cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
PENELLOPE III. The peculiar accretion variability of XX Cha and its impact on the observed spread of accretion rates
Creators: name: Claes, R. A. B.
name: Manara, C. F.
name: Garcia-Lopez, R.
name: Natta, A.
name: Fang, M.
name: Fockter, Z. P.
name: Ábrahám, P.
name: Alcalá, J. M.
name: Campbell-White, J.
name: Garatti, A. Caratti o
name: Covino, E.
name: Fedele, D.
name: Frasca, A.
name: Gameiro, J. F.
name: Herczeg, G. J.
name: Kóspál, Á.
name: Petr-Gotzens, M. G.
name: Rosotti, G.
name: Venuti, L.
name: Zsidi, G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The processes regulating protoplanetary disk evolution are constrained by studying how mass accretion rates scale with stellar and disk properties. The spread in these relations can be used as a constraint to the models of disk evolution, but only if the impact of accretion variability is correctly accounted for. While the effect of variability might be substantial in the embedded phases of star formation, it is often considered limited at later stages. Here we report on the observed large variation in the accretion rate for one target, XX Cha, and we discuss the impact on population studies of classical T Tauri stars. The mass accretion rate determined by fitting the UV-to-near-infrared spectrum in recent X-Shooter observations is compared with the one measured with the same instrument 11 years before. XX Cha displays an accretion variability of almost 2 dex between 2010 and 2021. Although the timescales on which this variability happens are uncertain, XX Cha displays an extreme accretion variability for a classical T Tauri star. If such behavior is common among classical T Tauri stars, possibly on longer timescales than previously probed, it could be relevant for discussing the disk evolution models constrained by the observed spread in accretion rates. Finally, we remark that previous studies of accretion variability based on spectral lines may have underestimated the variability of some targets.
description: Accepted for publication in A&A letters
An examination of some aspects of buoyant motion
Creators: name: Thomson, David Leslie.
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.
XMM-Newton and NuSTAR Observations of an Optically Quiescent Quasar
Creators: name: Greenwell, Claire
name: Gandhi, Poshak
name: Lansbury, George
name: Boorman, Peter
name: Mainieri, Vincenzo
name: Stern, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Optically quiescent quasars (OQQs) represent a recently systematised class of infrared-luminous active galactic nuclei (AGN) which have galaxy-like optical continua. They may represent an interesting, brief phase in the AGN life cycle, e.g. either cocooned within high-covering-factor media or indicative of recent triggering, though their nature remains unclear. Here, we present the first targeted simultaneous X-ray observations of an OQQ, our previously identified prototype, SDSS J075139.06+402811.2 at $z$=0.587. The source is significantly detected over 0.5-16 keV with XMM-Newton and NuSTAR, unambiguously confirming the presence of current accretion activity. Spectral modelling yields an intrinsic luminosity $L_{\rm 2-10 keV}$ $\approx$4.4$ \times$10$^{43}$ erg s$^{-1}$, well within the AGN regime, but underluminous relative to its infrared power. It is lightly obscured, with log $N_{\rm H}$ [cm$^{-2}$] $\approx$22.
description: 10 pages, 4 figures, 1 table. Accepted for publication in ApJL
Temperature Structures Associated with Different Components of the Atmospheric Circulation on Tidally Locked Exoplanets
Creators: name: Lewis, Neil T.
name: Hammond, Mark
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Observations of time-resolved thermal emission from tidally locked exoplanets can tell us about their atmospheric temperature structure. Telescopes such as JWST and ARIEL will improve the quality and availability of these measurements. This motivates an improved understanding of the processes that determine atmospheric temperature structure, particularly atmospheric circulation. The circulation is important in determining atmospheric temperatures, not only through its ability to transport heat, but also because any circulation pattern needs to be balanced by horizontal pressure contrasts, therefore implying a particular temperature structure. In this work, we show how the global temperature field on a tidally locked planet can be decomposed into contributions that are balanced by different components of the atmospheric circulation. These are the superrotating jet, stationary Rossby waves, and the divergent circulation. To achieve this, we partition the geopotential field into components balanced by the divergent circulation and the rotational circulation, with the latter comprising the jet and Rossby waves. The partitioned geopotential then implies a corresponding partitioning of the temperature via the hydrostatic relation. We apply these diagnostics to idealised general circulation model simulations, to show how the separate rotational and divergent circulations together make up the total three-dimensional atmospheric temperature structure. We also show how each component contributes distinct signatures to the thermal phase curve of a tidally locked planet. We conclude that this decomposition is a physically meaningful separation of the temperature field that explains its global structure, and can be used to fit observations of thermal emission.
