Results 81 to 90 of about 724 (182)
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 ...
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Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.Abstract Lava tubes are subsurface volcanic conduits formed during effusive basaltic eruptions and are considered key targets for planetary exploration. Orbital remote sensing on the Moon and Mars has identified numerous collapse pits interpreted as possible surface expressions of underlying lava tube systems. However, the limited resolution of current
A. Ghirotto +8 more
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Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.Abstract Io's tenuous atmosphere consists primarily of sulfur dioxide (SO2 ${\text{SO}}_{2}$) with observed column densities of approximately 1016−1017 $1{0}^{16}-1{0}^{17}$ cm−2 ${\text{cm}}^{-2}$. However, it remains uncertain whether the sublimation of SO2 ${\text{SO}}_{2}$ surface frost or volcanic outgassing is the primary source of the SO2 ...
Leander Schlarmann +4 more
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Inflationary resolution of the initial singularity
Physics Letters BThe 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
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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
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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
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, 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.
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Assisted Inflation in Bianchi VI0 Cosmologies [PDF]
General Relativity and Gravitation, 2002 11 ...
Aguirregabiria, J. M. +2 more
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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 +8 more
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Clockwork axions in cosmology. Is chromonatural inflation chrononatural?
Journal of High Energy Physics, 2018 Many cosmological models rely on large couplings of axions to gauge fields. Examples include theories of magnetogenesis, inflation on a steep potential, chiral gravitational waves, and chromonatural inflation. Such theories require a mismatch between the
Prateek Agrawal, JiJi Fan, Matthew Reece
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