A new Lie algebra expansion method: Galilei expansions to Poincare and Newton-Hooke
We modify a Lie algebra expansion method recently introduced for the (2+1)-dimensional kinematical algebras so as to work for higher
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Santander
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Comment to the paper "In-plane spectral weight shift of charge-carriers in YBa2Cu3O(6.9)" by A. V. Boris et al., Science 304, p. 708 (2004)
Recently, A. V. Boris and colleagues claimed to deduce a decrease of intraband spectral weight (SW), and a transfer of
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Sum rules and energy scales in BiSrCaCuO
From very high accuracy reflectivity spectra, we have derived the optical conductivity and estimated the spectral weight up to various
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The families of orthogonal, unitary and quaternionic unitary Cayley--Klein algebras and their central extensions
The families of quasi-simple or Cayley--Klein algebras associated to antihermitian matrices over R, C and H are described in a
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Two important examples of nonlinear oscillators
We discuss a classical nonlinear oscillator, which is proved to be a superintegrable system for which the bounded motions are
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Igloo Pixelizations
Upcoming microwave background experiments will see an incredible increase in the volume of data to be analyzed, which makes the
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