description: Submitted to AAS journals. Comments welcome and appreciated
Thermodynamics Quantities for the Klein-Gordon Equation with a Linear plus Inverse-linear Potential: Biconfluent Heun functions
Creators: name: Arda, Altug
name: Tezcan, Cevdet
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study some thermodynamics quantities for the Klein-Gordon equation with a linear plus inverse-linear, scalar potential. We obtain the energy eigenvalues with the help of the quantization rule coming from the biconfluent Heun's equation. We use a method based on the Euler-MacLaurin formula to compute the thermal functions analytically by considering only the contribution of positive part of spectrum to the partition function.
description: to be published in Pramana, 11 pages, 4 figures
title: Verständigung mit Frankreich. Das vergebliche Plädoyer des Oberst Dr. Hans Speidel / Text von Dieter Krüger ; gelesen von: Christoph Jan Longen
Creators: name: Krüger, Dieter
Publisher: name: ZMSBw
Year: 2023

description: Rezension von: Krüger, Dieter Verständigung mit Frankreich : das vergebliche Plädoyer des Oberst Dr. Hans Speidel Paris 1940-1942 / von Dieter Krüger. - Berlin : Carola Hartmann Miles-Verlag, 2021. - 144 Seiten. - Quellen- und Literaturverzeichnis: Seite 128-137. ISBN 978-3-96776-027-9
description: Buchjournal: Angelesen. : das Buchjournal des ZMSBw / Zentrum für Militärgeschichte und Sozialwissenschaften der Bundeswehr; [53]
High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst
Creators: name: Shaw, A. W.
name: Miller, J. M.
name: Grinberg, V.
name: Buisson, D. J. K.
name: Heinke, C. O.
name: Plotkin, R. M.
name: Tomsick, J. A.
name: Bahramian, A.
name: Gandhi, P.
name: Sivakoff, G. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We observed the Galactic black hole X-ray binary V4641 Sgr with the high resolution transmission gratings on Chandra during the source's 2020 outburst. Over two epochs of Chandra gratings observations, we see numerous highly ionized metal lines, superimposed on a hot, disc-dominated X-ray continuum. The measured inner disc temperatures and luminosities imply an unfeasibly small inner disc radius, such that we suggest that the central engine of V4641 Sgr is obscured, and we are viewing scattered X-rays. We find that the emission lines in the Chandra spectra cannot be constrained by a single photoionized model, instead finding that two separate photoionized model components are required, one to reproduce the iron lines and a second for the other metals. We compare the observed X-ray spectra of V4641 Sgr to optical studies during previous outbursts of the source, suggesting that the lines originate in an accretion disc wind, potentially with a spherical geometry.
description: 14 pages, 11 figures, accepted for publication in MNRAS
A TESS search for donor-star pulsations in High-Mass X-ray Binaries
Creators: name: Ramsay, Gavin
name: Hakala, Pasi
name: Charles, Philip A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Ground-based optical photometry of the counterparts of High-Mass X-ray Binaries (HMXBs) has revealed the presence of periodic modulations on timescales of ~0.3-0.5 d. More recent space-based observations Corot and TESS of OB and Be stars have shown that pulsations caused by p and g modes are common in early type stars. We have therefore undertaken a systematic search for variability in the optical counterparts of 23 HMXBs (mostly neutron star systems, but including one black hole, Cyg X-1) using TESS data primarily in 2 min cadence mode. After removing the orbital period modulation in four systems, we find that all 23 sources show evidence for quasi-periodic variability on periods shorter than ~1 d. We compare their power spectra with those from observations of other OB and Be type stars. In two systems, V725 Tau and HD 249179 (which may not be a HMXB), we find evidence for an outburst, the former being simultaneous with an X-ray flare. We search for changes in the power spectra over the outburst duration, and compare them with outbursts seen in other Be systems.
description: Accepted for publication in the main journal of MNRAS
Quantum Phase Transition in the Shape of Zr isotopes
Creators: name: Togashi, Tomoaki
name: Tsunoda, Yusuke
name: Otsuka, Takaharu
name: Shimizu, Noritaka
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The rapid shape change in Zr isotopes near neutron number $N$=60 is identified to be caused by type II shell evolution associated with massive proton excitations to its $0g_{9/2}$ orbit, and is shown to be a quantum phase transition. Monte Carlo shell-model calculations are carried out for Zr isotopes of $N$=50-70 with many configurations spanned by eight proton orbits and eight neutron orbits. Energy levels and B(E2) values are obtained within a single framework in a good agreement with experiments, depicting various shapes in going from $N$=50 to 70. Novel coexistence of prolate and triaxial shapes is suggested.
