cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hybridized Methods for Quantum Simulation in the Interaction Picture
Creators: name: Rajput, Abhishek
name: Roggero, Alessandro
name: Wiebe, Nathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Conventional methods of quantum simulation involve trade-offs that limit their applicability to specific contexts where their use is optimal. In particular, the interaction picture simulation has been found to provide substantial asymptotic advantages for some Hamiltonians, but incurs prohibitive constant factors and is incompatible with methods like qubitization. We provide a framework that allows different simulation methods to be hybridized and thereby improve performance for interaction picture simulations over known algorithms. These approaches show asymptotic improvements over the individual methods that comprise them and further make interaction picture simulation methods practical in the near term. Physical applications of these hybridized methods yield a gate complexity scaling as $\log^2 Λ$ in the electric cutoff $Λ$ for the Schwinger Model and independent of the electron density for collective neutrino oscillations, outperforming the scaling for all current algorithms with these parameters. For the general problem of Hamiltonian simulation subject to dynamical constraints, these methods yield a query complexity independent of the penalty parameter $λ$ used to impose an energy cost on time-evolution into an unphysical subspace.
Ovine tissues as a source of relaxin-like activity
Creators: name: Lai, Oi Fah.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
REDISTRIBUTION OF COSTS IN A WORLD IN TRANSITION: The evolution of consortial cost-sharing models in transformative agreements in Austria
Creators: name: Pinhasi, Rita
name: Kromp, Brigitte
Publisher: name: Zenodo
Year: 2023
Subjects: Parallel Session 1 – Open Access Management: cross-border cases
open access
transformative agreements
cost-sharing models

description: Abstract Austria, a pioneer in the field, signed its first transformative Open Access (OA) agreement with the Institute of Physics back in 2014. The last near-decade saw a succession of contracts with all major, medium-sized and some society publishers against the backdrop of an explosion of similar agreements in recent years across the world, partly fuelled by the launch of Plan S in September 2018. These agreements profoundly changed the OA landscape in Austria: it is estimated that around 80% of the Austrian Academic Library Consortium’s institutions’ research output is OA at the point of publication, benefitting the academic community and the wider society alike. The transformation also expanded the role of academic libraries in scholarly communication through advocacy, negotiating publishing contracts, implementing efficient OA workflows and liaising with publishers on behalf of researchers. Alas, there are hardly any conversations around OA without the mention of costs. This is true for the Austrian academic library community as well, although, by and large, the subscription-only consortium contracts were successfully converted to OA deals in a cost-neutral manner. The consortium’s OA output could be maximised by pulling the resources together across the sector. However, the new business models introduced a level of disruption to the pre-transition status quo as the original distribution of costs, based predominantly on institutional legacy spend, did not match the emerging institutional-level output and potential associated costs. This in turn prompted some questions: what does a fair and sustainable costsharing model look like in a world where the costs for reading and publishing continue to exist side-by-side? What parameters do we need to consider? Which methodology should we use? In order to answer these questions and to address the apparent imbalance in institutional spending, the consortium decided to take action early on. This presentation will provide an overview of the evolution of the various cost-sharing models introduced for transformative agreements in Austria, from the very first model implemented in 2019 to the outcome of the most recent review concluded in December 2022. It will present data and considerations underpinning the models selected and the challenges the consortium has faced.
Cosmology with gamma-ray bursts: II Cosmography challenges and cosmological scenarios for the accelerated Universe
Creators: name: Demianski, Marek
name: Piedipalumbo, Ester
name: Sawant, Disha
name: Amati, Lorenzo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Context. Explaining the accelerated expansion of the Universe is one of the fundamental challenges in physics today. Cosmography provides information about the evolution of the universe derived from measured distances, assuming only that the space time ge- ometry is described by the Friedman-Lemaitre-Robertson-Walker metric, and adopting an approach that effectively uses only Taylor expansions of basic observables. Aims. We perform a high-redshift analysis to constrain the cosmographic expansion up to the fifth order. It is based on the Union2 type Ia supernovae data set, the gamma-ray burst Hubble diagram, a data set of 28 independent measurements of the Hubble param- eter, baryon acoustic oscillations measurements from galaxy clustering and the Lyman-α forest in the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS), and some Gaussian priors on h and ΩM . Methods. We performed a statistical analysis and explored the probability distributions of the cosmographic parameters. By building up their regions of confidence, we maximized our likelihood function using the Markov chain Monte Carlo method. Results. Our high-redshift analysis confirms that the expansion of the Universe currently accelerates; the estimation of the jerk parameter indicates a possible deviation from the standard ΛCDM cosmological model. Moreover, we investigate implications of our results for the reconstruction of the dark energy equation of state (EOS) by comparing the standard technique of cosmography with an alternative approach based on generalized Padé approximations of the same observables. Because these expansions converge better, is possible to improve the constraints on the cosmographic parameters and also on the dark matter EOS. Conclusions. The estimation of the jerk and the DE parameters indicates at 1σ a possible deviation from the ΛCDM cosmological model.
