cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
First-principles studies of the effects of impurities on the ionic and electronic conduction in LiFePO$_{4}$
Creators: name: Hoang, Khang
name: Johannes, Michelle D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Olivine-type LiFePO$_{4}$ is widely considered as a candidate for Li-ion battery electrodes, yet its applicability in the pristine state is limited due to poor ionic and electronic conduction. Doping can be employed to enhance the material's electrical conductivity. However, this should be understood as incorporating electrically active impurities to manipulate the concentration of native point defects such as lithium vacancies and small hole polarons which are responsible for ionic and electronic conduction, respectively, and {\it not} as generating band-like carriers. Possible effects of monovalent (Na, K, Cu, and Ag), divalent (Mg and Zn), trivalent (Al), tetravalent (Zr, C, and Si), and pentavalent (V and Nb) impurities on the ionic and electronic conductivities of LiFePO$_{4}$ are analyzed based on results from first-principles density-functional theory calculations. We identify impurities that are effective (or ineffective) at enhancing the concentration of lithium vacancies or small hole polarons. Based on our studies, we discuss specific strategies for enhancing the electrical conductivity in LiFePO$_{4}$ and provide suggestions for further experimental studies.
description: 10 pages, 7 figures
Adventitious root initiation in Pinus radiata D. Don: developmental and physiological studies in hypocotyl cuttings
Creators: name: Smith, Dale R.
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: QK 495 P66 S63 1974 Microfiche
subject: Pine
subject: Roots (Botany)

description: Bibliography: p. 230-237.
Impact of generalized holonomy corrections on the cosmological primordial power spectra
Creators: name: De Sousa, Maxime
name: Martineau, Killian
name: Renevey, Cyril
name: Barrau, Aurélien
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The propagation of perturbations is studied with generalized holonomy corrections in a fully consistent way, ensuring that the deformed algebra of constraints remains closed. The primordial cosmological power spectra are calculated. It is shown that, although the detailed form of the correction does unavoidably impact the observables, the main known results of loop quantum cosmology are robust in this respect.
Experimental comparison of autodyne and heterodyne laser interferometry using a Nd:YVO4 microchip laser
Creators: name: Jacquin, Olivier
name: Lacot, Eric
name: Glastre, Wilfried
name: Hugon, Olivier
name: De Chatellus, Hugues Guillet
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Using a Nd:YVO4 microchip laser with a relaxation frequency in the megahertz range, we have experimentally compared a heterodyne interferometer based on a Michelson configuration with an autodyne interferometer based on the laser optical feedback imaging (LOFI) method regarding their signal to noise ratios. In the heterodyne configuration, the beating between the reference beam and the signal beam is realized outside the laser cavity while in the autodyne configuration, the wave beating takes place inside the laser cavity and the relaxation oscillations of the laser intensity then play an important part. For a given laser output power, object under investigation and detection noise level, we have determined the amplification gain of the LOFI interferometer compared to the heterodyne interferometer. LOFI interferometry is demonstrated to show higher performances than heterodyne interferometry for a wide range of laser power and detection level of noise. The experimental results are in good agreement with the theoretical predictions.
Properties and observables of massive galaxies in self-interacting dark matter cosmologies
Creators: name: Mastromarino, Claudio
name: Despali, Giulia
name: Moscardini, Lauro
name: Robertson, Andrew
name: Meneghetti, Massimo
name: Maturi, Matteo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use hydrodynamical cosmological simulations to test the differences between cold and self-interacting dark matter models (CDM and SIDM) in the mass range of massive galaxies ($10^{12}M_{\odot}h^{-1}10^{13}M_{\odot}h^{-1}$) show cored profiles, while the least massive ones ($M<10^{12.5}M_{\odot}h^{-1}$) have cuspier profiles. Finally, we compare the predictions of our simulations to observational results, by looking at the dark matter fractions and the distribution of strong lensing Einstein radii. We find that in SIDM the DM-fractions decrease more rapidly with increasing stellar mass than in CDM, leading to lower fractions at $M_{*}>10^{11}M_{\odot}$, a distinctive signature of SIDM. At the same time, the distribution of Einstein radii, derived from both CDM and SIDM hydro runs, is comparable to observed samples of strong lenses with $M>10^{13}M_{\odot}h^{-1}$. We conclude that the interplay between self-interaction and baryons can greatly reduce the expected differences between CDM and SIDM models at this mass scale, and that techniques able to separate the dark and luminous mass in the inner regions of galaxies are needed to constrain self-interactions.
description: 13 pages, 12 figures
Ultrastructure aspects of shoot initiation in Nicotina tobacum L (W.38) callus cultured in vitro
Creators: name: Ross, Malcolm K.
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: QK 866 T6 R66 1972
subject: Tobacco
subject: Ultrastructure (Biology)
subject: Plant physiology

description: Bibliography: p. 86-92.