description: 5 pages, 4 figures
Optical Levitation of Nanodiamonds by Doughnut Beams in Vacuum
Creators: name: Zhou, Lei-Ming
name: Xiao, Ke-Wen
name: Chen, Jun
name: Zhao, Nan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Optically levitated nanodiamonds with nitrogen-vacancy centers promise a high-quality hybrid spin-optomechanical system. However, the trapped nanodiamond absorbs energy form laser beams and causes thermal damage in vacuum. We propose to solve the problem by trapping a composite particle (a nanodiamond core coated with a less absorptive silica shell) at the center of strongly focused doughnut-shaped laser beams. Systematical study on the trapping stability, heat absorption, and oscillation frequency concludes that the azimuthally polarized Gaussian beam and the linearly polarized Laguerre-Gaussian beam ${\rm LG}_{03}$ are the optimal choices. With our proposal, particles with strong absorption coefficients can be trapped without obvious heating and, thus, the spin-optomechanical system based on levitated nanodiamonds are made possible in high vacuum with the present experimental techniques.
description: 8 pages, 8 figures
Performance of optimal linear-response processes in driven Brownian motion far from equilibrium
Creators: name: Kamizaki, Lucas P.
name: Bonança, Marcus V. S.
name: muniz, Sérgio R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Considering the paradigmatic driven Brownian motion, we perform extensive numerical analysis on the performance of optimal linear-response processes far from equilibrium. We focus on the overdamped regime where exact optimal processes are known analytically, and most experiments operate. This allows us to compare the optimal processes obtained in linear response and address their relevance to experiments, using realistic parameter values from experiments with optical tweezers. Our results help assess the accuracy of perturbative methods in calculating the irreversible work for cases where an exact solution does not exist. For that, we present a performance metric comparing the approximate optimal solution to the exact one. Our main result is that optimal linear-response processes can perform surprisingly well, even far from where they were expected.
description: 12 pages, 11 figures; Comments are welcome
The exclusive $J/ψ$ process at the LHC tamed to probe the low $x$ gluon
Creators: name: Jones, S. P.
name: Martin, A. D.
name: Ryskin, M. G.
name: Teubner, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The perturbative QCD expansion for $J/ψ$ photoproduction appears to be unstable: the NLO correction is large (and of opposite sign) to the LO contribution. Moreover, the predictions are very sensitive to the choice of factorization and renormalization scales. Here we show that perturbative stability is greatly improved by imposing a $`Q_0$ cut' on the NLO coefficient functions; a cut which is required to avoid double counting. $Q_0$ is the input scale used in the parton DGLAP evolution. This result opens the possibility of high precision exclusive $J/ψ$ data in the forward direction at the LHC being able to determine the low $x$ gluon distribution at low scales.
description: 14 pages, 5 figures. Final paragraph of Sect. 3.2 added. Version to be published in EPJC
Dynamics and structure of the Ninety Mile Beach, Gippsland
Creators: name: Hargreaves, Ian.
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.
Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis
Creators: name: Ball, Warrick H.
name: Miglio, Andrea
name: Chaplin, William J.
name: Stassun, Keivan G.
name: García, Rafael
name: González-Cuesta, Lucia
name: Mathur, Savita
name: Appourchaux, Thierry
name: Benomar, Othman
name: Buzasi, Derek L.
name: Jiang, Chen
name: Kayhan, Cenk
name: Örtel, Sibel
name: Orhan, Zeynep Çelik
name: Yıldız, Mutlu
name: Ong, J. M. Joel
name: Basu, Sarbani
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Binary stars in which oscillations can be studied in either or both components can provide powerful constraints on our understanding of stellar physics. The bright binary 12 Boötis (12 Boo) is a particularly promising system because the primary is roughly 60 per cent brighter than the secondary despite being only a few per cent more massive. Both stars have substantial surface convection zones and are therefore, presumably, solar-like oscillators. We report here the first detection of solar-like oscillations and ellipsoidal variations in the TESS light curve of 12 Boo. Though the solar-like oscillations are not clear enough to unambiguously measure individual mode frequencies, we combine global asteroseismic parameters and a precise fit to the spectral energy distribution (SED) to provide new constraints on the properties of the system that are several times more precise than values in the literature. The SED fit alone provides new effective temperatures, luminosities and radii of $6115\pm45\,\mathrm{K}$, $7.531\pm0.110\,\mathrm{L}_\odot$ and $2.450\pm0.045\,\mathrm{R}_\odot$ for 12 Boo A and $6200\pm60\,\mathrm{K}$, $4.692\pm0.095\,\mathrm{L}_\odot$ and $1.901\pm0.045\,\mathrm{R}_\odot$ for 12 Boo B. When combined with our asteroseismic constraints on 12 Boo A, we obtain an age of $2.67^{+0.12}_{-0.16}\,\mathrm{Gyr}$, which is consistent with that of 12 Boo B.
