cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
AMMONOIDS FROM THE ZHUGANPO MEMBER OF THE FALANG FORMATION AT NIMAIGU AND THEIR RELEVANCE FOR DATING THE XINGYI FOSSIL-LAGERSTÄTTE (LATE LADINIAN, GUIZHOU, CHINA)
Creators: name: ZOU, XIAODONG
name: BALINI, MARCO
name: JIANG, DA-YONG
name: TINTORI, ANDREA
name: SUN, ZUO-YU
name: SUN, YUAN-LIN
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Ammonoidea; Triassic; Ladinian; Taxonomy; Biostratigraphy; Xingyi; Fossil-Lagerstätten; Guizhou; China

description: We herein document the various ammonoid faunas, of which 8 are newly described taxa, recently collected from the Falang Formation at Nimaigu (Wusha) near Xingyi (Guizhou, South China) and also define their biostratigraphy, correlation and age. The sampled interval includes the Zhuganpo Member, which contains the world famous Xingyi Fossil-Lagerstätte, and the lowermost part of the overlying Wayao Member. Ammonoids are quite abundant, but preservation is usually very poor. New genera Yangites, Haoceras and Sinomeginoceras are described on the basis of four new species. The new subfamily Haoceratinae (family Trachyceratidae) is erected to accommodate Haoceras and Sinomeginoceras. Xenoprotrachyceras, Detoniceras, Ptychites, Trachyceras and Clionitites are also recognized, together with a specimen attributed with doubt to Parasturia.
Most of the faunas are endemic and typical representatives of Upper Ladinian ammonoid zones have not been recognized. A new local biostratigraphic scale is proposed, consisting of the Haoceras xingyiense zone, Trachyceras beds and Trachyceras multituberculatum zone, in stratigraphic order.
The Trachyceras beds and the Trachyceras multituberculatum zone are attributed to the Lower Carnian, but most of the bio-chronostratigraphic analysis is focused on the Haoceras xingyiense zone, because it directly overlies the vertebrate-bearing interval. Correlation of the new biozone is discussed and its stratigraphic position is referred, at least in part, to the lower Sutherlandi Zone of the North American scale. This correlation pinpoints the age of the Xingyi Fossil-Lagerstätte as middle Late Ladinian, which until now had been a matter of debate for 30+ years.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
Time Resolved Correlation measurements of temporally heterogeneous dynamics
Creators: name: Duri, Agnes
name: Bissig, Hugo
name: Trappe, Veronique
name: Cipelletti, Luca
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Time Resolved Correlation (TRC) is a recently introduced light scattering technique that allows to detect and quantify dynamic heterogeneities. The technique is based on the analysis of the temporal evolution of the speckle pattern generated by the light scattered by a sample, which is quantified by $c\_I(t,τ)$, the degree of correlation between speckle images recorded at time $t$ and $t+τ$. Heterogeneous dynamics results in significant fluctuations of $c\_I(t,τ)$ with time $t$. We describe how to optimize TRC measurements and how to detect and avoid possible artifacts. The statistical properties of the fluctuations of $c\_I$ are analyzed by studying their variance, probability distribution function, and time autocorrelation function. We show that these quantities are affected by a noise contribution due to the finite number $N$ of detected speckles. We propose and demonstrate a method to correct for the noise contribution, based on a $N\to \infty$ extrapolation scheme. Examples from both homogeneous and heterogeneous dynamics are provided. Connections with recent numerical and analytical works on heterogeneous glassy dynamics are briefly discussed.
