Results 71 to 80 of about 30,104 (177)

Life on Mars? The physiological perspective

Experimental Physiology, EarlyView.
Ronan M. G. Berg, Damian M. Bailey
wiley   +1 more source

Synthesis and Characterization of the Molybdenum Carbonyl‐Functionalized Zintl Ions [(η4‐Pb4)Mo(CO)3]4− and [Pb4{Mo(CO)3}3]6−

Zeitschrift für anorganische und allgemeine Chemie, Volume 652, Issue 13, 1 September 2026.
The reaction of the tetrahedral [Pb4]4− with Mo(CO)4(tmeda) yields two different Mo(CO)3‐functionalized clusters which can both be related to known clusters by the same substitution pattern following the isolobal principle. The crystal structures of [Na([2.2.2]crypt)]2Na2[(η4‐Pb4)Mo(CO)3] · 8.7NH3 and Na6[Pb4{Mo(CO)3}3] · 22NH3 are reported.
Michael Witzmann, Nikolaus Korber
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

Gamma-Ray Bursts: The Energy Monsters of the Universe

Galaxies
Gamma-Ray Bursts(GRBs) are the most violent and energetic astrophysical phenomena, which I dare call “the Energy Monsters of the Universe”. Indeed, they show an enormous emitted isotropic energy ranging from ∼3 × 1046 erg (GRB 170817A) to ∼1055 erg (GRB ...
Franco Giovannelli
doaj   +1 more source

Constraining the minimally extended varying speed of light model using time dilations

Frontiers in Astronomy and Space Sciences
The Robertson–Walker (RW) metric, derived from the cosmological principle and Weyl’s postulate, characterizes the ΛCDM cosmological model. Traditionally, in this framework, the assumption of a constant speed of light leads to specific cosmological time ...
Seokcheon Lee
doaj   +1 more source

Maven: a multimodal foundation model for supernova science

Machine Learning: Science and Technology
A common setting in astronomy is the availability of a small number of high-quality observations, and larger amounts of either lower-quality observations or synthetic data from simplified models.
Gemma Zhang, Thomas Helfer, Alexander T Gagliano, Siddharth Mishra-Sharma, V Ashley Villar   +4 more
doaj   +1 more source

An Accelerating Universe without Lambda: Delta Gravity Using Monte Carlo

Universe, 2019
A gravitational field model based on two symmetric tensors, g μ ν and g ˜ μ ν , is studied, using a Markov Chain Monte Carlo (MCMC) analysis with the most updated catalog of SN-Ia.
Jorge Alfaro, Marco San Martín, Joaquín Sureda   +2 more
doaj   +1 more source

Constraining the Initial Mass Function via Stellar Transients

Universe
The stellar initial mass function (IMF) represents a fundamental quantity in astrophysics and cosmology describing the mass distribution of stars from low mass all the way up to massive and very massive stars. It is intimately linked to a wide variety of
Francesco Gabrielli, Lumen Boco, Giancarlo Ghirlanda, Om Sharan Salafia, Ruben Salvaterra, Mario Spera, Andrea Lapi   +6 more
doaj   +1 more source

Revealing the True Nature of Hen 2-428

Galaxies, 2018
The nucleus of Hen 2-428 is a short orbital period (4.2 h) spectroscopic binary, whose status as potential supernovae type Ia progenitor has raised some controversy in the literature.
Nicole Reindl, Nicolle L. Finch, Veronika Schaffenroth, Martin A. Barstow, Sarah L. Casewell, Stephan Geier, Marcelo M. Miller Bertolami, Stefan Taubenberger   +7 more
doaj   +1 more source

A Very-High-Energy Gamma-Ray View of the Transient Sky

Universe
The development of the latest generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) over recent decades has led to the discovery of new extreme astrophysical phenomena in the very-high-energy (VHE, E > 100 GeV) gamma-ray regime.
Alessandro Carosi, Alicia López-Oramas
doaj   +1 more source