobuyoshi Komatsu
doaj   +1 more source

A dynamical approach to the cosmological constant [PDF]

, 2008
This Letter presents an exact analytic solution of a simple cosmological model in presence of both nonrelativistic matter and scalar field where Einstein's cosmological constant Λ appears as an integration constant.
Wang, Wen Fu, Yang, Shu Zheng
core   +1 more source