cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Controlling inversion and time-reversal symmetries by subcycle pulses in the one-dimensional extended Hubbard model
Creators: name: Shinjo, Kazuya
name: Sota, Shigetoshi
name: Yunoki, Seiji
name: Tohyama, Takami
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Owning to their high controllability, laser pulses have contributed greatly to our understanding of strongly correlated electron systems. However, typical multicycle pulses do not control the symmetry of systems that plays an important role in the emergence of novel quantum phases. Here, we demonstrate that subcycle pulses whose oscillation is less than one period within a pulse envelope can control inversion and time-reversal symmetries in the electronic states of the one-dimensional extended Hubbard model. Using an ultrashort subcycle pulse, one can generate a steady electric current (SEC) in a photoexcited state due to an Aharonov-Bohm flux instantaneously introduced through the phase of an electric field. Consequently, time-reversal symmetry is broken. In contrast, a broad subcycle pulse does not induce SEC but instead generates electric polarization, thus breaking inversion symmetry. Both symmetry breakings in a photoexcited state can be monitored by second harmonic generation. These findings provide a new methodology for designing the symmetries of electronic states and open up a new field of subcycle-pulse engineering.
description: 8 pages, 7 figures
Constraints on Yukawa gravity parameters from observations of bright stars
Creators: name: Jovanović, P.
name: Jovanović, V. Borka
name: Borka, D.
name: Zakharov, A. F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we investigate a Yukawa gravity modification of the Newtonian gravitational potential in a weak field approximation. For that purpose we derived the corresponding equations of motion and used them to perform two-body simulations of the stellar orbits. In 2020 the GRAVITY Collaboration detected the orbital precession of the S2 star around the supermassive black hole (SMBH) at the Galactic Center (GC) and showed that it is close to the general relativity (GR) prediction. Using this observational fact, we evaluated parameters of the Yukawa gravity (the range of Yukawa interaction $Λ$ and universal constant $δ$) with the Schwarzschild precession of the S-stars assuming that the observed values as indicated by the GRAVITY Collaboration will have a small deviation from GR prediction. GR provides the most natural way to fit observational data for S-star orbits, however, their precessions can be fitted by Yukawa gravity. Our main goal was to study the possible influence of the strength of Yukawa interaction, i.e. the universal constant $δ$, on the precessions of S-star orbits. We analyze S-star orbits assuming different strength of Yukawa interaction $δ$ and find that this parameter has strong influence on range of Yukawa interaction $Λ$. For that purpose we use PPN equations of motion in order to calculate the simulated orbits of S-stars in GR and Yukawa gravity. Using MCMC simulations we obtain the best-fit values and uncertainties of Yukawa gravity parameters for S-stars. Also, we introduce a new criterion which can be used for classification of gravitational systems in this type of gravity, according to their scales. We demonstrated that performed analysis of the observed S-stars orbits around the GC in the frame of the Yukawa gravity represent a tool for constraining the Yukawa gravity parameters and probing the predictions of gravity theories.
description: 25 pages, 2 tables, 5 figures. Published in J. Cosmol. Astropart. P
Zeno effect and ergodicity in finite-time quantum measurements
Creators: name: Sokolovski, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate that an attempt to measure a non-local in time quantity, such as the time average $\la A\ra_T$ of a dynamical variable $A$, by separating Feynman paths into ever narrower exclusive classes traps the system in eigensubspaces of the corresponding operator $\a$. Conversely, in a long measurement of $\la A\ra_T$ to a finite accuracy, the system explores its Hilbert space and is driven to a universal steady state in which von Neumann ensemble average of $\a$ coincides with $\la A\ra_T$. Both effects are conveniently analysed in terms of singularities and critical points of the corresponding amplitude distribution and the Zeno-like behaviour is shown to be a consequence of conservation of probability.
