Results 71 to 80 of about 708 (181)

Crosstalk in O2+ and CO2+ Channel Groups of MAVEN/NGIMS Ion Measurements

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract The Neutral Gas and Ion Mass Spectrometer (NGIMS) onboard the Mars Atmosphere and Volatile EvolutioN mission has provided critical insights into the composition and isotopic structure of Mars' ionosphere. However, significant model‐observation discrepancies of densities of some ion species suggest the presence of crosstalk, that is ...
Long Cheng, Erik Vigren, A. R. Poppe
wiley   +1 more source

Kinetic inflation in stringy and other cosmologies [PDF]

Physical Review D, 1995
An inflationary epoch driven by the kinetic energy density in a dynamical Planck mass is studied. In the conformally related Einstein frame it is easiest to see the demands of successful inflation cannot be satisfied by kinetic inflation alone. Viewed in the original Jordan-Brans-Dicke frame, the obstacle is manifest as a kind of graceful exit problem ...
openaire   +3 more sources

The Partition of Energy Flux Transport at Bursty Bulk Flows

Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.
Abstract Bursty bulk flows (BBFs) are fast flows of plasma in the tail and are responsible for much of the energy flux transport earthward from the tail into the inner magnetosphere despite being relatively short‐lived. BBFs are often accompanied by injections in which particles that have been accelerated to 10–100s of keV are transported earthward. We
S. N. F. Chepuri, P. H. Reiff, A. N. Jaynes, D. J. Gershman, D. L. Turner, C. Gabrielse, I. J. Cohen, D. N. Baker, T. Leonard   +8 more
wiley   +1 more source

Cosmology without inflation [PDF]

Physical Review D, 2008
We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce. This category of models, being geodesically complete, is non-singular and horizon-free, and can be made to prevent any relevant scale to ever have been smaller than the Planck ...
Peter, Patrick, Pinto-Neto, Nelson
openaire   +3 more sources

Catch-me-if-you-can: the overshoot problem and the weak/inflation hierarchy

Journal of High Energy Physics, 2022
We study the overshoot problem in the context of post-inflationary string cosmology (in particular LVS). LVS cosmology features a long kination epoch as the volume modulus rolls down the exponential slope towards the final minimum, with an energy density
Joseph P. Conlon, Filippo Revello
doaj   +1 more source

Characterizing Martian Lithospheric Density Distribution Through Bayesian Gravity Analysis

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract One of the best sources of information for probing the inner structure of Mars is gravimetry data from satellites. By combining these measurements with topography data and isostatic theory, the aim of this study is to infer information about lateral density variations in the Martian lithosphere. Previous efforts at direct gravity inversion had
Henrietta Rákóczi, B. C. Root, Christopher Messenger, Giles Hammond   +3 more
wiley   +1 more source

Stratigraphy Preserved on the Jezero Crater Rim Reveals Repeated Impacts on Early Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract The outer slopes of the western Jezero crater rim are hypothesized to expose sections of Early‐ to Pre‐Noachian crust uplifted by the Jezero impact, providing an excellent opportunity to investigate the earliest geologic processes active on terrestrial planets.
Alexander J. Jones, Sanjeev Gupta, Robert Barnes, Samantha Gwizd, Kathryn M. Stack, Briony Horgan, Sanna Alwmark, Athanasios Klidaras, Eleni Ravanis, Sarah Fagents, Gerhard Paar, James F. Bell III, Justin N. Maki, Margaret Deahn, Candice Bedford, Nicolas Mangold, Michael Bramble, Justin I. Simon, Lisa Mayhew, Cathy Quantin‐Nataf, Larry Crumpler, Christoph Traxler, Chris Herd, Olivier Beyssac, Nicolas Randazzo, Uni Árting, Roger C. Wiens, Kenneth A. Farley   +27 more
wiley   +1 more source

Inflationary resolution of the initial singularity

Physics Letters B
The inflationary paradigm has transformed our understanding of the early universe; yet most inflationary models are considered geodesically past-incomplete, suggesting a beginning of time or a primordial Big Bang singularity. The Borde-Guth-Vilenkin (BGV)
Damien A. Easson, Joseph E. Lesnefsky
doaj   +1 more source

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, Volume 61, Issue 7, Page 1288-1308, July 2026.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Cosmological inflation

, 2012
The very basics of cosmological inflation are discussed. We derive the equations of motion for the inflaton field, introduce the slow-roll parameters, and present the computation of the inflationary perturbations and their connection to the temperature fluctuations of the cosmic microwave background.
openaire   +2 more sources