description: Accepted for publication in MNRAS. 6 pages, 4 figures
Search for new physics in semileptonic B-decays
Creators: name: Klaver, Suzanne
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Semileptonic decays provide an excellent environment for testing the Standard Model (SM). Violation of lepton universality would be a smoking gun for physics beyond the SM. Using semi-tauonic $B$ decays, LHCb finds a value of $\mathcal{R}(D^*) = \mathcal{B}(\bar{B}^0 \to D^{*+} τ^{-} \barν_τ)/\mathcal{B}(\bar{B}^0 \to D^{*+} μ^{-} \barν_μ) = 0.336 \pm 0.027 \rm{(stat)} \pm 0.030 \rm{(syst)}$, which is 2.1 standard deviations larger than the value expected from the SM. Moreover, the measurement of the $CP$ asymmetry in mixing of $B_s^0$ mesons is highly sensitive to physics beyond the SM. This article presents the latest result on semileptonic asymmetries; using the full Run 1 dataset, it is found that $a_{\rm{sl}}^s = (0.39 \pm 0.26 \rm{(stat)} \pm 0.20 \rm{(syst)})\%$, which is consistent with the Standard Model.
description: 6 pages, 8 figures, Contribution to the Proceedings of the 38th International Conference on High Energy Physics, ICHEP 2016, Chicago, IL, USA
Graviton and gluon scattering from first principles
Creators: name: Boels, Rutger H.
name: Medina, Ricardo
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Graviton and gluon scattering are studied from minimal physical assumptions such as Poincare and gauge symmetry as well as unitarity. The assumptions lead to an interesting and surprisingly restrictive set of linear equations. This shows gluon and graviton scattering to be related in many field and string theories, explaining and extending several known results. By systematic analysis exceptional graviton scattering amplitudes are derived which in general dimensions can not be related to gluon amplitudes. The simplicity of the formalism guarantees wide further applicability to gauge and gravity theories.
description: 6 pages, typos corrected, references updated. Version accepted for publication in PRL
Nambu-Goldstone modes in the random phase approximation
Creators: name: Neergård, Kai
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I show that the kernel of the random phase approximation (RPA) matrix based on a stable Hartree, Hartree-Fock, Hartree-Bogolyubov or Hartree-Fock-Bogolyubov mean field solution is decomposed into a subspace with a basis whose vectors are associated, in the equivalent formalism of a classical Hamiltonian homogeneous of second degree in canonical coordinates, with conjugate momenta of cyclic coordinates (Nambu-Goldstone modes) and a subspace with a basis whose vectors are associated with pairs of a coordinate and its conjugate momentum neither of which enters the Hamiltonian at all. In a subspace complementary to the one spanned by all these coordinates including the conjugate coordinates of the Nambu-Goldstone momenta, the RPA matrix behaves as in the case of a zerodimensional kernel. This result was derived very recently by Nakada as a corollary to a general analysis of RPA matrices based on both stable and unstable mean field solutions. The present proof does not rest on Nakada's general results.
description: A point was clarified
Energetically Consistent Model Reduction for Metriplectic Systems
Creators: name: Gruber, Anthony
name: Gunzburger, Max
name: Ju, Lili
name: Wang, Zhu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The metriplectic formalism is useful for describing complete dynamical systems which conserve energy and produce entropy. This creates challenges for model reduction, as the elimination of high-frequency information will generally not preserve the metriplectic structure which governs long-term stability of the system. Based on proper orthogonal decomposition, a provably convergent metriplectic reduced-order model is formulated which is guaranteed to maintain the algebraic structure necessary for energy conservation and entropy formation. Numerical results on benchmark problems show that the proposed method is remarkably stable, leading to improved accuracy over long time scales at a moderate increase in cost over naive methods.
Cooling of neutron stars with diffusive envelopes
Creators: name: Beznogov, M. V.
name: Fortin, M.
name: Haensel, P.
name: Yakovlev, D. G.
name: Zdunik, J. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the effects of heat blanketing envelopes of neutron stars on their cooling. To this aim, we perform cooling simulations using newly constructed models of the envelopes composed of binary ion mixtures (H--He, He--C, C--Fe) varying the mass of lighter ions (H, He or C) in the envelope. The results are compared with those calculated using the standard models of the envelopes which contain the layers of lighter (accreted) elements (H, He and C) on top of the Fe layer, varying the mass of accreted elements. The main effect is that the chemical composition of the envelopes influences their thermal conductivity and, hence, thermal insulation of the star. For illustration, we apply these results to estimate the internal temperature of the Vela pulsar and to study the cooling of neutron stars of ages of 0.1 - 1 Myr at the photon cooling stage. The uncertainties of the cooling models associated with our poor knowledge of chemical composition of the heat insulating envelopes strongly complicate theoretical reconstruction of the internal structure of cooling neutron stars from observations of their thermal surface emission.
description: 8 pages, 4 figures, MNRAS, accepted
A Review of the genus Macropus (Marsupialia: Macropodidae), the living grey kangaroos and their fossil allies
Creators: name: Flannery, Tim F. .
