103,050 research outputs found
Globicornis (Hadrotoma) ingelehmannae Háva & Damgaard 2015, sp. n.
No full textGlobicornis (Hadrotoma) ingelehmannae sp. n. (fig. 1–3) T y p e m a t e r i a l. Holotype ♂: Russia, Kaliningrad, Baltic amber inclusion (ZMUC). The type specimen are labeled with a red printed label bearing the following text: “HOLOTYPE Globicornis (Hadrotoma) ingelehmannae sp. n. Háva & Damgaard det. 2015”. D e s c r i p t i o n. Body broadly-oval (fig. 1–2), measurements (in mm): TL 2.7, EW 1.6. Head, pronotum and elytra black; head coarsely punctate, with long black erected setation; palpi entirely black; frontal median ocellus present; antenna with 10 antennomeres, antennal club with 3 antennomeres entirely black (fig. 3). Antennal fossa not visible. Eye very large, with black microsetae. Pronotum coarsely punctate as head, with long black erect setation and prominently raised side edge delineated by fine demarcation line. Scutellum triangular, black, without setation. Elytron finely coarsely punctate on humerus, finely on posterior parts, cuticle unicolorous, black without fasciae or spots. Apex of each elytron with long blackish setation. Legs black with black setation; protibia without spines. Metasternum coarsely punctate, with short black setation. Abdominal ventrites with long black setation. D i a g n o s i s. The new species belong to the genus Globicornis Latreille, 1829 subgenus Hadrotoma Erichson, 1846 according to antennae composed with 10 antennomeres, terminal antennomere triangular and flat, new species differs from the other two known amber species by the characters mentioned in the key below. The new species differs from the visually similar species Attagenus hoffeinsorum Háva, Prokop et Herrmann, 2006 and A. yantarnyi Háva et Bukejs, 2012 by the prosternum forming a “collar” under which mouthparts fit when head is retracted (fig. 5). E t y m o l o g y. Patronymic, dedicated to commemorate Dr. Inge Lehmann (1888– 1993), an excellent Danish seismologist and geophysicist.Published as part of Háva, J. & Damgaard, A. L., 2015, A New Species Of Globicornis (Hadrotoma) (Coleoptera, Dermestidae, Megatominae) From Baltic Amber, pp. 373-376 in Vestnik Zoologii 49 (4) on pages 374-375, DOI: 10.1515/vzoo-2015-0041, http://zenodo.org/record/645255
Fig. 1–4 in A New Species Of Globicornis (Hadrotoma) (Coleoptera, Dermestidae, Megatominae) From Baltic Amber
No full textFig. 1–4. Globicornis (Hadrotoma) ingelehmannae sp. n. (holotype): 1 — habitus, dorsal aspect; 2 — habitus, ventral aspect (→ = prosternal "collar"); 3 — antennal club (schematically); 4 — holotype of G. (H.) ambericus Háva, Prokop et Herrmann, 2006.Published as part of Háva, J. & Damgaard, A. L., 2015, A New Species Of Globicornis (Hadrotoma) (Coleoptera, Dermestidae, Megatominae) From Baltic Amber, pp. 373-376 in Vestnik Zoologii 49 (4) on page 374, DOI: 10.1515/vzoo-2015-0041, http://zenodo.org/record/645255
The effect of competition between two spatially separated markets - An investigation of two interlinked Bak-Sneppen models
No full textThis paper investigates the effect of competition in a market consisting of interlinked economic agents. In particular, the effect of increased competition from the surrounding markets is demonstrated. The presented work is an extension of the Bak-Sneppen model (Bak and Sneppen 1993). Here are two Bak-Sneppen models interlinked such that if the lowest fitness value of one market exceeds the fitness values of the other market minus transportation cost, all cells lower than this band will receive a new random value. The model shows that interdependency between markets has a strong effect on the competitiveness of the least competitive market. The external competition is able to make the least competitive market perform better as well as worse than on its own.Bak-Sneppen model, interdependency, competition, Marketing,
On finite-volume gauge theory partition functions
No full textWe prove a Mahoux–Mehta-type theorem for finite-volume partition functions of SU(Nc≥3) gauge theories coupled to fermions in the fundamental representation. The large-volume limit is taken with the constraint V1/mπ4. The theorem allows one to express any k-point correlation function of the microscopic Dirac operator spectrum entirely in terms of the 2-point function. The sum over topological charges of the gauge fields can be explicitly performed for these k-point correlation functions. A connection to an integrable KP hierarchy, for which the finite-volume partition function is a τ-function, is pointed out. Relations between the effective partition functions for these theories in 3 and 4 dimensions are derived. We also compute analytically, and entirely from finite-volume partition functions, the microscopic spectral density of the Dirac operator in SU(Nc) gauge theories coupled to quenched fermions in the adjoint representation. The result coincides exactly with earlier results based on Random Matrix Theory
Individual eigenvalue distributions of chiral random two-matrix theory and the determination of F_pi
