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Mostrando ítems 21-30 de 30501
On the integration of fields and quanta in time dependent backgrounds
(Springer, 2014)
Field theories with global continuous symmetries may admit configurations in
which time translation invariance is broken by the movement of homogeneous background
fields evolving along the flat directions implied by the ...
The arable plant diversity of intensively managed farmland: effects of field position and crop type at local and landscape scales
(Elsevier, 2013-02-14)
Agro-ecosystem biodiversity is threatened by increasing spatial homogenisation of intensively managed farmland. Yet current understanding of patterns of arable plant diversity at various scales remains limited. We evaluated ...
Modular energy inequalities from relative entropy
(Springer, 2018-01)
We obtain new constraints for the modular energy of general states by using the monotonicity property of relative entropy. In some cases, modular energy can be related to the energy density of states and these constraints ...
DIFFUSION OF MAGNETIC FIELD AND REMOVAL OF MAGNETIC FLUX FROM CLOUDS VIA TURBULENT RECONNECTION
(IOP PUBLISHING LTD, 2010)
The diffusion of astrophysical magnetic fields in conducting fluids in the presence of turbulence depends on whether magnetic fields can change their topology via reconnection in highly conducting media. Recent progress ...
Big brake singularity is accommodated as an exotic quintessence field
(American Physical Society, 2015-08)
We describe a big brake singularity in terms of a modified Chaplygin gas equation of state $p=(ga_{m}-1)ho+alga_{m}ho^{-n}$, accommodate this late-time event as an exotic quintessence model obtained from an energy-momentum ...
Comments on regularization of identity based solutions in string field theory
(SPRINGER, 2010)
We analyze the consistency of the recently proposed regularization of an identity based solution in open bosonic string field theory. We show that the equation of motion is satisfied when it is contracted with the regularized ...
Piecewise smooth vector fields in ℝ3 at infinity
(2014-11-25)
In this work we study the dynamics at infinity of a piecewise smooth vector fields in ℝ3. We provide conditions for the 24-parameter family to undergo a local bifurcations of codimension zero and one at infinity. These ...
Evidence for anomalous cowling conductivity in the strongly driven equatorial electrojet and a reconciliation of magnetic field data with theory
(2009-08)
Several days of continuous incoherent scatter radar observations during the November 2004 magnetic superstorm are available, as well as data from the CHAMP [CHAllenging Minisatellite Payload] satellite magnetic fiel d ...