cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Guided Curriculum Learning for Walking Over Complex Terrain
Creators: name: Tidd, Brendan
name: Hudson, Nicolas
name: Cosgun, Akansel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Reliable bipedal walking over complex terrain is a challenging problem, using a curriculum can help learning. Curriculum learning is the idea of starting with an achievable version of a task and increasing the difficulty as a success criteria is met. We propose a 3-stage curriculum to train Deep Reinforcement Learning policies for bipedal walking over various challenging terrains. In the first stage, the agent starts on an easy terrain and the terrain difficulty is gradually increased, while forces derived from a target policy are applied to the robot joints and the base. In the second stage, the guiding forces are gradually reduced to zero. Finally, in the third stage, random perturbations with increasing magnitude are applied to the robot base, so the robustness of the policies are improved. In simulation experiments, we show that our approach is effective in learning walking policies, separate from each other, for five terrain types: flat, hurdles, gaps, stairs, and steps. Moreover, we demonstrate that in the absence of human demonstrations, a simple hand designed walking trajectory is a sufficient prior to learn to traverse complex terrain types. In ablation studies, we show that taking out any one of the three stages of the curriculum degrades the learning performance.
description: Submitted to Australasian Conference on Robotics and Automation (ACRA) 2020
7Be(p,gamma)8B S-factor from ab initio no-core shell model wave functions
Creators: name: Navratil, P.
name: Bertulani, C. A.
name: Caurier, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Nuclear structure of 7Be, 8B and 7,8Li is studied within the ab initio no-core shell model (NCSM). Starting from high-precision nucleon-nucleon (NN) interactions, wave functions of 7Be and 8B bound states are obtained in basis spaces up to 10 hbar Omega and used to calculate channel cluster form factors (overlap integrals) of the 8B ground state with 7Be+p. Due to the use of the harmonic oscillator (HO) basis, the overlap integrals have incorrect asymptotic properties. We fix this problem in two alternative ways. First, by a Woods-Saxon (WS) potential solution fit to the interior of the NCSM overlap integrals. Second, by a direct matching with the Whittaker function. The corrected overlap integrals are then used for the 7Be(p,gamma)8B S-factor calculation. We study the convergence of the S-factor with respect to the NCSM HO frequency and the model space size. Our S-factor results are in agreement with recent direct measurement data. We also test the spectroscopic factors and the corrected overlap integrals from the NCSM in describing the momentum distributions in knockout reactions with 8B projectiles. A good agreement with the available experimental data is also found, attesting the overall consistency of the calculations.
description: 18 pages, 26 figures
Ultrahigh flexoelectric effect of 3D interconnected porous polymers: modelling and verification
Creators: name: Zhang, Mingyuan
name: Yan, Dongze
name: Wang, Jianxiang
name: Shao, Li-Hua
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Non-conductive materials like rubbers, plastics, ceramics, and even semiconductors have the property of flexoelectricity, which means that they can generate electricity when bent and twisted. However, an irregular shape or a peculiar load has been the necessary condition to realize flexoelectricity, and the weight and deformability specific ratios of flexoelectricity of solids are limited. In this work, we develop a theoretical model of flexoelectricity of three-dimensional interconnected porous materials. Compared to the solid materials, porous materials can exhibit flexoelectricity under arbitrary loading forms due to their complex microstructures, and the weight and deformability specific flexoelectric output is much higher than that of the solids. Then, we verify the model by measuring the flexoelectric response of polydimethylsiloxane (PDMS) and porous polyvinylidene fluoride (PVDF). The porous PDMS with 3D micron-scale interconnected structures exhibits two orders of magnitude higher weight and deformability specific flexoelectric output than that of the solid truncated pyramid PDMS. The flexoelectric signal is found to be linearly proportional to the applied strain, the microstructural size and the frequency. Finally, we apply the theory to a more practical bending sensor, and demonstrate its stable functioning and accurate response. Our model can be applied to other porous materials, and the results highlight the new potential of porous micro-structured materials with a significant flexoelectric effect in the fields of mechanical sensing, actuating, energy harvesting, and biomimetics as light-weight materials.
description: 29 pages,13 figures
Usefulness of classical communication for local cloning of entangled states
Creators: name: Demkowicz-Dobrzanski, Rafal
name: Lewenstein, Maciej
name: De, Aditi Sen
name: Sen, Ujjwal
name: Bruss, Dagmar
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We solve the problem of the optimal cloning of pure entangled two-qubit states with a fixed degree of entanglement using local operations and classical communication. We show, that amazingly, classical communication between the parties can improve the fidelity of local cloning if and only if the initial entanglement is higher than a certain critical value. It is completely useless for weakly entangled states. We also show that bound entangled states with positive partial transpose are not useful as a resource to improve the best local cloning fidelity.
description: 6 pages, RevTeX4, 2 figures, published version
A STUDY OF AGRICULTURAL PRODUCTIVITY IN CHILALO DISTRICT OF ETHIOPIA AND THE THIRD FIVE YEAR DEVELOPMENT PLAN
Creators: name: Solomon, Seyoum
name: Solomon, Seyoum
Publisher: name: Unknown
Year: 1971
Subjects: Productivity Analysis