title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¿Ð¾Ð´Ð°ÑÐ»Ð¸Ð²Ð¾ÑÑÐµÐ¹ ÑÑÐ°Ð»ÑÐ½ÑÑ Ð¶ÐµÑÑÐºÐ¸Ñ Ð±Ð°Ð· ÐºÐ¾Ð»Ð¾Ð½Ð½
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Research compliances rigid steel bases of the columns
Creators: name: ÐÐ¾ÑÐ¾Ð·Ð¾Ð²ÑÐºÐ¸Ð¹, ÐÐ°Ð²ÐµÐ»
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÐÐ¾Ð»Ð¾Ð½Ð½Ñ ÑÑÐ°Ð»ÑÐ½ÑÐµ
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description: Ð ÑÐ°Ð±Ð¾ÑÐµ ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÑÑÑ Ð¿Ð¾Ð´Ð°ÑÐ»Ð¸Ð²Ð¾ÑÑÑ Ð¶ÐµÑÑÐºÐ¾Ð³Ð¾ ÑÐ·Ð»Ð° ÑÑÐ°Ð»ÑÐ½Ð¾Ð¹ ÐºÐ¾Ð»Ð¾Ð½Ð½Ñ ÑÐ¸Ð¿Ð¾Ð²Ð¾Ð³Ð¾ Ð´Ð²ÑÑÐ°Ð²ÑÐ¾Ð²Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ Ð¿Ð¾Ð´ Ð´ÐµÐ¹ÑÑÐ²Ð¸ÐµÐ¼ Ð²Ð½ÐµÑÐµÐ½ÑÑÐµÐ½Ð½Ð¾-ÑÐ¶Ð¸Ð¼Ð°ÑÑÐµÐ¹ Ð½Ð°Ð³ÑÑÐ·ÐºÐ¸ Ñ ÑÐ»ÑÑÐ°Ð¹Ð½ÑÐ¼ ÑÐºÑÑÐµÐ½ÑÑÐ¸ÑÐ¸ÑÐµÑÐ¾Ð¼. Ð Ð°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ð° ÑÐ¿ÑÐ¾ÑÐµÐ½Ð½Ð°Ñ ÑÑÐµÐ¼Ð° Ð·Ð°ÑÐµÐ¼Ð»ÐµÐ½Ð¸Ñ â Ð¶ÐµÑÑÐºÐ¾ÑÐ°ÑÐ½Ð¸ÑÐ½Ð°Ñ. Ð¢Ð°ÐºÐ¶Ðµ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ð° Ð°Ð½Ð°Ð»Ð¾Ð³Ð¸ÑÐ½Ð°Ñ ÑÑÐµÐ¼Ð°, Ð³Ð´Ðµ Ð¶ÐµÑÑÐºÐ°Ñ ÑÐ°ÑÑÑ ÑÑÐµÑÐ¶Ð½Ñ ÑÐ¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð° Ð² Ð²Ð¸Ð´Ðµ ÑÐ·Ð»Ð° ÑÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ°, ÑÑÐ½Ð´Ð°Ð¼ÐµÐ½ÑÐ½Ð¾Ð¹ Ð¿Ð»Ð¸ÑÑ, ÑÑÐ°Ð²ÐµÑÑ Ð¸ Ð¿Ð»Ð°Ð½Ð¾Ðº Ñ Ð°Ð½ÐºÐµÑÐ½ÑÐ¼Ð¸ Ð±Ð¾Ð»ÑÐ°Ð¼Ð¸. ÐÐ²ÑÐ¾ÑÐ°Ð¼Ð¸ Ð±ÑÐ»Ð¸ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ñ ÑÐ¸ÑÐ»ÐµÐ½Ð½ÑÐµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð´Ð°Ð½Ð½Ð¾Ð³Ð¾ ÑÐ·Ð»Ð° Ñ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼ Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½Ð¾Ð³Ð¾ ÐºÐ¾Ð¼Ð¿Ð»ÐµÐºÑÐ° ÐÐ±Ð°ÐºÑÑ 2017. ÐÐ½Ð°Ð»Ð¸Ð· ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð² ÑÐ°Ð±Ð¾ÑÑ Ð¿Ð¾ÐºÐ°Ð·Ð°Ð», ÑÑÐ¾ ÑÑÐµÑ Ð¿Ð¾Ð´Ð°ÑÐ»Ð¸Ð²Ð¾ÑÑÐ¸ Ð¿ÑÐ¸ Ð´Ð¾ÑÑÐ°ÑÐ¾ÑÐ½Ð¾ ÑÐ¾ÑÐ½Ð¾Ð¼ ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾Ð¼ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ð¸ Ð´Ð°ÐµÑ Ð¾Ð´Ð¸Ð½Ð°ÐºÐ¾Ð²ÑÐµ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ ÑÐ¶Ð¸Ð¼Ð°ÑÑÐ¸Ñ ÑÑÐ¸Ð»Ð¸Ð¹. Ð¢Ð°ÐºÐ¸Ð¼ Ð¾Ð±ÑÐ°Ð·Ð¾Ð¼, Ð´Ð°Ð½Ð½ÑÐ¹ ÑÐ·ÐµÐ» Ð¼Ð¾Ð¶Ð½Ð¾ ÑÑÐ¸ÑÐ°ÑÑ Ð¶ÐµÑÑÐºÐ¸Ð¼, Ð° ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½Ñ Ð¿ÑÐ¾Ð´Ð¾Ð»ÑÐ½Ð¾Ð³Ð¾ Ð¸Ð·Ð³Ð¸Ð±Ð° Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¸ ÑÐ°Ð²ÐµÐ½ ÑÐµÐ¾ÑÐµÑÐ¸ÑÐµÑÐºÐ¾Ð¼Ñ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ñ.
description: The master's thesis considers the compliance of a rigid assembly of a steel column of a typical I-
section under the loads of an eccentric-compressive load with a random eccentricity. A simplified scheme of pinching a rigid hinge is considered as well as its detailed version in which the rigid part of the rod is elaborated as a basement, foundation plate, cross-arm and anchor bolts with plates. The authors carried out numerical studies of this site using a computer complex Abaqus 2017. Analysis of the results showed that the inclusion of compliance at a sufficiently accurate numerical simulation gives the same value for compressive forces. Thus, this node can be considered rigid, and the coefficient of buckling is almost equal to the theoretical value.
Matrix models and stochastic growth in Donaldson-Thomas theory
Creators: name: Szabo, Richard J.
name: Tierz, Miguel
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We show that the partition functions which enumerate Donaldson-Thomas invariants of local toric Calabi-Yau threefolds without compact divisors can be expressed in terms of specializations of the Schur measure. We also discuss the relevance of the Hall-Littlewood and Jack measures in the context of BPS state counting and study the partition functions at arbitrary points of the Kaehler moduli space. This rewriting in terms of symmetric functions leads to a unitary one-matrix model representation for Donaldson-Thomas theory. We describe explicitly how this result is related to the unitary matrix model description of Chern-Simons gauge theory. This representation is used to show that the generating functions for Donaldson-Thomas invariants are related to tau-functions of the integrable Toda and Toeplitz lattice hierarchies. The matrix model also leads to an interpretation of Donaldson-Thomas theory in terms of non-intersecting paths in the lock-step model of vicious walkers. We further show that these generating functions can be interpreted as normalization constants of a corner growth/last-passage stochastic model.
description: 31 pages; v2: comments and references added; v3: presentation improved, comments added; final version to appear in Journal of Mathematical Physics
HOPS 361-C's Jet Decelerating and Precessing Through NGC 2071 IR
Creators: name: Rubinstein, Adam E.
