3 research outputs found
Galactic Neutrino Communication
We examine the possibility to employ neutrinos to communicate within the
galaxy. We discuss various issues associated with transmission and reception,
and suggest that the resonant neutrino energy near 6.3 PeV may be most
appropriate. In one scheme we propose to make Z^o particles in an overtaking
e^+ - e^- collider such that the resulting decay neutrinos are near the W^-
resonance on electrons in the laboratory. Information is encoded via time
structure of the beam. In another scheme we propose to use a 30 PeV pion
accelerator to create neutrino or anti-neutrino beams. The latter encodes
information via the particle/anti-particle content of the beam, as well as
timing. Moreover, the latter beam requires far less power, and can be
accomplished with presently foreseeable technology. Such signals from an
advanced civilization, should they exist, will be eminently detectable in
neutrino detectors now under construction.Comment: 6 pages, 2 figures. Minor corrections, references adde
Reflectionless Potentials for Difference Schr\"odinger Equations
As a part of the program `discrete quantum mechanics,' we present general
reflectionless potentials for difference Schr\"odinger equations with pure
imaginary shifts. By combining contiguous integer wave number reflectionless
potentials, we construct the discrete analogues of the
potential with the integer , which belong to the recently constructed
families of solvable dynamics having the -ultraspherical polynomials with
as the main part of the eigenfunctions. For the general
() scattering theory for these potentials, we need the
connection formulas for the basic hypergeometric function
with , which is not known.
The connection formulas are expected to contain the quantum dilogarithm
functions as the counterparts of the -gamma functions. We propose a
conjecture of the connection formula of the function with .
Based on the conjecture, we derive the transmission and reflection amplitudes,
which have all the desirable properties. They provide a strong support to the
conjectured connection formula.Comment: 24 pages. Comments and references added. To appear in J. Phys.