description: Agriculture is the largest sector in Ethiopia's economy, it accounts for about two-thirds of the gross domestic product, employs about nine-tenths of the labor force and provides nearly all the export earnings. The smallholder farms, on which 90 percent of the nation's population depends for its food supply, have been unable to raise their productivity due to many persisting problems. Unlike many developing Asian countries, Ethiopia does not face shortages in cultivable land. During the past twenty years, many strategies have been developed to modernize Ethiopia's agriculture and bring her economy up the ladder of development. Ethiopia is now in the third year of the Third Five-Year Development Plan. However, the pace of development has not accelerated as fast as it might have. This paper argues that the Third Five-Year Development Plan for Ethiopia's agriculture is rather ambitious for the present resource endowments of the country. And, in order to have a solid base for development, a more realistic and moderate approach which would have attacked the grass-root problems first, should have been taken.
On the Mini-Superambitwistor Space and N=8 Super Yang-Mills Theory
Creators: name: Saemann, Christian
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a new supertwistor space suited for establishing a Penrose-Ward transform between certain bundles over this space and solutions to the N=8 super Yang-Mills equations in three dimensions. This mini-superambitwistor space is obtained by dimensional reduction of the superambitwistor space, the standard superextension of the ambitwistor space. We discuss in detail the construction of this space and its geometry before presenting the Penrose-Ward transform. We also comment on a further such transform for purely bosonic Yang-Mills-Higgs theory in three dimensions by considering third order formal "sub-neighborhoods" of a mini-ambitwistor space.
description: 24 pages, revised and published version
Localized brane-world black hole analytically connected to an AdS$_5$ boundary
Creators: name: Nakas, Theodoros
name: Kanti, Panagiota
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct from first principles the geometry of an analytic, exponentially localized five-dimensional brane-world black hole. The black-hole singularity lies entirely on the 3-brane, while the event horizon is shown to have a pancake shape. The induced line-element on the brane assumes the form of the Schwarzschild solution while the bulk geometry is effectively AdS$_5$ outside the horizon. The derived geometry is supported by an anisotropic fluid in the bulk described only by two independent components, the energy density and tangential pressure, whereas no matter needs to be introduced on the brane for its consistent embedding in the bulk.
description: 7 pages, 3 figures, version to appear in Phys. Lett. B, typos corrected, references updated, appendix added
AN ANALYSIS OF THE IMPACT OF MICHIGAN ECONOMIC INCENTIVE LEGISLATION
Creators: name: Cook, Roberta L.
name: Cook, Roberta L.
Publisher: name: Unknown
Year: 1984
Subjects: Community/Rural/Urban Development
Public Economics

description: In the appendix to this paper an overview of Michigan economic incentive legislation is presented (MSU Ag Econ Staff paper No. 79-79). This described Michigan's economic incentive program without conducting an analysis of the consequences of the program. The purpose of the following discussion is to analyze the impact of economic incentives, providing some insights into the incidence of benefits and costs resulting from Michigan's economic development program. This discussion is comprised of four parts: 1) The relationship between tax levels, industrial revenue bond financing, and economic growth; 2) A description of industrial revenue bond use on a national level, Michigan's program placed into perspective; 3) Summary and discussion of the results of "The Plant Location Survey" and other Office of Economic Development (OED) publications analyzing the impact of Act 198; and 4) Policy alternative and conclusions.
Precise half-life measurement of the 26Si ground state
Creators: name: Matea, I.
name: Souin, J.
name: Aysto, J.
name: Blank, B.
name: Delahaye, P.
name: Elomaa, V. -V.
name: Eronen, T.
name: Giovinazzo, J.
name: Hager, U.
name: Hakala, J.
name: Huikari, J.
name: Jokinen, A.
name: Kankainen, A.
name: Moore, I. D.
name: Pedroza, J. -L.
name: Rahaman, S.
name: Rissanen, J.
name: Ronkainen, J.
name: Saastamoinen, A.
name: Sonoda, T.
name: Weber, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The beta-decay half-life of 26Si was measured with a relative precision of 1.4*10e3. The measurement yields a value of 2.2283(27) s which is in good agreement with previous measurements but has a precision that is better by a factor of 4. In the same experiment, we have also measured the non-analogue branching ratios and could determine the super-allowed one with a precision similar to the previously reported measurements. The experiment was done at the Accelerator Laboratory of the University of Jyvaskyla where we used the IGISOL technique with the JYFLTRAP facility to separate pure samples of 26Si.
description: 8 pages, 7 figures; accepted by EPJA
Recording of elicitation on tonal configurations
Creators: name: Nimbaye, Hélène
name: Lionnet, Florian
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: pri

