Results 61 to 70 of about 248,477 (327)
Einstein and Rastall theories of gravitation in comparison
European Physical Journal C: Particles and Fields, 2018 We profit by a recent paper of Visser claiming that Rastall gravity is equivalent to Einstein gravity to compare the two gravitational theories in a general way. Our conclusions are different from Visser’s ones.
F. Darabi +4 more
doaj +1 more source
Pure Gauss–Bonnet NUT black hole with and without non-central singularity
European Physical Journal C: Particles and Fields, 2021 It is known that NUT solution has many interesting features and pathologies like being non-singular and having closed timelike curves. It turns out that in higher dimensions horizon topology cannot be spherical but it has instead to be product of 2 ...
Sajal Mukherjee, Naresh Dadhich
doaj +1 more source
Galaxies, 2021 We studied the effects of the Lorentz invariance violation on the rotation of neutron stars (NSs) in the minimal gravitational Standard-Model Extension framework, and calculated the quadrupole radiation generated by them.
Rui Xu, Yong Gao, Lijing Shao
doaj +1 more source
Linear Discontinuity Sharpening for Highly Resolved and Robust Magnetohydrodynamics Simulations
International Journal for Numerical Methods in Fluids, EarlyView.This study applies a reconstruction scheme, “hybrid MUSCL–THINC” for finite volume methods developed by Chiu et al., to magnetohydrodynamics (MHD) simulations. Furthermore, the robustness is improved by a modification that deactivates an artificial compression by THINC depending on the non‐linearity of MHD discontinuities.
Tomohiro Mamashita +2 more
wiley +1 more source
The new worlds observer: The astrophysics strategic mission concept study
EPJ Web of Conferences, 2011 We present some results of the Astrophysics Strategic Mission Concept Study for the New Worlds Observer (NWO). We show that the use of starshades is the most effective and affordable path to mapping and understanding our neighboring planetary systems, to
Cash W.
doaj +1 more source
Materials Genome Engineering Advances, EarlyView.In conventional theories, electron‐phonon relaxation time τe‐p ${\tau }_{e\mbox{-}p}$—the average interval between two consecutive electron‐phonon collisions—is assumed to be independent of electron density. In this study, we establish a new relationship of τe−p=C∗·T−1·n−1/3 ${\tau }_{e-p}={C}^{\ast }\mathit{\cdot }{T}^{-1}\mathit{\cdot }{n}^{-1/3 ...
Ziru Wang +6 more
wiley +1 more source
Letter to the Editor
UHF electromagnetic emission stimulated by HF pumping of the ionosphere [PDF]
Annales Geophysicae, 2002 UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth ...
S. M. Grach +6 more
doaj +1 more source
Exposing and Challenging “Grit” in Physics Education
Science Education, EarlyView.ABSTRACT In STEM education, grit is increasingly the focus of research, with scholars and educators seeking to develop and test interventions that will enhance persistence. As part of the special issue Centering Affect and Emotion Toward Justice and Dignity in Science Education, in this paper, we use interviews with 12 white physics faculty to show ...
Amy Robertson +3 more
wiley +1 more source
E-prints and Journal Articles in Astronomy: a Productive Co-existence
, 2006 Are the e-prints (electronic preprints) from the arXiv repository being used instead of the journal articles? In this paper we show that the e-prints have not undermined the usage of journal papers in the astrophysics community.
Accomazzi, Alberto +9 more
core +1 more source
Sustainable Development, EarlyView.ABSTRACT The study of synergies and trade‐offs among the Sustainable Development Goals (SDGs) has captured growing scientific interest. However, how scientific knowledge addressing multiple SDGs emerges and contributes to improving synergies and addressing trade‐offs remains unclear.
Oscar Yandy Romero‐Goyeneche +2 more
wiley +1 more source