Static and dynamic response of wall-beam frames to lateral loading
Creators: name: Mee, Allen Louis
Publisher: name: University of Calgary
Year: 1973
Subjects: subject: TA 660 F7 M44 1973 Microfiche
subject: Structural frames
subject: Girders
subject: Walls - Testing
subject: Stresses and strains

description: Bibliography: p. 181-183.
Quantifier elimination in ordered abelian groups
Creators: name: Cluckers, Raf
name: Halupczok, Immanuel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 06F20 (Primary) 03C60, 03C64 (Secondary)

description: We give a new proof of quantifier elimination in the theory of all ordered abelian groups in a suitable language. More precisely, this is only "quantifier elimination relative to ordered sets" in the following sense. Each definable set in the group is a union of a family of quantifier free definable sets, where the parameter of the family runs over a set definable (with quantifiers) in a sort which carries the structure of an ordered set with some additional unary predicates. As a corollary, we find that all definable functions in ordered abelian groups are piecewise affine linear on finitely many definable pieces.
description: 30 pages
Strong On-Chip Microwave Photon-Magnon Coupling Using Ultra-low Damping Epitaxial Y3Fe5O12 Films at 2 Kelvin
Creators: name: Guo, Side
name: Russell, Daniel
name: Lanier, Joseph
name: Da, Haotian
name: Hammel, P. Chris
name: Yang, Fengyuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Y3Fe5O12 is arguably the best magnetic material for magnonic quantum information science (QIS) because of its extremely low damping. We report ultralow damping at 2 K in epitaxial Y3Fe5O12 thin films grown on a diamagnetic Y3Sc2Ga3O12 substrate that contains no rare-earth elements. Using these ultralow damping YIG films, we demonstrate for the first time strong coupling between magnons in patterned YIG thin films and microwave photons in a superconducting Nb resonator. This result paves the road towards scalable hybrid quantum systems that integrate superconducting microwave resonators, YIG film magnon conduits, and superconducting qubits into on-chip QIS devices.
Form factors of twist fields in the lattice Dirac theory
Creators: name: Gavrylenko, P.
name: Iorgov, N.
name: Lisovyy, O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study U(1) twist fields in a two-dimensional lattice theory of massive Dirac fermions. Factorized formulas for finite-lattice form factors of these fields are derived using elliptic parametrization of the spectral curve of the model, elliptic determinant identities and theta functional interpolation. We also investigate the thermodynamic and the infinite-volume scaling limit, where the corresponding expressions reduce to form factors of the exponential fields of the sine-Gordon model at the free-fermion point.
description: 20 pages, 2 figures
Strong CP violation and chiral symmetry breaking in hot and dense quark matter
Creators: name: Chatterjee, Bhaswar
name: Mishra, Hiranmaya
name: Mishra, Amruta
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate chiral symmetry breaking and strong CP violation effects in the phase diagram of strongly interacting matter. We demonstrate the effect of strong CP violating terms on the phase structure at finite temperature and densities in a 3-flavor Nambu-Jona-Lasinio (NJL) model including the Kobayashi-Maskawa-t'Hooft (KMT) determinant term. This is investigated using an explicit structure for the ground state in terms of quark-antiquark condensates for both in the scalar and the pseudoscalar channels. CP restoring transition with temperature at zero baryon density is found to be a second order transition at $θ= π$ while the same at finite chemical potential and small temperature turns out to be a first order transition. Within the model, the tri-critical point turns out to be $(T_c,μ_c)\simeq(273,94)$ MeV at $θ= π$ for such a transition.
description: 10 pages, 12 figures
Inverse semigroups of metrics on doubles related to certain subsets
Creators: name: Manuilov, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: Recently we have shown that the equivalence classes of metrics on the double of a metric space $X$ form an inverse semigroup. Here we define an inverse subsemigroup related to a family of isometric subspaces of $X$, which is more computable. As a special case, we study this subsemigroup related to the family of geodesic rays starting from the basepoint, for Euclidean spaces and for trees.
description: 9 pages
Epistemological inequality : Aboriginal labor and knowledge in the geological surveys of George Mercer Dawson, 1874-1901
Creators: name: Prkachin, Eva Jean
Publisher: name: University of British Columbia
Year: 2009

description: Historical studies of Canadian science often ignore the assistance that Aboriginal people provided to frontier scientists. Monographs and biographies detailing the extraordinary career of Canadian geological surveyor George Mercer Dawson in the late nineteenth-century subsume the role that Aboriginal people played in his explorations. Postcolonial scholarship dealing with science criticizes the low epistemological status that scientific explorers accorded to Aboriginal knowledge, but neglects how collaboration between Aboriginal people and scientists influenced the knowledge that they produced in the New World. Dawson’s journals, technical notes, and scientific publications detail the numerous types of physical and intellectual labor that Aboriginal people contributed to his surveying expeditions in western Canada, particularly British Columbia, Alberta, and the Yukon. Using Aboriginal guides, general laborers, and informants enabled Dawson to cover substantial amounts of terrain during short surveying seasons, avoid hazards and delays, make ethnological observations, and record information on regions that he did not personally visit. Despite borrowing substantial amounts of knowledge from his Aboriginal guides and informants, Dawson did not equate Indigenous knowledge with scientific epistemologies. Dawson extracted the knowledge that Aboriginal people supplied him with from its epistemological packaging, but frequently acknowledged the Indigenous origin of his information, even in highly specialized scientific publications. Dawson’s work, then, serves as a powerful reminder of Aboriginal contributions to science produced during the exploration of North America.