description: 19 pages, 15 figures. Submitted to PRE
MIDDLE TRIASSIC SPIRIFEROID MENTZELIIDS (BRACHIOPODA) FROM ALPINE AND MEDITERRANEAN AREAS
Creators: name: GAETANI, MAURIZIO
name: MANTOVANI, NADIA
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Brachiopods; mentzeliids; taxonomy; Middle Triassic; internal characters

description: Ten species of mentzelioid spiriferids from several Middle Triassic localities of Alpine and Mediterranean areas are analysed both for external and internal characters. The genera Mentzelia, Paramentzelia, Koeveskallina, and the new genus Dagyssia are referred to the subfamily Mentzeliinae, whilst Tethyspira and the new genus Ptychomentzelia are referred to the subfamily Tethyspirinae. In addition, a new species (Ptychomentzelia ritensis) is described. The superfamily Mentzelioidea Dagys, 1974 is retained as a viable container of the whole group here discussed, previously split in the second edition of the Treatise in two different superfamilies.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
CALCAREOUS NANNOFOSSIL BIOSTRATIGRAPHY OF PALEOCENE TO MIDDLE EOCENE SUCCESSIONS (TERTIARY FLYSCH AUCTT.) OF THE NORTHERN APENNINES
Creators: name: CATANZARITI, RITA
name: PERILLI, NICOLA
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Biostratigraphy; Calcareous nannofossils; Paleocene; Middle Eocene; External Ligurides; Northern Apennines; Italy

description: An accurate biostratigraphic study of the Paleocene-middle Eocene calcareous nannofossils was performed on the turbiditic successions that characterize the Northern Apennines Mt. Caio, Farini d’Olmo, Mt. Sporno and Mt. Penice Units, belonging to the “Tertiary Flysch Auctt.” and referable to the External Ligurides. This geologic complex accumulated in a link key area, located between the oceanic Ligure-Piedmontese domain and the Adria continental margin. The reference biostratigraphic scheme used in the study is the recently published calcareous nannofossil biozonation proposed for the Paleogene by Agnini et al. (2014). The obtained biostratigraphic and chronostratigraphic data suggest that further investigation is needed to clarify the tectono-sedimentary evolution and to unravel the complex architecture of the External Ligurides.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
Existence of the Metal-Rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Creators: name: Yan, Yepeng
name: Du, Cuihua
name: Li, Hefan
name: Shi, Jianrong
name: Ma, Jun
name: Newberg, Heidi Jo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity stars that have a relative speed of at least 220 ${\rm km\ s^{-1}}$ with respect to the local standard of rest in the Galaxy. The rotational velocity distribution of the high-velocity stars with [Fe/H] $>-1.0$ dex can be well described by a two-Gaussian model, with peaks at $V_ϕ\sim +164.2\pm0.7$ and $V_ϕ\sim +3.0\pm0.3$ ${\rm km\ s^{-1}}$, associated with the thick disk and halo, respectively. This implies that there should exist a high-velocity thick disk (HVTD) and a metal-rich stellar halo (MRSH) in the Galaxy. The HVTD stars have the same position as the halo in the Toomre diagram and but show the same rotational velocity and metallicity as the canonical thick disk. The MRSH stars have basically the same rotational velocity, orbital eccentricity, and position in the Lindblad and Toomre diagram as the canonical halo stars, but they are more metal-rich. Furthermore, the metallicity distribution function (MDF) of our sample stars are well fitted by a four-Gaussian model, associated with the outer-halo, inner-halo, MRSH, and HVTD, respectively. Chemical and kinematic properties and age imply that the MRSH and HVTD stars may form in situ.
description: 16 pages, 14 figure, Accepted for publication in ApJ
Symmetries of dynamically equivalent theories
Creators: name: Gitman, D. M.
name: Tyutin, I. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A natural and very important development of constrained system theory is a detail study of the relation between the constraint structure in the Hamiltonian formulation with specific features of the theory in the Lagrangian formulation, especially the relation between the constraint structure with the symmetries of the Lagrangian action. An important preliminary step in this direction is a strict demonstration, and this is the aim of the present article, that the symmetry structures of the Hamiltonian action and of the Lagrangian action are the same. This proved, it is sufficient to consider the symmetry structure of the Hamiltonian action. The latter problem is, in some sense, simpler because the Hamiltonian action is a first-order action. At the same time, the study of the symmetry of the Hamiltonian action naturally involves Hamiltonian constraints as basic objects. One can see that the Lagrangian and Hamiltonian actions are dynamically equivalent. This is why, in the present article, we consider from the very beginning a more general problem: how the symmetry structures of dynamically equivalent actions are related. First, we present some necessary notions and relations concerning infinitesimal symmetries in general, as well as a strict definition of dynamically equivalent actions. Finally, we demonstrate that there exists an isomorphism between classes of equivalent symmetries of dynamically equivalent actions.
description: LaTex file, 18 pages
The homology of real subspace arrangements
Creators: name: Rains, Eric M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: Associated to any subspace arrangement is a "De Concini-Procesi model", a certain smooth compactification of its complement, which in the case of the braid arrangement produces the Deligne-Mumford compactification of the moduli space of genus 0 curves with marked points. In the present work, we calculate the integral homology of real De Concini-Procesi models, extending earlier work of Etingof, Henriques, Kamnitzer and the author on the (2-adic) integral cohomology of the real locus of the moduli space. To be precise, we show that the integral homology of a real De Concini-Procesi model is isomorphic modulo its 2-torsion with a sum of cohomology groups of subposets of the intersection lattice of the arrangement. As part of the proof, we construct a large family of natural maps between De Concini-Procesi models (generalizing the operad structure of moduli space), and determine the induced action on poset cohomology. In particular, this determines the ring structure of the cohomology of De Concini-Procesi models (modulo 2-torsion).