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.
A census of Post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars
Creators: name: Oudmaijer, René D.
name: Jones, Emma R. M.
name: Vioque, Miguel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: This paper presents the first census of Galactic post-Asymptotic Giant Branch stars in the HR diagram. We combined Gaia DR3 parallax-based distances with extinction corrected integrated fluxes, and derived luminosities for a sample of 185 stars that had been proposed to be post-AGB stars in the literature. The luminosities allow us to create an HR diagram containing the largest number of post-AGB candidate objects to date. A significant fraction of the objects fall outside the typical luminosity range as covered by theoretical evolutionary post-AGB tracks as well as observed for Planetary Nebula central stars. These include massive evolved supergiants and lower luminosity objects. Here we highlight the fact that one third of the post-AGB candidates is underluminous and we identify these with the recently recognised class of post-Red Giant Branch objects thought to be the result of binary evolution.
description: Accepted for publication in MNRAS Letters on July 31st, 2022. Table 1 will be available as online supplementary material
Multiply lensed star forming clumps in the A521-sys1 galaxy at redshift 1
Creators: name: Messa, Matteo
name: Dessauges-Zavadsky, Miroslava
name: Richard, Johan
name: Adamo, Angela
name: Nagy, David
name: Combes, Françoise
name: Mayer, Lucio
name: Ebeling, Harald
name: .
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the population of star-forming clumps in A521-sys1, a $\rm z=1.04$ system gravitationally lensed by the foreground ($\rm z=0.25$) cluster Abell 0521. The galaxy presents one complete counter--image with a mean magnification of $\rm μ\sim4$ and a wide arc containing two partial images of A521-sys1 with magnifications reaching $\rm μ>20$, allowing the investigations of clumps down to scales of $\rm R_{eff}<50$ pc. We identify 18 unique clumps with a total of 45 multiple images. Intrinsic sizes and UV magnitudes reveal clumps with elevated surface brightnesses, comparable to similar systems at redshifts $\rm z\gtrsim1.0$. Such clumps account for $\sim40\%$ of the galaxy UV luminosity, implying that a significant fraction of the recent star-formation activity is taking place there. Clump masses range from $\rm 10^6\ M_\odot$ to $\rm 10^9\ M_\odot$ and sizes from tens to hundreds of parsec, resulting in mass surface densities from $10$ to $\rm 10^3\ M_\odot\ pc^{-2}$, with a median of $\rm \sim10^2\ M_\odot\ pc^{-2}$. These properties suggest that we detect star formation taking place across a wide range of scale, from cluster aggregates to giant star-forming complexes. We find ages of less than $100$ Myr, consistent with clumps being observed close to their natal region. The lack of galactocentric trends with mass, mass density, or age and the lack of old migrated clumps can be explained either by dissolution of clumps after few $\sim100$ Myr or by stellar evolution making them fall below the detectability limits of our data.
description: 17 pages, 12 figures, 3 tables + appendix (6 pages, 6 figures, 2 tables). Accepted for publication in MNRAS
Formatting concepts of computer-generated operational reports
Creators: name: Roberts, Arthur Frederick William.
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.
Type III seesaw under $A_4$ modular symmetry with leptogenesis
Creators: name: Mishra, Priya
name: Behera, Mitesh Kumar
name: Panda, Papia
name: Mohanta, Rukmani
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We make an attempt to study neutrino phenomenology in the framework of type-III seesaw by considering $A_4$ modular symmetry in the super-symmetric context. In addition, we have included a local $U(1)_{B-L}$ symmetry which eventually helps us to avoid certain unwanted terms in the superpotential. Hitherto, the seesaw being type-III, it involves three fermion triplet superfields $Σ_R$, along with which, we have included a singlet weighton field $(ρ)$. In here, modular symmetry plays a crucial role by avoiding the usage of excess flavon (weighton) fields. Also, the Yukawa couplings acquire modular forms which are expressed in terms of Dedekind eta function $η(τ)$. However, for numerical analysis we use $q$ expansion expressions of these couplings. Therefore, the model discussed here is triumphant enough to accommodate the observed neutrino oscillation data and also successfully explains observed baryon asymmetry of the universe through leptogenesis.