Quantification of the reciprocal Dunford-Pettis property
Creators: name: Kalenda, Ondřej F. K.
name: Spurný, Jiří
Publisher: name: arXiv
Year: 2012
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We prove in particular that Banach spaces of the form $C_0(Ω)$, where $Ω$ is a locally compact space, enjoy a quantitative version of the reciprocal Dunford-Pettis property.
description: 16 pages
Constraining interacting dark energy models with the halo concentration - mass relation
Creators: name: Zhao, Yu
name: Liu, Yun
name: Liao, Shihong
name: Zhang, Jiajun
name: Liu, Xiangkun
name: Du, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The interacting dark energy (IDE) model is a promising alternative cosmological model which has the potential to solve the fine-tuning and coincidence problems by considering the interaction between dark matter and dark energy. Previous studies have shown that the energy exchange between the dark sectors in this model can significantly affect the dark matter halo properties. In this study, utilising a large set of cosmological $N$-body simulations, we analyse the redshift evolution of the halo concentration - mass ($c$ - $M$) relation in the IDE model, and show that the $c$ - $M$ relation is a sensitive proxy of the interaction strength parameter $ξ_2$, especially at lower redshifts. Furthermore, we construct parametrized formulae to quantify the dependence of the $c$ - $M$ relation on $ξ_2$ at redshifts ranging from $z=0$ to $0.6$. Our parametrized formulae provide a useful tool in constraining $ξ_2$ with the observational $c$ - $M$ relation. As a first attempt, we use the data from X-ray, gravitational lensing, and galaxy rotational curve observations and obtain a tight constraint on $ξ_2$, i.e. $ξ_2 = 0.071 \pm 0.034$. Our work demonstrates that the halo $c$ - $M$ relation, which reflects the halo assembly history, is a powerful probe to constrain the IDE model.
description: 9 pages, 5 figures, 5 tables
Creep of analysis of concrete structures at normal and raised temperatures
Creators: name: Khalifa, Magdi Mohamed Ahmed
Publisher: name: University of Calgary
Year: 1976
Subjects: subject: TA 683.22 K46 1975 Microfiche
subject: Reinforced concrete construction
subject: Concrete construction
subject: Concrete - Creep
subject: Elasticity

description: Bibliography: p. 158-166.
Reducing Thermal Noise in Future Gravitational Wave Detectors by employing Khalili Etalons
Creators: name: Gurkovsky, Alexey G.
name: Heiner, Daniel
name: Hild, Stefan
name: Nawrodt, Ronny
name: Somiya, Kentaro
name: Vyatchanin, Sergey P.
name: Wittel, Holger
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Reduction of thermal noise in dielectric mirror coatings is a key issue for the sensitivity improvement in second and third generation interferometric gravitational wave detectors. Replacing an end mirror of the interferometer by an anti-resonant cavity (a so-called Khalili cavity) has been proposed to realize the reduction of the overall thermal noise level. In this article we show that the use of a Khalili etalon, which requires less hardware than a Khalili cavity, yields still a significant reduction of thermal noise. We identify the optimum distribution of coating layers on the front and rear surfaces of the etalon and compare the total noise budget with a conventional mirror. In addition we briefly discuss advantages and disadvantages of the Khalili etalon compared with the Khalili cavity in terms of technical aspects, such as interferometric length control and thermal lensing.
description: 13 pages, 9 figures
Modular Structure and Inclusions of Twisted Araki-Woods Algebras
Creators: name: da Silva, Ricardo Correa
name: Lechner, Gandalf
Publisher: name: arXiv
Year: 2022
Subjects: subject: Operator Algebras (math.OA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In the general setting of twisted second quantization (including Bose/Fermi second quantization, $S$-symmetric Fock spaces, and full Fock spaces from free probability as special cases), von Neumann algebras on twisted Fock spaces are analyzed. These twisted Araki-Woods algebras $\mathcal{L}_{T}(H)$ depend on the twist operator $T$ and a standard subspace $H$ in the one-particle space. Under a compatibility assumption on $T$ and $H$, it is proven that the Fock vacuum is cyclic and separating for $\mathcal{L}_{T}(H)$ if and only if $T$ satisfies a standard subspace version of crossing symmetry and the Yang-Baxter equation (braid equation). In this case, the Tomita-Takesaki modular data are explicitly determined. Inclusions $\mathcal{L}_{T}(K)\subset\mathcal{L}_{T}(H)$ of twisted Araki-Woods algebras are analyzed in two cases: If the inclusion is half-sided modular and the twist satisfies a norm bound, it is shown to be singular. If the inclusion of underlying standard subspaces $K\subset H$ satisfies an $L^2$-nuclearity condition, $\mathcal{L}_{T}(K)\subset\mathcal{L}_{T}(H)$ has type III relative commutant for suitable twists $T$. Applications of these results to localization of observables in algebraic quantum field theory are discussed.