description: 36 pages, LaTeX. v2: Minor corrections, improvements in exposition
POLYPLACOPHORA FROM THE MIOCENE OF NORTH ITALY. PART 1: LEPTOCHITONIDAE, HANLEYIDAE, ISCHNOCHITONIDAE AND CALLISTOPLACIDAE
Creators: name: DELL’ANGELO, BRUNO
name: GIUNTELLI, PIERO
name: SOSSO, MAURIZIO
name: ZUNINO, MARTA
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Mollusca; Polyplacophora; Systematics; Miocene; North Italy

description: This study describes the chiton fauna (Mollusca, Polyplacophora) from deposits of the Miocene marine sequence of North Italy, located in Piedmont and Emilia Romagna regions. This first part of the work describes the chitons pertaining to four families: Leptochitonidae, Hanleyidae, Ischnochitonidae and Callistoplacidae. The studied fossils consist of 377 valves from 13 sites (Sciolze, Valle Ceppi, Rocco di Passerano, Albugnano, Monchio di Sarzano Casina, Villa Monti, Rio di Bocca d’Asino, Sant’Agata Fossili, Vargo, Vigoleno, Montegibbio, Borelli, and Moncucco Torinese) ranging from the Early Miocene (Burdigalian) to the Late Miocene (Messinian). We identified 16 species, 12 of which were already known, two are identified only at generic level (Stenosemus sp. A & sp. B), and two are described as new: Parachiton statianus sp. n., and Callistochiton borellianus sp. n. Some species found are particularly noteworthy; Lepidopleurus benoisti is the new name attributed to the species previously known as Middendorffia subcajetana or Gymnoplax orbignyi, based on the study of the type material; Leptochiton salicensis, previously known only from the Early Pleistocene of Salice (Messina, Sicily); Hanleya mediterranea is reported for the first time from the Miocene of Italy; Ischnochiton ligusticus, previously known only from the Early Pliocene of Western Liguria; the distribution of Stenoplax paviai, recently described from the Late Miocene (Rio di Bocca d’Asino), is extended to the Early Miocene (Langhian). A complete discussion on the chiton fauna from the North Italian Miocene, consisting of all the species treated in both parts, will be given in the second part of this work.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
OLD WORLD PORCUPINE (RODENTIA, HYSTRICIDAE) REMAINS FROM THE LATE MESSINIAN OF PIEDMONT, NW ITALY
Creators: name: COLOMBERO, SIMONE
name: PAVIA, MARCO
name: CARNEVALE, GIORGIO
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Rodentia; Hystricidae; locomotory behaviour; Messinian; Tertiary Piedmont Basin; Italy

description: The goal of this paper is to describe a single upper molar and a fragmented radius of Old World porcupines recently discovered in the latest Messinian localities of Moncucco Torinese and Verduno in the Tertiary Piedmont Basin, NW Italy. The available material can be assigned to the large-sized species Hystrix (Hystrix) depereti, rarely found in the late Turolian and early Ruscinian of Europe. A combined comparative and morphofunctional analysis of the fragmented radius suggest that Hystrix (Hystrix) depereti was characterized by a generalized terrestrial locomotory behaviour thus being very similar to extant Old World porcupines. Paleobiogeography and paleoecological consequences are also discussed.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
New Planerary Nebulae towards the Galactic bulge
Creators: name: Boumis, P.
name: Akras, S.
name: van Hoof, P. A. M.
name: Van de Steene, G. C.
name: Papamastorakis, J.
name: Lopez, J. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: New Planetary Nebulae (PNe) were discovered through an [O III] 5007 A emission line survey in the Galactic bulge region with l>0 deg. We detected 240 objects, including 44 new PNe. Deep Halpha+[N II] CCD images as well as low resolution spectra were obtained for the new PNe in order to study them in detail. Preliminary photo-ionization models of the new PNe with Cloudy resulted in first estimates of the physical parameters and abundances. They are compared to the abundances of Galactic PNe.
description: 2 pages. Contributed paper to IAU Symp. 234, ``Planetary Nebulae in our Galaxy and Beyond.''
Two substructures in the nearby stellar halo found in Gaia and RAVE
Creators: name: Li, Hefan
name: Du, Cuihua
name: Yang, Yanbin
name: Newberg, Heidi Jo
name: Ma, Jun
name: Shi, Jianrong
name: Piao, Yunsong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the second Gaia data release (Gaia DR2), combined with RAVE spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3,845 halo stars kinematically and chemically, and determine their density distribution in energy and angular momentum space. To select the substructures from overdensities, we reshuffle the velocities and estimate their significance. Two statistically significant substructures, GR-1 and GR-2, are identified. GR-1 has a high binding energy and small $z$-angular momentum. GR-2 is metal-rich but retrograde. They are both new substructure, and may be accretion debris of dwarf galaxies.
