1,012 research outputs found
Saturation effects in forward-forward dijet production in p+Pb collisions
We study saturation effects in the production of forward dijets in
proton-lead collisions at the Large Hadron Collider, using the framework of
High Energy Factorization. Such configurations, with both jets produced in the
forward direction, probe the gluon density of the lead nucleus at small
longitudinal momentum fraction, and also limit the phase space for emissions of
additional jets. We find significant suppression of the forward dijet azimuthal
correlations in proton-lead versus proton-proton collisions, which we attribute
to stronger saturation of the gluon density in the nucleus than in the proton.
In order to minimize model dependence of our predictions, we use two different
extensions of the Balitsky-Kovchegov equation for evolution of the gluon
density with sub-leading corrections.Comment: 13 pages, 4 figures; v2: added figure 4, several clarifying sentences
and a reference; version accepted by PR
Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework
We study the production of forward di-jets in proton-lead and proton-proton
collisions at the Large Hadron Collider. Such configurations, with both jets
produced in the forward direction, impose a dilute-dense asymmetry which allows
to probe the gluon density of the lead or proton target at small longitudinal
momentum fractions. Even though the jet momenta are always much bigger than the
saturation scale of the target, , the transverse momentum imbalance of the
di-jet system may be either also much larger than , or of the order ,
implying that the small- QCD dynamics involved is either linear or
non-linear, respectively. The small- improved TMD factorization framework
deals with both situation in the same formalism. In the latter case, which
corresponds to nearly back-to-back jets, we find that saturation effects induce
a significant suppression of the forward di-jet azimuthal correlations in
proton-lead versus proton-proton collisions.Comment: 6 figure
Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions
We study forward dijet production in dilute-dense hadronic collisions. By
considering the appropriate limits, we show that both the
transverse-momentum-dependent (TMD) and the high-energy factorization formulas
can be derived from the Color Glass Condensate framework. Respectively, this
happens when the transverse momentum imbalance of the dijet system, , is
of the order of either the saturation scale, or the hard jet momenta, the
former being always much smaller than the latter. We propose a new formula for
forward dijets that encompasses both situations and is therefore applicable
regardless of the magnitude of . That involves generalizing the TMD
factorization formula for dijet production to the case where the incoming
small- gluon is off-shell. The derivation is performed in two independent
ways, using either Feynman diagram techniques, or color-ordered amplitudes.Comment: The improved version of the manuscript. 37 pages, 8 figures, several
table
Extra-metabolic energy use and the rise in human hyper-density
Humans, like all organisms, are subject to fundamental biophysical laws. Van Valen predicted that, because of zero-sum dynamics, all populations of all species in a given environment flux the same amount of energy on average. Damuth’s ’energetic equivalence rule’ supported Van Valen´s conjecture by showing a tradeoff between few big animals per area with high individual metabolic rates compared to abundant small species with low energy requirements. We use metabolic scaling theory to compare variation in densities and individual energy use in human societies to other land mammals. We show that hunter-gatherers occurred at densities lower than the average for a mammal of our size. Most modern humans, in contrast, concentrate in large cities at densities up to four orders of magnitude greater than hunter-gatherers, yet consume up to two orders of magnitude more energy per capita. Today, cities across the globe flux greater energy than net primary productivity on a per area basis. This is possible by importing enormous amounts of energy and materials required to sustain hyper-dense, modern humans. The metabolic rift with nature created by modern cities fueled largely by fossil energy poses formidable challenges for establishing a sustainable relationship on a rapidly urbanizing, yet finite planet
Consequences of strong fluctuations on high-energy QCD evolution
We investigate the behaviour of the QCD evolution towards high-energy, in the
diffusive approximation, in the limit where the fluctuation contribution is
large. Our solution for the equivalent stochastic Fisher equation predicts the
amplitude as well as the whole set of correlators in the strong noise limit.