description: 2 WAV files, 2 ELAN files, 1 PDF. Elicitation of words and sentences illustrating various tonal configurations, including phonolgical downstep, underlying downstep, and sequences of different types of tonal enclitics. The data were collected for work on phonological downstep in the language and the role of prosodic structure. Data from this elicitation session serve as the basis of an analysis of the role of the prosodic colon in the tone system of Paicî, published in 2019, and included in the bundle: [Lionnet, Florian. 2019. The colon as a separate prosodic category: Tonal evidence from Paicî (Oceanic, New Caledonia). In Proceedings of the 36th West Coast Conference on Formal Linguistics (WCCFL 36), ed. Richard Stockwell et al., 250-259. Somerville, MA: Cascadilla Proceedings Project. www.lingref.com, document #3469.]
THE FOOD CHALLENGE IN THE SENEGALESE RURAL ECONOMY AN ANALYSIS OF THE DOMESTIC CEREALS PROMOTION POLICY
Creators: name: Gaye, Matar
name: Gaye, Matar
Publisher: name: Unknown
Year: 1983
Subjects: Crop Production/Industries
Food Security and Poverty

description: Since the colonial era, the expansion of the Senegalese economy was greatly sustained by the agricultural sector in which more than three-fourths of the total population were involved. A 2.3 percent average annual growth of total production during the sixties matched the speed at which the agricultural population was growing and the rural economy was engaged in a kind of equilibrium path. During the late sixties and early seventies, the situation began to change with an agricultural production growth rate dropping to the neighborhood of 1.3 percent against 2.8 percent for total population. Such a situation which is prevailing at the present time is seriously striking if we know that the agricultural sector should produce not only enough food for a rapidly growing population, but also raw materials for the development of local industries, mostly based on peanut and cotton. Per capita food production has been very unstable with large annual fluctuations but the trend has been clearly declining. World Bank experts noted that this situation is observed in the more general setting of Sub-Saharan Africa and especially the Sahel region of which Senegal is part. They observed that this phenomenon occurred over a period when local authorities and foreign aid focused more than ever before on food production projects. In the specific setting of Senegal, food problems have been a major policy issue since the early years of the drought, but some analysts support that a trend of shortage was already clear by 1960, the year of independence. The present food crisis is the result of various causes that have been in play for a long time.
THE EFFECTS OF RESIDENTIAL MINIMUM LOT SIZE ZONING ON LAND DEVELOPMENT: THE CASE OF OAKLAND COUNTY, MICHIGAN
Creators: name: Foley, Brian P.
name: Foley, Brian P.
Publisher: name: Unknown
Year: 2004
Subjects: Land Economics/Use

description: Considerable theoretical and empirical debate has addressed the effects of minimum lot size zoning regulations on the development of land. The direction of this relationship certainly has relevance for policy. Previous studies have used econometric techniques to estimate this relationship. This paper uses a land use share multiple regression model in which the dependent variable is the natural logarithm of the ratio of acres developed from 1990-2000 to acres not developed over the same time period. It builds on previous studies by using a weighted average minimum lot size variable rather than a simple dummy variable and by explicitly considering the change in developed land area in the dependent variable. The study area is Oakland County, Michigan, a suburb of Detroit that is experiencing significant suburban development. Results show that there is a quadratic relationship between average minimum lot size and land development. At first, development declines with minimum lot size, but at a diminishing rate. Then, at approximately 5.15 acres (224,330 square feet), development begins to increase with minimum lot size at an increasing rate.
Inequity Aversion May Increase Inequity
Creators: name: Montero, Maria
name: Montero, Maria
Publisher: name: Unknown
Year: 2006
Subjects: Financial Economics

description: Inequity aversion models have been used to explain equitable payoff divisions in bargaining games. I show that inequity aversion can actually increase the asymmetry of payoff division if unanimity is not required. This is due to the analogy between inequity aversion and risk aversion. Inequity aversion may also affect comparative statics: the advantage of being proposer can decrease as players become more impatient.
A Weak Bargaining Set for Contract Choice Problems
Creators: name: Lahiri, Somdeb
name: Lahiri, Somdeb
Publisher: name: Unknown
Year: 2006
Subjects: Financial Economics

