2,326 research outputs found
On Heegner points of large conductors
Given a parametrisation of an elliptic curve over Q by a Shimura curve, we
show that the images of almost all Heegner points are of infinite order. For
parametrisations of elliptic curves by modular curves this was proven earlier
by Nekovar and Schappacher by a different method
The density of ramified primes in semisimple p-adic Galois representations
We prove that the density of ramified primes in semisimple p-adic
representations of Galois groups of number fields is 0. Ravi Ramakrishna has
produced examples of such representations that are infinitely ramified
Long wavelength ultraviolet photoproduction of amino acids on the primitive earth
Amino acids produced by long UV irradiation of gas mixtures using hydrogen sulfide as initial photon acceptor, simulating prebiological earth condition
Exobiology and the origin of life
Abstracts on planetary studies and the search for extraterrestrial life are presented. Studies of the Jovian atmosphere were conducted. An assessment of the prospects for life on Mars is presented. And, the the means of contacting extraterrestrial civilizations is discussed
On the temperature dependence of possible S8 infrared bands in planetary atmospheres
Measurements of the temperature dependence between 77 and 333 K of the infrared spectrum of cyclic octatomic sulfur are reported. It is suggested that the 23 micrometer Jovian feature is not due to 3 sub 8 and that the temperature dependence of the frequency of the 835/cm band of S sub 8 may be a useful temperature marker in planetary studies
On Some One-Parameter Families of Three-Body Problems in One Dimension: Exchange Operator Formalism in Polar Coordinates and Scattering Properties
We apply the exchange operator formalism in polar coordinates to a
one-parameter family of three-body problems in one dimension and prove the
integrability of the model both with and without the oscillator potential. We
also present exact scattering solution of a new family of three-body problems
in one dimension.Comment: 10 pages, LaTeX, no figur
New Shape Invariant Potentials in Supersymmetric Quantum Mechanics
Quantum mechanical potentials satisfying the property of shape invariance are
well known to be algebraically solvable. Using a scaling ansatz for the change
of parameters, we obtain a large class of new shape invariant potentials which
are reflectionless and possess an infinite number of bound states. They can be
viewed as q-deformations of the single soliton solution corresponding to the
Rosen-Morse potential. Explicit expressions for energy eigenvalues,
eigenfunctions and transmission coefficients are given. Included in our
potentials as a special case is the self-similar potential recently discussed
by Shabat and Spiridonov.Comment: 8pages, Te
Linear Superposition in Nonlinear Equations
Even though the KdV and modified KdV equations are nonlinear, we show that
suitable linear combinations of known periodic solutions involving Jacobi
elliptic functions yield a large class of additional solutions. This procedure
works by virtue of some remarkable new identities satisfied by the elliptic
functions.Comment: 7 pages, 1 figur
New supersymmetric partners for the associated Lame potentials
We obtain exact solutions of the one-dimensional Schrodinger equation for
some families of associated Lame potentials with arbitrary energy through a
suitable ansatz, which may be appropriately extended for other such a families.
The formalism of supersymmetric quantum mechanics is used to generate new
exactly solvable potentials.Comment: 8 pages, 2 figures, submitted on 24 November 2004 to Phys. Lett.
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