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- E Romera, J S Dehesa
- The Journal of chemical physics
- 2004

A new correlation measure, the product of the Shannon entropy power and the Fisher information of the electron density, is introduced by analyzing the Fisher-Shannon information plane of some two-electron systems (He-like ions, Hooke's atoms). The uncertainty and scaling properties of this information product are pointed out. In addition, the Fisher and… (More)

Our aim in this paper is twofold. First, to find the necessary and sufficient conditions to be satisfied by a given sequence of real numbers $vn%n50 ` to represent the ‘‘entropic moments’’ * [0,a]@r(x)# dx of an unknown non-negative, decreasing and differentiable ~a.e.! density function r(x) with a finite interval support. These moments are called entropic… (More)

- E Romera
- 2002

Several D-dimensional uncertainty-like relationships for N-body systems are obtained by means of the Fisher’s information entropies in position and momentum spaces and the Stam’s uncertainty principle. In addition, these relationships, the Fisher’s entropies and the Stam’s inequality are analysed numerically for all ground state neutral atoms from hydrogen… (More)

- Ricardo López-Ruiz, Jaime Sanudo, Elvira Romera, Xavier Calbet
- ArXiv
- 2011

In this chapter, a statistical measure of complexity and the FisherShannon information product are introduced and their properties are discussed. These measures are based on the interplay between the Shannon information, or a function of it, and the separation of the set of accessible states to a system from the equiprobability distribution, i.e. the… (More)

- Ricardo López-Ruiz, A. Nagy, Elvira Romera, Jaime Sanudo
- ArXiv
- 2009

to quantum systems R. López-Ruiz, Á. Nagy, E. Romera, and J. Sañudo DIIS and BIFI, Facultad de Ciencias, Universidad de Zaragoza, E-50009 Zaragoza, Spain Department of Theoretical Physics, University of Debrecen, H-4010 Debrecen, Hungary Departamento de Física Atómica, Molecular y Nuclear and Instituto Carlos I de Física Teórica y Computacional, Universidad… (More)

- E. Romera, J. C. Angulo
- 1999

General model-independent relationships among radial expectation values of the one-particle densities in position and momentum spaces for any quantum-mechanical system are obtained. They are derived from the Stam uncertainty principle and the recently reported lower bounds to the Fisher information entropy of both densities. The results are usually… (More)

- Francisco de Los Santos, Elvira Romera, Omar Al Hammal, Miguel Angel Muñoz
- Physical review. E, Statistical, nonlinear, and…
- 2007

A self-consistent mean-field method is used to study critical wetting transitions under nonequilibrium conditions by analyzing Kardar-Parisi-Zhang (KPZ) interfaces in the presence of a bounding substrate. In the case of positive KPZ nonlinearity a single (Gaussian) regime is found. On the contrary, interfaces corresponding to negative nonlinearities lead to… (More)

- Trinidad García, Salvador Rodríguez-Bolívar, Nicolás A Cordero, Elvira Romera
- Journal of physics. Condensed matter : an…
- 2013

We have studied the existence of quantum revivals in graphene quantum rings within a simplified model. The time evolution of a Gaussian-populated wavepacket shows revivals in monolayer and bilayer graphene rings. We have also studied this behavior for quantum rings in a perpendicular magnetic field. We have found that revival time is an observable that… (More)

- Elvira Romera
- 2002

Electron-pair uncertainty relationships of generalized Heisenberg type in quantum mechanics are formulated. They express restrictions imposed by quantum theory on the electron-pair intracule (relative motion) and extracule (centre-of-mass motion) densities in the two complementary spaces by means of the corresponding statistical moments. These relations are… (More)

The nonidempotency measure of Löwdin is found to be proportional to the disequilibrium. It is shown that there exists a simple relationship between the LMC (López-Ruiz-Mancini-Calbet) and the generalized statistical complexities and the generalized nonidempotency measure of Löwdin. Results are illustrated for an exactly solvable two-electron model atom.