Devonian megaspores and their stratigraphic significance in the Canadian Arctic
Creators: name: Chi, B. I.
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: QE 996 C45 1974 Microfiche
subject: Spores (Botany), Fossil
subject: Paleobotany - Devonian
subject: Geology - Arctic regions

description: Bibliography: p. 275-284.
The Fatigue behaviour of concrete under lateral confining pressure
Creators: name: Takhar, Surindur Singh
Publisher: name: Engineering
Year: 1972
Subjects: subject: TA 440 T34 1972 Microfilm
subject: Concrete - Testing
subject: Strains and stresses

description: Bibliography: p. 75-77.
description: The subject of this investigation is to evaluate the effect of the lateral confining pressure on the fatigue behaviour of concrete. The design and performance of the triaxial loading apparatus is described, the lateral pressure being applied hydrostatically while the longitudinal stress is applied mechanically through a balanced piston. The concrete strain was measured using calibrated internal strain gauges. The results of tests on 72 specimens, indicating the influence of the lateral confining pressure on the ultimate compressive strengi:h and strain of concrete and on the fatigue behaviour of concrete unde high (maximum) longitudinal compressive stress levels are presented. The results indicate that the fatigue life under lateral confining pressure is prolonged, depending on the maximum stress level of the fatigue loading.
Über die Herkunft eines illustrierten Breviers aus dem 13. Jahrhundert in der Trierer Stadtbibliothek
Creators: name: Kentenich, Gottfried
Publisher: name: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete
Year: 2020

description: Tafel VIII: https://doi.org/10.11588/tz.1927.4.76519
description: Trierer Zeitschrift - Archäologie und Kunst des Trierer Landes und seiner Nachbargebiete, Bd. 2 Nr. 4 (1927): Trierer Zeitschrift : Vierteljahreshefte für Geschichte und Kunst des Trierer Landes und seiner Nachbargebiete
Flash Mixing on the White Dwarf Cooling Curve: Spectroscopic Confirmation in NGC 2808
Creators: name: Brown, Thomas M.
name: Lanz, Thierry
name: Sweigart, Allen V.
name: Cracraft, Misty
name: Hubeny, Ivan
name: Landsman, Wayne B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: [Abridged] We present new HST FUV spectroscopy of 24 hot evolved stars in NGC2808, a massive globular cluster with a large population of "blue-hook" (BHk) stars. The BHk stars are found in UV color-magnitude diagrams of the most massive globular clusters, where they fall at luminosities immediately below the hot end of the horizontal branch (HB), in a region of the HR diagram unexplained by canonical stellar evolution theory. Using new evolutionary and atmospheric models, we have shown that these subluminous HB stars are very likely the progeny of stars that undergo extensive internal mixing during a late He-core flash on the white dwarf cooling curve. This flash mixing leads to hotter temperatures and an enormous enhancement of the surface He and C; these hotter temperatures, together with the decrease in H opacity shortward of the Lyman limit, make the BHk stars brighter in the EUV while appearing subluminous in the UV and optical. Our FUV spectroscopy demonstrates that, relative to normal HB stars at the same color, the BHk stars of NGC2808 are hotter and greatly enhanced in He and C, thus providing unambiguous evidence of flash mixing. Although the C abundance in the BHk stars is orders of magnitude larger than that in the normal HB stars, the C abundance in both the BHk and normal HB stars appears to be affected by gravitational settling. The variations seen in Si and the Fe-peak elements also indicate that atmospheric diffusion is at play in our sample, with all of our hot subdwarfs at 25,000 to 50,000 K exhibiting large enhancements of the Fe-peak elements. The hottest subdwarfs in our BHk sample may be pulsators, given that they fall in the temperature range of newly-discovered pulsating subdwarfs in omega Cen. In addition to the normal hot HB and BHk stars, we obtain spectra of 5 blue HB stars, a post-HB star, and 3 unclassified stars with unusually blue UV colors.
description: Accepted for publication in The Astrophysical Journal. LaTeX, 17 pages, 14 color figures
Jet quenching for heavy flavors in $AA$ and $pp$ collisions
Creators: name: Zakharov, B. G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We perform a global analysis of experimental data on jet quenching for heavy flavors for scenarios with and without quark-gluon plasma formation in $pp$ collisions. We find that the theoretical predictions for the nuclear modification factor $R_{AA}$ for heavy flavors at the LHC energies are very similar for these scenarios, and the results for $R_{AA}$ and $v_2$ agree reasonably with the LHC data. The agreement with data at the RHIC top energy becomes somewhat better for the intermediate scenario, in which the quark-gluon plasma formation in $pp$ collisions occurs only at the LHC energies. Our fits to heavy flavor $R_{AA}$ show that description of jet quenching for heavy flavors requires somewhat bigger $α_s$ than data on jet quenching for light hadrons.