description: 8 pages, 9 figures, ApJ in press
Dynamical phase transitions and temperature induced quantum correlations in an infinite spin chain
Creators: name: De, Aditi Sen
name: Sen, Ujjwal
name: Lewenstein, Maciej
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the dynamics of entanglement in the infinite asymmetric XY spin chain, in an applied transverse field. The system is prepared in a thermal equilibrium state (ground state at zero temperature) at the initial instant, and it starts evolving after the transverse field is completely turned off. We investigate the evolved state of the chain at a given fixed time, and show that the nearest neighbor entanglement in the chain exhibits a critical behavior (which we call a dynamical phase transition), controlled by the initial value of the transverse field. The character of the dynamical phase transition is qualitatively different for short and long evolution times. We also find a nonmonotonic behavior of entanglement with respect to the temperature of the initial equilibrium state. Interestingly, the region of the initial field for which we obtain a nonmonotonicity of entanglement (with respect to temperature) is directly related to the position and character of the dynamical phase transition in the model.
description: 9 pages, 9 eps figures, RevTeX4; v2: small changes, published version
PHYLOGENETIC SIGNATURES IN THE JUVENILE SKULLS AND CHEEK TEETH OF PLEISTOCENE PROBOSCIDIPPARION SINENSE, CHINA
Creators: name: BERNOR, RAYMOND L.
name: MESHIDA, KEIKO
name: SUN, BOYANG
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Proboscidipparion sinense; skull; dentition; evolutionary relationships

description: We describe and compare three partial skulls of Chinese juvenile Proboscidipparion sinense from the Nihewanian of China. Study of the facial morphology, especially the nasal aperture, as well as cheek tooth morphology and metric data, including length versus width of the maxillary cheek teeth of dP2, 3 and 4, support the conclusion that these skulls are referable to Proboscidipparion sinense. We reaffirm that Proboscidipparion sinense is a member of the “Sivalhippus” Complex that includes the following superspecific clades: Sivalhippus, Eurygnathohippus, Plesiohipparion and Proboscidipparion.  Recent studies by Bernor and Sun (2015) suggest that Proboscidipparion is particularly closely related to Chinese Plesiohipparion, and more distantly related to Eurygnathohippus (exclusively Africa) and Sivalhippus (mostly South Asia)
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 2
REVISION OF THE FAMILY HEBETOECHIIDAE HAVLÍČEK, 1960, AND PROPOSAL OF THREE NEW RHYNCHONELLID (BRACHIOPOD) FAMILIES
Creators: name: SARTENAER, PAUL
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: Brachiopods; rhynchonellids; Hebetoechiidae; Lanceomyoniidae fam. n.; Ktenopotamorhynchidae fam. n.; Eucharitinidae fam. n.; Ktenopotamorhynchus gen. n.

description: The heterogeneous contents of various rhynchonellid families indicate that their definition is either loose or insufficient, and opens the door to diverse and sometimes contradictory interpretations. The family Hebetoechiidae Havlíček, 1960 is one of them. Its diagnosis is revised. Some genera included in it at one time or another are assigned to the following new families: Lanceomyoniidae, Ktenopotamorhynchidae, and Eucharitinidae. A new genus, Ktenopotamorhynchus, with type species K. borealiformis (Siemiradzki, 1906a) is proposed, and the genus Lanceomyonia Havlíček, 1960 is revised.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 3
The aperture for UHE tau neutrinos of the Auger fluorescence detector using a Digital Elevation Map
Creators: name: Miele, Gennaro
name: Pastor, Sergio
name: Pisanti, Ofelia
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We perform a new study of the chances of the fluorescence detector (FD) at the Pierre Auger Observatory to detect the tau leptons produced by Earth-skimming ultra high energy tau neutrinos. We present a new and more detailed evaluation of the effective aperture of the FD that considers a reliable fiducial volume for the experimental set up. In addition, we take into account the real elevation profile of the area near Auger. We find a significant increase in the number of expected events with respect to the predictions of a previous semi-analytical determination, and our results show the enhancement effect for neutrino detection from the presence of the near mountains.
description: 13 pages, 4 figures. One new figure, clarifying remarks and references added. Version accepted for publication
Polarization tensor of charged gluons in color magnetic background field at finite temperature
Creators: name: Bordag, M.
name: Skalozub, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the polarization tensor of charged gluons in a Abelian homogeneous magnetic background field at finite temperature in one loop order Lorentz background field gauge in full generality. Thereby we first determine the ten independent tensor structures. For the calculation of the corresponding form factors we use the Schwinger representation and represent form factors as double parametric integrals and a sum resulting from the Matsubara formalism used. The integrands are given explicitly in terms of hyperbolic trigonometric functions. Like in the case of neutral gluons, the polarization tensor is not transversal. Out of the tensor structures, seven are transversal and three are not. The nontransversal part follows explicitly from our calculations.
description: 28 pages, submitted to Phys.Rev.D
The Effects of Symmetries on Quantum Fidelity Decay
Creators: name: Weinstein, Yaakov S.
