2.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR835 papers
- The Ohio State UniversityUS812 papers
- Universidade de São PauloBR798 papers
- Panjab UniversityIN636 papers
- Universidade Federal do ABCBR635 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di TorinoIT634 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR603 papers
- Benemérita Universidad Autónoma de PueblaMX594 papers
- European Organization for Nuclear ResearchCH583 papers
- Wayne State UniversityUS576 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT570 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di CataniaIT565 papers
43 papers · 1 filter
Superinflation, quintessence, and nonsingular cosmologies
E. Gunzig, A. Saa, L. Brenig +3
The dynamics of a universe dominated by a self-interacting nonminimally coupled scalar field are considered. The structure of the phase space and complete phase portraits are given…
Supernova Neutrino Oscillations
H. Nunokawa
We discuss some possible influence of neutrino oscillations on physics of supernova mainly focusing on the observations of , and present some analysis of SN1987A data in t…
Violation of Equivalence Principle and Solar Neutrinos
A. M. Gago, H. Nunokawa, R. Zukanovich Funchal
We have updated the analysis for the solution to the solar neutrino problem by the long-wavelength neutrino oscillations induced by a tiny breakdown of the weak equivalence princip…
On the massless "just-so" solution to the solar neutrino problem
M. M. Guzzo, H. Nunokawa, P. C. de Holanda +1
We study the effect of the non-resonant, vacuum oscillation-like neutrino flavor conversion induced by non-standard flavor changing and non-universal flavor diagonal neutrino inter…
Causal explanation for observed superluminal behavior of microwave propagation in free space
W. A. Rodrigues, Dario S. Thober, Ademir L. Xavier
In this paper we present a theoretical analysis of an experiment by Mugnai and collaborators where superluminal behavior was observed in the propagation of microwaves. We suggest t…
Insulator-to-metal crossover induced by local spin fluctuations in strongly correlated systems
Luis Craco
We study the simplified Hubbard (SH) model in the presence of a transverse field in the infinite dimension limit. The relevant one-particle Green's functions of the model are obtai…
Magnetic properties of the frustrated AFM spinel ZnCr_2O_4 and the spin-glass Zn_{1-x}Cd_xCr_2O_4 (x=0.05,0.10)
H. Martinho, N. O. Moreno, J. A. Sanjurjo +9
The -dependence (2- 400 K) of the electron paramagnetic resonance (EPR), magnetic susceptibility, , and specific heat, , of the antiferromagnetic (AFM)…
Griffiths phase of the Kondo insulator fixed point
E. Miranda, V. Dobrosavljevic
Heavy fermion compounds have long been identified as systems which are extremely sensitive to the presence of impurities and other imperfections. In recent years, both experimental…
(3+1)-spectrum of neutrino masses: A chance for LSND?
O. L. G. Peres, A. Yu. Smirnov
If active to active neutrino transitions are dominant modes of the atmospheric () and the solar neutrino oscillations (), as is indicated by recent d…
Mixmaster chaos
A. E. Motter, P. S. Letelier
The significant discussion about the possible chaotic behavior of the mixmaster cosmological model due to Cornish and Levin [J.N. Cornish and J.J. Levin, Phys. Rev. Lett. 78 (1997)…
Hausdorff dimension of repellors in low sensitive systems
A. E. Motter, P. S. Letelier
Methods to estimate the Hausdorff dimension of invariant sets of scattering systems are presented. Based on the levels' hierarchical structure of the time delay function, these tec…
Inverted Hierarchy of Neutrino Masses Disfavored by Supernova 1987A
Hisakazu Minakata, Hiroshi Nunokawa
We discuss the flavor conversion of supernova neutrinos in the three-flavor mixing scheme of neutrinos. We point out that by neutrino observation from supernova one can discriminat…
Status of the solutions to neutrino anomalies based on non-standard neutrino interactions
Hiroshi Nunokawa
We review the status of the solutions to neutrino anomalies by flavor-changing as well as flavor-diagonal neutrino interactions. While it is difficult to explain the atmospheric ne…
Measuring CP violation by low-energy medium-baseline neutrino oscillation experiments
Hisakazu Minakata, Hiroshi Nunokawa
In this talk we discuss the possibility to measure CP violation in neutrino oscillation experiments using the neutrino beam with energy which is lower (E_ν\gsim 100 MeV) than the o…
Unexpected behavior in 3He films and the theory of fermions in two dimensions
Paulo F. Farinas
It is shown that the recently observed and unexplained behavior for the spin diffusion in 3He films can be understood in terms of the Fermi liquid theory, provided nonperturbative…
On the genus of a maximal curve
Gabor Korchmaros, Fernando Torres
Previous results on genera g of F_{q^2}-maximal curves are improved: (1) Either g\leq (q^2-q+4)/6, or g=\lfloor(q-1)^2/4\rfloor, or g=q(q-1)/2; (2) The hypothesis on the existence…
Precursory Metal-Insulator transition in a small cluster of the `t-J' model: Exact analytic results
R de Sousa, G G Cabrera
We study the effect of hole hopping in a doped antiferromagnet described by the `t-J' model, using exact analytic solutions for small clusters. In spite of the small size, they rev…
Uncertainty Relations for Entangled States
G. Rigolin
A generalized uncertainty relation for an entangled pair of particles is obtained if we impose a symmetrization rule for all operators that we should use when doing any calculation…
Three Generation Long-wavelength Vacuum Oscillation Solution to the Solar Neutrino Problem
A. M. Gago, H. Nunokawa, R. Zukanovich Funchal
We investigate the current status of the long-wavelength vacuum oscillation solution to the solar neutrino problem and to what extent the presence of a third neutrino can affect an…
Role of Orbital Degeneracy in Double Exchange Systems
M. S. Laad, L. Craco, E. Müller-Hartmann
We investigate the role of orbital degeneracy in the double exchange (DE) model. In the limit, an effective generalized ``Hubbard'' model incorporating orbital pse…
Electron Energy Loss Spectroscopy of strongly correlated systems in infinite dimensions
Luis Craco, Mukul S. Laad
We study the electron-energy loss spectra of strongly correlated electronic systems doped away from half-filling using dynamical mean-field theory (). The formalism can b…
Theory of Magnetic Anisotropy in III_{1-x}Mn_{x}V Ferromagnets
M. Abolfath, T. Jungwirth, J. Brum +1
We present a theory of magnetic anisotropy in diluted magnetic semiconductors with carrier-induced ferromagnetism. The theory is based on four…
Scars of the Wigner function
Fabricio Toscano, Marcus A. M. de Aguiar, Alfredo M. Ozorio de Almeida
We propose a picture of Wigner function scars as a sequence of concentric rings along a two-dimensional surface inside a periodic orbit. This is verified for a two-dimensional plan…
Regge Analysis of Diffractive and Leading Baryon Structure Functions from DIS
M. Batista, R. J. M. Covolan, J. Montanha
In this paper we present a combined analysis of the H1 data on leading baryon and diffractive structure functions from DIS, which are handled as two components of the same semi-inc…