description: 10 pages, 7 figures, accepted for publication in A & A
The Role of Spin-Flip Collisions in a Dark Exciton Condensate
Creators: name: Misra, Subhradeep
name: Stern, Michael
name: Umansky, Vladimir
name: Joseph, Israel Bar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that a Bose-Einstein condensate consisting of dark excitons forms in GaAs coupled quantum wells at low temperatures. We find that the condensate extends over hundreds of micrometers, well beyond the optical excitation region, and is limited only by the boundaries of the mesa. We show that the condensate density is determined by spin flipping collisions among the excitons, which convert dark excitons into bright ones. The suppression of this process at low temperature yields a density buildup, manifested as a temperature-dependent blueshift of the exciton emission line. Measurements under in-plane magnetic field allows us to preferentially modify the bright excitons density, and determine their role in the system dynamics. We find that their interaction with the condensate leads to its depletion. We present a simple rate equations model, which well-reproduces the observed temperature, power, and magnetic field dependence of the exciton density.
Quantum critical behavior of the superfluid-Mott glass transition
Creators: name: Vojta, Thomas
name: Crewse, Jack
name: Puschmann, Martin
name: Arovas, Daniel
name: Kiselev, Yury
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the zero-temperature superfluid to insulator transitions in a diluted two-dimensional quantum rotor model with particle-hole symmetry. We map the Hamiltonian onto a classical $(2+1)$-dimensional XY model with columnar disorder which we analyze by means of large-scale Monte Carlo simulations. For dilutions below the lattice percolation threshold, the system undergoes a generic superfluid-Mott glass transition. In contrast to other quantum phase transitions in disordered systems, its critical behavior is of conventional power-law type with universal (dilution-independent) critical exponents $z=1.52(3)$, $ν=1.16(5)$, $β/ν= 0.48(2)$, $γ/ν=2.52(4)$, and $η=-0.52(4)$. These values agree with and improve upon earlier Monte-Carlo results [Phys. Rev. Lett. 92, 015703 (2004)] while (partially) excluding other findings in the literature. As a further test of universality, we also consider a soft-spin version of the classical Hamiltonian. In addition, we study the percolation quantum phase transition across the lattice percolation threshold; its critical behavior is governed by the lattice percolation exponents in agreement with recent theoretical predictions. We relate our results to a general classification of phase transitions in disordered systems, and we briefly discuss experiments.
description: 10 pages, 12 figures, final version as published
FORGE -- the f(R) gravity cosmic emulator project I: Introduction and matter power spectrum emulator
Creators: name: Arnold, Christian
name: Li, Baojiu
name: Giblin, Benjamin
name: Harnois-Déraps, Joachim
name: Cai, Yan-Chuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a large suite of cosmological simulations, the FORGE (F-of-R Gravity Emulator) simulation suite, which is designed to build accurate emulators for cosmological observables in galaxy clustering, weak gravitational lensing and galaxy clusters, for the $f(R)$ gravity model. The total of 200 simulations explore the cosmological parameter space around the Planck(2018) cosmology with a Latin hypercube, for 50 combinations of $\bar{f}_{R0}$, $Ω_m$, $σ_8$ and $h$ with all other parameters fixed. For each parameter combination, or node, we ran four independent simulations, one pair using $1024^3$ particles in $500 h^{-1} Mpc$ simulation boxes to cover small scales, and another pair using $512^3$ simulation particles in $1500 h^{-1} Mpc$ boxes for larger scales. Each pair of initial conditions are selected such that sample variance on large scales is minimised on average. In this work we present an accurate emulator for the matter power spectrum in $f(R)$ gravity trained on FORGE. We have verified, using the cross-validation technique, that the emulator accuracy is better than $2.5\%$ for the majority of nodes, particularly around the center of the explored parameter space, up to scales of $k = 10 h Mpc^{-1}$. We have also checked the power spectrum emulator against simulations which are not part of our training set and found excellent agreement. Due to its high accuracy on small scales, the FORGE matter power spectrum emulator is well suited for weak lensing analysis and can play a key tool in constraining $f(R)$ gravity using current and future observational data.
