5,785 research outputs found
An effective criterion for Eulerian multizeta values in positive characteristic
Characteristic p multizeta values were initially studied by Thakur, who
defined them as analogues of classical multiple zeta values of Euler. In the
present paper we establish an effective criterion for Eulerian multizeta
values, which characterizes when a multizeta value is a rational multiple of a
power of the Carlitz period. The resulting "t-motivic" algorithm can tell
whether any given multizeta value is Eulerian or not. We also prove that if
zeta_A(s_1,...,s_r) is Eulerian, then zeta_A(s_2,...,s_r) has to be Eulerian.
When r=2, this was conjectured (and later on conjectured for arbitrary r) by
Lara Rodriguez and Thakur for the zeta-like case from numerical data. Our
methods apply equally well to values of Carlitz multiple polylogarithms at
algebraic points and zeta-like multizeta values.Comment: 32 page
Frobenius difference equations and algebraic independence of zeta values in positive equal characteristic
In analogy with the Riemann zeta function at positive integers, for each
finite field F_p^r with fixed characteristic p we consider Carlitz zeta values
zeta_r(n) at positive integers n. Our theorem asserts that among the zeta
values in {zeta_r(1), zeta_r(2), zeta_r(3), ... | r = 1, 2, 3, ...}, all the
algebraic relations are those algebraic relations within each individual family
{zeta_r(1), zeta_r(2), zeta_r(3), ...}. These are the algebraic relations
coming from the Euler-Carlitz relations and the Frobenius relations. To prove
this, a motivic method for extracting algebraic independence results from
systems of Frobenius difference equations is developed.Comment: 14 page
Algebraic independence of arithmetic gamma values and Carlitz zeta values
We consider the values at proper fractions of the arithmetic gamma function
and the values at positive integers of the zeta function for F_q[theta] and
provide complete algebraic independence results for them.Comment: 15 page
Two Photon Transition Form Factor of Quarkonia
The two photon transition of quarkonia are studied within a
covariant approach based on the consistent truncation scheme of the quantum
chromodynamics Dyson-Schwinger equation for the quark propagator and the
Bethe--Salpeter equation for the mesons. We find the decay widths of
and in good
agreement with experimental data. The obtained transition form factor of
for a wide range of space-like photon
momentum transfer squared is also in agreement with the experimental findings
of the BABAR experiment. As a by-product, the decay widths of
and the transition form factor of
are predicted, which
await for experimental test
(3R,3aS,6R,6aR)-3-(1-NitroÂethÂyl)perhydroÂfuro[3,2-b]furan-3,6-diol
The molÂecule of the title compound, C8H13NO6, a sucrose derivative, consists of two fused tetraÂhydroÂfuran rings having the cis arrangement at the ring junctions, giving a V-shaped molÂecule. An intraÂmolecular O—H⋯O interÂaction occurs. InterÂmolecular O—H⋯O hydrogen bonds help to stabilize the crystal structure
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