name: Karnath, Nicole
name: Quillen, Alice C.
name: Federman, Samuel
name: Green, Joel D.
name: Chambers, Edward T.
name: Watson, Dan M.
name: Megeath, S. Thomas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a two-epoch Hubble Space Telescope (HST) study of NGC 2071 IR highlighting HOPS 361-C, a protostar producing an arced 0.2 parsec-scale jet. Proper motions for the brightest knots decrease from 350 to 100 km/s with increasing distance from the source. The [Fe II] and Pa$β$ emission line intensity ratio gives a velocity jump through each knot of 40--50 km/s. A new [O I] 63 \mic\ spectrum, taken with the German REciever for Astronomy at Terahertz frequencies (GREAT) instrument aboard Stratospheric Observatory for Infrared Astronomy (SOFIA), shows a low line-of-sight velocity indicative of high jet inclination. Proper motions and jump velocities then estimate 3D flow speed for knots. Subsequently, we model knot positions and speeds with a precessing jet that decelerates. Measurements are matched with a precession period of 1,000--3,000 years and half opening angle of $15^\circ$. The [Fe II] 1.26-to-1.64 \mic\ line intensity ratio determines visual extinction to each knot from 5--30 mag. Relative to $\sim$14 mag of extinction through the cloud from $\rm{C}^{18}$O emission maps, the jet is embedded at a 1/5 to 4/5 fractional cloud depth. Our model suggests the jet is dissipated over a 0.2 pc arc. This short distance may result from the jet sweeping through a wide angle, allowing the cloud time to fill cavities opened by the jet. Precessing jets contrast with nearly unidirectional protostellar jets that puncture host clouds and can propagate significantly further.
description: 25 pages, 10 figures, submitted to ApJ on 22-11-2022, revised until 8-3-2023, accepted 9-3-2023
Extraction of timelike entanglement from the quantum vacuum
Creators: name: Olson, S. Jay
name: Ralph, Timothy C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently, it has been shown that the massless quantum vacuum state contains entanglement between timelike separated regions of spacetime, in addition to the entanglement between the spacelike separated regions usually considered. Here, we show that timelike entanglement can be extracted from the Minkowski vacuum and converted into ordinary entanglement between two inertial, two-state detectors at the same spatial location -- one coupled to the field in the past and the other coupled to the field in the future. The procedure used here demonstrates a clear time correlation as a requirement for extraction, e.g. if the past detector was active at a quarter to 12:00, then the future detector must wait to become active at precisely a quarter past 12:00 in order to achieve entanglement.
description: 8 pages, 3 figures
Investigation of bone resorption within a cortical basic multicellular unit using a lattice-based computational model
Creators: name: Buenzli, P. R.
name: Jeon, J.
name: Pivonka, P.
name: Smith, D. W.
name: Cummings, P. T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: Biological Physics (physics.bio-ph)
subject: Medical Physics (physics.med-ph)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: In this paper we develop a lattice-based computational model focused on bone resorption by osteoclasts in a single cortical basic multicellular unit (BMU). Our model takes into account the interaction of osteoclasts with the bone matrix, the interaction of osteoclasts with each other, the generation of osteoclasts from a growing blood vessel, and the renewal of osteoclast nuclei by cell fusion. All these features are shown to strongly influence the geometrical properties of the developing resorption cavity including its size, shape and progression rate, and are also shown to influence the distribution, resorption pattern and trajectories of individual osteoclasts within the BMU. We demonstrate that for certain parameter combinations, resorption cavity shapes can be recovered from the computational model that closely resemble resorption cavity shapes observed from microCT imaging of human cortical bone.
description: 17 pages, 11 figures, 1 table. Revised version: paper entirely rewritten for a more biology-oriented readership. Technical points of model description now in Appendix. Addition of two new figures (Fig. 5 and Fig. 9) and removal of former Fig. 4
Dielectric screening at TMD:hBN interfaces: Monolayer-to-bulk transition, local-field effect, and spatial dependence
Creators: name: Adeniran, Olugbenga
name: Liu, Zhen-Fei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The dielectric effects of a substrate have been shown to be important in modulating the electronic properties of an adsorbate, especially in van der Waals heterostructures. Here, using the first-principles dielectric embedding $GW$ approach within the framework of many-body perturbation theory, we perform a case study on the dielectric screening effects of hexagonal boron nitride (hBN) on various transition-metal dichalcogenides (TMDs). We consider three systems: monolayer MoS$_2$, bilayer MoS$_2$, and mixed WS$_2$/MoS$_2$ bilayer adsorbed on hBN, and examine three aspects of the substrate dielectric screening: (i) thickness dependence and the monolayer-to-bulk transition, where we consider the effects of one-, two-, three-, and four-layer hBN; (ii) local-field effect, where we numerically assess a common approximation of neglecting the in-plane local-field components of the substrate polarizability; and (iii) spatial dependence, where we consider mixed WS$_2$/MoS$_2$ bilayer adsorbed on hBN with either side facing the substrate. Our results provide quantitative insight into how the substrate screening effects can be leveraged for band structure engineering.
description: 9 pages, 4 figures
Renormalized non-modal theory of the kinetic drift instability of plasma shear flows
Creators: name: Mikhailenko, V. S.
name: Mikhailenko, V. V.
name: Stepanov, K. N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The linear and renormalized nonlinear kinetic theory of drift instability of plasma shear flow across the magnetic field, which has the Kelvin's method of shearing modes or so-called non-modal approach as its foundation, is developed. The developed theory proves that the time-dependent effect of the finite ion Larmor radius is the key effect, which is responsible for the suppression of drift turbulence in an inhomogeneous electric field. This effect leads to the non-modal decrease of the frequency and growth rate of the unstable drift perturbations with time. We find that turbulent scattering of the ion gyrophase is the dominant effect, which determines extremely rapid suppression of drift turbulence in shear flow.
