2,958 research outputs found
Results from thinning experiments in 2002 and 2003
In 2002 an experiment about thinning blossoms of the apple variety 'Pinova' lime sulfur (in 2002 45
% thinning) and sodium salt (21 % thinning) showed good effects, the number of blossom-clusters
in 2003 was very high in the lime sulfur parcels. Results from extracts of Hericium erinaceum in
2003 have to be replicated again, the number of applications must be increased
Abrupt and gradual changes of information through the Kane solid state computer
The susceptibility of the transformed information to the filed and system
parameters is investigated for the Kane solid state computer. It has been
shown, that the field polarization and the initial state of the system play the
central roles on the abrupt and gradual quench of the purity and the fidelity.
If the field and the initial state are in different polarizations, then the
purity and the fidelity decrease abruptly, while for the common polarization
the decay is gradual and smooth. For some class of initial states one can send
the information without any loss. Therefore, by controlling on the devices one
can increase the time of safe communication, reduce the amount of exchange
information between the state and its environment and minimize the purity
decrease rate
Showcasing HH production: Benchmarks for the (HL-)LHC
Current projections suggest that the LHC will have only limited sensitivity
to di-Higgs production in the Standard Model (SM), possibly even after the
completion of its high luminosity phase. Multi-Higgs final states play a
fundamental role in many extensions of the SM as they are intrinsically
sensitive to modifications of the Higgs sector. Therefore, any new observation
in multi-Higgs final states could be linked to a range of beyond the SM (BSM)
phenomena that are not sufficiently addressed by the SM. Extensions of the
Higgs sector typically lead to new phenomenological signatures in multi-Higgs
final states that are vastly different from the SM expectation. In this work,
we provide a range of signature-driven benchmark points for resonant and
non-resonant BSM di-Higgs production that motivate non-SM kinematic
correlations and multi-fermion discovery channels. Relying on theoretically
well-motivated assumptions, special attention is devoted to the particular case
where the presence of new physics will dominantly manifest itself in
multi-Higgs final states
Mutually unbiased bases in dimension six: The four most distant bases
We consider the average distance between four bases in dimension six. The
distance between two orthonormal bases vanishes when the bases are the same,
and the distance reaches its maximal value of unity when the bases are
unbiased. We perform a numerical search for the maximum average distance and
find it to be strictly smaller than unity. This is strong evidence that no four
mutually unbiased bases exist in dimension six. We also provide a two-parameter
family of three bases which, together with the canonical basis, reach the
numerically-found maximum of the average distance, and we conduct a detailed
study of the structure of the extremal set of bases.Comment: 10 pages, 2 figures, 1 tabl
Interacting Bosons at Finite Temperature: How Bogolubov Visited a Black Hole and Came Home Again
The structure of the thermal equilibrium state of a weakly interacting Bose
gas is of current interest. We calculate the density matrix of that state in
two ways. The most effective method, in terms of yielding a simple, explicit
answer, is to construct a generating function within the traditional framework
of quantum statistical mechanics. The alternative method, arguably more
interesting, is to construct the thermal state as a vector state in an
artificial system with twice as many degrees of freedom. It is well known that
this construction has an actual physical realization in the quantum
thermodynamics of black holes, where the added degrees of freedom correspond to
the second sheet of the Kruskal manifold and the thermal vector state is a
state of the Unruh or the Hartle-Hawking type. What is unusual about the
present work is that the Bogolubov transformation used to construct the thermal
state combines in a rather symmetrical way with Bogolubov's original
transformation of the same form, used to implement the interaction of the
nonideal gas in linear approximation. In addition to providing a density
matrix, the method makes it possible to calculate efficiently certain
expectation values directly in terms of the thermal vector state of the doubled
system.Comment: 25 pages, LaTeX. To appear in a special issue of Foundations of
Physics in honor of Jacob Bekenstei
Kac-Moody Symmetries of Ten-dimensional Non-maximal Supergravity Theories
A description of the bosonic sector of ten-dimensional N=1 supergravity as a
non-linear realisation is given. We show that if a suitable extension of this
theory were invariant under a Kac-Moody algebra, then this algebra would have
to contain a rank eleven Kac-Moody algebra, that can be identified to be a
particular real form of very-extended D_8. We also describe the extension of
N=1 supergravity coupled to an abelian vector gauge field as a non-linear
realisation, and find the Kac-Moody algebra governing the symmetries of this
theory to be very-extended B_8. Finally, we discuss the related points for the
N=1 supergravity coupled to an arbitrary number of abelian vector gauge fields
Raw-data attacks in quantum cryptography with partial tomography
We consider a variant of the BB84 protocol for quantum cryptography, the
prototype of tomographically incomplete protocols, where the key is generated
by one-way communication rather than the usual two-way communication. Our
analysis, backed by numerical evidence, establishes thresholds for
eavesdropping attacks on the raw data and on the generated key at quantum bit
error rates of 10% and 6.15%, respectively. Both thresholds are lower than the
threshold for unconditional security in the standard BB84 protocol.Comment: 11 pages, 2 figure
E11 and Spheric Vacuum Solutions of Eleven- and Ten dimensional Supergravity Theories
In view of the newly conjectured Kac-Moody symmetries of supergravity
theories placed in eleven and ten dimensions, the relation between these
symmetry groups and possible compactifications are examined. In particular, we
identify the relevant group cosets that parametrise the vacuum solutions of AdS
x S type.Comment: discussion improve
- …