No full textDirac operator eigenvalues split into two when subjected to two different external vector sources. In a specific finite-volume scaling regime of gauge theories with fermions, this problem can be mapped to a chiral Random Two-Matrix Theory. We derive analytical expressions to leading order in the associated finite-volume expansion, showing how
individual Dirac eigenvalue distributions and their correlations equivalently can be computed directly from the effective chiral Lagrangian in the epsilon-regime. Because of its equivalence to chiral Random Two-Matrix Theory, we use the latter for all explicit computations. On the mathematical side, we define and determine gap probabilities and individual eigenvalue distributions in that theory at finite N, and also derive the relevant scaling limit as N is taken to infinity. In particular, the gap probability for one Dirac eigenvalue is given in terms of a new kernel that depends on the external vector source. This expression may give a new and simple way of determining the pion decay
constant F_pi from lattice gauge theory simulations
Effects of dynamical quarks on the spectrum of the Wilson Dirac operator
No full textAkemann G, Damgaard PH, Splittorff K, Verbaarschot JJM. Effects of dynamical quarks on the spectrum of the Wilson Dirac operator. In: PoS LATTICE. Vol 2010. 2010: 079.Effects of dynamical quarks on the microscopic spectrum of the Wilson Diracoperator are analyzed by means of effective field theory. We consider thedistributions of the real modes of the Wilson Dirac operator as well as thespectrum of the Hermitian Wilson Dirac operator, and work out the case of oneflavor in all detail. In contrast to the quenched case, the theory has a mildsign problem that manifests itself by giving a spectral density that is notpositive definite as the spectral gap closes
Linguistic supplement to Damgaard et al. 2018: Early Indo-European languages, Anatolian, Tocharian and Indo-Iranian
No full textWe recount the evidence for the so-called “Steppe Hypothesis” discussed in Damgaard et al. 2018 and offer a revised linguistic and historical model for the prehistoric dispersal of three important Indo-European language subgroups—the Anatolian Indo-European languages into Anatolia, the Tocharian languages into Inner Asia, and the Indo-Iranian languages into South Asia—based on the newly analysed archaeogenetic data
Determination of F_pi from Distributions of Dirac Operator Eigenvalues with Imaginary Density
No full textIn the epsilon-regime of lattice QCD one can get an accurate measurement of the pion decay constant F_pi by monitoring how just one single Dirac operator eigenvalue splits into two when subjected to two different external vector sources. Because we choose imaginary chemical potentials our Dirac eigenvalues remain real. Based on the relevant chiral Random Two-Matrix Theory we derive individual eigenvalue distributions in terms of density correlations functions to leading order in the finite-volume epsilon-expansion. As a simple byproduct we also show how the associated individual Dirac eigenvalue distributions and their correlations can be computed directly from the effective chiral Lagrangian
A new chiral two-matrix theory for dirac spectra with imaginary chemical potential
No full textWe solve a new chiral Random Two-Matrix Theory by means of biorthogonal polynomials for any matrix size . By deriving the relevant kernels we find explicit formulas for all -point spectral (mixed or unmixed) correlation functions. In the microscopic limit we find the corresponding scaling functions, and thus derive all spectral correlators in this limit as well. We extend these results to the ordinary (non-chiral) ensembles, and also there provide explicit solutions for any finite size , and in the microscopic scaling limit. Our results give the general analytical expressions for the microscopic correlation functions of the Dirac operator eigenvalues in theories with imaginary baryon and isospin chemical potential, and can be used to extract the tree-level pion decay constant from lattice gauge theory configurations. We find exact agreement with previous computations based on the low-energy effective field theory in the two special cases where comparisons are possible
FIGURES 8–9 in Water striders (Heteroptera: Gerromorpha: Gerridae) of Romania with an update on the distribution of Gerris gibbifer and G. maculatus in southeastern Europe
No full textFIGURES 8–9. Distribution in Romania: (8) Gerris odontogaster (Zetterstedt, 1828); (9) Gerris thoracicus Schummel, 1832. Blank dots represent published records while solid dots represent records from this study.Published as part of Berchi, Gavril Marius, Cianferoni, Fabio, Csabai, Zoltán, Damgaard, Jakob, Olosutean, Horea, Ilie, Daniela Minodora, Boda, Pál & Kment, Petr, 2018, Water striders (Heteroptera: Gerromorpha: Gerridae) of Romania with an update on the distribution of Gerris gibbifer and G. maculatus in southeastern Europe, pp. 491-519 in Zootaxa 4433 (3) on page 499, DOI: 10.11646/zootaxa.4433.3.6, http://zenodo.org/record/129039
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