description: 27 pages, 22 figures
Linguistic Assertiveness Handouts
Creators: name: Vellinga, Mirjam
name: Ioan, Gareth
name: Jones, Kathryn
name: Tomos, Siwan
name: Toró, Tibor
name: Ó Tiarnaigh, Pádraig
Publisher: name: Zenodo
Year: 2022
Subjects: linguistic assertiveness
linguistic submissiveness
language ideologies
language attitudes
accentism

description: A collection of handouts in various languages about linguistic assertiveness. The collection contains: a) handouts about the concept of assertiveness in English, Frisian, Hungarian, Irish and Welsh; b) an overview of the available linguistic assertiveness strategies; c) a flowchart about available choices of a conversation in Frisian. This material is intended to be used as part of the Trainers' Toolkit of the LISTEN project (https://listen-europe.eu/trainers-toolkit/).
description: This work was funded through the project LISTEN (Linguistic Assertiveness for Minority Language Speakers) by the Erasmus+ Programme of the European Union under Grant Agreement No. 2019-1-ES01-KA204-064957. These publications reflect the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
Properties of Hot Quark Matter with Neutrino Confinement In the NJL Model
Creators: name: Hajyan, G. S.
name: Alaverdyan, G. B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The thermodynamic characteristics of hot $β$-equilibrium three-flavor quark matter with neutrino confinement are studied in terms of the local SU(3) Nambu-Jona-Lasinio (NJL) model, which also accounts for the 't Hooft interaction which leads to mixing of quark flavors. For different temperatures $T \in [20 ÷100]$ MeV and baryon number densities $n_B \in [0 ÷1.8]$ fm$^{-3}$ the constituent quark masses, quark condensates, and relative contributions of individual types of particles to the pressure and chemical potentials of the constituent particles are determined. In order to determine the role of neutrinos in the hot quark matter, the pressures and energies in states with and without neutrinos are compared. Keywords: hot quark matter: neutrino confinement: NJL model: equation of state.
description: 9 pages, 8 figures
The role of the internal demagnetizing field in a surface-modulated magnonic crystal
Creators: name: Langer, Manuel
name: Röder, Falk
name: Gallardo, Rodolfo A.
name: Schneider, Tobias
name: Stienen, Sven
name: Gatel, Christophe
name: Hübner, René
name: Bischoff, Lothar
name: Lenz, Kilian
name: Lindner, Jürgen
name: Landeros, Pedro
name: Fassbender, Jürgen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnonic crystals with locally alternating properties and specific periodicities exhibit interesting effects, such as a multitude of different spin-wave states and large band gaps. This work aims for demonstrating and understanding the key role of local demagnetizing fields in such systems. To achieve this, hybrid structures are investigated consisting of a continuous thin film with a stripe modulation on top favorable due to the adjustability of the magnonic effects with the modulation size. For a direct access to the spin dynamics, a magnonic crystal was reconstructed from `bottom-up', i.e., the structural shape as well as the internal field landscape of the structure were experimentally obtained on the nanoscale using electron holography. Subsequently, both properties were utilized to perform dynamic response calculations. The simulations yield the frequency-field dependence as well as the angular dependence of spin waves in a magnonic crystal and reveal the governing role of the internal field landscape around the backward-volume geometry. The complex angle-dependent spin-wave behavior is described for a 360 degree in-plane rotation of an external field by connecting the internal field landscape with the individual spin-wave localization.
Characterizing Observed Extra Mixing Trends in Red Giants using the Reduced Density Ratio from Thermohaline Models
Creators: name: Fraser, Adrian E.
name: Joyce, Meridith
name: Anders, Evan H.
name: Tayar, Jamie
name: Cantiello, Matteo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Observations show an almost ubiquitous presence of extra mixing in low-mass upper giant branch stars. The most commonly invoked explanation for this is thermohaline mixing. One-dimensional stellar evolution models include various prescriptions for thermohaline mixing, but the use of observational data directly to discriminate between thermohaline prescriptions has thus far been limited. Here, we propose a new framework to facilitate direct comparison: Using carbon-to-nitrogen measurements from the SDSS-IV APOGEE survey as a probe of mixing and a fluid parameter known as the reduced density ratio from one-dimensional stellar evolution programs, we compare the observed amount of extra mixing on the upper giant branch to predicted trends from three-dimensional fluid dynamics simulations. Using this method, we are able to empirically constrain how mixing efficiency should vary with the reduced density ratio. We find the observed amount of extra mixing is strongly correlated with the reduced density ratio and that trends between reduced density ratio and fundamental stellar parameters are robust across choices for modeling prescription. We show that stars with available mixing data tend to have relatively low density ratios, which should inform the regimes selected for future simulation efforts. Finally, we show that there is increased mixing at low reduced density ratios, which is consistent with current hydrodynamical models of thermohaline mixing. The introduction of this framework sets a new standard for theoretical modeling efforts, as validation for not only the amount of extra mixing, but trends between the degree of extra mixing and fundamental stellar parameters is now possible.