3D facial morphology and risk of sleep disordered breathing in children
Creators: name: Wu, Felix Yun Hei
Publisher: name: University of British Columbia
Year: 2020

description: Introduction: Craniofacial morphology has been recognized as an important factor in obstructive sleep apnea (OSA) pathogenesis and pathophysiology. Stereophotogrammetry eliminates many of the limitations of traditional craniofacial anthropometric methods. Objectives: To utilize stereophotogrammetry to determine whether associations exist between 3D facial morphometric parameters of children aged 2-17 years, and their risk of sleep-disordered breathing (SDB) as evidenced by their Pediatric Sleep Questionnaire (PSQ) score. Additionally, to compare facial morphology of patients at high risk of SDB and those at lower risk. Methods: 180 patients from the Otolaryngology Clinic at BC Children’s Hospital were recruited for this cross-sectional study. 3D facial images were acquired using the 3dMD Face system, and linear and angular measurements were calculated. Patients’ SDB risk was evaluated using the PSQ. Linear regression models were used to determine associations between PSQ scores and patient demographic and facial morphometric variables. 3D morphometric analysis was performed to assess for differences in facial morphology in subjects at high risk for SDB (PSQ score ≥ 0.33) and those at lower risk (PSQ score < 0.33). Results: 33.9% of the patients scored at high risk for SDB. No statistically significant associations were found between PSQ score and any 3D facial morphometric parameter. In addition, PSQ score was not found to be associated with gender, age, age:gender interaction, or body mass index. Geometric morphometric analysis found no difference in facial shape in those at high risk for SDB and those at lower risk. Conclusions: No linear or angular measurements assessed in this study were found to have a strong correlation with PSQ score. Similarly, age, gender, its interaction, and BMI were not found to have an effect on PSQ. Geometric morphometric analysis found no difference in facial shape in those at high risk and those at lower risk of SDB as evidenced by PSQ. A pediatric patient at risk of SDB may not display obvious craniofacial attributes, thus screening for SDB should be primarily based on patient signs and symptoms.
Properties of the String Operator in the Eight-Vertex Model
Creators: name: Fabricius, Klaus
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The construction of creation operators of exact strings in eigenvectors of the eight vertex model at elliptic roots of unity of the crossing parameter which allow the generation of the complete set of degenerate eigenstates is based on the conjecture that the 'naive' string operator vanishes. In this note we present a proof of this conjecture. Furthermore we show that for chains of odd length the string operator is either proportional to the symmetry operator $S$ or vanishes depending on the precise form of the crossing parameter.
description: 18 pages, typographic errors corrected
Ariosto sulla luna: un percorso didattico sull’intertestualità tra l’Orlando furioso e Il castello dei destini incrociati di Italo Calvino attraverso il metodo Jigsaw
Creators: name: Galli, Lia
Publisher: name: Scuola Universitaria della Svizzera Italiana (SUPSI)
Year: 2016

description: Questo lavoro di diploma presenta un percorso didattico, sperimentato con la 3E del Liceo Lugano 1, sull’intertestualità tra l’Orlando furioso (1516 -1532) di Ludovico Ariosto e Il castello dei destini incrociati (1969) di Italo Calvino. Grazie a un questionario si sono potute scoprire le preconoscenze e le misconcezioni degli allievi della classe rispetto al tema dell’intertestualità, e a partire da esse si è concepito il progetto di lavoro qui presentato. Per permettere agli studenti di indagare i rapporti intertestuali tra queste due opere ho scelto di utilizzare il metodo Jigsaw, sviluppato da Aronson, per favorire la collaborazione, l’integrazione e la cooperazione tra gli studenti. Questo metodo ha permesso agli allievi di lavorare a gruppi direttamente sui testi, facendo un lavoro di comparazione incentrato su quattro tematiche fondamentali indicate dalla 3E (la figura di Orlando e la follia; la figura di Astolfo; la luna; il castello incantato), che ricorrono sia nell’opera di Ariosto sia in quella di Calvino. Il metodo Jigsaw ha dunque consentito alla classe di rilevare in modo abbastanza autonomo le modalità con cui i rapporti intertestuali si esprimono nelle due opere, e quindi ha permesso che gli studenti scoprissero analogie e differenze rispetto al significato che questi temi assumono nei due testi. Relatore: Simone Fornara. Materia: italiano
Supplementary document for High-fidelity Color Image Restoration from a Disturbed Graded-index Imaging System by Deep Neural Networks - 6280473.pdf
Creators: name: Yang, Yang
name: Hu, Xuanyu
name: Duan, ZiPeng
name: Tan, Yehong
name: Zhou, Ruiqi
name: Zeng, Jinwei
name: Wang, Jian
name: Xiao, Jion
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Principle derivation
Robust maximization of asymptotic growth
Creators: name: Kardaras, Constantinos
name: Robertson, Scott
Publisher: name: arXiv
Year: 2010
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics

description: This paper addresses the question of how to invest in a robust growth-optimal way in a market where the instantaneous expected return of the underlying process is unknown. The optimal investment strategy is identified using a generalized version of the principal eigenfunction for an elliptic second-order differential operator, which depends on the covariance structure of the underlying process used for investing. The robust growth-optimal strategy can also be seen as a limit, as the terminal date goes to infinity, of optimal arbitrages in the terminology of Fernholz and Karatzas [Ann. Appl. Probab. 20 (2010) 1179-1204].