description: 15 pages, FORGE emulator code publicly available from https://bitbucket.org/arnoldcn/forge_emulator/
DNA enzymes of neisseria gonorrhoeae
Creators: name: Duff, Marian Kathleen.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Quantum transport in graphene Hall bars: Effects of vacancy disorder
Creators: name: Petrović, M. D.
name: Peeters, F. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using the tight-binding model, we investigate the influence of vacancy disorder on electrical transport in graphene Hall bars in the presence of quantizing magnetic fields. Disorder, induced by a random distribution of monovacancies, breaks the graphene sublattice symmetry and creates states localized on the vacancies. These states are observable in the bend resistance, as well as in the total DOS. Their energy is proportional to the square root of the magnetic field, while their localization length is proportional to the cyclotron radius. At the energies of these localized states, the electron current flows around the monovacancies and, as we show, it can follow unexpected paths depending on the particular arrangement of vacancies. We study how these localized states change with the vacancy concentration, and what are the effects of including the next nearest neighbor hopping term. Our results are also compared with the situation when double vacancies are present in the system. Double vacancies also induce localized states, but their energy and magnetic field dependences are different. Their localization energy scales linearly with the magnetic field, and their localization length appears not to depend on the field strength.
description: 12 pages, 13 figures. To be published in Phys. Rev. B
Realizing Quantum Convolutional Neural Networks on a Superconducting Quantum Processor to Recognize Quantum Phases
Creators: name: Herrmann, Johannes
name: Llima, Sergi Masot
name: Remm, Ants
name: Zapletal, Petr
name: McMahon, Nathan A.
name: Scarato, Colin
name: Swiadek, Francois
name: Andersen, Christian Kraglund
name: Hellings, Christoph
name: Krinner, Sebastian
name: Lacroix, Nathan
name: Lazar, Stefania
name: Kerschbaum, Michael
name: Zanuz, Dante Colao
name: Norris, Graham J.
name: Hartmann, Michael J.
name: Wallraff, Andreas
name: Eichler, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computing crucially relies on the ability to efficiently characterize the quantum states output by quantum hardware. Conventional methods which probe these states through direct measurements and classically computed correlations become computationally expensive when increasing the system size. Quantum neural networks tailored to recognize specific features of quantum states by combining unitary operations, measurements and feedforward promise to require fewer measurements and to tolerate errors. Here, we realize a quantum convolutional neural network (QCNN) on a 7-qubit superconducting quantum processor to identify symmetry-protected topological (SPT) phases of a spin model characterized by a non-zero string order parameter. We benchmark the performance of the QCNN based on approximate ground states of a family of cluster-Ising Hamiltonians which we prepare using a hardware-efficient, low-depth state preparation circuit. We find that, despite being composed of finite-fidelity gates itself, the QCNN recognizes the topological phase with higher fidelity than direct measurements of the string order parameter for the prepared states.
An impurity in a heteronuclear two-component Bose mixture
Creators: name: Bighin, Giacomo
name: Burchianti, Alessia
name: Minardi, Francesco
name: Macrì, Tommaso
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the fate of an impurity in an ultracold heteronuclear Bose mixture, focusing on the experimentally relevant case of a $^{41}$K-$^{87}$Rb mixture, with the impurity in a $^{41}$K hyperfine state. Our work provides a comprehensive description of an impurity in a BEC mixture with contact interactions across its phase diagram. We present results for the miscible and immiscible regimes, as well as for the impurity in a self-bound quantum droplet. Here, varying the interactions, we find novel, exotic states where the impurity localizes either at the center or at the surface of the droplet.
