Results 91 to 100 of about 258,357 (262)

What can we say about seed fields for galactic dynamos?

, 2012
We demonstrate that a quasi-uniform cosmological seed field is a much less suitable seed for a galactic dynamo than has often been believed. The age of the Universe is insufficient for a conventional galactic dynamo to generate a contemporary galactic ...
Brandenburg A, David Moss, Dmitry Sokoloff, Moss D, Moss D, Neronov AV, Sokoloff D, Subramanian K, Sur S, Zeldovich YaB   +9 more
core   +2 more sources

The DNA of Calabi–Yau Hypersurfaces

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract Genetic Algorithms are implemented for triangulations of four‐dimensional reflexive polytopes, which induce Calabi–Yau threefold hypersurfaces via Batyrev's construction. These algorithms are shown to efficiently optimize physical observables such as axion decay constants or axion–photon couplings in string theory compactifications.
Nate MacFadden, Andreas Schachner, Elijah Sheridan   +2 more
wiley   +1 more source

Excitation of Inertial Modes in 3D Simulations of Rotating Convection in Planets and Stars

The Astrophysical Journal
Thermal convection in rotating stars and planets drives anisotropic turbulence and differential rotation, both capable of feeding energy into global oscillations.
J. R. Fuentes, Ankit Barik, Jim Fuller
doaj   +1 more source

Testing the Steady-State Fluctuation Relation in the Solar Photospheric Convection

Entropy, 2020
The turbulent thermal convection on the Sun is an example of an irreversible non-equilibrium phenomenon in a quasi-steady state characterized by a continuous entropy production rate.
Giorgio Viavattene, Giuseppe Consolini, Luca Giovannelli, Francesco Berrilli, Dario Del Moro, Fabio Giannattasio, Valentina Penza, Daniele Calchetti   +7 more
doaj   +1 more source

Magnetic Reconnection in Astrophysical Environments

, 2014
Magnetic reconnection is a process that changes magnetic field topology in highly conducting fluids. Traditionally, magnetic reconnection was associated mostly with solar flares.
Eyink, G., Kowal, G., Lazarian, A, Vishniac, E.   +3 more
core   +1 more source

Interpreting Changes in Global Methane Budget in a Chemistry‐Climate Model Constrained With Methane and Isotopic Observations

AGU Advances, Volume 7, Issue 1, February 2026.
Abstract The continuous increase in atmospheric methane (CH4) concentrations over the past few decades has become a major concern due to its strong role as a greenhouse gas contributing to climate change. In this work, we investigate the changes in the global methane budget using a global chemistry‐climate model constrained with methane and its ...
Jian He, Vaishali Naik, Larry W. Horowitz   +2 more
wiley   +1 more source

Can conduction induce convection? The non-linear saturation of buoyancy instabilities in dilute plasmas

, 2010
We study the effects of anisotropic thermal conduction on low-collisionality, astrophysical plasmas using two and three-dimensional magnetohydrodynamic simulations.
Balbus, Balbus, Balbus, Balbus, Bogdanović, Braginskii, Chang, Davis, Eliot Quataert, Fromang, Gardiner, George, Ian J. Parrish, Johnson, Lemaster, Michael McCourt, Parrish, Parrish, Parrish, Parrish, Parrish, Parrish, Pfrommer, Piffaretti, Prateek Sharma, Quataert, Ruszkowski, Sharma, Sharma, Sharma, Sharma, Shcherbakov, Spitzer, Stone   +33 more
core   +1 more source

Anthropogenically Stimulated Carbonate Dissolution in the Global Shelf Seafloor Is Potentially an Important and Fast Climate Feedback

AGU Advances, Volume 7, Issue 1, February 2026.
Abstract Carbonate mineral production and dissolution regulate atmospheric carbon dioxide (CO2) concentrations via modulation of the ocean alkalinity content. The anthropogenic rise in atmospheric CO2 reduces calcification rates and enhances calcium carbonate dissolution, which increases ocean alkalinity, counteracts acidification, and stimulates ocean
Sebastiaan J. van de Velde, Pam Vervoort, Robert O. Smith, Cliff S. Law, Kim Currie   +4 more
wiley   +1 more source

Asymmetry, Gap Opening, and a High Accretion Rate on DM Tau: A Hypothesis Based on the Interaction of Magnetized Disk Wind with Planets

The Astrophysical Journal
Over 200 protoplanetary disk systems have been resolved by the Atacama Large Millimeter/submillimeter Array (ALMA), and the vast majority suggest the presence of planets.
Yinhao Wu
doaj   +1 more source

Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence II: Numerical Solution

, 2013
This paper presents the numerical verification of an asymptotic analytical solution for the nonlinear interaction between counterpropagating Alfven waves, the fundamental building block of astrophysical plasma turbulence. The analytical solution, derived
Dorland, William, Howes, Gregory G., Nielson, Kevin D.   +2 more
core   +1 more source