6,177 research outputs found
Statistical Constraints on the Error of the Leptonic CP Violation of Neutrinos
A constraint on the error of leptonic CP violation, which require the phase
to be less than for it to be distinguishable on a
cycle, is presented. Under this constraint, the effects of neutrino detector 's
distance, beam energy, and energy resolution are discussed with reference to
the present values of these parameters in experiments. Although an optimized
detector performances can minimize the deviation to yield a larger
distinguishable range of the leptonic CP phase on a cycle, it is not
possible to determine an arbitrary leptonic CP phase in the range of
with the statistics from a single detector because of the existence of two
singular points. An efficiency factor is defined to characterize the
distinguishable range of . To cover the entire possible
range, a combined efficiency factor corresponding to
multiple sets of detection parameters with different neutrino beam energies and
distances is proposed. The combined efficiency factors of various
major experiments are also presented.Comment: 9 pages, 5 figure
Superconducting cosmic strings as sources of cosmological fast radio bursts
In this paper we calculate the radio burst signals from three kinds of
structures of superconducting cosmic strings. By taking into account the
observational factors including scattering and relativistic effects, we derive
the event rate of radio bursts as a function of redshift with the theoretical
parameters and of superconducting strings. Our analyses
show that cusps and kinks may have noticeable contributions to the event rate
and in most cases cusps would dominate the contribution, while the kink-kink
collisions tend to have secondary effects. By fitting theoretical predictions
with the normalized data of fast radio bursts, we for the first time constrain
the parameter space of superconducting strings and report that the parameter
space of and fit the observation well although the statistic
significance is low due to the lack of observational data. Moreover, we derive
two types of best fittings, with one being dominated by cusps with a redshift
, and the other dominated by kinks at the range of the maximal event
rate.Comment: 13 pages, 2 figures, 1 table; references update
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