description: 15 pages, 12 figures
A systematic variation of the stellar initial mass function in early-type galaxies
Creators: name: Cappellari, Michele
name: McDermid, Richard M.
name: Alatalo, Katherine
name: Blitz, Leo
name: Bois, Maxime
name: Bournaud, Frederic
name: Bureau, M.
name: Crocker, Alison F.
name: Davies, Roger L.
name: Davis, Timothy A.
name: de Zeeuw, P. T.
name: Duc, Pierre-Alain
name: Emsellem, Eric
name: Khochfar, Sadegh
name: Krajnovic, Davor
name: Kuntschner, Harald
name: Lablanche, Pierre-Yves
name: Morganti, Raffaella
name: Naab, Thorsten
name: Oosterloo, Tom
name: Sarzi, Marc
name: Scott, Nicholas
name: Serra, Paolo
name: Weijmans, Anne-Marie
name: Young, Lisa M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Much of our knowledge of galaxies comes from analysing the radiation emitted by their stars. It depends on the stellar initial mass function (IMF) describing the distribution of stellar masses when the population formed. Consequently knowledge of the IMF is critical to virtually every aspect of galaxy evolution. More than half a century after the first IMF determination, no consensus has emerged on whether it is universal in different galaxies. Previous studies indicated that the IMF and the dark matter fraction in galaxy centres cannot be both universal, but they could not break the degeneracy between the two effects. Only recently indications were found that massive elliptical galaxies may not have the same IMF as our Milky Way. Here we report unambiguous evidence for a strong systematic variation of the IMF in early-type galaxies as a function of their stellar mass-to-light ratio, producing differences up to a factor of three in mass. This was inferred from detailed dynamical models of the two-dimensional stellar kinematics for the large Atlas3D representative sample of nearby early-type galaxies spanning two orders of magnitude in stellar mass. Our finding indicates that the IMF depends intimately on a galaxy's formation history.
description: 4 pages, 2 figures, LaTeX. Accepted for publication as a Nature Letter. More information about our Atlas3D project is available at http://purl.org/atlas3d
Cosmic Sands: The Origin of Dusty, Star-forming Galaxies in the Epoch of Reionization
Creators: name: Lower, Sidney
name: Narayanan, Desika
name: Li, Qi
name: Davé, Romeel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the Cosmic Sands suite of cosmological zoom-in simulations based on the Simba galaxy formation model in order to study the build up of the first massive and dusty galaxies in the early Universe. Residing in the most massive halos, we find that the compact proto-massive galaxies undergo nearly continuous mergers with smaller subhalos, boosting star formation rates (SFRs) and the build up of stellar mass. The galaxies are already appreciably chemically evolved by z=10, with modeled dust masses comparable to those inferred from observations in the same epoch. We track gas accretion onto the galaxies to understand how extreme SFRs can be sustained by these early systems. We find that smooth gas accretion can maintain SFRs above 250 M$_{\odot}$ / yr but to achieve SFRs that boost galaxies well above the main sequence, a larger perturbation like a gas-rich major merger is necessary to trigger a starburst episode. Post-processing the Cosmic Sands simulations with dust radiative transfer, we find that while the infrared luminosities of the most dust rich galaxies are comparable to local ULIRGs, they are substantially dimmer than classical z=2 sub-millimeter galaxies. We end with a discussion on the possible reasons for this discrepancy at the highest masses and the future work we intend to carry out to study the chemical enrichment of the earliest dusty galaxies.
description: Submitted to ApJ, main text 17 pages, 12 figures. Comments welcome!
General constraints on sources of high-energy cosmic rays from the interaction losses
Creators: name: Sotirov, Simon
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Sources of high-energy cosmic rays are presently unknown, but can be constrained in various ways. Some of these constraints can be graphically presented on the so-called Hillas diagram. Previous versions of this diagram determined the range of geometrical sizes and magnetic fields of potential astrophysical accelerators, taking into account geometrical criteria and radiation losses. In this work, we update the Hillas diagram for protons, taking into account the losses associated with the $pγ$ and photopair interactions, relating the allowed regions to the source electromagnetic luminosity. The strongest constraints are obtained for bright compact sources such as the central regions of active galactic nuclei.
description: V2: extended version accepted by Phys. Rev. D
Wedge-Local Quantum Fields on a Nonconstant Noncommutative Spacetime
Creators: name: Much, Albert
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Within the framework of warped convolutions we deform the massless free scalar field. The deformation is performed by using the generators of the special conformal transformations. The investigation shows that the deformed field turns out to be wedge-local. Furthermore, it is shown that the spacetime induced by the deformation with the special conformal operators is nonconstant noncommutative. The noncommutativity is obtained by calculating the deformed commutator of the coordinates.