description: 5 pages and 4 figures, 5 pages and 2 figures (Supplemental material). Updated references
Assessments of epistemic uncertainty using Gaussian stochastic weight averaging for fluid-flow regression
Creators: name: Morimoto, Masaki
name: Fukami, Kai
name: Maulik, Romit
name: Vinuesa, Ricardo
name: Fukagata, Koji
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Machine Learning (cs.LG)
subject: Computational Physics (physics.comp-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We use Gaussian stochastic weight averaging (SWAG) to assess the model-form uncertainty associated with neural-network-based function approximation relevant to fluid flows. SWAG approximates a posterior Gaussian distribution of each weight, given training data, and a constant learning rate. Having access to this distribution, it is able to create multiple models with various combinations of sampled weights, which can be used to obtain ensemble predictions. The average of such an ensemble can be regarded as the `mean estimation', whereas its standard deviation can be used to construct `confidence intervals', which enable us to perform uncertainty quantification (UQ) with regard to the training process of neural networks. We utilize representative neural-network-based function approximation tasks for the following cases: (i) a two-dimensional circular-cylinder wake; (ii) the DayMET dataset (maximum daily temperature in North America); (iii) a three-dimensional square-cylinder wake; and (iv) urban flow, to assess the generalizability of the present idea for a wide range of complex datasets. SWAG-based UQ can be applied regardless of the network architecture, and therefore, we demonstrate the applicability of the method for two types of neural networks: (i) global field reconstruction from sparse sensors by combining convolutional neural network (CNN) and multi-layer perceptron (MLP); and (ii) far-field state estimation from sectional data with two-dimensional CNN. We find that SWAG can obtain physically-interpretable confidence-interval estimates from the perspective of model-form uncertainty. This capability supports its use for a wide range of problems in science and engineering.
Aspects of the biology of the brown goshawk accipiter fasciatus fasciatus in South-eastern Australia
Creators: name: Aumann, Tom.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Physical Basis of Large Microtubule Aster Growth
Creators: name: Ishihara, Keisuke
name: Korolev, Kirill S.
name: Mitchison, Timothy J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Microtubule asters - radial arrays of microtubules organized by centrosomes - play a fundamental role in the spatial coordination of animal cells. The standard model of aster growth assumes a fixed number of microtubules originating from the centrosomes. However, aster morphology in this model does not scale with cell size, and we recently found evidence for non-centrosomal microtubule nucleation. Here, we combine autocatalytic nucleation and polymerization dynamics to develop a biophysical model of aster growth. Our model predicts that asters expand as traveling waves and recapitulates all major aspects of aster growth. As the nucleation rate increases, the model predicts an explosive transition from stationary to growing asters with a discontinuous jump of the growth velocity to a nonzero value. Experiments in frog egg extract confirm the main theoretical predictions. Our results suggest that asters observed in large frog and amphibian eggs are a meshwork of short, unstable microtubules maintained by autocatalytic nucleation and provide a paradigm for the assembly of robust and evolvable polymer networks.
description: 5 figures, supplementary information with 5 additional figures
Aspects of perturbative unitarity
Creators: name: Anselmi, Damiano
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We reconsider perturbative unitarity in quantum field theory and upgrade several arguments and results. The minimum assumptions that lead to the largest time equation, the cutting equations and the unitarity equation are identified. Using this knowledge and a special gauge, we give a new, simpler proof of perturbative unitarity in gauge theories and generalize it to quantum gravity, in four and higher dimensions. The special gauge interpolates between the Feynman gauge and the Coulomb gauge without double poles. When the Coulomb limit is approached, the unphysical particles drop out of the cuts and the cutting equations are consistently projected onto the physical subspace. The proof does not extend to nonlocal quantum field theories of gauge fields and gravity, whose unitarity remains uncertain.
description: 37 pages, 9 figures; v2: minor changes, Phys. Rev. D
Central configurations on the plane with $N$ heavy and $k$ light bodies
Creators: name: Moczurad, Małgorzata
name: Zgliczyński, Piotr
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the problem of planar central configurations with $N$ heavy bodies and $k$ bodies with arbitrary small masses. We derive the equation which describe the limit of light masses going to zero, which can be seen as the equation for central configurations in the anisotropic plane. Using computer rigorous computations we compute all central configurations for $N=2$ and $k=3,4$ and for the derived limit problem. We show that the results are consistent.
description: 42 pages, 18 figures
Fetal sheep brain development under altered thyroid conditions
Creators: name: Hua, Cha-hong.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Causality and Responsibility for Formal Verification and Beyond
Creators: name: Chockler, Hana
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The theory of actual causality, defined by Halpern and Pearl, and its quantitative measure - the degree of responsibility - was shown to be extremely useful in various areas of computer science due to a good match between the results it produces and our intuition. In this paper, I describe the applications of causality to formal verification, namely, explanation of counterexamples, refinement of coverage metrics, and symbolic trajectory evaluation. I also briefly discuss recent applications of causality to legal reasoning.
description: In Proceedings CREST 2016, arXiv:1608.07398. Invited paper
Stormwater drainage and wastewater disposal in the Dandenong Ranges : some effects of soil absorption pits on peak stormwater run off from small catchments
Creators: name: Thompson, Don E.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Audibility of recreational vehicles in some Victorian forests
Creators: name: Martin, Brian V. .
