Zobrazeno 1 - 10
of 311
pro vyhledávání: '"Toller M"'
Autor:
Toller, M.
Publikováno v:
J.Math.Phys. 47 (2006) 022904
We consider a classical test particle subject to electromagnetic and gravitational fields, described by a Lagrangian depending on the acceleration and on a fundamental length. We associate to the particle a moving local reference frame and we study i
Externí odkaz:
http://arxiv.org/abs/hep-th/0510030
Autor:
Toller, M.
We discuss the nature and a general formulation of the relativity principle and we show that it can be justified starting from a strictly operational point of view. We give some remark on the connection with the spacetime symmetry groups. We also pro
Externí odkaz:
http://arxiv.org/abs/physics/0504133
Autor:
Toller, M.
We discuss some Lagrangian and presymplectic models concerning test particles in electromagnetic and gravitational fields, with the aim of describing an upper bound to the acceleration. Some models are based on the relativistic phase space and others
Externí odkaz:
http://arxiv.org/abs/hep-th/0409317
Autor:
Toller, M.
We discuss and compare several geometric structures which imply an upper bound to the acceleration of a particle measured in its rest system. While all of them have the same implications on the motion of a point particle, they differ in other importa
Externí odkaz:
http://arxiv.org/abs/hep-th/0312016
Autor:
Toller, M.
Publikováno v:
Phys.Rev.D70:024006,2004
We treat the events determined by a quantum physical state in a noncommutative space-time, generalizing the analogous treatment in the usual Minkowski space-time based on positive-operator-valued measures (POVMs). We consider in detail the model prop
Externí odkaz:
http://arxiv.org/abs/hep-th/0305121
Autor:
Toller, M.
Publikováno v:
Mod.Phys.Lett. A18 (2003) 2019
Motivated by ultra-high-energy cosmic ray physics, we discuss all the possible alternatives to the familiar Lorentz transformations of the momentum and the energy of a particle. Starting from natural physical requirements, we exclude all the possibil
Externí odkaz:
http://arxiv.org/abs/hep-th/0301153
Autor:
Toller, M.
We present a classification, up to isomorphisms, of all the homogeneous spaces of the Lorentz group with dimension lower than six. At the same time, we classify, up to conjugation, all the non-discrete closed subgroup of the Lorentz group and all the
Externí odkaz:
http://arxiv.org/abs/math-ph/0301014
Autor:
Toller, M.
We discuss the possibility of explaining the observation of ultra-high-energy cosmic rays with energy above the GZK cutoff, saving the relativity principle and the (possibly deformed) Lorentz symmetry, as proposed recently by several authors. Since i
Externí odkaz:
http://arxiv.org/abs/hep-ph/0211094
Autor:
Pinamonti, N., Toller, M.
We study the positive-operator-valued measures on the projective real line covariant with respect to the projective group, assuming that the energy is a positive operator. This problem is similar to the more complicated problem of finding the positiv
Externí odkaz:
http://arxiv.org/abs/quant-ph/0001109
Autor:
Toller, M.
Publikováno v:
Int.J.Theor.Phys. 38 (1999) 2015-2028
We study the variances of the coordinates of an event considered as quantum observables in a Poincare' covariant theory. The starting point is their description in terms of a covariant positive-operator-valued measure on the Minkowski space-time. Bes
Externí odkaz:
http://arxiv.org/abs/quant-ph/9807059