Early universe dynamics of PQ field with very small self-coupling and its implications for axion dark matter
Creators: name: Kozów, P.
name: Olechowski, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Axion-like particles (ALPs) are often considered as good candidates for dark matter. Several mechanisms generating relic abundance of ALP dark matter have been proposed. They may involve processes which take place before, during or after cosmic inflation. In all cases an important role is played by the potential of the corresponding Peccei-Quinn (PQ) field. Quite often this potential is assumed to be dominated by a quartic term with a very small coupling. We show that in such situation it is crucial to take into account different kinds of corrections especially in models in which the PQ field evolves during and after inflation. We investigate how such evolution changes due to radiative, thermal and geometric corrections. In many cases those changes are very important and result in strong modifications of the predictions of a model. They may strongly influence the amount of ALP contributions to cold and warm components of dark matter as well as the power spectrum of associated isocurvature perturbations. Models with a quasi-supersymmetric spectrum of particles to which the PQ field couples seem to be especially interesting. Qualitative features of such models are discussed with the help of approximate analytical formulae. However, the dynamics of the PQ field with the considered corrections taken into account is more complicated than in the case without corrections so dedicated numerical calculations are necessary to obtain precise predictions. We present such results for some characteristic benchmark points in the parameter space.
description: Discussion of axion relic density extended with results of numerical calculations added, references added. This is the Accepted Manuscript version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. Neither SISSA Medialab Srl nor IOP Publishing Ltd is responsible for any errors or omissions in this version of the manuscript or any version derived from it
Model comparison of Delta and Omega masses in a covariant Faddeev approach
Creators: name: Sanchis-Alepuz, Helios
name: Alkofer, Reinhard
name: Eichmann, Gernot
name: Williams, Richard
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We compute the vector-meson, nucleon and delta/omega-baryon masses and their evolution with the current-quark mass using a covariant generalized Bethe-Salpeter equation approach. The interaction kernel is truncated to a dressed gluon exchange. We study the model dependence of our results with the quark-gluon dressing to assess the validity of the truncation.
description: 8 pages, 1 figure, 1 table. Talk presented by H. Sanchis-Alepuz at the International Workshop on QCD Green's Functions, Confinement, and Phenomenology - QCD-TNT II, September 05-09 2011, ECT* Trento, Italy
The local and global relations between $Σ_\star$ , $Σ_{\rm SFR}$ and $Σ_{\rm mol}$ that regulate star-formation
Creators: name: Sánchez, Sebastián F.
name: Medina, Daysi C. Gómez
name: Barrera-Ballesteros, J. K.
name: Galbany, L.
name: Bolatto, A.
name: Wong, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Star-formation is one of the main processes that shape galaxies, defining its stellar population and metallicity production and enrichment. It is nowadays known that this process is ruled by a set of relations that connect three parameters: the molecular gas mass, the stellar mass and the star-formation rate itself. These relations are fulfilled at a wide range of scales in galaxies, from galaxy wide to kpc-scales. At which scales they are broken, and how universal they are (i.e., if they change at different scales or for different galaxy types) it is still an open question. We explore here how those relations compare at different scales using as proxy the new analysis done using Integral Field Spectroscopy data and CO observations data from the EDGE-CALIFA survey and the AMUSSING++ compilation.
description: 8 pages, 3 figures, 1 table, proceedings of the IAU Symposium 373: Resolving the Rise and Fall of Star Formation in Galaxies
Uniqueness of transverse solutions for reaction-diffusion equations with spatially distributed hysteresis
Creators: name: Gurevich, Pavel
name: Tikhomirov, Sergey
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K57, 35K45, 47J40

description: The paper deals with reaction-diffusion equations involving a hysteretic discontinuity in the source term, which is defined at each spatial point. Such problems describe biological processes and chemical reactions in which diffusive and nondiffusive substances interact according to hysteresis law. Under the assumption that the initial data are spatially transverse, we prove a theorem on the uniqueness of solutions. The theorem covers the case of non-Lipschitz hysteresis branches arising in the theory of slow-fast systems.
description: 11 pages, 5 figures
Angular distributions of secondary electrons in fast particle-atom scattering
Creators: name: Amusia, M. Ya.
name: Chernysheva, L. V.
name: Liverts, E. Z.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present the angular distribution of electrons knocked out from an atom in a fast charge particle collision at small momentum transfer. It is determined not only by dipole but also by quadrupole transitions, the contribution of which can be considerably enhanced as compared to the case of photoionization. There the non-dipole parameters are suppressed as compared to the dipole ones by the parameter ωR/c << 1, where is the photon energy, R is the ionized shell radius and c is the speed of light. This suppression in fast electron-atom collisions can be considerably reduced: the corresponding expansion parameter ωR/ ν<< 1 is much bigger than in photoionization, since the speed of the incoming electron is much smaller than c. In formation of the angular distribution it is decisively important that the ionizing field in collision process is longitudinal, while in photoionization - it is transversal. We illustrate the general formulas by concrete results for outer s-, p-, and some nd-subshells of multi-electron noble gas atoms Ar, Kr and Xe, at several transferred momentum values: q=0.0, 0.1, 1.1, 2.1. Even for very small transferred momentum q, i.e. in the so-called optical limit, the deviations from the photoionization case are prominent.