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Design of Conformal Array of Rectangular Waveguide-fed Metasurfaces
Creators: name: Yoo, Insang
name: Smith, David R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Signal Processing (eess.SP)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We present a systematic design method for a cylindrical conformal array of rectangular waveguide-fed metasurfaces. The conformal metasurface consists of multiple curved rectangular waveguides loaded with metamaterial elements\textemdash electrically small irises\textemdash inserted into the upper conducting walls of the waveguides. Each element radiates energy into free space to contribute to an overall radiation pattern. Thus, the geometry or electrical configuration of each of the individual metamaterial elements needs to be tailored to generate a desired pattern. In general, due to difficulties in modeling the effect of curvature, the design of conformal metasurface arrays has relied on full-wave simulations or experiments. In this study, we propose a design method utilizing the analytic model of a planar metasurface accounting for metamaterial elements' locations and orientations over a surface with curvature. Although approximate, we demonstrate that such an alteration along with the framework of dipolar modeling of planar elements can be used for the analysis of conformal arrays with small curvature. We then design a conformal array metasurface using the method combined with CMA-ES optimizer. Through numerical simulations, we confirm the validity of the proposed design method. Applications include the design of metasurfaces for radar, communications, and imaging systems for automobiles and airplanes.
The coagulopathy of chronic liver disease and its alteration by interventional therapies of rhodiascit ascites reinfusion and endoscopic variceal sclerotherapy
Creators: name: Tang, Howard Ho-Wai.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Effective dissipation: breaking time-reversal symmetry in driven microscopic energy transmission
Creators: name: Brown, Aidan I.
name: Sivak, David A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: At molecular scales, fluctuations play a significant role and prevent biomolecular processes from always proceeding in a preferred direction, raising the question of how limited amounts of free energy can be dissipated to obtain directed progress. We examine the system and process characteristics that efficiently break time-reversal symmetry at fixed energy loss; in particular for a simple model of a molecular machine, an intermediate energy barrier produces unusually high asymmetry for a given dissipation. We relate the symmetry-breaking factors found in this model to recent observations of biomolecular machines.
description: 9 pages, 3 figures
title: hormos (ὅρμος, ὁ)
Creators: name: Magnetto, Anna
Publisher: name: Laboratorio di Storia, Archeologia, Epigrafia e Tradizione dell'antico (SAET) - Scuola Normale Superiore
Year: 2023
Subjects: subject: FOS: Humanities
valueUri: http://www.oecd.org/science/inno/38235147.pdf

description: Analisi della voce hormos (ὅρμος, ὁ).
High-resolution modeling of nonlinear Compton scattering in focused laser pulses
Creators: name: Nielsen, Christian F.
name: Holtzapple, Robert
name: King, Ben
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A semi-classical approach is used to calculate radiation emission in the collision of an electron with an intense focused laser pulse. The results are compared to predictions from the locally constant field and locally monochromatic approximations. It is found that simulations employing the semi-classical approach capture features in the energy spectra, such as subharmonics and bandwidth structure, which are beyond local approaches. The formation length is introduced as a diagnostic to select between approaches as the electron is propagated through the pulse.
description: 10 Pages, 5 figures
Through a Black Hole Singularity
Creators: name: Mercati, Flavio
name: Sloan, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the Kantowski--Sachs model of a Schwarzschild black hole interior can be slightly generalized in order to accommodate spatial metrics of different orientations, and in this formulation the equations of motion admit a variable redefinition that makes the system regular at the singularity. This system will then traverse the singularity in a deterministic way (information will be conserved through it), and evolve into a time-reversed and orientation-flipped Schwarzschild white hole interior.