description: Published in at http://dx.doi.org/10.1214/11-AAP802 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: ÐÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ñ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²ÐµÐ½Ð½Ð¾-ÑÐ¾ÑÐ³Ð¾Ð²Ð¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÑÐµÑÑÐ¾ÑÐ°Ð½Ð° ÐºÐ¾ÑÐµÐ¹ÑÐºÐ¾Ð¹ ÐºÑÑ Ð½Ð¸ Ð¿Ð¾ Ð°Ð´ÑÐµÑÑ: Ð³. Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³, ÑÐ». ÐÐ°ÑÑÐ°Ð²ÑÐºÐ°Ñ, Ð´. 23, Ðº. 1
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Organozation of production and trading activities of a cafe specializing in korean cuisine by the address: St. Petersburg, Varshavskaya str., 23/1
Creators: name: ÐÐ°ÑÐ¾Ð²Ð°, ÐÑÐ¸ÑÑÐ¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÑÐµÑÑÐ¾ÑÐ°Ð½
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restaurant
korean cuisine
menu
production program
production and trading activities

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description: The marketing study and the rationale for placing a restaurant specializing in
korean cuisine was made in St. Petersburg. The number of places was determined, the technological calculation of necessary
premises was made, equipment was selected according to the required parameters.
The optimal organizational structure and the security system of the enterprise has
been worked out. The economic expediency of the enterpriseâs design was justified,
and the organizational and planning decision was determined.
Detecting topological phases in the square-octagon lattice with statistical methods
Creators: name: Wunderlich, Paul
name: Ferrari, Francesco
name: Valentí, Roser
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Electronic systems living on Archimedean lattices such as kagome and square-octagon networks are presently being intensively discussed for the possible realization of topological insulating phases. Coining the most interesting electronic topological states in an unbiased way is however not straightforward due to the large parameter space of possible Hamiltonians. A possible approach to tackle this problem is provided by a recently developed statistical learning method [T. Mertz and R. Valentí, Phys. Rev. Research 3, 013132 (2021)], based on the analysis of a large data sets of randomized tight-binding Hamiltonians labeled with a topological index. In this work, we complement this technique by introducing a feature engineering approach which helps identifying polynomial combinations of Hamiltonian parameters that are associated with non-trivial topological states. As a showcase, we employ this method to investigate the possible topological phases that can manifest on the square-octagon lattice, focusing on the case in which the Fermi level of the system lies at a high-order van Hove singularity, in analogy to recent studies of topological phases on the kagome lattice at the van Hove filling.
description: 9 pages, 6 figures
Parameterizing Network Graph Heterogeneity using a Modified Weibull Distribution
Creators: name: Ozbay, Sinan A.
name: Nguyen, Maximilian M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present a simple method to quantitatively capture the heterogeneity in the degree distribution of a network graph using a single parameter $σ$. Using an exponential transformation of the shape parameter of the Weibull distribution, this control parameter allows the degree distribution to be easily interpolated between highly symmetric and highly heterogeneous distributions on the unit interval. This parameterization of heterogeneity also recovers several other canonical distributions as intermediate special cases, including the Gaussian, Rayleigh, and exponential distributions. We then outline a general graph generation algorithm to produce graphs with a desired amount of heterogeneity. The utility of this formulation of a heterogeneity parameter is demonstrated with examples relating to epidemiological modeling and spectral analysis.
First-Order Logical Duality
Creators: name: Awodey, Steve
name: Forssell, Henrik
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic (math.LO)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 03G30, 18B25, 18C10, 18C50, 18F20

description: From a logical point of view, Stone duality for Boolean algebras relates theories in classical propositional logic and their collections of models. The theories can be seen as presentations of Boolean algebras, and the collections of models can be topologized in such a way that the theory can be recovered from its space of models. The situation can be cast as a formal duality relating two categories of syntax and semantics, mediated by homming into a common dualizing object, in this case 2. In the present work, we generalize the entire arrangement from propositional to first-order logic. Boolean algebras are replaced by Boolean categories presented by theories in first-order logic, and spaces of models are replaced by topological groupoids of models and their isomorphisms. A duality between the resulting categories of syntax and semantics, expressed first in the form of a contravariant adjunction, is established by homming into a common dualizing object, now $\Sets$, regarded once as a boolean category, and once as a groupoid equipped with an intrinsic topology. The overall framework of our investigation is provided by topos theory. Direct proofs of the main results are given, but the specialist will recognize toposophical ideas in the background. Indeed, the duality between syntax and semantics is really a manifestation of that between algebra and geometry in the two directions of the geometric morphisms that lurk behind our formal theory. Along the way, we construct the classifying topos of a decidable coherent theory out of its groupoid of models via a simplified covering theorem for coherent toposes.
