3,963 research outputs found
Reply to "Comment on `Performance of different synchronization measures in real data: A case study on electroencephalographic signals'"
We agree with the Comment by Nicolaou and Nasuto about the utility of mutual information (MI) when properly estimated and we also concur with their view that the estimation based on k nearest neighbors gives optimal results. However, we claim that embedding parameters can indeed change MI results, as we show for the electroencephalogram data sets of our original study and for coupled chaotic systems. Furthermore, we show that proper embedding can actually improve the estimation of MI with the k nearest neighbors algorithm
Constraint on Neutrino Decay with Medium-Baseline Reactor Neutrino Oscillation Experiments
The experimental bound on lifetime of nu_3, the neutrino mass eigenstate with
the smallest nu_e component, is much weaker than those of nu_1 and nu_2 by many
orders of magnitude to which the astrophysical constraints apply. We argue that
the future reactor neutrino oscillation experiments with medium-baseline (~ 50
km), such as JUNO or RENO-50, has the best chance of placing the most stringent
constraint on nu_3 lifetime among all neutrino experiments which utilize the
artificial source neutrinos. Assuming decay into invisible states, we show by a
detailed chi^2 analysis that the nu_3 lifetime divided by its mass, tau_3/m_3,
can be constrained to be tau_3/m_3 > 7.5 (5.5) x 10^{-11} s/eV at 95% (99%)
C.L. by 100 kt.years exposure by JUNO. It may be further improved to the level
comparable to the atmospheric neutrino bound by its longer run. We also discuss
to what extent nu_3 decay affects mass-ordering determination and precision
measurements of the mixing parameters.Comment: 23 pages, 6 figures, clarification of some discussions, added some
references, no change in results and conclusions, version accepted for
publication in JHE
Restrictions on the coherence of the ultrafast optical emission from an electron-hole pairs condensate
We report on the transfer of coherence from a quantum-well electron-hole
condensate to the light it emits. As a function of density, the coherence of
the electron-hole pair system evolves from being full for the low density
Bose-Einstein condensate to a chaotic behavior for a high density BCS-like
state. This degree of coherence is transfered to the light emitted in a damped
oscillatory way in the ultrafast regime. Additionally, the photon field
exhibits squeezing properties during the transfer time. We analyze the effect
of light frequency and separation between electron and hole layers on the
optical coherence. Our results suggest new type of ultrafast experiments for
detecting electron-hole pair condensation.Comment: 4 pages,3 figures, to be published in Physical Review Letters. Minor
change
Vanishing Cosmological Constant in Modified Gauss-Bonnet Gravity with Conformal Anomaly
We consider dark energy cosmology in a de Sitter universe filled with quantum
conformal matter. Our model represents a Gauss-Bonnet model of gravity with
contributions from quantum effects. To the General Relativity action an
arbitrary function of the GB invariant, f(G), is added, and taking into account
quantum effects from matter the cosmological constant is studied. For the
considered model the conditions for a vanishing cosmological constant are
considered. Creation of a de Sitter universe by quantum effects in a GB
modified gravity is discussed.Comment: 8 pages latex, 1 figure. To appear in Int. J. Mod. Phys.
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