description: In this paper, we consider the problem of choosing a set of multi-party contracts, where each coalition of agents has a non-empty finite set of feasible contracts to choose from. We call such problems, contract choice problems. The main result of this paper states that every contract choice problem has a non-empty weak bargaining set. The need for such a solution concept which is considerably weaker than the core arises, since it is well known that even for very simple contract choice problems, the core may be empty. We also show by means of an example that the bargaining set due to Mas-Colell (1989), as well as a weaker version of it, may be empty for contract choice problems, thereby implying that the weakening we suggest is in some ways 'tight'
Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection
Creators: name: Baym, Gordon
name: Peng, Jen-Chieh
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Since decoupling in the early universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of the XENON1T experiment possibly finding a large magnetic moment of solar neutrinos, we estimate the helicity flipping for relic neutrinos in both cosmic and galactic magnetic fields. The flipping probability is sensitive both to the neutrino magnetic moment and the structure of the magnetic fields, thus potentially a probe of the fields. As we find, even a magnetic moment well below that suggested by XENON1T could significantly affect relic neutrino helicities and their detection rate via inverse tritium beta decay.
description: 7 pages, 1 figure, typos corrected, references added, to be published in Phys. Rev. Lett
A Taxonomy of Myopic Stability Concepts for Hedonic Games
Creators: name: Sung, Shao Chin
name: Dimitrov, Dinko
name: Sung, Shao Chin
name: Dimitrov, Dinko
Publisher: name: Unknown
Year: 2006
Subjects: Institutional and Behavioral Economics

description: We present a taxonomy of myopic stability concepts for hedonic games in terms of deviations, and discuss the status of the existence problems of stable coalition tructures. In particular, we show that contractual strictly core stable coalition tructures always exist, and provide sufficient conditions for the existence of contractually Nash stable and weak individually stable coalition structures on the class of separable games.
On the theory underlying the Car-Parrinello method and the role of the fictitious mass parameter
Creators: name: Tangney, Paul
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The theory underlying the Car-Parrinello extended-lagrangian approach to {\em ab initio} molecular dynamics (CPMD) is reviewed and reexamined using 'heavy' ice as a test system. It is emphasized that the adiabatic decoupling in CPMD is not a decoupling of electronic orbitals from the ions but only a decoupling of a subset of the orbital vibrational modes from the rest of the necessarily-coupled system of orbitals and ions. Recent work (J. Chem. Phys. {\bf 116}, 14 (2002)) has pointed out that, due to the orbital-ion coupling that remains once adiabatic-decoupling has been achieved, a large value of the fictitious mass $μ$ can lead to systematic errors in the computed forces in CPMD. These errors are further investigated in the present work with a focus on those parts of these errors that are not corrected simply by rescaling the masses of the ions. It is suggested that any comparison of the efficiencies of Born-Oppenheimer molecular dynamics (BOMD) and CPMD should be performed at a similar level of accuracy. If accuracy is judged according to the average magnitude of the systematic errors in the computed forces, the efficiency of BOMD compares more favorably to that of CPMD than previous comparisons have suggested.
description: The following article has been accepted by The Journal of Chemical Physics. After it is published, it will be found at http://jcp.aip.org/
Bounded Rationality and Repeated Network Formation
Creators: name: Beal, Sylvain
name: Querou, Nicolas
name: Beal, Sylvain
name: Querou, Nicolas
Publisher: name: Unknown
Year: 2006
Subjects: Institutional and Behavioral Economics

description: We define a finite-horizon repeated network formation game with consent, and study the differences induced by different levels of individual rationality. We prove that perfectly rational players will remain unconnected at the equilibrium, while nonempty equilibrium networks may form when, following Neyman (1985), players are assumed to behave as finite automata. We define two types of equilibria, namely the Repeated Nash Network (RNN), in which the same network forms at each period, and the Repeated Nash Equilibrium (RNE), in which different networks may form. We state a sufficient condition under which a given network may be implemented as a RNN. Then, we provide structural properties of RNE. For instance, players may form totally different networks at each period, or the networks within a given RNE may exhibit a total order relationship. Finally we investigate the question of efficiency for both Bentham and Pareto criteria.
Quantum theory based on real numbers can be experimentally falsified
Creators: name: Renou, Marc-Olivier
name: Trillo, David
name: Weilenmann, Mirjam
name: Le, Thinh P.
name: Tavakoli, Armin
name: Gisin, Nicolas
name: Acin, Antonio
name: Navascues, Miguel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While complex numbers are essential in mathematics, they are not needed to describe physical experiments, expressed in terms of probabilities, hence real numbers. Physics however aims to explain, rather than describe, experiments through theories. While most theories of physics are based on real numbers, quantum theory was the first to be formulated in terms of operators acting on complex Hilbert spaces. This has puzzled countless physicists, including the fathers of the theory, for whom a real version of quantum theory, in terms of real operators, seemed much more natural. In fact, previous works showed that such "real quantum theory" can reproduce the outcomes of any multipartite experiment, as long as the parts share arbitrary real quantum states. Thus, are complex numbers really needed in the quantum formalism? Here, we show this to be case by proving that real and complex quantum theory make different predictions in network scenarios comprising independent states and measurements. This allows us to devise a Bell-like experiment whose successful realization would disprove real quantum theory, in the same way as standard Bell experiments disproved local physics.
description: 21 pages. Some typos corrected in the analytic proof, new discussion about the use of tensor products to model space-like separation in quantum field theory, short introduction to non-local real quantum models reproducing the predictions of quantum theory, compendium of theoretical arguments against real quantum theory, real quantum simulation of joint measurements of independent preparations
Cooperation, Stability and Self-Enforcement in International Environmental Agreements: A Conceptual Discussion
Creators: name: Chander, Parkash
name: Tulkens, Henry
name: Chander, Parkash
name: Tulkens, Henry
Publisher: name: Unknown
Year: 2006
Subjects: Environmental Economics and Policy

