Results 111 to 120 of about 973 (226)

Local Limit of Nonlocal Gravity: Cosmological Perturbations

The Astrophysical Journal
We explore the cosmological implications of the local limit of nonlocal gravity, which is a classical generalization of Einstein’s theory of gravitation within the framework of teleparallelism.
Javad Tabatabaei, Abdolali Banihashemi, Shant Baghram, Bahram Mashhoon   +3 more
doaj   +1 more source

Cosmology of a higher derivative scalar theory with non-minimal Maxwell coupling

European Physical Journal C: Particles and Fields, 2019
Higher derivative scalar field theory in curved space-time belongs to the GLPV theory coupled non-minimally to the Maxwell field is considered. We will show that the theory admits two independent exact de Sitter solutions in the FRW background, one ...
Shahab Shahidi
doaj   +1 more source

Background Instability of Quintessence Model in Light of Entropy and Distance Conjecture

Fortschritte der Physik, Volume 74, Issue 6, June 2026.
ABSTRACT We apply the covariant entropy bound argument supporting the de Sitter swampland conjecture to the quintessence model, to find out the condition for the background to be unstable. More concretely, the background is unstable when the matter entropy given by the species number of the effective field theory increases more rapidly than the ...
Min‐Seok Seo
wiley   +1 more source

Post‐Traumatic Growth in the Global South: Possibilities in Relational Ethics from Communities to Classrooms

TESOL Quarterly, Volume 60, Issue S1, Page S186-S208, June 2026.
Abstract This article reports on a qualitative study of the way instructors and students understand and respond to traumatizing events in a Sri Lankan university. It shows how the attitudes and practices in the society at large are carried over to classrooms even though local institutions do not have a programmatic trauma‐informed pedagogy.
Suresh Canagarajah, Canista Arthie Hensman   +1 more
wiley   +1 more source

Iterative and Steady Black Auroral Stripes and Their Possible Causality in Plasma‐Sheet Electron Distributions: Implications From Low‐Altitude Reimei Observations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Iterative black auroral stripes were identified in auroral images obtained by the low‐altitude microsatellite Reimei. These steady and narrow black stripes are a remarkable feature of diffuse auroras generated by energetic electrons precipitating at higher latitudes than pulsating auroras.
Masafumi Hirahara, Yusuke Ebihara, Mizuki Fukizawa, Takanori Nishiyama, Takeshi Sakanoi   +4 more
wiley   +1 more source

Gravity Wave Activity in the Stratosphere and Mesosphere During Hurricane Sam

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Multi‐instrument observations of gravity wave (GW) activity during Hurricane Sam (2021) were made using AIRS (Atmospheric Infrared Sounder) satellite data, ERA5 reanalysis, and TIMED/SABER temperature profiles. Two GW extraction methods, vertical high‐pass filtering and empirical mode decomposition, were applied to quantify wave‐induced ...
Ayden L. S. Gann, Erdal Yiğit
wiley   +1 more source

Influence of Geomagnetically Induced Currents on Power Line Harmonic Radiation Observed at the Kannuslehto Ground‐Based Station

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract This study investigates the properties of power line harmonic radiation (PLHR), a type of electromagnetic emission generated by electric power networks. In particular, we analyze how the PLHR intensity varies in relation to geomagnetically induced currents (GICs), quasi‐DC currents driven by rapid changes in the geomagnetic field during space ...
K. Drastichová, F. Němec, J. Manninen, T. Raita   +3 more
wiley   +1 more source

Influence of Solar Sails on Magnetic Field Measurements in Space Plasmas

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Solar sail technology is ready to be deployed in a satellite mission carrying a science‐grade magnetometer. In preparation for such a mission, it is essential to characterize the interactions between the sail and the ambient plasma that could affect the magnetometer readings.
Konstantinos Horaites, Juan V. Rodriguez, Ying Liu   +2 more
wiley   +1 more source

Gauge-invariant cosmological perturbations in general teleparallel gravity

European Physical Journal C: Particles and Fields
We study linear cosmological perturbations in the most general teleparallel gravity setting, where gravity is mediated by the torsion and nonmetricity of a flat connection alongside the metric.
Lavinia Heisenberg, Manuel Hohmann
doaj   +1 more source

Nonlinear Evolution of Auroral Fine Structures Through the Feedback Instability in a Dipole Field Configuration

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Nonlinear simulations of the feedback instability in the Alfvénic magnetosphere‐ionosphere (M‐I) coupling system have been carried out by means of the reduced magnetohydrodynamic (MHD) equations with spatially non‐uniform kinematic viscosity and resistivity, coupled with two‐fluid equations, in order to investigate auroral fine‐structure ...
T. Sakaki, T.‐H. Watanabe
wiley   +1 more source