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12 papers · 2 filters
Dynamics of Sleep-Wake Transitions During Sleep
Chung-Chuan Lo, Luis A. Nunes Amaral, Shlomo Havlin +4
We study the dynamics of the awakening during the night for healthy subjects and find that the wake and the sleep periods exhibit completely different behavior: the durations of wa…
Critical behavior of certain antiferromagnets with complicated ordering: Four-loop $\ve$-expansion analysis
Andrei Mudrov, Konstantin Varnashev
The critical behavior of a complex N-component order parameter Ginzburg-Landau model with isotropic and cubic interactions describing antiferromagnetic and structural phase transit…
Ferromagnetic transition in a double-exchange system containing impurities in the Dynamical Mean Field Approximation
Mark Auslender, Eugene Kogan
We formulate the Dynamical Mean Field Approximation equations for the double-exchange system with quenched disorder for arbitrary relation between Hund exchange coupling and electr…
Correlation Differences in Heartbeat Fluctuations During Rest and Exercise
Roman Karasik, Nir Sapir, Yosef Ashkenazy +4
We study the heartbeat activity of healthy individuals at rest and during exercise. We focus on correlation properties of the intervals formed by successive peaks in the pulse wave…
On critical behavior of phase transitions in certain antiferromagnets with complicated ordering
Andrei Mudrov, Konstantin Varnashev
Within the four-loop $\ve$ expansion, we study the critical behavior of certain antiferromagnets with complicated ordering. We show that an anisotropic stable fixed point governs t…
Critical thermodynamics of three-dimensional MN-component field model with cubic anisotropy from higher-loop εexpansion
Andrei Mudrov, Konstantin Varnashev
The critical thermodynamics of an -component field model with cubic anisotropy relevant to the phase transitions in certain crystals with complicated ordering is studied within…