The speed of the front and the diffusion coefficient are obtained. We analyse
the consequences on high-energy evolution in QCD.Comment: 5 pages, 1 figure, more detailed discussions added, version to appear
in Phys. Rev.
ЗНАХІДКИ УКРАЇНСЬКИХ НАТІЛЬНИХ ХРЕСТІВ В СЕРЕДНЬОМУ І НИЖНЬОМУ ПРИСАМАР’Ї
Територія Пониззя Присамар’я здавна привертала увагу дослідників, проте їх зацікавленість належала, переважно археологічним пам’яткам від доби каменю – бронзи та ранньозалізного часу. Пам’ятки пізніших часів, тим більш козацької епохи, переважно залишалися поза вивченням [28, с.28, 29- 33 с.214]. Винятковим явищем у цьому плані є роботи керованої Д.І.Яворницьким новобудівної Дніпрогесівської експедиції НКПросу 1927-1932 років [14, с.11-12], коли вперше на зазначених територіях були відкриті і досліджувалися не лише неолітичні і матеріали ранньобронзової доби, а й алано-болгарські пам’ятки, поселення доби Київської Русі, козацькі поховання XVII-XVIII ст. Д.І.Яворницький першим проводив археологічні розвідки на теренах Богородицької фортеці і її посаду під час робіт Дніпрогесівської експедиції 1927-1932 років [13; 19, с. 256-257] (у фондах ДІМ ім. Д.І.Яворницького знаходиться близько 80 натільних хрестів «із запорозьких поховань», зібраних вченим, але у матеріалах його розвідок місця знахідок часто не фіксувалися, через це знахідки не паспортизовувалися, що ускладнює ідентифікацію матеріалів). У повоєнні роки і до кінця 1980-х матеріали доби середньовіччя і козаччини з гирла Самари цікавили, переважно, краєзнавців і аматорів. У 1960-1970 рр. брати В.В. та Е.В.Бінкевичі знаходили монети й інші старожитності на Ігренському півострові: про ці знахідки з пониззя Самари лише стисло згадано в праці „Городок старинный запорожский Самарь с перевозом [1]. В цей же час і на цій же території краєзнавець з Придніпровська Є.Богуш збирав натільні хрести, колекція яких по смерті аматора була розпродана спадкоємцями частинами. У 2001 році науково-дослідною Лабораторією археології Подніпров’я ДНУ під керівництвом професора І.Ф.Ковальової на території Богородицьком фортеці і її посаду були розпочаті планомірні розвідки і розкопки
Transient growth analysis of the flow past a circular cylinder
We apply direct transient growth analysis in complex geometries to investigate its role in the primary and secondary bifurcation/transition process of the flow past a circular cylinder. The methodology is based on the singular value decomposition of the Navier-Stokes evolution operator linearized about a two-dimensional steady or periodic state which leads to the optimal growth modes. Linearly stable and unstable steady flow at Re=45 and 50 is considered first, where the analysis demonstrates that strong two-dimensional transient growth is observed with energy amplifications of order of 10(3) at U-infinity tau/D approximate to 30. Transient growth at Re=50 promotes the linear instability which ultimately saturates into the well known von-Kaacutermaacuten street. Subsequently we consider the transient growth upon the time-periodic base state corresponding to the von-Kaacutermaacuten street at Re=200 and 300. Depending upon the spanwise wavenumber the flow at these Reynolds numbers are linearly unstable due to the so-called mode A and B instabilities. Once again energy amplifications of order of 10(3) are observed over a time interval of tau/T=2, where T is the time period of the base flow shedding. In all cases the maximum energy of the optimal initial conditions are located within a diameter of the cylinder in contrast to the spatial distribution of the unstable eigenmodes which extend far into the downstream wake. It is therefore reasonable to consider the analysis as presenting an accelerator to the existing modal mechanism. The rapid amplification of the optimal growth modes highlights their importance in the transition process for flow past circular cylinder, particularly when comparing with experimental results where these types of convective instability mechanisms are likely to be activated. The spatial localization, close to the cylinder, of the optimal initial condition may be significant when considering strategies to promote or control shedding
Comparing process-based and constraint-based approaches for modeling macroecological patterns
Ecological patterns arise from the interplay of many different processes, and
yet the emergence of consistent phenomena across a diverse range of ecological
systems suggests that many patterns may in part be determined by statistical or
numerical constraints. Differentiating the extent to which patterns in a given
system are determined statistically, and where it requires explicit ecological
processes, has been difficult. We tackled this challenge by directly comparing
models from a constraint-based theory, the Maximum Entropy Theory of Ecology
(METE) and models from a process-based theory, the size-structured neutral
theory (SSNT). Models from both theories were capable of characterizing the
distribution of individuals among species and the distribution of body size
among individuals across 76 forest communities. However, the SSNT models
consistently yielded higher overall likelihood, as well as more realistic
characterizations of the relationship between species abundance and average
body size of conspecific individuals. This suggests that the details of the
biological processes contain additional information for understanding community
structure that are not fully captured by the METE constraints in these systems.