description: 8 pages, 5 figures
Quantifying nonlocality: how outperforming local quantum codes is expensive
Creators: name: Baspin, Nouédyn
name: Krishna, Anirudh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum low-density parity-check (LDPC) codes are a promising avenue to reduce the cost of constructing scalable quantum circuits. However, it is unclear how to implement these codes in practice. Seminal results of Bravyi & Terhal, and Bravyi, Poulin & Terhal have shown that quantum LDPC codes implemented through local interactions obey restrictions on their dimension $k$ and distance $d$. Here we address the complementary question of how many long-range interactions are required to implement a quantum LDPC code with parameters $k$ and $d$. In particular, in 2D we show that a quantum LDPC with distance $n^{1/2 + ε}$ code requires $Ω(n^{1/2 + ε})$ interactions of length $\widetildeΩ(n^ε)$. Further a code satisfying $k \propto n$ with distance $d \propto n^α$ requires $\widetildeΩ(n)$ interactions of length $\widetildeΩ(n^{α/2})$. Our results are derived using bounds on quantum codes from graph metrics. As an application of these results, we consider a model called a stacked architecture, which has previously been considered as a potential way to implement quantum LDPC codes. In this model, although most interactions are local, a few of them are allowed to be very long. We prove that limited long-range connectivity implies quantitative bounds on the distance and code dimension.
Miniaturized lab system for future cold atom experiments in microgravity
Creators: name: Kulas, Sascha
name: Vogt, Christian
name: Resch, Andreas
name: Hartwig, Jonas
name: Ganske, Sven
name: Matthias, Jonas
name: Schlippert, Dennis
name: Wendrich, Thijs
name: Ertmer, Wolfgang
name: Rasel, Ernst Maria
name: Damjanic, Marcin
name: Weßels, Peter
name: Kohfeldt, Anja
name: Luvsandamdin, Erdenetsetseg
name: Schiemangk, Max
name: Grzeschik, Christoph
name: Krutzik, Markus
name: Wicht, Andreas
name: Peters, Achim
name: Herrmann, Sven
name: Lämmerzahl, Claus
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the technical realization of a compact system for performing experiments with cold $^{87}{\text{Rb}}$ and $^{39}{\text{K}}$ atoms in microgravity in the future. The whole system fits into a capsule to be used in the drop tower Bremen. One of the advantages of a microgravity environment is long time evolution of atomic clouds which yields higher sensitivities in atom interferometer measurements. We give a full description of the system containing an experimental chamber with ultra-high vacuum conditions, miniaturized laser systems, a high-power thulium-doped fiber laser, the electronics and the power management. In a two-stage magneto-optical trap atoms should be cooled to the low $μ$K regime. The thulium-doped fiber laser will create an optical dipole trap which will allow further cooling to sub-$μ$K temperatures. The presented system fulfills the demanding requirements on size and power management for cold atom experiments on a microgravity platform, especially with respect to the use of an optical dipole trap. A first test in microgravity, including the creation of a cold Rb ensemble, shows the functionality of the system.
Prospects of SETI by small size optical telescopes
Creators: name: Osmanov, Z. N.
name: Berezhiani, V. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: In the present manuscript we consider the possibility of SETI by the small size (with diameters less than 1 m) optical telescopes. Calculations are performed for typical parameters of the mentioned type of telescopes. In particular, we show that the techno-signatures of Type-2.x and Type-3.x civilizations might be detected. It is demonstrated that it is possible to detect as hot megastructures (up to 4000 K) built around main sequence stars and pulsars as well as von Neumann extraterrestrial probes.
description: 5 pages, 0 figures
(De-)Composing Causality in Labeled Transition Systems
Creators: name: Caltais, Georgiana
name: Leue, Stefan
name: Mousavi, Mohammad Reza
Publisher: name: arXiv
Year: 2016
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: In this paper we introduce a notion of counterfactual causality in the Halpern and Pearl sense that is compositional with respect to the interleaving of transition systems. The formal framework for reasoning on what caused the violation of a safety property is established in the context of labeled transition systems and Hennessy Milner logic. The compositionality results are devised for non-communicating systems.
