Results 141 to 150 of about 406,699 (273)

Observational test of inflation in loop quantum cosmology [PDF]

, 2011
We study in detail the power spectra of scalar and tensor perturbations generated during inflation in loop quantum cosmology (LQC). After clarifying in a novel quantitative way how inverse-volume corrections arise in inhomogeneous set- tings, we show ...
M. Bojowald, G. Calcagni, S. Tsujikawa
semanticscholar   +1 more source

Geomorphological Evidence of Near‐Surface Ice at Candidate Landing Sites in Northern Amazonis Planitia, Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract This work presents geomorphological analyses of an area at the boundary between Arcadia Planitia and northern Amazonis Planitia, situated in the northern mid‐latitudes of Mars. Recent studies have indicated the presence of substantial volumes of near‐surface excess ice in Arcadia Planitia, making this region a promising candidate for future ...
Erica Luzzi, Jennifer L. Heldmann, Kaj E. Williams, Giacomo Nodjoumi, Ariel Deutsch, Alexander Sehlke   +5 more
wiley   +1 more source

Initial conditions for hybrid inflation

, 2000
In hybrid inflation models, typically only a tiny fraction of possible initial conditions give rise to successful inflation, even if one assumes spatial homogeneity.
A. D. Linde, A. Linde, A. Linde, A. Linde, A. R. Liddle, A. R. Liddle, A. R. Liddle, A. Vilenkin, Andrew R. Liddle, C. Panagiotakopoulos, D. Goldwirth, D. Goldwirth, D. H. Lyth, E. F. Bunn, E. Fahri, E. J. Copeland, G. Felder, G. Lazarides, G. Lazarides, H. Kodama, J. Kung, J. M. Cline, L. Randall, Luís E. Mendes, M. C. Bento, M. Gogberashvili, N. Arkani-Hamed, N. J. Cornish, N. Tetradis, P. Binétruy, P. Kanti, R. Easther, R. Maartens, R. Maartens, T. Shiromizu, T. Vachaspati, V. A. Rubakov, Z. Berezhiani   +37 more
core   +1 more source

Coronae on Venus: An Updated Global Database and Insights Into Morphology, Spatial Distribution, Geological Setting, and Lithospheric Properties

Journal of Geophysical Research: Planets, Volume 130, Issue 5, May 2025.
Abstract Venus' surface hosts many volcanic and tectonic features, among which coronae are widespread. Despite their inferred significance for Venus' geodynamics, existing corona databases have been incomplete and/or inaccessible. Here, we present an updated database of coronae, which integrates and validates existing data sets while incorporating new ...
A. J. P. Gülcher, L. Sabbeth, E. Stofan, S. E. Smrekar   +3 more
wiley   +1 more source

New Models of Jupiter's Magnetopause and Bow Shock Through the Juno Prime Mission: Probabilistic Location, Shape, and Internally‐Driven Variation

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract The interaction between Jupiter's magnetosphere and the solar wind is not well‐constrained: while internal energetic plasma processes are thought to dominate plasma circulation, the solar wind nonetheless exerts significant control over the shape and scale of the whole structure.
M. J. Rutala, C. M. Jackman, C. K. Louis, A. R. Azari, F. Bagenal, S. P. Joy, W. S. Kurth, T. B. Keebler, R. S. Giles, R. W. Ebert, C. F. Bowers, M. F. Vogt   +11 more
wiley   +1 more source

Beyond Inflation: A Cyclic Universe Scenario

, 2004
Inflation has been the leading early universe scenario for two decades, and has become an accepted element of the successful `cosmic concordance' model. However, there are many puzzling features of the resulting theory.
Seinhardt, Paul J., Turok, Neil
core   +1 more source

Reconnection Onset in Overstretched Thin Current Sheets: PIC Simulations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract Onset of reconnection in the magnetotail requires its current sheet (CS) to thin down to the thermal ion gyroradius (or thinner) to demagnetize ions (or even electrons) and to provide their Landau dissipation. However, in isotropic plasma models of the tail the ion‐scale CSs inflate too rapidly with the distance from Earth to remain ion‐scale ...
M. I. Sitnov, H. Arnold
wiley   +1 more source

Quantum Cosmology of Quadratic f(R) Theories with a FRW Metric

Advances in Mathematical Physics, 2017
We study the quantum cosmology of a quadratic fR theory with a FRW metric, via one of its equivalent Horndeski type actions, where the dynamic of the scalar field is induced.
V. Vázquez-Báez, C. Ramírez
doaj   +1 more source

Model building with non-compact cosets

Physics Letters B, 2016
We explore Goldstone boson potentials in non-compact cosets of the form SO(n,1)/SO(n). We employ a geometric approach to find the scalar potential, and focus on the conditions under which it is compact in the large field limit.
Djuna Lize Croon
doaj   +1 more source

Mirage cosmology with an unstable probe D3-brane

, 2005
We consider the mirage cosmology by an unstable probe brane whose action is represented by BDI action with tachyon. We study how the presence of tachyon affects the evolution of the brane inflation.
Dong Hyeok Jeong, E. Papantonopoulos, Jin Young Kim   +2 more
core   +3 more sources