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Fragmentation of CDF jets: perturbative or non-perturbative?
http://inspirehep.net/record/1329896
hep-exhep-ex/9911023<br />CDF Note 5147<br /><br />by: Safonov, Alexei (Florida U.)<br /><br /><strong>Abstract:</strong> <br />Presented are the most recent jet fragmentation results from CDF: inclusive
distributions of charged particle momenta and their kT in jets; average track
multiplicities, as well as angular distributions of multiplicity flow, for a
wide range of jet energies with ET from 40 to 300 GeV. The results are compared
with Monte-Carlo and, when possible, analytical calculations performed in
resummed perturbative QCD approximations (MLLA).Safonov, AlexeiTue, 25 Nov 2014 19:19:08 GMThttp://inspirehep.net/record/1329896A Super Extension of Kaup-Newell Hierarchy
http://inspirehep.net/record/1329895
Commun.Theor.Phys. 54 (2010) 594-598<br /><br />by: Geng, Xian-Guo<br /><strong>Abstract:</strong> <br />With the help of the zero-curvature equation and the super trace identity, we derive a super extension of the Kaup—Newell hierarchy associated with a 3 × 3 matrix spectral problem and establish its super bi-Hamiltonian structures. Furthermore, infinite conservation laws of the super Kaup—Newell equation are obtained by using spectral parameter expansions.Geng, Xian-GuoTue, 25 Nov 2014 19:18:58 GMThttp://inspirehep.net/record/1329895Four-level systems and a universal quantum gate
http://inspirehep.net/record/1329894
arXiv:0710.1112<br />IF-1643/2007<br />Annalen Phys. 17 (2008) 450-459<br /><br />by: Baldiotti, M.C. (Sao Paulo U.) et al.<br /><br /><strong>Abstract:</strong> <br />We discuss a possibility of implementing a universal quantum XOR gate, by
using two coupled quantum dots subjected to external magnetic fields that are
parallel and slightly different. We consider this system in two different field
configurations. In the first case, parallel external fields with the intensity
difference at each spin being proportional to the time-dependent interaction
between the spins. General exact solution describing this system is presented
and analyzed to adjust parameters of the field. Then we consider parallel
fields with intensity difference at each spin being constant and the
interaction between the spins switching on and off adiabatically. In both cases
we adjust characteristics of the external fields (their intensities and
duration) in order to have the parallel pulse adequate for constructing the XOR
gate. In order to provide a complete theoretical description of all the cases,
we derive relations between the spin interaction, the inter-dot distance, and
the external field.Baldiotti, M.C.Tue, 25 Nov 2014 19:18:48 GMThttp://inspirehep.net/record/1329894The Drift Velocity of Electrons in Hydrogen and Nitrogen
http://inspirehep.net/record/1329886
Austral.J.Phys. 16 (1963) 115-135<br /><br />by: Lowke, J. J. (Australian Natl. U., Canberra)<br /><br /><strong>Abstract:</strong> <br />Experimental results are given for the drift velocity of electrons in hydrogen and nitrogen at 293$^{\rm{o}}$K and 77.6$^{\rm{o}}$K over the range 0·001$<$E/p$<$20 V cm$^{-1}$ mmHg$^{-1}$. The results were obtained using the method of Bradbury and Nielsen and have in general an accuracy of 1 % at 293$^{\rm{o}}$K and 2 % at 77· 6$^{\rm{o}}$K. The measurements were made over as wide a range of gas pressures as possible for each value of E/p and all results are presented in tabular form. In the final results that are presented corrections have been made for errors due to diffusion. Experiments are also discussed which were designed to investigate the extent of the· existence of errors due to factors such as distortion of the d.c. field from voltages on the shutter wires and the presence of gaseous impurities. It has been shown that measurements of the drift velocity are particularly sensitive to traces of water vapour as impurity.Lowke, J. J.Tue, 25 Nov 2014 17:22:16 GMThttp://inspirehep.net/record/1329886Dark Matter Phenomenology in Scalar Extensions of the Standard Model
http://inspirehep.net/record/1329883
<br />by: Garcia Cely, Camilo A. (Munich, Tech. U.)<br /><br /><strong>Abstract:</strong> <br />We consider three models that address the nature of dark matter and that are
characterized by the presence of new scalar fields. In one of them, dark matter is
constituted by a particle with identical quantum numbers as the Higgs boson. In
the other two, the stability of dark matter is due to a discrete symmetry that arises
from the spontaneous breaking of a global symmetry. Consequently, both scenarios
contain a Goldstone boson and another particle that mixes with the Higgs boson.