name: Hellberg, C. Stephen
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We explore the effect of a system's symmetries on fidelity decay behavior. Chaos-like exponential fidelity decay behavior occurs in non-chaotic systems when the system possesses symmetries and the applied perturbation is not tied to a classical parameter. Similar systems without symmetries exhibit faster-than-exponential decay under the same type of perturbation. This counter-intuitive result, that extra symmetries cause the system to behave in a chaotic fashion, may have important ramifications for quantum error correction.
description: 5 pages, 3 figures, to be published Phys. Rev. E Rapid Communication
The ring statistics - how to separate E- and B-modes of cosmic shear correlation functions on a finite interval
Creators: name: Schneider, Peter
name: Kilbinger, Martin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims. One of the main probes for systematic errors in the cosmic shear signal are the division of the shear field into E- and B-mode shear, where gravitational lensing only produces the former. As shown in a recent note, all currently used E-/B-mode separation methods for the shear correlation functions xi_pm require them to be measured to arbitrarily small and/or large separations which is of course not feasible in practice. Methods. We derive second-order shear statistics which provide a clean separation into E- and B-modes from measurements of xi_pm(theta) over a finite interval only. We call these new statistics the circle and ring statistics, respectively; the latter is obtained by an integral over the former. The mathematical properties of these new shear statistics are obtained, as well as specific expressions for applying them to observed data. Results. It is shown that an E-/B-mode separation can be performed on measurements of xi_pm over a finite interval in angular separation, using the ring statistics. We furthermore generalize this result to derive the most general class of second-order shear statistics which provide a separation of E- and B-mode shear on a given angular interval theta_min <= theta <= theta_max. Our results will be of practical use particularly for future cosmic shear surveys where highly precise measurements of the shear will become available and where control of systematics will be mandatory.
description: 10 pages, 5 figues, minor changes, matches the published version (A&A in press)
Analysis and simulation code for Rules of contact inhibition of locomotion for cells on suspended nanofibers
Creators: name: Jugroop Singh
name: Pagulayan, Aldwin
name: Camley, Brian A
name: Amrinder S Nain
Publisher: name: Zenodo
Year: 2021

description: This code and data corresponds with the paper "Rules of contact inhibition of locomotion for cells on suspended nanofibers" by Jugroop Singh, Aldwin Pagulayan, Brian A. Camley, and Amrinder S. Nain. Simulation code and analysis code primarily by Brian Camley. In the upload.zip, there are two folders: "experiment" and "simulation." experiment:
 Each of the scripts in experiment should be run individually in order to generate the figures, as well as associated p-values, etc. simulation:
 The code in simulation can be run using the "run_everything.m" script. This should recreate the relevant simulation plots and data. Note that by default this will load pre-run simulation data and show the results. It is also possible to re-run all of the simulations by setting the rerun flag = true at the beginning of the code. This code has been tested with Matlab R2020b. This code uses elements of "beeswarm.m" Ian Stevenson, CC-BY 2019, modified by Brian Camley to allow beeswarm plots with varying mark types, etc. None of this code is up to software engineering standards, and it should not be trusted to generalize; it is provided for transparency, and because it is better for science for us to share our ugly code. If there is any confusion/issue, please contact Brian Camley.
Geometric parametrization of $SO(D+1)$ phase space of all dimensional loop quantum gravity
Creators: name: Long, Gaoping
name: Lin, Chun-Yen
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: To clarify the geometric information encoded in the $SO(D+1)$ spin-network states for the higher dimensional loop quantum gravity, we generalize the twisted-geometry parametrization of the $SU(2)$ phase space for $(1+3)$ dimensional loop quantum gravity to that of the $SO(D+1)$ phase space for the all-dimensional case. The Poisson structure in terms of the twisted geometric variables suggests a new gauge reduction procedure, with respect to the discretized Gaussian and simplicity constraints governing the kinematics of the theory. Endowed with the geometric meaning via the parametrization, our reduction procedure serves to identify proper gauge freedom associated with the anomalous discretized simplicity constraints and subsequently leads to the desired classical state space of the (twisted) discrete ADM data.
The Fundamental Scaling Relations of Elliptical Galaxies
Creators: name: Robertson, B.
name: Cox, T. J.
name: Hernquist, L.
name: Franx, M.
name: Hopkins, P. F.
name: Martini, P.