description: Final pre-print version. 62 pages
A marine megafaunal extinction and its consequences for kelp forests of the North Pacific
Creators: name: Bullen, Cameron David
Publisher: name: University of British Columbia
Year: 2020

description: Restoration of lost ecosystem functions and species interactions is increasingly seen as central to addressing the extensive degradation of ecosystems and associated losses of biodiversity and ecosystem services. To be effective, such restoration efforts require an understanding of how ecosystems functioned prior to human-caused extinctions and ecological transformations. Global declines of megafauna, such as the extinction of the Steller’s sea cow, are largely a consequence of human action and likely had significant and widespread ecological impacts. Drawing on historical evidence, kelp forest ecology, and extant mammalian herbivore ecology, I first propose six discrete hypotheses about the effects Steller’s sea cows may have had on North Pacific kelp forest dynamics. The natural history observations, historic accounts, and ecological evidence I review offer partial support for these hypotheses. Accordingly, I argue that Steller’s sea cows exerted a significant top-down influence in kelp forests, likely affecting physical ecosystem structure, productivity, nutrient cycling, species interactions, and the export of nutrients to surrounding ecosystems. Next, I build upon these hypotheses to develop an ecosystem model which re-introduces this extinct megaherbivore and highlights its former role in ecosystem dynamics and species interactions in kelp forests. I find that, while not a keystone species, Steller’s sea cows likely had a significant effect on ecosystem dynamics, influencing community composition and increasing the productivity and resilience of kelp forests. The model indicates the presence of Steller’s sea cows may also have enabled the coexistence of sea otters and some large invertebrates, suggesting that the often-seen decline of invertebrate populations caused by sea otters may be a phenomenon exacerbated by lost ecosystem functions and species interactions associated with the extinction of the Steller’s sea cow. My findings suggest that kelp forest dynamics and resilience were significantly altered prior to the influence of more recent and well-known stressors, and demonstrate the important ecological roles that can be lost with megafaunal extinction. This work also illustrates the degree to which the loss of species interactions has likely affected North Pacific ecosystems, and how using ecosystem models to consider past ecosystem dynamics can inform management and restoration of current social-ecological systems.
Revisiting the Flowers-Ruderman instability of magnetic stars
Creators: name: Marchant, Pablo
name: Reisenegger, Andreas
name: Akgün, Taner
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In 1977, Flowers and Ruderman described a perturbation that destabilises a purely dipolar magnetic field in a fluid star. They considered the effect of cutting the star in half along a plane containing the symmetry axis and rotating each half by $90\degr$ in opposite directions, which would cause the energy of the magnetic field in the exterior of the star to be greatly reduced, just as it happens with a pair of aligned magnets. We formally solve for the energy of the external magnetic field and check that it decreases monotonously along the entire rotation. We also describe the instability using perturbation theory, and see that it happens due to the work done by the interaction of the magnetic field with surface currents. Finally, we consider the stabilising effect of adding a toroidal field by studying the potential energy perturbation when the rotation is not done along a sharp cut, but with a continuous displacement field that switches the direction of rotation across a region of small but finite width. Using these results, we estimate the relative strengths of the toroidal and poloidal field needed to make the star stable to this displacement and see that the energy of the toroidal field required for stabilisation is much smaller than the energy of the poloidal field. We also show that, contrary to a common argument, the Flowers-Ruderman instability cannot be applied many times in a row to reduce the external magnetic energy indefinitely.