description: 22 pages, 7 figures, accepted for publication in ApJ. MESA histories available on Zenodo at https://doi.org/10.5281/zenodo.7152746 . MESA inlists available on GitHub at https://github.com/afraser3/Empirical-Magnetic-Thermohaline
An Empirical Analysis of the Laplace and Neural Tangent Kernels
Creators: name: Lencevicius, Ronaldas Paulius
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Functional Analysis (math.FA)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: G.3
subject: 62M08 (Primary), 46C08 (Secondary)

description: The neural tangent kernel is a kernel function defined over the parameter distribution of an infinite width neural network. Despite the impracticality of this limit, the neural tangent kernel has allowed for a more direct study of neural networks and a gaze through the veil of their black box. More recently, it has been shown theoretically that the Laplace kernel and neural tangent kernel share the same reproducing kernel Hilbert space in the space of $\mathbb{S}^{d-1}$ alluding to their equivalence. In this work, we analyze the practical equivalence of the two kernels. We first do so by matching the kernels exactly and then by matching posteriors of a Gaussian process. Moreover, we analyze the kernels in $\mathbb{R}^d$ and experiment with them in the task of regression.
description: 105 pages, 23 figures, to be published in California State University's ScholarWorks repository as part of master's degree completion
Distribution-free estimation of length properties of rock joint discontinuity line traces
Creators: name: Pahl, Peter J.
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.
Achiral symmetry breaking and positive Gaussian modulus lead to scalloped colloidal membranes
Creators: name: Gibaud, Thomas
name: Kaplan, C. Nadir
name: Sharma, Prerna
name: Ward, Andrew
name: Zakhary, Mark J.
name: Oldenbourg, Rudolf
name: Meyer, Robert B.
name: Kamien, Randall D.
name: Powers, Thomas R.
name: Dogic, Zvonimir
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In the presence of a non-adsorbing polymer, monodisperse rod-like particles assemble into colloidal membranes, which are one rod-length thick liquid-like monolayers of aligned rods. Unlike 3D edgeless bilayer vesicles, colloidal monolayer membranes form open structures with an exposed edge, thus presenting an opportunity to study physics of thin elastic sheets. Membranes assembled from single-component chiral rods form flat disks with uniform edge twist. In comparison, membranes comprised of mixture of rods with opposite chiralities can have the edge twist of either handedness. In this limit disk-shaped membranes become unstable, instead forming structures with scalloped edges, where two adjacent lobes with opposite handedness are separated by a cusp-shaped point defect. Such membranes adopt a 3D configuration, with cusp defects alternatively located above and below the membrane plane. In the achiral regime the cusp defects have repulsive interactions, but away from this limit we measure effective long-ranged attractive binding. A phenomenological model shows that the increase in the edge energy of scalloped membranes is compensated by concomitant decrease in the deformation energy due to Gaussian curvature associated with scalloped edges, demonstrating that colloidal membranes have positive Gaussian modulus. A simple excluded volume argument predicts the sign and magnitude of the Gaussian curvature modulus that is in agreement with experimental measurements. Our results provide insight into how the interplay between membrane elasticity, geometrical frustration and achiral symmetry breaking can be used to fold colloidal membranes into 3D shapes.
description: Main text: 25 pages, 6 figures. Supplementary information: 6 pages, 6 figures
Towards In Silico Mining for Superconductors -- Cutting the Gordian Knot
Creators: name: Babic, Vedad
name: Panas, Itai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A random forest regression based supervised machine learning method to predict experimental critical temperature of superconductivity from the electronic band structure, as obtained from Density Functional Theory, is demonstrated. This complementarity between experiment and theory draws inspiration from the merging of Kohn-Sham and Bogoliubov-De Gennes equations [W. Kohn, W, EKU Gross, and LN Oliveira, Int. J. of Quant. Chem., 36(23), 611-615 (1989)]. Features in the Kohn-Sham Density Functional Theory band structure away from EF becoming decisive for the superconducting gap demonstrates this divide-and-conquer physical understanding. Not committing to any microscopic mechanism for the SC at this stage, it implies that in different classes of materials, different electronic features are responsible for the superconductivity. However, training on known members of a class, the performance of new members may be predicted. The method is validated for the A15 materials, including both binary A3X and ternary A6XY intermetallics, A=V, Nb, demonstrating that the two do indeed belong to the same class of superconductors.
description: 12 pages, 4 figures and Supplementary Information containing 8 additional figures
Studium przypadku skuteczności nowych metod optymalizacji roju w porównaniu do metod znanych.