name: Springel, V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (ABRIDGED) We examine the fundamental scaling relations of elliptical galaxies formed through mergers. Using hundreds of simulations to judge the impact of progenitor galaxy properties on merger remnants, we find that gas dissipation provides an important contribution to tilt in the Fundamental Plane relation. Dissipationless mergers of disks produce remnants that occupy the virial plane. As the gas content of disk galaxies is increased, the tilt of the Fundamental Plane relation increases and the slope of the Re-M_* relation steepens. For gas fractions fgas > 30%, the simulated Fundamental Plane scalings approach those observed in the K-band. In our simulations, feedback from supermassive black hole growth has only a minor influence on the stellar-mass scaling relations of spheroidal galaxies, but may play a role in maintaining the observed Fundamental Plane tilt at optical wavelengths by suppressing residual star formation in merger remnants. We estimate that \approx 40-100% of the Fundamental Plane tilt induced by structural properties owes to trends in the central total-to-stellar mass ratio M_total/M_* produced by dissipation. Lower mass systems obtain greater phase- space densities than higher mass systems, producing a galaxy mass-dependent central M_total/M_* and a corresponding tilt in the Fundamental Plane.
description: Version accepted by ApJ, 20 pages, 18 figures, resolution reduced for size
Exploiting Symmetry Reduces the Cost of Training QAOA
Creators: name: Shaydulin, Ruslan
name: Wild, Stefan M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A promising approach to the practical application of the Quantum Approximate Optimization Algorithm (QAOA) is finding QAOA parameters classically in simulation and sampling the solutions from QAOA with optimized parameters on a quantum computer. Doing so requires repeated evaluations of QAOA energy in simulation. We propose a novel approach for accelerating the evaluation of QAOA energy by leveraging the symmetry of the problem. We show a connection between classical symmetries of the objective function and the symmetries of the terms of the cost Hamiltonian with respect to the QAOA energy. We show how by considering only the terms that are not connected by symmetry, we can significantly reduce the cost of evaluating the QAOA energy. Our approach is general and applies to any known subgroup of symmetries and is not limited to graph problems. Our results are directly applicable to nonlocal QAOA generalization RQAOA. We outline how available fast graph automorphism solvers can be leveraged for computing the symmetries of the problem in practice. We implement the proposed approach on the MaxCut problem using a state-of-the-art tensor network simulator and a graph automorphism solver on a benchmark of 48 graphs with up to 10,000 nodes. Our approach provides an improvement for $p=1$ on $71.7\%$ of the graphs considered, with a median speedup of $4.06$, on a benchmark where $62.5\%$ of the graphs are known to be hard for automorphism solvers.
description: minor revision
Clayburn Company Limited Brick Plant Park & Visitor Centre
Creators: name: Houwen, Susanna Clemas
Publisher: name: University of British Columbia
Year: 2009

description: This thesis explores the issues surrounding the ruins of the Clayburn Company Ltd. Since its demolition in 1930, the original source of pride and income for the company town has become more and more invisible except in the memories of some long-term residents. Now that the village is populated by a new generation that wishes to rejuvenate and adopt the idealistic past of Clayburn Village, interest has turned to the overgrown lot where the factory once stood. For the rest of the village, the path to revitalizing Clayburn Village has been obvious. Many of the most important houses and three non-residential structures still stand and have been restored. However, only traces of the brick factory remain, leaving the options about how to pay homage more various and less obvious. This paper relates a history of Clayburn, then explores the construction of histories and the importance of artifacts to support those histories. In this case the artifacts in question are buildings. Current actions being taken to restore the built heritage of the village demonstrate the commitment on the part of residents to that means of preserving their history. Possible options are explored, from low to high levels of intervention, ranging from leaving the ruins to the attrition of time, until they finally dissolve, to building directly over the ruins with an obviously new building. The proposed plan for the site takes a stance between these two extremes. The program for the site includes a visitor's centre of modern design, that is not located where buildings previously existed, and landscape elements that mark the former locations of brick plant buildings. A careful weighing of several criteria, including the desire to impart as much information as possible, while not confusing the visitor as to antiquity or detracting from the future use of the site as a green space, resulted in the final design. The value of the experience of the ruins as a project in progress was also felt to be important.
The Palm measure and the Voronoi tessellation for the Ginibre process
Creators: name: Goldman, André
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60D05 (Primary), 60G55, 60K35 (Secondary)

description: We prove that the Palm measure of the Ginibre process is obtained by removing a Gaussian distributed point from the process and adding the origin. We obtain also precise formulas describing the law of the typical cell of Ginibre--Voronoi tessellation. We show that near the germs of the cells a more important part of the area is captured in the Ginibre--Voronoi tessellation than in the Poisson--Voronoi tessellation. Moment areas of corresponding subdomains of the cells are explicitly evaluated.
description: Published in at http://dx.doi.org/10.1214/09-AAP620 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
Creators: name: Springob, Christopher M.
name: Haynes, Martha P.