We investigate the phenomenological consequences in cosmology as well as in direct
and indirect dark matter experiments. In particular, we analyze the gamma-ray
spectral features that arise in dark matter annihilations from every scenario, concretely
monochromatic lines, virtual internal bremsstrahlung and gamma-ray boxes. For
the first model, we show that the one-loop annihilation into gamma-rays violates
unitarity and argue that including the so-called Sommerfeld effect solves this problem.
In addition, for the second and third models, we study the contribution of their
Goldstone boson to the radiation density of the Universe as well as its role in dark
matter production during the Early Universe.Garcia Cely, Camilo A.Tue, 25 Nov 2014 16:02:14 GMThttp://inspirehep.net/record/1329883Plato alleges that God forever geometrizes
http://inspirehep.net/record/1329882
Found.Phys. 26 (1996) 575-583<br /><br />by: Ne'eman, YuvalNe'eman, YuvalTue, 25 Nov 2014 14:58:05 GMThttp://inspirehep.net/record/1329882Creation of a child universe by the shell radiating negative energy flux
http://inspirehep.net/record/1329880
Class.Quant.Grav. 14 (1997) 2179-2184<br /><br />by: Mishima, TakashiMishima, TakashiTue, 25 Nov 2014 14:27:04 GMThttp://inspirehep.net/record/1329880Maximal Linear Subspaces of Strong Self-Dual 2-forms and the Bonan 4-form
http://inspirehep.net/record/1329877
Linear Algebra Appl. 434 (2011) 1200-1214<br /><br />by: Bilge, Ayşe Hümeyra<br /><strong>Abstract:</strong> <br />The notion of self-duality of 2-forms in 4-dimensions plays an eminent role in many areas of mathematics and physics, but although the 2-forms have a genuine meaning related to curvature and gauge-field-strength in higher dimensions also, their “self-duality” is something which is almost avoided above 4-dimensions. We show that self-duality of 2-forms is a very natural notion in higher (even) dimensions also and we prove the equivalence of some scattered and rarely used definitions in the literature. We demonstrate the usefulness of this higher self-duality by studying it in 8-dimensions and we derive a natural expression for the Bonan form in terms of self-dual 2-forms and we give an explicit expression of the local action of SO(8) on the Bonan form.Bilge, Ayşe HümeyraTue, 25 Nov 2014 13:06:25 GMThttp://inspirehep.net/record/1329877Seiberg-Witten like Equations on 8-Manifolds with Structure Group Spin(7)
http://inspirehep.net/record/1329876
J.Dynam.Syst.Geom.Theor. 7 (2009) 21-39<br /><br />by: Özdemir, Nülifer (Anadolu U.) et al.<br /><br /><strong>Abstract:</strong> <br />Seiberg-Witten monopole equations are defined on 4-manifolds and solution space of this equations yields differential topological invariants. In this work we consider 8-dimensional Riemannian manifolds with structure group Spin(7). Such manifolds have a distinguished 4-form. By using this 4-form we define self-dual 2-form in dimension eight which is consistent with the well known self-duality notion in 8-dimension given by CDFN (see [5]). We then express Seiberg-Witten like equations in 8-dimension as analogues of Seiberg-witten equations in 4-dimension.Özdemir, NüliferTue, 25 Nov 2014 13:06:03 GMThttp://inspirehep.net/record/1329876Generalized self-duality of 2-forms
http://inspirehep.net/record/1329875
Adv.Appl.Clifford Algebras 13 (2003) 107-113<br /><br />by: Değirmenci, N.<br /><strong>Abstract:</strong> <br />Self-dual 2–forms on ℝ4 play a fundamental role in gauge theory. For generalized Seiberg-Witten theory (and for some other purposes in mathematical physics) a notion of self-duality of 2–forms on ℝ2n is needed. There are several definitions, but the one given by [Bilge, Dereli, Koçak ; JMP 38(9), 1997] is intimately related with Clifford algebras. They defined a 2–form 12∑i,j=12nωijdxi∧dxj(ωji=−ωij) to be self-dual if the anti-symmetric matrix Ω = (ω ij ) satisfies Ω2 = λ I for a scalar λ and proved that the space 2n of such forms is non-linear with dimension n 2 − n + 1, but contains maximal linear subspaces with dimension the Radon-Hurwitz number of (2n). It is important to have an algorithm for construction of such maximal linear subspaces and we give an explicit one with the help of representations of Clifford algebras on ℝ2n whereby we show that the representations given by the standart recursion formulas are anti-symmetric.Değirmenci, N.Tue, 25 Nov 2014 13:05:44 GMThttp://inspirehep.net/record/1329875Seiberg-Witten-like Equations on 7-Manifolds with G 2 -Structure
http://inspirehep.net/record/1329874