description: In essence, any international environmental agreement (IEA) implies cooperation of a form or another. The paper seeks for logical foundations of this. It first deals with how the need for cooperation derives from the public good aspect of the externalities involved, as well as with where the source of cooperation lies in cooperative game theory. In either case, the quest for efficiency is claimed to be at the root of cooperation. Next, cooperation is considered from the point of view of stability. After recalling the two competing concepts of stability in use in the IEA literature, new insights on the nature of the gamma core in general are given as well as of the Chander-Tulkens solution within the gamma core. Free riding is also evaluated in relation with the alternative forms of stability under scrutiny. Finally, it is asked whether with the often mentioned virtue of self enforcement' any conceptual gain is achieved, different from what is meant by efficiency and stability. A skeptical answer is offered, as a reply to Barrett's (2003) attempt at giving the notion a specific content.
A topological sigma model of biKaehler geometry
Creators: name: Zucchini, Roberto
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: BiKaehler geometry is characterized by a Riemannian metric g_{ab} and two covariantly constant generally non commuting complex structures K_+^a_b, K_-^a_b, with respect to which g_{ab} is Hermitian. It is a particular case of the biHermitian geometry of Gates, Hull and Roceck, the most general sigma model target space geometry allowing for (2,2) world sheet supersymmetry. We present a sigma model for biKaehler geometry that is topological in the following sense: i) the action is invariant under a fermionic symmetry delta; ii) delta is nilpotent on shell; iii) the action is delta--exact on shell up to a topological term; iv) the resulting field theory depends only on a subset of the target space geometrical data. The biKaehler sigma model is obtainable by gauge fixing the Hitchin model with generalized Kaehler target space. It further contains the customary A topological sigma model as a particular case. However, it is not seemingly related to the (2,2) supersymmetric biKaehler sigma model by twisting in general.
description: 46 pages; Latex
Formation of Segregated and Integrated Groups
Creators: name: Watts, Alison
name: Watts, Alison
Publisher: name: Unknown
Year: 2006
Subjects: Institutional and Behavioral Economics

description: A model of group formation is presented where the number of groups is fixed and a person can only join a group if the group's members approve the person's joining. Agents have either local status preferences (each agent wants to be the highest status agent in his group) or global status preferences (each agent wants to join the highest status group that she can join). For both preference types, conditions are provided which guarantee the existence of a segregated stable partition where similar people are grouped together and conditions are provided which guarantee the existence of an integrated stable partition where dissimilar people are grouped together. Additionally, in a dynamic framework we show that if a new empty group is added to a segregated stable partition, then integration may occur.
Naturwissenschaft und Theologie zwischen Objektivität und gesellschaftlicher Verantwortung
Creators: name: Hübner, Jürgen
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 29 Nr. 1 (1980): Ökumenische Rundschau, Band 29, Heft 1
CP Violation in Rare Lepton-Number-Violating $W$ Decays at the LHC
Creators: name: Najafi, Fatemeh
name: Kumar, Jacky
name: London, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Some models of leptogenesis involve a quasi-degenerate pair of heavy neutrinos $N_{1,2}$ whose masses can be small, $O({\rm GeV})$. Such neutrinos can contribute to the rare lepton-number-violating (LNV) decay $W^\pm \to \ell_1^\pm \ell_2^\pm (q'{\bar q})^\mp$. If both $N_1$ and $N_2$ contribute, there can be a CP-violating rate difference between the LNV decay of a $W^-$ and its CP-conjugate decay. In this paper, we examine the prospects for measuring such a CP asymmetry $A_{\rm CP}$ at the LHC. We assume a value for the heavy-light neutrino mixing parameter $|B_{\ell N}|^2 = 10^{-5}$, which is allowed by the present experimental constraints, and consider $5~{\rm GeV} \le M_N \le 80~{\rm GeV}$. We consider three versions of the LHC -- HL-LHC, HE-LHC, FCC-hh -- and show that small values of the CP asymmetry can be measured at $3σ$, in the range $1\% \lesssim A_{\rm CP} \lesssim 15\%$.
description: 19 pages, 2 figures, (i) we have made the motivation more generic, so that it refers to any leptogenesis model that contains a quasi-Dirac pair of almost-degenerate neutrinos, not just the nuMSM,(ii) we focus only on the l^- l^- (q' qbar)^+ final state, since it is purely LNV (the trilepton final state has both LNV and LNC contributions). We have also added references and corrected typos."
Recording of elicitation on coarticulatory effect of palatal consonants
Creators: name: X, Aman
name: Lionnet, Florian
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: cam

