1,801 research outputs found

    Chemical Equilibration in Hadronic Collisions

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    We study chemical equilibration in out-of-equilibrium Quark-Gluon Plasma using the first principles method of QCD effective kinetic theory, accurate at weak coupling. In longitudinally expanding systems--relevant for relativistic nuclear collisions--we find that for realistic couplings chemical equilibration takes place after hydrodynamization, but well before local thermalization. We estimate that hadronic collisions with final state multiplicities dNch/dη≳102{dN_\text{ch}}/{d\eta}\gtrsim 10^2 live long enough to reach approximate chemical equilibrium, which is consistent with the saturation of strangeness enhancement observed in proton-proton, proton-nucleus and nucleus-nucleus collisions.Comment: 7 pages, 3 figures, see also our companion paper arXiv:1811.03068, v2 small changes, published versio

    Innovations adoption levels of small ruminant farmers in Tolon-Kumbungu district of Ghana: The Role of Farmer Socio-Economic Characteristics

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    The rearing of small ruminants plays a major role in the farming system of the people of the Tolon-Kumbungu District of the Northern Region of Ghana. Small ruminant production is a major source of livelihood to over 70% of the inhabitants of the District. However, poor husbandry practices have often served as a major constraint to achieving production and productivity increases. This implies that small ruminant farmers need to adopt innovations in order to promote and sustain small ruminant production. This paper assesses the extent to which innovations introduced to the farmers in the study area are adopted, especially the role of farmer socio-economic characteristics in influencing the innovations adoption levels of small ruminants. A total of 120 small ruminant farmers were selected for the study using simple random sampling, and questionnaires and personal observations employed for the data collection. Twelve communities were randomly selected from four Ministry of Food and Agriculture operational zones. Data were analyzed using SPSS computer software package and descriptive statistics computed based on the data. Cross tabulation and other test statistics were used to determine the relationship between adoption levels and the variables studied. The findings show that, socio-economic characteristics such as extension contacts and credit access showed significance with respect to adoption of most of the innovations. Therefore, if adoption level is to be enhanced, attention should be focused more on training of more agriculture extension agents (AEAs) to increase their number in the area, as well as making affordable credit available and accessible to the farmers to expand their farms.KEY DESCRIPTORS: Adoption, animals, credit, extension and small ruminant

    Anomalous Breaking of Anisotropic Scaling Symmetry in the Quantum Lifshitz Model

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    In this note we investigate the anomalous breaking of anisotropic scaling symmetry in a non-relativistic field theory with dynamical exponent z=2. On general grounds, one can show that there exist two possible "central charges" which characterize the breaking of scale invariance. Using heat kernel methods, we compute these two central charges in the quantum Lifshitz model, a free field theory which is second order in time and fourth order in spatial derivatives. We find that one of the two central charges vanishes. Interestingly, this is also true for strongly coupled non-relativistic field theories with a geometric dual described by a metric and a massive vector field.Comment: 26 pages; major revision (results were unaffected), published versio

    VEZF1 elements mediate protection from DNA methylation

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    There is growing consensus that genome organization and long-range gene regulation involves partitioning of the genome into domains of distinct epigenetic chromatin states. Chromatin insulator or barrier elements are key components of these processes as they can establish boundaries between chromatin states. The ability of elements such as the paradigm β-globin HS4 insulator to block the range of enhancers or the spread of repressive histone modifications is well established. Here we have addressed the hypothesis that a barrier element in vertebrates should be capable of defending a gene from silencing by DNA methylation. Using an established stable reporter gene system, we find that HS4 acts specifically to protect a gene promoter from de novo DNA methylation. Notably, protection from methylation can occur in the absence of histone acetylation or transcription. There is a division of labor at HS4; the sequences that mediate protection from methylation are separable from those that mediate CTCF-dependent enhancer blocking and USF-dependent histone modification recruitment. The zinc finger protein VEZF1 was purified as the factor that specifically interacts with the methylation protection elements. VEZF1 is a candidate CpG island protection factor as the G-rich sequences bound by VEZF1 are frequently found at CpG island promoters. Indeed, we show that VEZF1 elements are sufficient to mediate demethylation and protection of the APRT CpG island promoter from DNA methylation. We propose that many barrier elements in vertebrates will prevent DNA methylation in addition to blocking the propagation of repressive histone modifications, as either process is sufficient to direct the establishment of an epigenetically stable silent chromatin stat

    Strings on Semisymmetric Superspaces

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    Several string backgrounds which arise in the AdS/CFT correspondence are described by integrable sigma-models. Their target space is always a Z(4) supercoset (a semi-symmetric superspace). Here we list all semi-symmetric cosets which have zero beta function and central charge c<=26 at one loop in perturbation theory.Comment: 25 pages, 1 figur

    Thermodynamics and phase diagram of anisotropic Chern-Simons deformed gauge theories

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    We consider 3+1-dimensional gauge theories at finite temperature and a finite density of charges which couple to a 2+1-dimensional Chern-Simons operator, giving rise to a theta-term with constant spatial gradient of theta. The strong-coupling limit of thermal N=4 super-Yang-Mills theory with this kind of anisotropic deformation has been used in the context of the AdS/CFT correspondence as a model for strongly coupled anisotropic quark-gluon plasma. In this paper we work out the thermodynamics and the (nontrivial) phase diagram in the limit of vanishing gauge coupling and compare with the corresponding strong-coupling results.Comment: 23 pages, 7 figures, v2: low temperature expansion corrected, references added, some discussion expande

    Constraints on the Progenitor System of the Type Ia Supernova SN 2011fe/PTF11kly

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    Type Ia supernovae (SNe) serve as a fundamental pillar of modern cosmology, owing to their large luminosity and a well-defined relationship between light-curve shape and peak brightness. The precision distance measurements enabled by SNe Ia first revealed the accelerating expansion of the universe, now widely believed (though hardly understood) to require the presence of a mysterious "dark" energy. General consensus holds that Type Ia SNe result from thermonuclear explosions of a white dwarf (WD) in a binary system; however, little is known of the precise nature of the companion star and the physical properties of the progenitor system. Here we make use of extensive historical imaging obtained at the location of SN 2011fe/PTF11kly, the closest SN Ia discovered in the digital imaging era, to constrain the visible-light luminosity of the progenitor to be 10-100 times fainter than previous limits on other SN Ia progenitors. This directly rules out luminous red giants and the vast majority of helium stars as the mass-donating companion to the exploding white dwarf. Any evolved red companion must have been born with mass less than 3.5 times the mass of the Sun. These observations favour a scenario where the exploding WD of SN 2011fe/PTF11kly, accreted matter either from another WD, or by Roche-lobe overflow from a subgiant or main-sequence companion star.Comment: 22 pages, 6 figures, submitte

    Enhancing lepton flavour violation in the supersymmetric inverse seesaw beyond the dipole contribution

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    In minimal supersymmetric models the ZZ-penguin usually provides sub-dominant contributions to charged lepton flavour violating observables. In this study, we consider the supersymmetric inverse seesaw in which the non-minimal particle content allows for dominant contributions of the ZZ-penguin to several lepton flavour violating observables. In particular, and due to the low-scale (TeV) seesaw, the penguin contribution to, for instance, \Br(\mu \to 3e) and μ−e\mu-e conversion in nuclei, allows to render some of these observables within future sensitivity reach. Moreover, we show that in this framework, the ZZ-penguin exhibits the same non-decoupling behaviour which had previously been identified in flavour violating Higgs decays in the Minimal Supersymmetric Standard Model.Comment: 29 pages, 9 figures, 4 tables; v2: minor corrections, version to appear in JHE
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