name: Giovanelli, Riccardo
name: Kent, Brian R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a homogeneous compilation of HI spectral parameters extracted from global 21 cm line spectra for some 9000 galaxies in the local universe (heliocentric velocity -200 < V_Sun < 28,000 km/s) obtained with a variety of large single dish radio telescopes but reanalyzed using a single set of parameter extraction algorithms. Corrections to the observed HI line flux for source extent and pointing offsets and to the HI line widths for instrumental broadening and smoothing are applied according to model estimates to produce a homogenous catalog of derived properties with quantitative error estimates. Where the redshift is available from optical studies, we also provide flux measurements for an additional 156 galaxies classified as marginal HI detections and rms noise limits for 494 galaxies classified as nondetections. Given the diverse nature of the observing programs contributing to it, the characteristics of the combined dataset are heterogeneous, and as such, the compilation is neither integrated HI line flux nor peak flux limited. However, because of the large statistical base and homogenous reprocessing, the spectra and spectral parameters of galaxies in this optically targeted sample can be used to complement data obtained at other wavelengths to characterize the properties of galaxies in the local universe and to explore the large scale structures in which they reside.
description: 13 pages, 9 figures, 3 external online tables, accepted for publication in ApJS
Did life originate from low-temperature areas of the Universe?
Creators: name: Krasnokutski, Serge A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The biological molecules delivered to Earth on the board of meteorites and comets were called one of the possible causes of the origin of life. Therefore, our understanding of the routes of formation of biomolecules in space should shed the light on the possibility of the existence of habitable extrasolar planets. The large abundance of organic molecules is found in the space regions with the lowest temperature. Different routes of the organics formation in these areas were suggested. In this article, we demonstrate that complex organic molecules same as important biological molecules can be formed due to the reaction of C atoms with the mantels of molecular ices covering refractory dust grains present in the interstellar medium (ISM). Having four valence electrons, C atoms act as glue joining simple non-organic molecules and converting them into organic matter. The formation of many molecules is barrierless and thus can happen at low temperature. The barrierless reaction C + NH3 + CO -> NH2CHCO attracts particular interest. The product of this reaction is an isomer of the central residue of a peptide chain and expected to be efficiently formed in the translucent molecular clouds. The polymerization of these molecules leads to the formation of proteins that according to some theories are life's first molecules. Considering a high abundance of atomic carbon in the ISM, we expect a high efficiency of the formation of a large variety of different organic molecules, and show why the amount of organic material formed by condensation of atomic carbon may be underestimated.
description: Submitted to Low Temperature Physics
MPEC 2024-A66 : 2003 QL96
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Metamimetic Games : Modeling Metadynamics in Social Cognition
Creators: name: Chavalarias, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Multiagent Systems (cs.MA)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Imitation is fundamental in the understanding of social system dynamics. But the diversity of imitation rules employed by modelers proves that the modeling of mimetic processes cannot avoid the traditional problem of endogenization of all the choices, including the one of the mimetic rules. Starting from the remark that human reflexive capacities are the ground for a new class of mimetic rules, I propose a formal framework, metamimetic games, that enable to endogenize the distribution of imitation rules while being human specific. The corresponding concepts of equilibrium - counterfactually stable state - and attractor are introduced. Finally, I give an interpretation of social differentiation in terms of cultural co-evolution among a set of possible motivations, which departs from the traditional view of optimization indexed to criteria that exist prior to the activity of agents.
description: http://jasss.soc.surrey.ac.uk/9/2/5.html
ISSN-1460-7425
Construction of linearly independent non-orthogonal AGP states
Creators: name: Dutta, Rishab
name: Chen, Guo P.
name: Henderson, Thomas M.
name: Scuseria, Gustavo E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show how to construct a linearly independent set of antisymmetrized geminal power (AGP) states, which allows us to rewrite our recently introduced geminal replacement models as linear combinations of non-orthogonal AGPs. This greatly simplifies the evaluation of matrix elements and permits us to introduce an AGP-based selective configuration interaction method, which can reach arbitrary excitation levels relative to a reference AGP, balancing accuracy and cost as we see fit.
description: 13 pages, 8 figures, 1 table, 3 appendices
MPEC 2024-A67 : 2014 BX32
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Electronic friction coefficients from the atom-in-jellium model for $Z=1-92$
Creators: name: Gerrits, Nick
name: Juaristi, J. Iñaki
name: Meyer, Jörg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The break-down of the Born-Oppenheimer approximation is an important topic in chemical dynamics on metal surfaces. In this context, the most frequently used "work-horse" is electronic friction theory, commonly relying on friction coefficients obtained from density functional theory (DFT) calculations from the early 80s based on the atom-in-jellium model. However, results are only available for a limited set of jellium densities and elements ($Z=1-18$). In this work, these calculations are revisited by investigating the corresponding friction coefficients for the entire periodic table ($Z=1-92$). Furthermore, friction coefficients obtained by including the electron density gradient on the Generalized Gradient Approximation (GGA) level are presented. Finally, we show that spin polarization and relativistic effects can have sizeable effects on these friction coefficients for some elements.