description: 2 WAV files, 2 ELAN files, 2 TextGrid files. Elicitation of a word list illustrating the coarticulatory effect of palatal consonants on an adjacent back rounded vowel (JV[+bk,+rd], and of a back rounded vowel on a front (unrounded) vowel in the preceding syllable, V[-bk]CV[+bk,+rd].
United We Vote
Creators: name: Eguia, Jon X.
name: Eguia, Jon X.
Publisher: name: Unknown
Year: 2006
Subjects: Political Economy

description: This paper studies the advantages that a coalition of agents obtains by forming a voting bloc to pool their votes and cast them all together. We identify the necessary and sufficient conditions for an agent to benefit from the formation of the voting bloc, both if the agent is a member of the bloc and if the agent is not part of the bloc. We also determine whether individual agents prefer to participate in or step out of the bloc, and we find the different optimal internal voting rules that aggregate preferences within the coalition.
The open story of the magnetic fluxes
Creators: name: Bianchi, Massimo
name: Trevigne, Elisa
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the effects of oblique internal magnetic fields on the spectrum of type I superstrings compactified on tori. In particular we derive general formulae for the magnetic shifts and multiplicities of open strings connecting D9-branes with arbitrary magnetic fluxes. We discuss the flux induced potential and offer an interpretation of the stabilization of R-R moduli associated to deformations of the complex structure of T^6 in terms of non-derivative mixing with NS-NS moduli. Finally we briefly comment on how to extract other low energy couplings and generalize our results to toroidal orbifolds and other configurations governed by rational conformal field theories on the worldsheet.
description: 36 pages, LaTeX, References added
Design of a low-cost high voltage rectifier for experiments with DC arcs
Creators: name: Guerra Calvo, Victor
Publisher: name: Zenodo
Year: 2024

description: This project involves the evaluation and comparison of various methods for high voltage DC generation,within the context of DC arc experimentation. A method will be selected and subsequently implemented intoa functional prototype, with the construction process and ensuing experiments being thoroughly documentedto create an accurate simulation model of the real system. Additional auxiliary systems will also be designedto aid or automate the operation of the main system. During the project’s elaboration, the shortcomingsof distribution transformer reliant methods come to light, prompting a change of HV generation methodtowards one involving highly inductive resonant transformers. In the end, this method proved fruitful as itwas able to produce long-lasting, lengthy arcs while being powered at a considerably low voltage.
Multitracer cosmological line intensity mapping mock lightcone simulation
Creators: name: Yang, Shengqi
name: Somerville, Rachel S.
name: Pullen, Anthony R.
name: Popping, Gergö
name: Breysse, Patrick C.
name: Maniyar, Abhishek S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Sub-millimeter emission lines are important tracers of the cold gas and ionized environments of galaxies and are the targets for future line intensity mapping surveys. Physics-based simulations that predict multiple emission lines arising from different phases of the interstellar medium are crucial for constraining the global physical conditions of galaxies with upcoming LIM observations. In this work we present a general framework for creating multitracer mock sub-millimeter line intensity maps based on physically grounded galaxy formation and sub-mm line emission models. We simulate a mock lightcone of 2 deg$^2$ over a redshift range $0\leq z\leq10$, comprising discrete galaxies and galaxy CII, CO, CI emission. We present simulated line intensity maps for two fiducial surveys with resolution and observational frequency windows representative of COMAP and EXCLAIM. We show that the star formation rate and line emission scaling relations predicted by our simulation significantly differ at low halo masses from widely used empirical relations, which are often calibrated to observations of luminous galaxies at lower redshifts. We show that these differences lead to significant changes in key summary statistics used in intensity mapping, such as the one point intensity probability density function and the power spectrum. It will be critical to use more realistic and complex models to forecast the ability of future line intensity mapping surveys to measure observables such as the cosmic star formation rate density.
description: 19 pages, 11 figures
Hoffnung für die Gemeinschaft von Männern und Frauen in der Kirche
Creators: name: Scharffenorth, Gerta
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 29 Nr. 1 (1980): Ökumenische Rundschau, Band 29, Heft 1
Higher Charges in Dynamical Spin Chains for SYM Theory
Creators: name: Agarwal, Abhishek
name: Ferretti, Gabriele
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct, to the first two non-trivial orders, the next conserved charge in the su(2|3) sector of N=4 Super Yang-Mills theory. This represents a test of integrability in a sector where the interactions change the number of sites of the chain. The expression for the charge is completely determined by the algebra and can be written in a diagrammatic form in terms of the interactions already present in the Hamiltonian. It appears likely that this diagrammatic expression remains valid in the full theory and can be generalized to higher loops and higher charges thus helping in establishing complete integrability for these dynamical chains.
description: 14 pages; V2: Appendix added with diagrammatic expression for H_{3,2}
Characterization of protein kinases in platelets
Creators: name: Samiei, Mitra
Publisher: name: University of British Columbia
Year: 2009