description: In Proceedings CREST 2016, arXiv:1608.07398
Microfluorometric studies on the DNA and protein content of the pulvillar polytene nuclei of sarcophaga bullata during pharate adult development
Creators: name: Browne, Colin.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Non-universal Fermi polaron in quasi two-dimensional quantum gases
Creators: name: Shi, Yue-Ran
name: Chen, Jin-Ge
name: Gao, Kuiyi
name: Zhang, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We consider an impurity problem in a quasi-two-dimensional Fermi gas, where a spin-down impurity is immersed in a Fermi sea of N spin-up atoms. Using a variational approach and an effective two-channel model, we obtain the energies of the system for a wide range of interaction strength and for various different mass ratios between the impurity and the back ground fermion in the context of heteronuclear mixture. It is demonstrated that in a quasi-two-dimensional Fermi gas there exists a transition of the ground state from polaron in the weakly interacting region to molecule in the strongly interacting region. The critical interaction strength of the polaron-molecule transition is non-universal and depends on the particle density of the background Fermi sea. We also investigate the properties of the excited repulsive polaron state, and find similar non-universal behavior.
description: 7 pages, 5 figures
Spectroscopy of candidate electromagnetic counterparts to gravitational wave sources
Creators: name: Steele, Iain A
name: Copperwheat, Chris M
name: Piascik, Andrzej S
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A programme of worldwide, multi-wavelength electromagnetic follow-up of sources detected by gravitational wave detectors is in place. Following the discovery of GW150914 and GW151226, wide field imaging of their sky localisations identified a number of candidate optical counterparts which were then spectrally classified. The majority of candidates were found to be supernovae at redshift ranges similar to the GW events and were thereby ruled out as a genuine counterpart. Other candidates ruled out include AGN and solar system objects. Given the GW sources were black hole binary mergers, the lack of an identified electromagnetic counterpart is not surprising. However the observations show that is it is possible to organise and execute a campaign that can eliminate the majority of potential counterparts. Finally we note the existence of a "classification gap" with a significant fraction of candidates going unclassified.
description: 4 pages. Submitted to Proceedings of IAU Symposium 324 (New Frontiers in Black Hole Astrophysics). Minor revision
Renormalization approach to the superconducting Kondo model
Creators: name: Sykora, Steffen
name: Meng, Tobias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: An approach to bound states based on unitary transformations of Hamiltonians is presented. The method is applied to study the interaction between electrons in a BCS $s$-wave superconductor and a quantum spin. It is shown that known results from the t-matrix method and numerical studies are reproduced by this new method. As a main advantage, the method can straightforwardly be extended to study the topological properties of combined bound states in chains of many magnetic impurities. It also provides a uniform picture of the interplay between the Yu-Shiba-Rusinov (YSR) bound states and the Kondo singlet state.
description: 29 pages, 7 figures, Submission to SciPost
Damping in yttrium iron garnet film with an interface
Creators: name: Kumar, Ravinder
name: Samantaray, B.
name: Das, Shubhankar
name: Lal, Kishori
name: Samal, D.
name: Hossain, Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report strong damping enhancement in a 200 nm thick yttrium iron garnet (YIG) film due to spin inhomogeneity at the interface. The growth-induced thin interfacial gadolinium iron garnet (GdIG) layer antiferromagnetically (AFM) exchange couples with the rest of the YIG layer. The out-of-plane angular variation of ferromagnetic resonance (FMR) linewidth $ΔH$ reflects a large inhomogeneous distribution of effective magnetization $Δ4 πM_{eff}$ due to the presence of an exchange springlike moments arrangement in YIG. We probe the spin inhomogeneity at the YIG-GdIG interface by performing an in-plane angular variation of resonance field $H_{r}$, leading to a unidirectional feature. The large extrinsic $Δ4πM_{eff}$ contribution, apart from the inherent intrinsic Gilbert contribution, manifests enhanced precessional damping in YIG film.