J.Nonlin.Math.Phys. 12 (2005) 457-461<br /><br />by: Degirmenci, Nedim<br /><strong>Abstract:</strong> <br />The Seiberg-Witten equations are of great importance in the study of topology of smooth four-dimensional manifolds. In this work, we propose similar equations for 7-dimensional compact manifolds with G 2-structure.Degirmenci, NedimTue, 25 Nov 2014 13:04:43 GMThttp://inspirehep.net/record/1329874Self-duality in dimensions 2n>4: equivalence of various definitions and the derivation of the octonionic instanton solution
http://inspirehep.net/record/1329873
ARI 51 (1999) 247-253<br /><br />by: Özdemir, F (Istanbul, Tech. U.) et al.<br /><br /><strong>Abstract:</strong> <br />We show that the notion of strong self-duality of 2-forms in dimensions 2n, defined by the equality of the absolute values of the eigenvalues of the matrix of ω with respect to an orthonormal basis (Bilge et al. 1996a), is equivalent to the self-duality in the Hodge sense of ω n/2 (used in Grossman et al. 1984) and to the equality *ω = kω n−1 (used in Trautman 1977). We show that the octonionic instanton solution of Grossman et al. (1984), is uniquely determined from the minimality requirement of the second Pontrjagin number p 2.Özdemir, FTue, 25 Nov 2014 13:03:23 GMThttp://inspirehep.net/record/1329873Conservation laws and self-consistent sources for a super-CKdV equation hierarchy
http://inspirehep.net/record/1329871
Phys.Lett. A375 (2011) 1402-1406<br /><br />by: Li, Li<br /><strong>Abstract:</strong> <br />From the super-matrix Lie algebras, we consider a super-extension of the CKdV equation hierarchy in the present Letter, and propose the super-CKdV hierarchy with self-consistent sources. Furthermore, we establish the infinitely many conservation laws for the integrable super-CKdV hierarchy.Li, LiTue, 25 Nov 2014 13:02:23 GMThttp://inspirehep.net/record/1329871 A Super Camassa-Holm Equation with N -Peakon Solutions
http://inspirehep.net/record/1329869
Stud.Appl.Math. 130 (2012) 1-16<br /><br />by: Geng, XianguoGeng, XianguoTue, 25 Nov 2014 11:40:08 GMThttp://inspirehep.net/record/1329869Integrable hierarchies related to the Kuper-CH spectral problem
http://inspirehep.net/record/1329868
J.Math.Phys. 52 (2011) 073503<br /><br />by: Zhang, Ling<br /><strong>Abstract:</strong> <br />In this paper, from a given Kuper-CH spectral problem, we propose two kinds of super integrable hierarchies. One is the Kuper-CH hierarchy, the other is the generalized Kuper-Harry-Dym hierarchy. Moreover, we construct their zero curvature representations and super-bi-Hamiltonian structures.Zhang, LingTue, 25 Nov 2014 10:29:29 GMThttp://inspirehep.net/record/1329868Measuring device suitable for linear distances
http://inspirehep.net/record/1329862
physics.ins-detarXiv:1411.6611<br /><br />by: Alsmadi, Zaid A. I.<br /><strong>Abstract:</strong> <br />Measuring device is proposed for determining a linear dimension. The device comprises three associated longitudinally moving parts one of which is a scale. The integer part of the device reading is being taken from the standard millimeter or inches scale, and The fine measurement (smaller than the minimum scale division) is being done by a setup of two sliders coupled to the device. The first slider includes measuring points. And the other slider includes measuring line. The decimal part of the reading is being taken in such a way that the measuring points reading is related to the fractions of the displacement between the graduated scale and the corresponding measuring line.Alsmadi, Zaid A. I.Tue, 25 Nov 2014 03:59:02 GMThttp://inspirehep.net/record/1329862Status of GEO 600
http://inspirehep.net/record/1329861
physics.ins-detarXiv:1411.6588<br /><br />by: Dooley, Katherine L.<br /><strong>Abstract:</strong> <br />The German-British laser-interferometric gravitational wave detector GEO 600 is in its 13th year of operation since its first lock in 2001. After participating in science runs with other first generation detectors, GEO\,600 has continued collecting data as an astrowatch instrument with a duty cycle of 62% during the time when the other detectors have gone offline to undergo substantial upgrades. Less invasive upgrades to demonstrate advanced technologies and improve the GEO 600 sensitivity at high frequencies as part of the GEO-HF program have additionally been carried out in parallel to data taking. We report briefly on the status of GEO 600.Dooley, Katherine L.Tue, 25 Nov 2014 03:59:01 GMThttp://inspirehep.net/record/1329861Statistical criteria for possible indications of new physics in tritium $\beta$-decay spectrum
http://inspirehep.net/record/1329860