description: 30 pages, 10 figues, accepted at Physical Review B
MPEC 2024-A68 : 2015 KQ57
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Inter-slice Context Residual Learning for 3D Medical Image Segmentation
Creators: name: Zhang, Jianpeng
name: Xie, Yutong
name: Wang, Yan
name: Xia, Yong
Publisher: name: arXiv
Year: 2020
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Automated and accurate 3D medical image segmentation plays an essential role in assisting medical professionals to evaluate disease progresses and make fast therapeutic schedules. Although deep convolutional neural networks (DCNNs) have widely applied to this task, the accuracy of these models still need to be further improved mainly due to their limited ability to 3D context perception. In this paper, we propose the 3D context residual network (ConResNet) for the accurate segmentation of 3D medical images. This model consists of an encoder, a segmentation decoder, and a context residual decoder. We design the context residual module and use it to bridge both decoders at each scale. Each context residual module contains both context residual mapping and context attention mapping, the formal aims to explicitly learn the inter-slice context information and the latter uses such context as a kind of attention to boost the segmentation accuracy. We evaluated this model on the MICCAI 2018 Brain Tumor Segmentation (BraTS) dataset and NIH Pancreas Segmentation (Pancreas-CT) dataset. Our results not only demonstrate the effectiveness of the proposed 3D context residual learning scheme but also indicate that the proposed ConResNet is more accurate than six top-ranking methods in brain tumor segmentation and seven top-ranking methods in pancreas segmentation. Code is available at https://git.io/ConResNet
description: Accpeted by IEEE-TMI
A modification of Einstein-Schrodinger theory that contains both general relativity and electrodynamics
Creators: name: Shifflett, J. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We modify the Einstein-Schrodinger theory to include a cosmological constant $Λ_z$ which multiplies the symmetric metric, and we show how the theory can be easily coupled to additional fields. The cosmological constant $Λ_z$ is assumed to be nearly cancelled by Schrodinger's cosmological constant $Λ_b$ which multiplies the nonsymmetric fundamental tensor, such that the total $Λ=Λ_z+Λ_b$ matches measurement. The resulting theory becomes exactly Einstein-Maxwell theory in the limit as $|Λ_z|\to\infty$. For $|Λ_z|\sim 1/(Planck length)^2$ the field equations match the ordinary Einstein and Maxwell equations except for extra terms which are $<10^{-16}$ of the usual terms for worst-case field strengths and rates-of-change accessible to measurement. Additional fields can be included in the Lagrangian, and these fields may couple to the symmetric metric and the electromagnetic vector potential, just as in Einstein-Maxwell theory. The ordinary Lorentz force equation is obtained by taking the divergence of the Einstein equations when sources are included. The Einstein-Infeld-Hoffmann (EIH) equations of motion match the equations of motion for Einstein-Maxwell theory to Newtonian/Coulombian order, which proves the existence of a Lorentz force without requiring sources. This fixes a problem of the original Einstein-Schrodinger theory, which failed to predict a Lorentz force. An exact charged solution matches the Reissner-Nordstrom solution except for additional terms which are $\sim 10^{-66}$ of the usual terms for worst-case radii accessible to measurement. An exact electromagnetic plane-wave solution is identical to its counterpart in Einstein-Maxwell theory.
description: fixed 2 references, accepted by "General Relativity and Gravitation"
OLDEST STEM TELEOSTEI FROM THE LATE LADINIAN (MIDDLE TRIASSIC) OF SOUTHERN CHINA
Creators: name: TINTORI, ANDREA
name: SUN, ZUOYU
name: NI, PEIGANG
name: LOMBARDO, CRISTINA
name: JIANG, DAYONG
name: MOTANI, RYOSUKE
Publisher: name: Università degli Studi di Milano
Year: 2015
Subjects: New taxa; Pholidophoriformes; Ladinian; Teleostean origin; Guizhou

description: The origin of the largest modern vertebrate group, the Teleostei, saw major refinements in the last decades, thanks to newly discovered and stratigraphically closely spaced Triassic Lagerstätten. Here we report the oldest Pholidophoriformes (stem teleosts) that were collected during a large scale yet detailed excavation of Upper Ladinian (Middle Triassic) marine deposits in Xingyi City, Guizhou Province, China. Taxonomic comparisons support the erection of a new pholidophorid genus, Malingichthys gen. nov., with two species. The new genus shows a partially fused skull roof, a preopercular bone with a hockey-stick shape and, for the first time in Pholidophoridae, supraneural elements. Most Triassic marine vertebrate clades (fishes and reptiles, Malingichthys included) first emerged in the South China Block, with Late Ladinian most showing an important faunal transformation that was strengthened by our last findings. The material here described is about 2 million years older than the previous records for pholidophorids.
description: Rivista italiana di Paleontologia e Stratigrafia, Vol 121, No 3