2,737 research outputs found
Fully differential Vector-Boson Fusion Higgs Pair Production at Next-to-Next-to-Leading Order
We calculate the fully differential next-to-next-to-leading order (NNLO) QCD
corrections to vector-boson fusion (VBF) Higgs pair production. This
calculation is achieved in the limit in which there is no colored cross-talk
between the colliding protons, using the projection-to-Born method. We present
differential cross sections of key observables, showing corrections of up to
3-4% at this order after typical VBF cuts, with the total cross section
receiving contributions of about 2%. In contrast to single Higgs VBF
production, we find that the NNLO corrections are for the most part within the
next-to-leading order scale uncertainty bands.Comment: 5 pages, 3 figures, updated to match published versio
New developments in the theory of Groebner bases and applications to formal verification
We present foundational work on standard bases over rings and on Boolean
Groebner bases in the framework of Boolean functions. The research was
motivated by our collaboration with electrical engineers and computer
scientists on problems arising from formal verification of digital circuits. In
fact, algebraic modelling of formal verification problems is developed on the
word-level as well as on the bit-level. The word-level model leads to Groebner
basis in the polynomial ring over Z/2n while the bit-level model leads to
Boolean Groebner bases. In addition to the theoretical foundations of both
approaches, the algorithms have been implemented. Using these implementations
we show that special data structures and the exploitation of symmetries make
Groebner bases competitive to state-of-the-art tools from formal verification
but having the advantage of being systematic and more flexible.Comment: 44 pages, 8 figures, submitted to the Special Issue of the Journal of
Pure and Applied Algebr
Observation of Mammalian Similarity Through Allometric Scaling Laws
We discuss the problem of observation of natural similarity in skeletal
evolution of terrestrial mammals. Analysis is given by means of testing of the
power scaling laws established in long bone allometry, which describe
development of bones (of length and diameter ) with body mass in terms
of the growth exponents, \QTR{it}{e.g.} . The
bone-size evolution scenario given three decades ago by McMahon was quiet
explicit on the geometrical-shape and mechanical-force constraints that
predicted . This remains too far from the mammalian allometric
exponent , recently revised by Christiansen,
that is a chief puzzle in long bone allometry. We give therefore new insights
into McMahon's constraints and report on the first observation of the
critical-elastic-force, bending-deformation, muscle-induced mechanism that
underlies the allometric law with estimated . This
mechanism governs the bone-size evolution with avoiding skeletal fracture
caused by muscle-induced peak stresses and is expected to be unique for small
and large mammals.Comment: Keywords: allometric scaling, long bones, muscles, mammals 21 pages,
1 Table, 2 Figure
Vector-Boson Fusion Higgs Pair Production at NLO
We calculate the next-to-next-to-next-to-leading order (NLO) QCD
corrections to vector-boson fusion (VBF) Higgs pair production in the limit in
which there is no partonic exchange between the two protons. We show that the
inclusive cross section receives negligible corrections at this order, while
the scale variation uncertainties are reduced by a factor four. We present
differential distributions for the transverse momentum and rapidity of the
final state Higgs bosons, and show that there is almost no kinematic dependence
to the third order corrections. Finally we study the impact of deviations from
the Standard Model in the trilinear Higgs coupling, and show that the structure
of the higher order corrections does not depend on the self-coupling. These
results are implemented in the latest release of the proVBFH-incl program.Comment: 10 pages, 9 figures, updated to match published versio
Micro-macro transitions in the atomic chain via Whitham's modulation equation
The subject matter of this paper is the thermodynamic description of the nonlinear atomic chain with temperature. For this reason we consider special approximate solutions of Newton's equations, in which the atoms perform microscopic oscillations in form of modulated traveling waves. We start with an existence result for periodic traveling wave with arbitrary large amplitudes, and study several examples including the harmonic chain, the hard sphere model, and the small-amplitude approximation. Then we discuss the thermodynamic properties of traveling waves, and derive the corresponding Gibbs equation. Afterwards we focus on the macroscopic evolution of modulated traveling waves. For this purpose we apply Whitham's modulation theory to the atomic chain, and derive the modulation equation, which turns out to be a system of four macroscopic conservation laws. The last part is devoted to the justification problem: We state a conjecture for the general case, and prove this conjecture for the harmonic chain and the hard sphere model
Continuous Non-Intrusive Hybrid WCET Estimation Using Waypoint Graphs
Traditionally, the Worst-Case Execution Time (WCET) of Embedded Software has been estimated using analytical approaches. This is effective, if good models of the processor/System-on-Chip (SoC) architecture exist. Unfortunately, modern high performance SoCs often contain unpredictable and/or undocumented components that influence the timing behaviour. Thus, analytical results for such processors are unrealistically pessimistic. One possible alternative approach seems to be hybrid WCET analysis, where measurement data together with an analytical approach is used to estimate worst-case behaviour. Previously, we demonstrated how continuous evaluation of basic block trace data can be used to produce detailed statistics of basic blocks in embedded software. In the meantime it has become clear that the trace data provided by modern SoCs delivers a different type of information. In this contribution, we show that even under realistic conditions, a meaningful analysis can be conducted with the trace data
Blow-up versus boundedness in a nonlocal and nonlinear Fokker--Planck equation
We consider a Fokker-Planck equation on a compact interval where, as a constraint, the first moment is a prescribed function of time. Eliminating the associated Lagrange multiplier one obtains nonlinear and nonlocal terms. After establishing suitable local existence results, we use the relative entropy as an energy functional. However, the time-dependent constraint leads to a source term such that a delicate analysis is needed to show that the dissipation terms are strong enough to control the work done by the constraint. We obtain global existence of solutions as long as the prescribed first moment stays in the interior of an interval. If the prescribed moment converges to a constant value inside the interior of the interval, then the solution stabilises to the unique steady state
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Blow-up versus boundedness in a nonlocal and nonlinear Fokker-Planck equation
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