physics.data-anarXiv:1411.6245<br /><br />by: Lokhov, Aleksei<br /><strong>Abstract:</strong> <br />The method of quasi-optimal weights is applied to constructing (quasi-)optimal criteria for various anomalous contributions in experimental spectra. Anomalies in the spectra could indicate physics beyond the Standard Model (additional interactions and neutrino flavours, Lorenz violation etc.). In particular the cumulative tritium $\beta$-decay spectrum (for instance, in Troitsk-$\nu$-mass, Mainz Neutrino Mass and KATRIN experiments) is analysed using the derived special criteria. Using the power functions we show that the derived quasi-optimal criteria are efficient statistical instruments for detecting the anomalous contributions in the spectra.Lokhov, AlekseiTue, 25 Nov 2014 03:59:01 GMThttp://inspirehep.net/record/1329860Neutron Position Sensitive Detectors for the ESS
http://inspirehep.net/record/1329859
physics.ins-detarXiv:1411.6194<br /><br />by: Kirstein, Oliver<br /><strong>Abstract:</strong> <br />The European Spallation Source (ESS) in Lund, Sweden will become the world's leading neutron source for the study of materials. The instruments are being selected from conceptual proposals submitted by groups from around Europe. These instruments present numerous challenges for detector technology in the absence of the availability of Helium-3, which is the default choice for detectors for instruments built until today and due to the extreme rates expected across the ESS instrument suite. Additionally a new generation of source requires a new generation of detector technologies to fully exploit the opportunities that this source provides. The detectors will be sourced from partners across Europe through numerous in-kind arrangements; a process that is somewhat novel for the neutron scattering community. This contribution presents briefly the current status of detectors for the ESS, and outlines the timeline to completion. For a conjectured instrument suite based upon instruments recommended for construction, a recently updated snapshot of the current expected detector requirements is presented. A strategy outline as to how these requirements might be tackled by novel detector developments is shown. In terms of future developments for the neutron community, synergies should be sought with other disciples, as recognized by various recent initiatives in Europe, in the context of the fundamentally multi-disciplinary nature of detectors. This strategy has at its basis the in-kind and collaborative partnerships necessary to be able to produce optimally performant detectors that allow the ESS instruments to be world-leading. This foresees and encourages a high level of collaboration and interdependence at its core, and rather than each group being all-rounders in every technology, the further development of centres of excellence across Europe for particular technologies and niches.Kirstein, OliverTue, 25 Nov 2014 03:58:58 GMThttp://inspirehep.net/record/1329859Mismatch study of C-ADS main linac
http://inspirehep.net/record/1329858
physics.acc-pharXiv:1411.6133<br /><br />by: Meng, Cai<br /><strong>Abstract:</strong> <br />The ADS accelerator in China is a CW (Continuous-Wave) proton linac with 1.5 GeV in beam energy, 10 mA in beam current, and 15 MW in beam power. To meet the extremely low beam loss rate requirement and high reliability, it is very important to study the beam halo caused by beam mismatch, which is one major source of beam loss. To avoid the envelope instability, the phase advances per period are all smaller than 90 degree in the main linac design. In this paper, the results of the emittance growth and the envelope oscillations caused by mismatch in the main linac section are presented. To meet the emittance growth requirement, the transverse and longitudinal mismatch factors should be smaller than 0.4 and 0.3, respectively.Meng, CaiTue, 25 Nov 2014 03:58:58 GMThttp://inspirehep.net/record/1329858Development of Lightning Simulator
http://inspirehep.net/record/1329857
physics.ins-detarXiv:1411.6103<br /><br />by: Uehara, Shigeki<br /><strong>Abstract:</strong> <br />In this work we have developed a lightning simulator. Reproducing the light of lightning, we adopted seven waveforms that contains two light waveforms and five current waveforms of lightning. Furthermore, the lightning simulator can calibrate the color of the simulated light output based on a correlated color temperature (CCT). The CCT of the simulated light can range over from $4269$ K to $15042$ K. It is considered that the lightning simulator is useful for the test light source of the optical/image sensor of the lightning observation. Also for science education (e.g. physics education and earth science education etc.), the lightning simulator is available. Especially, the temporal change can be slowly seen by expanding the time scale from microsecond to second.Uehara, ShigekiTue, 25 Nov 2014 03:58:56 GMThttp://inspirehep.net/record/1329857Status of advanced ground-based laser interferometers for gravitational-wave detection
http://inspirehep.net/record/1329856