description: Numerous studies of cell division control have demonstrated the importance of cell cycleregulated protein kinase networks that are modulated by altering phosphorylation state. To determine whether such kinase networks only function in cell cycle regulation or also function in terminally differentiated cells, studies were undertaken to identify and characterize protein kinases of blood platelets and to monitor kinase activation in platelets activated by phorbol myristate acetate (PMA), platelet activation factor (PAF) or thrombin. Protein kinase C (PKC) was reported to lose calcium- and phospholipid-dependence as a result of proteolysis. The activation state of platelet PKC was studied by anion exchange chromatography of the extracts of PMA-treated platelets. Length of PMA exposure correlated with the disappearance of peak I and II PKC forms and the appearance of new PKC species (peaks III and IV) with lower calcium and lipid dependence in histone HI phosphorylation assays. Alkaline phosphatase treatment of peak IV/V PKC forms led to the appearance of the peak I and III forms, implicating protein phosphorylation in the interconversion of PKC forms. A 32 kDa, cdc-2-like protein kinase in platelet cytosol extracts was identified by its affinity for p13[sub suc1] and its immunoreactivity with anti-PSTAIRE antibody; it associated with cyclin A. PAF or thrombin augmented the kinase activity of the p34[sub cdc2]-cyclin A complex. The stimulation of p34[sup cdc2] was near maximal within one minute exposure to either agonist. Column chromatography and immunoblotting studies revealed both p42[sup erk2] and p44[sup erk1] -like MAP kinases, but only p42eHc2 underwent tyrosyl phosphorylation. The S6 kinases p90[sup rsk] and p70[sup sk6] were found in fractions containing elevated S6 phosphotransferase activity. PMA-activation of MBP and S6 kinases occurred through a PKC-dependent pathway of MAP kinase activation. However, activation by PAF utilized both PKC-dependent and independent pathways. Further upstream, MAP kinase kinase (MEK1) was stimulated by PMA, or thrombin. Subsequently, Rafl, an upstream component of MEK1 signalling, was identified. Using immunoprecipitation and affinity chromotography, interaction and complex formation was detected among Rafl, MEK1, ERK1 and ERK2. These data were the first to demonstrate a complex MAP kinase-dependent signalling network in platelets. These findings provide evidence to support the hypothesis that a protein kinase cascade that has been strongly linked to the control of cell cycle progression in somatic cells has become adapted for alternative functions in terminally differentiated cells.
Coalition Governments in a Model of Parliamentary Democracy
Creators: name: Bandyopadhyay, Siddhartha
name: Oak, Mandar
name: Bandyopadhyay, Siddhartha
name: Oak, Mandar
Publisher: name: Unknown
Year: 2006
Subjects: Political Economy

description: We analyze the relative importance of party ideology and rents from office in the formation of coalitions in a parliamentary democracy. In equilibrium, the types of coalitions that are formed may be minimal winning, minority or surplus and they may be ideologically `disconnected'. The coalitions that form depend upon the relative importance of rents of office and seat shares of the parties. If rents are high, governments cannot be surplus. With low rents or the formateur close to the median, minority governments occur for a wider ideological dispersion. Further, there is a non-monotonic relationship between connectedness of coalitions and rents.
Understanding low energy reaction with exotic nuclei
Creators: name: Nunes, F. M.
name: Summers, N. C.
name: Moro, A. M.
name: Mukhamedzhanov, A. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recent developments on the understanding of low energy reactions are highlighted. Emphasis is given to the CDCC framework where the breakup channels of the projectile are included explicitly. Properties of the breakup couplings are presented. Comments are given with regard to the separation between the nuclear and the Coulomb contributions to breakup cross sections as well as the dependence on the optical potentials. A discussion on the sensitivity of the CDCC basis is discussed, by comparing pure breakup results with transfer to the continuum calculations. Finally, some remaining controversies show the need to go beyond the single particle picture for the projectile.
description: Proceedings from 'Nuclei at the limits', ANL 26-30 July 2004, 6 pages and 8 figures
A Solution to Matching with Preferences over Colleagues
Creators: name: Echenique, Federico
name: Yenmez, Mehmet B.
name: Echenique, Federico
name: Yenmez, Mehmet B.
Publisher: name: Unknown
Year: 2005
Subjects: Institutional and Behavioral Economics