description: Uploaded complete version with corrections from the MNRAS referee
Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters
Creators: name: Briscoe, Jack D
name: Logue, Fraser D
name: Pizzey, Danielle
name: Wrathmall, Steven A
name: Hughes, Ifan G
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Cascading light through two thermal vapour cells has been shown to improve the performance of atomic filters that aim to maximise peak transmission over a minimised bandpass window. In this paper, we explore the atomic physics responsible for the operation of the second cell, which is situated in a transverse (Voigt) magnetic field and opens a narrow transmission window in an optically thick atomic vapour. By assuming transitions with Gaussian line shapes and magnetic fields sufficiently large to access the hyperfine Paschen-Back regime, the window is modelled by resolving the two transitions closest to line centre. We discuss the validity of this model and perform an experiment which demonstrates the evolution of a naturally abundant Rb transmission window as a function of magnetic field. The model results in a significant reduction in two-cell parameter space, which we use to find theoretical optimised cascaded line centre filters for Na, K, Rb and Cs across both D lines. With the exception of Cs, these all have a better figure of merit than comparable single cell filters in literature. Most noteworthy is a Rb-D2 filter which outputs >92% of light through a single peak at line centre, with maximum transmission 0.71 and a width of 330 MHz at half maximum.
description: 11 pages, 5 figures, submitted to Journal of Physics B
title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ ÑÐ¸Ð³Ð¼Ð°-1 ÑÐµÑÐµÐ¿ÑÐ¾ÑÐ° Ð½Ð° ÐºÐ¾Ð½ÑÐµÐ½ÑÑÐ°ÑÐ¸Ñ Ð¡Ð° Ð² ÑÐ½Ð´Ð¾Ð¿Ð»Ð°Ð·Ð¼Ð°ÑÐ¸ÑÐµÑÐºÐ¾Ð¼ ÑÐµÑÐ¸ÐºÑÐ»ÑÐ¼Ðµ Ð² Ð½Ð¾ÑÐ¼Ðµ Ð¸ Ð¿ÑÐ¸ Ð±Ð¾Ð»ÐµÐ·Ð½Ð¸ Ð¥Ð°Ð½ÑÐ¸Ð½Ð³ÑÐ¾Ð½Ð°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Study of the effect of sigma-1 receptor on Ca concentration in the endoplasmic reticulum in health and in Huntington's disease
Creators: name: ÐÑÐ±Ð°Ð½Ð¾Ð²Ð°, Ð¡Ð¾ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: Ð½ÐµÐ¹ÑÐ¾Ð´ÐµÐ³ÐµÐ½ÐµÑÐ°ÑÐ¸Ð²Ð½ÑÐµ Ð·Ð°Ð±Ð¾Ð»ÐµÐ²Ð°Ð½Ð¸Ñ
Ð±Ð¾Ð»ÐµÐ·Ð½Ñ Ð¥Ð°Ð½ÑÐ¸Ð½Ð³ÑÐ¾Ð½Ð°
ÑÑÐ¸Ð°ÑÑÐ¼
ÐºÐ°Ð»ÑÑÐ¸ÐµÐ²Ð°Ñ Ð³Ð¸Ð¿Ð¾ÑÐµÐ·Ð°
ÑÐ¸Ð³Ð¼Ð°-1 ÑÐµÑÐµÐ¿ÑÐ¾Ñ
neurodegenerative diseases
Huntington's disease
striatim
calcium hypothesis
sigma-1 eceptor

description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½ ÑÐ¸Ð³Ð¼Ð°-1 ÑÐµÑÐµÐ¿ÑÐ¾Ñ ÐºÐ°Ðº Ð¿Ð¾ÑÐµÐ½ÑÐ¸Ð°Ð»ÑÐ½Ð°Ñ ÑÐµÑÐ°Ð¿ÐµÐ²ÑÐ¸ÑÐµÑÐºÐ°Ñ Ð¼Ð¸ÑÐµÐ½Ñ Ð¿ÑÐ¸ Ð±Ð¾Ð»ÐµÐ·Ð½Ð¸ Ð¥Ð°Ð½ÑÐ¸Ð½Ð³ÑÐ¾Ð½Ð°, ÑÐ¿Ð¾ÑÐ¾Ð±Ð½Ð°Ñ Ð½Ð¾ÑÐ¼Ð°Ð»Ð¸Ð·Ð¾Ð²Ð°ÑÑ Ð²Ð½ÑÑÑÐ¸ÐºÐ»ÐµÑÐ¾ÑÐ½Ð¾Ðµ ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ðµ Ca2+. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¾ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ñ Ca2+ Ð² ÑÐ½Ð´Ð¾Ð¿Ð»Ð°Ð·Ð¼Ð°ÑÐ¸ÑÐµÑÐºÐ¾Ð¼ ÑÐµÑÐ¸ÐºÑÐ»ÑÐ¼Ðµ Ð½ÐµÐ¹ÑÐ¾Ð½Ð¾Ð² ÑÑÑÐ¸Ð°ÑÑÐ¼Ð° Ð¿ÑÐ¸ Ð½Ð¾ÐºÐ´Ð°ÑÐ½Ðµ Ð¸ Ð³Ð¸Ð¿ÐµÑÑÐºÑÐ¿ÑÐµÑÑÐ¸Ð¸ ÑÐ¸Ð³Ð¼Ð°-1 ÑÐµÑÐµÐ¿ÑÐ¾ÑÐ°. ÐÐ¾ÐºÐ´Ð°ÑÐ½ ÑÐ¸Ð³Ð¼Ð°-1 ÑÐµÑÐµÐ¿ÑÐ¾ÑÐ° ÑÐ½Ð¸Ð¶Ð°Ð» ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ðµ ÐºÐ°Ð»ÑÑÐ¸Ñ Ð² Ð­ÐÐ , Ð° Ð³Ð¸Ð¿ÐµÑÑÐºÑÐ¿ÑÐµÑÑÐ¸Ñ Ð½Ðµ Ð²Ð»Ð¸ÑÐ»Ð° Ð½Ð° ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ðµ Ca2+ Ð½Ð° Ð¾Ð±Ð¾Ð¸Ñ Ð¼Ð¾Ð´ÐµÐ»ÑÑ. ÐÑÐ¾Ð¼Ðµ ÑÐ¾Ð³Ð¾, Ð´Ð¾Ð±Ð°Ð²Ð»ÐµÐ½Ð¸Ðµ Ð°Ð³Ð¾Ð½Ð¸ÑÑÐ° Ð¡1Ð  PRE-084 Ð½Ð¾ÑÐ¼Ð°Ð»Ð¸Ð·Ð¾Ð²Ð°Ð»Ð¾ ÑÐ¾Ð´ÐµÑÐ¶Ð°Ð½Ð¸Ðµ Ca2+ Ð½Ð° Ð¼Ð¾Ð´ÐµÐ»Ð¸ Ð±Ð¾Ð»ÐµÐ·Ð½Ð¸. ÐÐ¾Ð»ÑÑÐµÐ½Ð½ÑÐµ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ ÑÑÐ°ÑÐ¸ÑÑÐ¸ÑÐµÑÐºÐ¸ Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð¸ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ñ Ð² Ð²Ð¸Ð´Ðµ Ð³ÑÐ°ÑÐ¸ÐºÐ¾Ð² Ð¸ ÑÑÐ¾Ð»Ð±Ð¸ÐºÐ¾Ð²ÑÑ Ð´Ð¸Ð°Ð³ÑÐ°Ð¼Ð¼.
description: In this paper, the sigma-1 receptor was considered as a potential therapeutic target in Huntington's disease, which is able to normalize the intracellular Ca2+ content. A study was conducted on the content of Ca2+ in the endoplasmic reticulum of the striatum neurons during knockdown and overexpression of the sigma-1 receptor. Knockdown of the sigma-1 receptor reduced the calcium content in EPR, and overexpression did not affect the content of Ca2+ on both models. In addition, the application of the agonist S1R PRE-084 had normalized the content of Ca2+ in the disease model. The obtained results were statistically processed and presented in the form of graphs and bar charts.