physics.ins-detarXiv:1411.6068<br /><br />by: Dooley, Katherine L<br /><strong>Abstract:</strong> <br />Ground-based laser interferometers for gravitational-wave (GW) detection were first constructed starting 20 years ago and as of 2010 collection of several years' worth of science data at initial design sensitivities was completed. Upgrades to the initial detectors together with construction of brand new detectors are ongoing and feature advanced technologies to improve the sensitivity to GWs. This conference proceeding provides an overview of the common design features of ground-based laser interferometric GW detectors and establishes the context for the status updates of each of the four gravitational-wave detectors around the world: Advanced LIGO, Advanced Virgo, GEO600 and KAGRA.Dooley, Katherine LTue, 25 Nov 2014 03:58:56 GMThttp://inspirehep.net/record/1329856Mesoscopic analysis of online social networks - The role of negative ties
http://inspirehep.net/record/1329855
physics.data-anarXiv:1411.6057<br />Phys.Rev. E90 (2014) 042817<br /><br />by: Esmailian, Pouya<br /><strong>Abstract:</strong> <br />A class of networks are those with both positive and negative links.In this manuscript, we studied the interplay between positive and negative ties on mesoscopic level of these networks, i.e., their community structure.A community is considered as a tightly interconnected group of actors; therefore, it does not borrow any assumption from balance theory and merely uses the well-known assumption in the community detection literature.We found that if one detects the communities based on only positive relations (by ignoring the negative ones), the majority of negative relations are already placed between the communities.In other words, negative ties do not have a major role in community formation of signed networks.Moreover, regarding the internal negative ties, we proved that most unbalanced communities are maximally balanced, and hence they cannot be partitioned into k nonempty sub-clusters with higher balancedness (k >= 2).Furthermore, we showed that although the mediator triad + + - (hostile-mediator-hostile) is underrepresented, it constitutes a considerable portion of triadic relations among communities.Hence, mediator triads should not be ignored by community detection and clustering algorithms.As a result, if one uses a clustering algorithm that operates merely based on social balance, mesoscopic structure of signed networks significantly remains hidden.Esmailian, PouyaTue, 25 Nov 2014 03:58:52 GMThttp://inspirehep.net/record/1329855The Quest for Ultimate Broadband High Power Microwaves
http://inspirehep.net/record/1329854
physics.ins-detarXiv:1411.6056<br /><br />by: Podgorski, Andrew S.<br /><strong>Abstract:</strong> <br />Paper describes High Power Microwave research of combining GW peak power to achieve MV/m and GV/m radiated fields in 1 to 500 GHz band. To achieve such fields multiple independently triggered broadband GW sources, supplying power to multiple spatially distributed broadband radiators/antennas are used. Single TW array is used as an ultimate microwave weapon in 1 to 5 GHz range while multiple TW arrays provide GV/m radiating field at plasma frequencies in 300 GHz range leading to fusion power.Podgorski, Andrew S.Tue, 25 Nov 2014 03:58:52 GMThttp://inspirehep.net/record/1329854Group Theory for Embedded Random Matrix Ensembles
http://inspirehep.net/record/1329853
math-pharXiv:1411.6391<br /><br />by: Kota, V.K.B.<br /><strong>Abstract:</strong> <br />Embedded random matrix ensembles are generic models for describing statistical properties of finite isolated quantum many-particle systems. For the simplest spinless fermion (or boson) systems with say $m$ fermions (or bosons) in $N$ single particle states and interacting with say $k$-body interactions, we have EGUE($k$) [embedded GUE of $k$-body interactions) with GUE embedding and the embedding algebra is $U(N)$. In this paper, using EGUE($k$) representation for a Hamiltonian that is $k$-body and an independent EGUE($t$) representation for a transition operator that is $t$-body and employing the embedding $U(N)$ algebra, finite-$N$ formulas for moments up to order four are derived, for the first time, for the transition strength densities (transition strengths multiplied by the density of states at the initial and final energies). In the asymptotic limit, these formulas reduce to those derived for the EGOE version and establish that in general bivariate transition strength densities take bivariate Gaussian form for isolated finite quantum systems. Extension of these results for other types of transition operators and EGUE ensembles with further symmetries are discussed.Kota, V.K.B.Tue, 25 Nov 2014 03:57:05 GMThttp://inspirehep.net/record/1329853