Our approach provides a first step towards differentiating between process- and
constraint-based models of ecological systems and a general methodology for
comparing ecological models that make predictions for multiple patterns.Comment: 45 pages, 3 main figures, 3 tables, 2 appendices. arXiv admin note:
text overlap with arXiv:1308.073
The diurnal cycle of shallow cumulus clouds over land: A single-column model intercomparison study
An intercomparison study for single-column models (SCMs) of the diurnal cycle of shallow cumulus convection is reported. The case, based on measurements at the Atmospheric Radiation Measurement program Southern Great Plains site on 21 June 1997, has been used in a large-eddy simulation intercomparison study before. Results of the SCMs reveal the following general deficiencies: too large values of cloud cover and Cloud liquid water, unrealistic thermodynamic profiles, and high amounts of numerical noise. Results are also strongly dependent on vertical resolution.These results are analysed in terms of the behaviour of the different parametrization schemes involved: the convection scheme, the turbulence scheme, and the cloud scheme. In general the behaviour of the SCMs can be grouped in two different classes: one class with too strong mixing by the turbulence scheme, the other class with too strong activity by the convection scheme. The coupling between (subcloud) turbulence and the convection scheme plays a crucial role. Finally, (in part) motivated by these results several models have been successfully updated with new parametrization schemes and/or their present schemes have been successfully modifie
JIMWLK evolution in the Gaussian approximation
We demonstrate that the Balitsky-JIMWLK equations describing the high-energy
evolution of the n-point functions of the Wilson lines (the QCD scattering
amplitudes in the eikonal approximation) admit a controlled mean field
approximation of the Gaussian type, for any value of the number of colors Nc.
This approximation is strictly correct in the weak scattering regime at
relatively large transverse momenta, where it reproduces the BFKL dynamics, and
in the strong scattering regime deeply at saturation, where it properly
describes the evolution of the scattering amplitudes towards the respective
black disk limits. The approximation scheme is fully specified by giving the
2-point function (the S-matrix for a color dipole), which in turn can be
related to the solution to the Balitsky-Kovchegov equation, including at finite
Nc. Any higher n-point function with n greater than or equal to 4 can be
computed in terms of the dipole S-matrix by solving a closed system of
evolution equations (a simplified version of the respective Balitsky-JIMWLK
equations) which are local in the transverse coordinates. For simple
configurations of the projectile in the transverse plane, our new results for
the 4-point and the 6-point functions coincide with the high-energy
extrapolations of the respective results in the McLerran-Venugopalan model. One
cornerstone of our construction is a symmetry property of the JIMWLK evolution,
that we notice here for the first time: the fact that, with increasing energy,
a hadron is expanding its longitudinal support symmetrically around the
light-cone. This corresponds to invariance under time reversal for the
scattering amplitudes.Comment: v2: 45 pages, 4 figures, various corrections, section 4.4 updated, to
appear in JHE
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