description: arXiv admin note: substantial text overlap with arXiv:1012.5465 and arXiv:1108.1013
Die Russische Bibliothek Zürich (RBC): Geschichte und Geschichten
Creators: name: Leimer, Miriam
Publisher: name: Zentralbibliothek Zürich
Year: 2023
Subjects: subject: 025 Bibliothekarische Tätigkeiten
subject: 891 Ostindoeuropäische, keltische Literaturen
subject: Zürich
subject: Russische Bibliothek (Zürich, 1927-1983)
subject: Russische Literatur
subject: Bibliotheksbestand
subject: Zentralbibliothek Zürich

description: Der Text erschien zuerst im Februar 2023 als Online-Beitrag auf der «Zürich»-Seite der Zentralbibliothek Zürich (https://www.zb.uzh.ch/de/zuerich).
description: Von 1927 bis 1983 bestand in Zürich ein Verein, der sich ganz der Förderung und Verbreitung slavischer Literatur verschrieben hatte. Die ehrenamtlich geführte Russische Bibliothek Zürich (RBC) bot ihren Mitgliedern – darunter Angehörige unterschiedlicher slavischer Nationen, Russlandschweizerinnen und sowjetische Dissidenten – eine grosse Auswahl russischsprachiger Titel. Der einzigartige Bücherbestand sowie das Vereinsarchiv gehören seit 2002 zur Zentralbibliothek Zürich.
Rigid supersymmetric theories in 4d Riemannian space
Creators: name: Samtleben, Henning
name: Tsimpis, Dimitrios
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider rigid supersymmetric theories in four-dimensional Riemannian spin manifolds. We build the Lagrangian directly in Euclidean signature from the outset, keeping track of potential boundary terms. We reformulate the conditions for supersymmetry as a set of conditions on the torsion classes of a suitable SU(2) or trivial G-structure. We illustrate the formalism with a number of examples including supersymmetric backgrounds with non-vanishing Weyl tensor.
description: 26 pages
The Emergence Proposal in Quantum Gravity and the Species Scale
Creators: name: Castellano, Alberto
name: Herráez, Alvaro
name: Ibáñez, Luis E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the Emergence Proposal in QG it is conjectured that all light-particle kinetic terms are absent in the fundamental UV theory and are generated by quantum corrections in the IR. It has been argued that this may provide for some microscopic understanding of the WGC and SDC. In the present paper we take the first steps towards a systematic study of Emergence in the context of string theory. We emphasize the crucial role of the species scale in any EFT coupled to gravity, and discuss its computation in string theory and general systems with light towers of states. We then introduce the notion of Emergence and show how kinetic terms for moduli, gauge bosons and fermions may be generated. One-loop computations play an important role in Emergence, so we present detailed calculations in $d$ spacetime dimensions for the wave-function renormalization of scalars, vectors and fermions. We extend and check the Emergence Proposal in a number string vacua, including 4d $\mathcal{N}=2$ theories arising from type IIA on a CY$_3$, where the towers at strong coupling are comprised by D0 and (wrapped) D2-branes, and also elaborate on how instanton corrections would fit within the emergence picture. Higher dimensional examples are also discussed, including 6d and 7d models arising from F-/M-theory on an elliptic CY$_3$ or a $K3$ surface. We also consider 10d string theories and study in some detail the emergence mechanism in type IIA. We show as well how the flux potential in 4d may be obtained from the emergence prescription, by analyzing the corresponding decompactification limits to M-theory. We find that the required kinetic terms for the dual 3-form fields can arise upon integrating out towers of massive gravitini (and bosonic superpartners). Our analysis renders support to the Emergence Proposal, and to the idea that infinite distance singularities may arise in QG as an intrinsic IR phenomenon.
description: v2: minor changes and typos corrected. 79 pages + Appendices, 11 figures, 8 tables
Local responses to climate change : an exploration of the relationship between capacity and action
Creators: name: Burch, Sarah L.