Creators: name: Baumgart, Jan
name: Sangho, Belco
Publisher: name: Studia i Materiały Informatyki Stosowanej
Year: 2021

description: Porównianie skuteczności nowych metod optymalizacji roju w porównaniu z metodami znanymi w dziedzinie. Inspirowane naturą algorytmy metaheurystyczne stają się coraz bardziej popularne w rozwiązywaniu problemów optymalizacyjnych. Dzięki ich popularności niemal codziennie możemy zobaczyć nowe podejścia i proponowane rozwiązania. W tym artykule przedstawię porównanie, które pokaże kilka najnowszych prac z tej dziedziny w porównaniu z niektórymi algorytmami traktowanymi jako podstawa dziedziny. Głównym celem było porównanie ostatnio wprowadzonych algorytmów roju i określenie, kiedy nowe rozwiązania są faktycznie szybsze i bardziej precyzyjne. Podsumowując, czy przetestowane nowe podejścia są lepsze niż obecne, dobrze znane i ugruntowane w terenie algorytmy. Algorytmy brane pod uwagę w tej pracy to: Particle Swarm Optimization [5], Artifical Bee Colony [3], Elephant Herding Optimization [7], Whale Optimization [4] i Grasshopper Optimization [6].Algorytmy uznawane za nowe w tej dziedzinie porównano z dwoma popularnymi i dobrze znanymi algorytmami metaheurystycznymi pod względem dokładności znalezionych rozwiązań i szybkości. Zgodnie z wynikami eksperymentów większość porównywanych nowych algorytmów dawała zadowalające wyniki w użytkowaniu.
description: Studia i Materiały Informatyki Stosowanej, Tom 13 Nr 1 (2021): Studia i Materiały Informatyki Stosowanej
EMISSA -- Exploring Millimetre Indicators of Solar-Stellar Activity II. Towards a robust indicator of stellar activity
Creators: name: Mohan, Atul
name: Wedemeyer, Sven
name: Hauschildt, Peter H.
name: Pandit, Sneha
name: Saberi, Maryam
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: An activity indicator, which can provide a robust quantitative mapping between the stellar activity and the physical properties of its atmosphere, is important in exploring the physics of activity across spectral types. But the common activity indicators show large variability in their values which makes defining a robust quantitative scale difficult. Millimetre (mm) wavelengths probe the different atmospheric layers within the stellar chromosphere providing a tomographic view of the atmospheric dynamics. The project aims to define a robust mm-based activity indicator for the cool main-sequence stars ($\mathrm{T_{eff}} \sim$ 5000 - 7000 K). We derive the mm-brightness temperature ($\mathrm{T_B(ν)}$) spectral indices ($\mathrm{α_{mm}}$) for cool stars including the Sun using archival data in the 30 - 1000 GHz range. The derived values for $\mathrm{α_{mm}}$ are explored as a function of various physical parameters and empirical power-law functions were derived. $\mathrm{α_{mm}}$ estimates were also compared with other activity indicators. Despite the estimation errors, $\mathrm{α_{mm}}$ values could well distinguish the cool stars, unlike common activity indicators. The low estimation errors on the derived trends of $\mathrm{α_{mm}}$ versus physical parameters suggest that $\mathrm{α_{mm}}$ could be a robust activity indicator. $\mathrm{α_{mm}}$, which is linked to chromospheric thermal stratification and activity in cool stars can well distinguish and physically characterise the stars more robustly than common activity indicators. We emphasise the need for multi-frequency data across the mm-band for stars, with a range of physical parameters and gathered at multiple epochs during activity cycles. This will help explore $\mathrm{α_{mm}}$ in a statistically robust manner and study the emergence of chromospheric heating on the main-sequence.
description: Accepted in A&A Letters
Infinite matter properties and zero-range limit of nonrelativistic finite-range interactions
Creators: name: Davesne, D.
name: Becker, P.
name: Pastore, A.
name: Navarro, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss some infinite matter properties of two finite-range interactions widely used for nuclear structure calculations, namely Gogny and M3Y interactions. We show that some useful informations can be deduced for the central, tensor and spin-orbit terms from the spin-isospin channels and the partial wave decomposition of the symmetric nuclear matter equation of state. We show in particular that the central part of the Gogny interaction should benefit from the introduction of a third Gaussian and the tensor parameters of both interactions can be deduced from special combinations of partial waves. We also discuss the fact that the spin-orbit of the M3Y interaction is not compatible with local gauge invariance. Finally, we show that the zero-range limit of both families of interactions coincides with the specific form of the zero-range N3LO Skyrme interaction and we emphasize from this analogy the benefits of N3LO.
description: 30 pages
A beam spectrometer for studies of radioastronomically interesting molecular ions
Creators: name: Ninkov, Zocan.
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.