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pro vyhledávání: '"Magnano, Guido"'
Autor:
Magnano, Guido
Publikováno v:
International Journal of Geometric Methods in Modern Physics 2450114 (2024)
We discuss the proposal of a new method to transform a f(R) metric gravity theory into a general relativistic theory including an auxiliary scalar field, recently introduced by S. Cotsakis et al. We argue that (i) the fact that the fourth order equat
Externí odkaz:
http://arxiv.org/abs/2308.05854
Autor:
Magnano, Guido, Valsesia, Beniamino
Publikováno v:
Annals of Physics 427 (2021), 168416
We observe that the so-called Generalised Equipartition Law for hamiltonian systems is actually valid only under specific hypotheses -- unfortunately omitted in some textbooks -- which limit its applicability when dealing with nonlinear systems. We i
Externí odkaz:
http://arxiv.org/abs/2009.02518
Autor:
Magnano, Guido, Skrypnyk, Taras
Publikováno v:
SIGMA 16 (2020), 047, 27 pages
We propose a non-standard separation of variables for the classical integrable XXX and XXZ spin chains with degenerate twist matrix. We show that for the case of such twist matrices one can interchange the role of classical separating functions $A(u)
Externí odkaz:
http://arxiv.org/abs/2006.01417
In the framework of alternative metric gravity theories, it has been shown by several authors that a generic Lagrangian depending on the Riemann tensor describes a theory with 8 degrees of freedom (which reduce to 3 for f(R) Lagrangians depending onl
Externí odkaz:
http://arxiv.org/abs/1812.02961
Autor:
Magnano, Guido
The Legendre transformation method, applied in 1987 to deal with purely metric gravitational Lagrangians with nonlinear dependence on the Ricci tensor, is extended to metric-affine models and is shown to provide a concise and insightful comparison of
Externí odkaz:
http://arxiv.org/abs/1601.02235
Autor:
Magnano, Guido
Publikováno v:
International Journal of Geometric Methods in Modern Physics; Jun2025, Vol. 22 Issue 1, p1-10, 10p
Akademický článek
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A new Poisson structure on a subspace of the Kupershmidt algebra is defined. This Poisson structure, together with other two already known, allows to construct a trihamiltonian recurrence for an extension of the periodic Toda lattice with $n$ particl
Externí odkaz:
http://arxiv.org/abs/nlin/0512067
Autor:
Magnano, Guido, Sokolowski, Leszek M.
Publikováno v:
Class. Quantum Grav. 19 (2002) 223-236
We derive a generic identity which holds for the metric (i.e. variational) energy-momentum tensor under any field transformation in any generally covariant classical Lagrangian field theory. The identity determines the conditions under which a symmet
Externí odkaz:
http://arxiv.org/abs/gr-qc/0103072