description: We study many-to-one matchings, such as the assignment of students to colleges, where the students have preferences over the other students who would attend the same college. It is well known that the core of this model may be empty, without strong assumptions on agents' preferences. We introduce a method that finds all core matchings, if any exist. The method requires no assumptions on preferences. Our method also finds certain partial solutions that may be useful when the core is empty.
Exploring the hydrostatic mass bias in MUSIC clusters: application to the NIKA2 mock sample
Creators: name: Gianfagna, Giulia
name: De Petris, Marco
name: Yepes, Gustavo
name: De Luca, Federico
name: Sembolini, Federico
name: Cui, Weiguang
name: Biffi, Veronica
name: Kéruzoré, Florian
name: Macías-Pérez, Juan
name: Mayet, Frédéric
name: Perotto, Laurence
name: Rasia, Elena
name: Ruppin, Florian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Clusters of galaxies are useful tools to constrain cosmological parameters, only if their masses can be correctly inferred from observations. In particular, X-ray and Sunyaev-Zeldovich (SZ) effect observations can be used to derive masses within the framework of the hydrostatic equilibrium. Therefore, it is crucial to have a good control of the possible mass biases that can be introduced when this hypothesis is not valid. In this work, we analyzed a set of 260 synthetic clusters from the MUSIC simulation project, at redshifts $0 \leq z \leq 0.82$. We estimate the hydrostatic mass of the MUSIC clusters from X-ray only (temperature and density) and from X-ray and SZ (density and pressure). Then, we compare them with the true 3D dynamical mass. The biases are of the order of 20%. We find that using the temperature instead of the pressure leads to a smaller bias, although the two values are compatible within 1$σ$. Non-thermal contributions to the total pressure support, arising from bulk motion and turbulence of the gas, are also computed and show that they are sufficient to account for this bias. We also present a study of the correlation between the mass bias and the dynamical state of the clusters. A clear correlation is shown between the relaxation state of the clusters and the bias factor. We applied the same analysis on a subsample of 32 objects, already selected for supporting the NIKA2 SZ Large Program.
description: 19 pages, 16 figures. Accepted for publication in MNRAS
Triangular ratio metric in the unit disk
Creators: name: Rainio, Oona
name: Vuorinen, Matti
Publisher: name: arXiv
Year: 2020
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 51M10 (Primary) 30C65 (Secondary)

description: The triangular ratio metric is studied in a domain $G\subsetneq\mathbb{R}^n$, $n\geq2$. Several sharp bounds are proven for this metric, especially, in the case where the domain is the unit disk of the complex plane. The results are applied to study the Hölder continuity of quasiconformal mappings.
description: 26 pages, 4 figures
Non-Destructive Probing of Rabi Oscillations on the Cesium Clock Transition near the Standard Quantum Limit
Creators: name: Windpassinger, P. J.
name: Oblak, D.
name: Petrov, P. G.
name: Kubasik, M.
name: Saffman, M.
name: Alzar, C. L. Garrido
name: Appel, J.
name: Mueller, J. H.
name: Kjaergaard, N.
name: Polzik, E. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on non-destructive observation of Rabi oscillations on the Cs clock transition. The internal atomic state evolution of a dipole-trapped ensemble of cold atoms is inferred from the phase shift of a probe laser beam as measured using a Mach-Zehnder interferometer. We describe a single color as well as a two-color probing scheme. Using the latter, measurements of the collective pseudo-spin projection of atoms in a superposition of the clock states are performed and the observed spin fluctuations are shown to be close to the standard quantum limit.
description: 4 pages, 4 figures, accepted for publication in Physical Review Letters
Cauchy Evolution of Asymptotically Global AdS Spacetimes with No Symmetries
Creators: name: Bantilan, Hans
name: Figueras, Pau
name: Rossi, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the first proof-of-principle Cauchy evolutions of asymptotically global AdS spacetimes with no imposed symmetries, employing a numerical scheme based on the generalized harmonic form of the Einstein equations. In this scheme, the main difficulty in removing all symmetry assumptions can be phrased in terms of finding a set of generalized harmonic source functions that are consistent with AdS boundary conditions. In four spacetime dimensions, we detail an explicit set of source functions that achieves evolution in full generality. A similar prescription should also lead to stable evolution in higher spacetime dimensions, various couplings with matter fields, and on the Poincare patch. We apply this scheme to obtain the first long-time stable 3+1 simulations of four dimensional spacetimes with a negative cosmological constant, using initial data sourced by a massless scalar field. We present preliminary results of gravitational collapse with no symmetry assumptions, and the subsequent quasi-normal mode ringdown to a static black hole in the bulk, which corresponds to evolution towards a homogeneous state on the boundary.
description: Changes to match published version
Backgrounds in Neutrino Appearance Signal at MiniBooNE
Creators: name: Djurcic, Zelimir
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The MiniBooNE (Booster Neutrino Experiment) experiment is a precise search for neutrino oscillations but is crucially sensitive to background processes that would mimic an oscillation signal. The background sources include intrinsic $ν_{e}$ from kaon and muon decays, mis-identified $π^{0}$, gammas from radiative delta decays, and muon neutrino events mis-identified as electrons. A summary of these backgrounds and the tools to handle them is presented.
description: To appear in Proceedings of PANIC 2005 Conference, October 2005, Santa Fe, New Mexico. 4 pages 3 figures