21 citations · 72 across the 13 of their papers we have counts for
13 papers
Permutation group entropy: a new route to complexity for real-valued processes
José M. Amigó, Roberto Dale, Piergiulio Tempesta
This is a review of group entropy and its application to permutation complexity. Specifically we revisit a new approach to the notion of complexity in time serie analysis, based on…
Interpreting deviations between AR-VTG and GR
Roberto Dale, Diego Sáez
The Cosmic microwave background (CMB) anisotropies predicted by two cosmological models are compared, one of them is the standard model of general relativity with cold dark matter…
Vector Field Dynamics: Field Equations and Energy Tensor
Roberto Dale, Alicia Herrero, Juan Antonio Morales-Lladosa
Relativistic field theory for a vector field on a curved space-time is considered assuming that the Lagrangian field density is quadratic and contains field derivatives of first or…
Cosmic primordial density fluctuations and Bell inequalities
Roberto Dale, Ramon Lapiedra, Juan Antonio Morales-Lladosa
The temperature measurements, , of the perturbed cosmic microwave background, performed by the cosmic background explorer satellite (COBE), are considered. A dichotomist functio…
Essential Fierz identities for a fermionic field
Roberto Dale, Alicia Herrero, Juan Antonio Morales-Lladosa
For a single fermionic field, an interpretation of the Fierz identities (which establish relations between the bilinear field observables) is given. They appear closely related to…
Spherical symmetric dust collapse in a Vector-Tensor gravity
R. Dale, D. Sáez
There is a viable vector-tensor gravity (VTG) theory, whose vector field produces repulsive forces leading to important effects. In the background universe, the effect of these for…
A generalized permutation entropy for random processes
José M. Amigó, Roberto Dale, Piergiulio Tempesta
Permutation entropy measures the complexity of deterministic time series via a data symbolic quantization consisting of rank vectors called ordinal patterns or just permutations. T…
More about a successful vector-tensor theory of gravitation
Roberto Dale, Diego Sáez
The vector-tensor (VT) theory of gravitation revisited in this article was studied in previous papers, where it was proved that VT works and deserves attention. New observational d…
On the horizons in a viable vector-tensor theory of gravitation
Roberto Dale, Màrius J. Fullana, Diego Sáez
A certain vector-tensor (VT) theory of gravitation was tested in previous papers. In the background universe, the vector field of the theory has a certain energy density, which is…
Cosmology in a certain vector-tensor theory of gravitation
Roberto Dale, Diego Sáez
We study relevant cosmological topics in the framework of a certain vector-tensor theory of gravitation (hereafter VT). This theory is first compared with the so-called extended el…
Cosmological perturbations in extended electromagnetism. General gauge invariant approach
Roberto Dale, Diego Sáez
A certain vector-tensor (VT) theory is revisited. It was proposed and analyzed as a theory of electromagnetism without the standard gauge invariance. Our attention is first focused…
On the viability of a certain vector-tensor theory of gravitation
R. Dale, D. Saez
A certain vector-tensor theory is revisited. Our attention is focused on cosmology. Against previous suggestions based on preliminary studies, it is shown that, if the energy densi…
Proposal for the origin of the cosmological constant
R. Dale, J. A. Morales-Lladosa, D. Saez
We work in the framework of a simple vector-tensor theory. The parametrized post-Newtonian approximation of this theory is identical to that of general relativity. Our attention is…