description: 6 pages, 3 figures
Clinical pharmacokinetics of the beta adrenoreceptor blocking drugs timolol and oxprenolol in man
Creators: name: Ashley, Peter.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Matter density perturbation and power spectrum in running vacuum model
Creators: name: Geng, Chao-Qiang
name: Lee, Chung-Chi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the matter density perturbation $δ_m$ and power spectrum $P(k)$ in the running vacuum model (RVM) with the cosmological constant being a function of the Hubble parameter, given by $Λ= Λ_0 + 6 σH H_0+ 3νH^2$, in which the linear and quadratic terms of $H$ would originate from the QCD vacuum condensation and cosmological renormalization group, respectively. Taking the dark energy perturbation into consideration, we derive the evolution equation for $δ_m$ and find a specific scale $d_{cr}=2 π/k_{cr}$, which divides the evolution of the universe into the sub and super-interaction regimes, corresponding to $k \ll k_{cr}$ and $k \gg k_{cr}$, respectively. For the former, the evolution of $δ_m$ has the same behavior as that in the $Λ$CDM model, while for the latter, the growth of $δ_m$ is frozen (greatly enhanced) when $ν+ σ>(
description: 7 pages, 6 figures, revised version accepted for publication in MNRAS
Hadron structure from basis light-front quantization
Creators: name: Mondal, Chandan
name: Lan, Jiangshan
name: Fu, Kaiyu
name: Xu, Siqi
name: Hu, Zhi
name: Zhao, Xingbo
name: Vary, James P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present our recent progress in applying basis light-front quantization approach to investigate the structure of the light mesons and the nucleon.
description: 6 pages, 5 figures; minor modifications, figure 5 added; Proceedings for the 50th International Symposium on Multi-particle Dynamics (ISMD2021), Zurich, Europe, 12-16 July 2021
CHESS SETUP... a European project seeking building's energy self sufficiency
Creators: name: Abadal, Jordi
name: Morató, Moisès
Publisher: name: Zenodo
Year: 2016
Subjects: energy self sufficiency
energy saving strategies
technologies for heat supply

description: On November 15th of January, Jordi Abadal from Urban Ecology Agency of Barcelona (BCNecologia) gave an introduction speech about Chess Setup at the Smart City Expo World Congress in Barcelona. The Smart City Expo World Congress is a leading event gathering around 15,000 professionals related to Smart Cities’ definition. He explained the visitors the project’s root: the central question of lowering the energy consumption of the housing sector. From the two options, lowering demand, or raising efficiency, stemmed ideas of energy storage. Jordi detailed the various systems imagined to combine heat demand and supply all year long through combined storage tank and heat pumps. He focused then on the part that could be played by renewable energies, and solar technologies to power the above-mentioned systems, giving examples of seasonal storage pilots. The project is closely related to the framework of the present event as its main objective is to provide a reliable and replicable solution for building's self-sufficiency in the growing smart cities.
Quantum algorithms for anomaly detection using amplitude estimation
Creators: name: Guo, Ming-Chao
name: Liu, Hai-Ling
name: Li, Yong-Mei
name: Li, Wen-Min
name: Qin, Su-Juan
name: Wen, Qiao-Yan
name: Gao, Fei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Anomaly detection plays a critical role in fraud detection, health care, intrusion detection, military surveillance, etc. Anomaly detection algorithm based on density estimation (called ADDE algorithm) is one of widely used algorithms. Liang et al. proposed a quantum version of the ADDE algorithm [Phys. Rev. A 99, 052310 (2019)] and it is believed that the algorithm has exponential speedups on both the number and the dimension of training data point over the classical algorithm. In this paper, we find that Liang et al.'s algorithm doesn't actually execute. Then we propose a new quantum ADDE algorithm based on amplitude estimation. It is shown that our algorithm can achieves exponential speedup on the number $M$ of training data points compared with the classical counterpart. Besides, the idea of our algorithm can be applied to optimize the anomaly detection algorithm based on kernel principal component analysis (called ADKPCA algorithm). Different from the quantum ADKPCA proposed by Liu et al. [Phys. Rev. A 97, 042315 (2018)], compared with the classical counterpart, which offer exponential speedup on the dimension $d$ of data points, our algorithm achieves exponential speedup on $M$.
The impact of fire in foothill eucalypt forest on small mammals and vegetation at Daylesford, Victoria
Creators: name: Heislers, A.
Publisher: name: Monash University
Year: 2022

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
The Renovation Wave put into practice
Creators: name: Nigumann, Eero
Publisher: name: Zenodo
Year: 2023
Subjects: Renovation Wave, Wood, Timber, Construction

description: In Estonia, about 70% of the population lives in apartment buildings built more than 30 years ago. Most of these buildings have the same typical problems: high levels of energy consumption, inadequate ventilation and uneven indoor temperatures. Therefore, the buildings need rather extensive renovation work.
 The Timbeco team, in collaboration with TalTech University and Drive0, has developed a functional apartment building renovation solution. The demo project has been constructed and the data is being analysed to assess the performance of the solution. The presentation provides and overview on the technology and assembly system.