Publisher: name: University of British Columbia
Year: 2009

description: Although the development and implementation of a global greenhouse gas reduction regime has dominated policy debates since before the advent of the Kyoto Protocol (and remains a critical element of effective mitigation), communities have both direct control of critical sources of emissions (Bulkeley and Betsill, 2005, Betsill, 2001) and are the scale at which the potentially catastrophic impacts of climate change will play out (Wilbanks et al., 2007, Wilbanks et al., 2003). As this dissertation will show, communities face a unique set of challenges as they navigate through the uncertain future presented by climate change. Even so, communities bring to the task of climate change adaptation and mitigation a unique set of tools and proficiencies that are often absent at the national and international scales. It is the ultimate aim of the research presented here to enhance this toolkit so that communities might effectively employ the various forms of capacity they possess to rise to the challenge presented by climate change. Using three municipalities in the Lower Mainland of British Columbia, Canada, this dissertation explores: the various forms of capacity that are utilized in response to climate change, the roots of capacity in the underlying development path, the factors that might inhibit the effective translation of capacity into action at the local level, and strategies that might be used to transform barriers into enablers of action. The evidence presented in this dissertation indicates that barriers are deeply interwoven phenomena, which may reinforce one another and create substantial inertia behind unsustainable patterns of municipal operations. Addressing a lack of technical, financial, or human resources appears to be less a matter of creating more capacity than of facilitating the effective use of existing resources. This facilitation depends most fundamentally on re-working the path dependent institutional structures, organizational culture and policy-making procedures that have characterized the unsuccessful patterns of climate change policy development in the past. It is hoped that this work will help to elucidate the means by which the challenge of carbon neutrality and resiliency can be met by communities, and to stimulate the transformation of barriers into enablers of action.
Effective electron recombination coefficient in ionospheric D-region during the relaxation regime after solar flare from February 18, 2011
Creators: name: Nina, A.
name: Cadez, V.
name: Sulic, D.
name: Sreckovic, V.
name: Zigman, V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: In this paper, we present a model for determination of a weakly time dependent effective recombination coefficient for the perturbed terrestrial ionospheric D-region plasma. We study consequences of a class M1.0 X-ray solar flare, recorded by GOES-15 satellite on February 18, 2011 between 14:00 UT and 14:15 UT, by analyzing the amplitude and phase real time variations of very low frequency (VLF) radio waves emitted by transmitter DHO (located in Germany) at frequency 23.4 kHz and recorded by the AWESOME receiver in Belgrade (Serbia). Our analysis is limited to ionospheric perturbations localized at altitudes around 70 km where the dominant electron gain and electron loss processes are the photo-ionization and recombination respectively.
Homogeneous right coideal subalgebras of quantized enveloping algebras
Creators: name: Heckenberger, I.
name: Kolb, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 17B370, 81R50

description: For a quantized enveloping algebra of a complex semisimple Lie algebra with deformation parameter not a root of unity, we classify all homogeneous right coideal subalgebras. Any such right coideal subalgebra is determined uniquely by a triple consisting of two elements of the Weyl group and a subset of the set of simple roots satisfying some natural conditions. The essential ingredients of the proof are the Lusztig automorphisms and the classification of homogeneous right coideal subalgebras of the Borel Hopf subalgebras of quantized enveloping algebras obtained previously by H.-J. Schneider and the first named author. Key words: Quantum groups, coideal subalgebras, Weyl group, weak order
description: 13 pages
Quaternary history of Ghost River area, Alberta
Creators: name: Matt, C. Diane
Publisher: name: University of Calgary
Year: 1975
Subjects: subject: QE 696 M36 1975 Microfiche
subject: Geology, Stratigraphic - Quaternary
subject: Glacial epoch
subject: Geology - Alberta - Ghost River area

description: Bibliography: p. 85-87.
The Nominal Range of Rocky Planet Masses, Radii, Surface Gravities and Bulk Densities
Creators: name: Unterborn, Cayman T.
name: Desch, Steven J.
name: Haldemann, Jonas
name: Lorenzo, Alejandro
name: Schulze, Joseph G.
name: Hinkel, Natalie R.
name: Panero, Wendy R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The two primary observable quantities of an exoplanet--its mass and radius--alone are not sufficient to probe a rocky exoplanet's interior composition and mineralogy. To overcome this, host-star abundances of the primary planet-building elements (Mg, Si, Fe) are typically used as a proxy for the planet's bulk composition. The majority of small exoplanet hosts, however, do not have available abundance data. Here we present the open-source ExoPlex mass-radius-composition solver. Unlike previous open-source mass-radius solvers, ExoPlex calculates the core chemistry and equilibrium mantle mineralogy for a bulk composition, including effects of mantle FeO content, core light elements and surface water/ice. We utilize ExoPlex to calculate the planetary radii, surface gravities and bulk densities for 10$^6$ model planets up to 2 R$_\oplus$ across these geochemistries, adopting the distribution of FGK stellar abundances to estimate of the range of bulk exoplanet compositions. We outline the $99.7\%$ distribution of radii, surface gravity and bulk densities that define planets as "nominally rocky." Planets outside this range require compositions outside those expected from stellar abundance data, likely making them either Fe-enriched super-Mercuries, or volatile-enriched mini-Neptunes. We apply our classification scheme to a sample of 85 well-resolved exoplanets without available host-star abundances. We estimate only 9 planets are within the "nominally rocky planet zone" at $>70\%$ confidence, while $\sim20\%$ and $\sim30\%$ of this sample can be reasonably classified as super-Mercuries or volatile-rich, respectively. Our results provide observers with a self-consistent way to broadly classify a planet as likely rocky, Mercury-like or volatile-enriched, using mass and radius measurements alone.
description: 41 pages, 21 figures, 2 tables. Accepted to ApJ