Results 91 to 100 of about 400,960 (288)

Electron Energy Spectra in Jupiter's Radiation Belts From Juno‐JEDI

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract Radiation transport simulations of the Jupiter Energetic‐particle Detector Instrument (JEDI) onboard the Juno spacecraft were performed to understand its response to high energy electrons. Determination of the JEDI response function is the first rigorous effort of its kind and was used to reconstruct the true electron foreground, extending the
B. X. Zhu, I. Jun, P. Kollmann, C. Paranicas   +3 more
wiley   +1 more source

Including Atmospheric Backscatter Effects in Modeling of EMIC Wave‐Driven Precipitation

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract Pitch‐angle diffusion is a key mechanism driving radiation belt electron loss into the atmosphere. However, traditional bounce‐averaged models, which assume complete atmospheric absorption for loss cone electrons, cannot accurately quantify the loss cone fluxes.
Zhi‐Gu Li, Weichao Tu, Richard Selesnick, Luisa Capannolo, Grant Berland, Qianli Ma   +5 more
wiley   +1 more source

The Hubble tension: Relativistic dark matter production from long-lived particles

Nuclear Physics B
The tension between direct measurements of the Hubble constant and those stemming from Cosmic Microwave Background probes has triggered a multitude of studies.
Alvaro S. de Jesus, Matheus M.A. Paixão, Dêivid R. da Silva, Farinaldo S. Queiroz, Nelson Pinto-Neto   +4 more
doaj   +1 more source

Effective Field Theories for heavy probes in a hot QCD plasma and in the early universe

EPJ Web of Conferences, 2017
There are many interesting problems in heavy-ion collisions and in cosmology that involve the interaction of a heavy particle with a medium. An example is the dissociation of heavy quarkonium seen in heavy-ion collisions.
Escobedo Miguel A.
doaj   +1 more source

Prediction of the Wave Normal Angle of Proton‐Band EMIC Waves Near Geosynchronous Orbit

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We investigate how the wave normal angle (WNA) and polarization of proton‐band electromagnetic ion cyclotron (EMIC) waves change as they travel from their source to Earth. This paper marks a significant milestone as the first full‐wave simulation of proton‐band EMIC waves reflecting from the ionosphere.
Eun‐Hwa Kim, Khan‐Hyuk Kim, Jay R. Johnson, Peter A. Damiano, Syun'ichi Shiraiwa, Yu Lin, Wesley Martin   +6 more
wiley   +1 more source

Dark Matter Prediction from Canonical Quantum Gravity with Frame Fixing

, 2004
We show how, in canonical quantum cosmology, the frame fixing induces a new energy density contribution having features compatible with the (actual) cold dark matter component of the Universe. First we quantize the closed Friedmann-Robertson-Walker (FRW)
Lemaitre G., Mercuri S., Mercuri S., Montani G., Montani G., Peebles P. J. E., Roberts M. S., Sakurai J. J., Tolman R. C.   +8 more
core   +1 more source

The cosmological nature of the dark Universe

European Physical Journal C: Particles and Fields, 2018
This paper deals with the cancellation mechanism, which identifies the energy density of space-time expansion in an empty universe with the zero-point energy density and avoids the scale discrepancy with the observed energy density (cosmological constant
Christian Henke
doaj   +1 more source

Backreaction Issues in Relativistic Cosmology and the Dark Energy Debate [PDF]

, 2006
The effective evolution of an inhomogeneous universe model in Einstein’s theory of gravitation may be described in terms of spatially averaged scalar variables.
T. Buchert
semanticscholar   +1 more source

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

The simplicity of physical laws

Noûs, Volume 59, Issue 4, Page 957-987, December 2025.
Abstract Physical laws are strikingly simple, yet there is no a priori reason for them to be so. I propose that nomic realists—Humeans and non‐Humeans—should recognize simplicity as a fundamental epistemic guide for discovering and evaluating candidate physical laws.
Eddy Keming Chen
wiley   +1 more source