scholarly journals On the magnetic quenching of mean-field effects in supersonic interstellar turbulence

2012 ◽  
Vol 429 (2) ◽  
pp. 967-972 ◽  
Author(s):  
Oliver Gressel ◽  
Abhijit Bendre ◽  
Detlef Elstner
Keyword(s):  
Mean Field ◽  
Interstellar Turbulence ◽  
Field Effects

scholarly journals On the spatial and temporal non-locality of dynamo mean-field effects in supersonic interstellar turbulence

2020 ◽  
Vol 494 (1) ◽  
pp. 1180-1188
Author(s):  
Oliver Gressel ◽  
Detlef Elstner
Keyword(s):  
Large Scale ◽  
Mean Field ◽  
Field Method ◽  
Relevant Parameter ◽  
Test Field ◽  
Surprising Result ◽  
Closure Relation ◽  
Interstellar Turbulence ◽  
Field Effects ◽  
Magnetohydrodynamic Simulations

ABSTRACT The interstellar medium (ISM) of the Milky Way and nearby disc galaxies harbour large-scale coherent magnetic fields of microgauss strength, that can be explained via the action of a mean-field dynamo. As in our previous work, we aim to quantify dynamo effects that are self-consistently emerging in realistic direct magnetohydrodynamic simulations, but we generalize our approach to the case of a non-local (non-instantaneous) closure relation, described by a convolution integral in space (time). To this end, we leverage our comprehensive simulation framework for the supernova-regulated turbulent multiphase ISM. By introducing spatially (temporally) modulated mean fields, we extend the previously used test-field method to the spectral realm – providing the Fourier representation of the convolution kernels. The resulting spectra of the dynamo mean-field coefficients that we obtain broadly match expectations and allow to rigorously constrain the degree of scale separation in the Galactic dynamo. A surprising result is found for the diamagnetic pumping term, which increases in amplitude when going to smaller scales. Our results amount to the most comprehensive description of dynamo mean-field effects in the Galactic context to date. Surveying the relevant parameter space and quenching behaviour, this will ultimately enable the development of assumption-free subgrid prescriptions for otherwise unresolved global galaxy simulations.

Preequilibrium particles and mean-field effects from particle-particle correlations in heavy-ion collisions

1990 ◽  
Vol 514 (3) ◽  
pp. 564-588 ◽  
Author(s):  
D. Ardouin ◽  
Z. Basrak ◽  
P. Schuck ◽  
A. Péghaire ◽  
F. Saint-Laurent ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Mean Field ◽  
Heavy Ion ◽  
Particle Correlations ◽  
Field Effects ◽  
Ion Collisions

Fluctuations and mean field effects in rotational damping

1993 ◽  
Vol 557 ◽  
pp. 181-189
Author(s):  
R.A. Broglia ◽  
P.F. Bortignon ◽  
A. Bracco ◽  
B. Herskind ◽  
S. Leoni ◽  
...  
Keyword(s):  
Mean Field ◽  
Field Effects ◽  
Rotational Damping

Mean-field and beyond mean-field effects on the electronic structure of YBa2Cu3O7

1999 ◽  
Vol 271 (1-4) ◽  
pp. 348-363 ◽  
Author(s):  
M.M Sánchez-López ◽  
J Costa-Quintana ◽  
F López-Aguilar
Keyword(s):  
Electronic Structure ◽  
Mean Field ◽  
Field Effects

scholarly journals Mean field effects in hot compressed nuclear matter

1988 ◽  
Vol 37 (3) ◽  
pp. 1020-1025 ◽  
Author(s):  
J. J. Molitoris ◽  
A. Bonasera ◽  
B. L. Winer ◽  
Horst Stoecker
Keyword(s):  
Nuclear Matter ◽  
Mean Field ◽  
Field Effects

scholarly journals Dynamics of a classical gas including dissipative and mean-field effects

2003 ◽  
Vol 68 (4) ◽  
Author(s):  
P. Pedri ◽  
D. Guéry-Odelin ◽  
S. Stringari
Keyword(s):  
Mean Field ◽  
Field Effects ◽  
Classical Gas
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