2,568 research outputs found
Examining Vietnam’s COVID-19 response
A recent study by Vietnamese social scientists looked into the initial success of Vietnam’s response to COVID-19
Right Handed Neutrino Currents in the SU(3)_LxU(1)_N Electroweak Theory
A version of the \mbox{SU(3)}_L\otimes \mbox{U(1)}_N electroweak theory in
which there are right-handed neutrino currents is reconsidered in detail. We
argue that in order to have a result consistent with low-energy one, the
right-handed neutrino component must be treated as correction instead of an
equivalent spin state. The data from the -decay allow us to fix the limit
for as . From the neutrino neutral
current scattering, we estimate a bound for the new neutral gauge boson
mass in the range of 400 GeV. A bound for the new charged and neutral
(non-Hermitian) gauge bosons is also obtained from
symmetry-breaking hierarchy.Comment: 13 pages, latex, no figures, Presented at the 2nd Recontres du
Vietnam - Physics at the Frontiers of the Standard Model, Ho Chi Minh City,
Vietnam, 21-28 October 199
On a conjecture by Pierre Cartier about a group of associators
In \cite{cartier2}, Pierre Cartier conjectured that for any non commutative
formal power series on with coefficients in a
\Q-extension, , subjected to some suitable conditions, there exists an
unique algebra homomorphism from the \Q-algebra generated by the
convergent polyz\^etas to such that is computed from
Drinfel'd associator by applying to each coefficient. We prove
exists and it is a free Lie exponential over . Moreover, we give a
complete description of the kernel of polyz\^eta and draw some consequences
about a structure of the algebra of convergent polyz\^etas and about the
arithmetical nature of the Euler constant
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