Revisiting the $DD^\ast$ chiral interactions with the local momentum-space regularization up to the third order and the nature of $T_{cc}^+$
Creators: name: Wang, Bo
name: Meng, Lu
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We revisit the $DD^\ast$ interactions in chiral effective field theory up to the third order for the first time. We deal with the pion-exchanged interactions via local momentum-space regularization, in which we focus on their long-range behaviors through demanding their contributions vanish at the origin in the coordinate space. The short-range contact interactions and subleading pion-charmed meson couplings are estimated with the phenomenological resonance saturation model. The subleading pion-charmed meson couplings are much weaker than those in the pion-nucleon system, thus the $DD^\ast$ binding mechanism is very different with that of the $NN$ system. We also obtain the analytic structure of the two-pion exchange interactions in the coordinate space, and we find that its asymptotic behavior at long distance is similar to but slightly different with the $NN$ interactions. We get the same asymptotic behavior of the two-pion exchange interaction with that from HAL QCD method but appearing in the longer distance rather than $1
description: 15 pages, 6 figures, and 2 tables
An Estimate of Λin Resummed Quantum Gravity in the Context of Asymptotic Safety
Creators: name: Ward, B. F. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that, by using recently developed exact resummation techniques based on the extension of the methods of Yennie, Frautschi and Suura to Feynman's formulation of Einstein's theory, we get quantum field theoretic descriptions for the UV fixed-point behaviors of the dimensionless gravitational and cosmological constants postulated by Weinberg. Connecting our work to the attendant phenomenological asymptotic safety analysis of Planck scale cosmology by Bonanno and Reuter, we estimate the value of the cosmological constant Λ. We find the encouraging estimate ρ_Λ\equiv \fracΛ{8πG_N} \simeq (2.4\times 10^{-3}eV)^4. While this numerical value is close to recent experimental observations, we caution the reader that the estimate involves a number of model parameters that still possess significant levels of uncertainty, such as the value of the transition time between the Planck scale cosmology era and the Friedmann-Robertson-Walker radiation dominated era, where our current understanding allows for at least two orders of magnitude in its uncertainty and this would change our estimate of ρ_Λby at least four orders of magnitude. We discuss such theoretical uncertainties as well. We show why GUT and EW scale vacuum energies from spontaneous symmetry breaking are suppressed in our approach to the estimation of ρ_Λ. As a bonus, we show how our estimate constrains susy GUTS.
description: 11 pages, 1 figure; more systematic presentation; extended text, two new figures for self-containment - now 37 pages; corrected grammar, improved references to published version. arXiv admin note: text overlap with arXiv:hep-ph/0607198
Quantum Kinetic Theory of Nonlinear Optical Currents: Finite Fermi surface and Fermi sea contributions
Creators: name: Bhalla, Pankaj
name: Das, Kamal
name: Agarwal, Amit
name: Culcer, Dimitrie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The quantum kinetic framework provides a versatile method for investigating the dynamical optical and transport currents of crystalline solids. In this paper, starting from the density-matrix equations of motion, we present a general theoretical path to obtain nonlinear optical responses elegantly and transparently. We devise a kinetic theory applicable to materials with arbitrary band structures and captures intraband and interband coherence effects, finite Fermi surfaces, and disorder effects. We present a classification of nonlinear optical currents arising from the interference of interband and intraband components of the density matrix with distinct symmetry and quantum geometrical origin for each contribution. In this context, we report four findings. (i) The Fermi Golden Rule approach is insufficient to derive the correct expression for the injection current, a shortcoming that we remedy in our theory while associating the injection current with the intraband-interband contribution to the second-order density matrix. (ii) The interband-intraband contribution yields a resonant current that survives irrespective of any symmetry constraint in addition to the well-known anomalous nonlinear current (non-resonant), which requires time-reversal symmetry. (iii) Quite generally, the nonlinear current is significantly enhanced by contributions from the finite Fermi surface. (iv) The finite Fermi surface and Fermi sea additionally lead to sizable novel nonlinear effects via contributions we term double resonant and higher-order pole. As an illustration, we compute the nonlinear response of topological antiferromagnet CuMnAs and thin film tilted Weyl semimetals dominated by interband coherence effects. We find that the nonlinear response of CuMnAs is responsive to the direction of finite magnetization field and choice of the polarization angle of the beam, while Weyl semimetal only to tilt.
description: 16 pages, 4 figures, Comments/Suggestions are welcome
The phase-shift of isospin-2 pi-pi scattering from lattice QCD
Creators: name: Dudek, Jozef J.
name: Edwards, Robert G.
name: Peardon, Michael J.
name: Richards, David G.
name: Thomas, Christopher E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Finite-volume lattice QCD calculations offer the possibility of extracting resonance parameters from the energy-dependent elastic phase-shift computed using the Luescher technique. In this letter, as a trial of the method, we report on the extraction of the non-resonant phase-shift for S and D-wave pi-pi isospin-2 scattering from dynamical lattice QCD computations. We define a variational basis of operators resembling pairs of pions of definite relative momentum and extract a spectrum of excited states that maps to phase-shifts at a set of discrete scattering momenta. Computations are performed with pion masses between 400 and 520 MeV on multiple spatial volumes. We observe no significant quark mass dependence in the phase-shifts extracted which are in reasonable agreement with the available experimental data at low momentum.
description: 5 pages, updated to reflect published version
Non-volatile Electric Control of Magnetic and Topological Properties of MnBi2Te4 Thin Films
Creators: name: Luo, Wei
name: Du, Mao-Hua
name: Reboredo, Fernando A.
name: Yoon, Mina
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this letter, we propose a mechanism to control the magnetic properties of topological quantum material (TQM) by using magnetoelectric coupling: this mechanism uses a heterostructure of TQM with two-dimensional (2D) ferroelectric material, which can dynamically control the magnetic order by changing the polarization of the ferroelectric material and induce possible topological phase transitions. This concept is demonstrated using the example of the bilayer MnBi2Te4 on ferroelectric In2Se3 or In2Te3, where the polarization direction of the 2D ferroelectrics determines the interfacial band alignment and consequently the direction of the charge transfer. This charge transfer, in turn, enhances the stability of the ferromagnetic state of MnBi2Te4 and leads to a possible topological phase transition between the quantum anomalous Hall (QAH) effect and the zero plateau QAH. Our work provides a route to dynamically alter the magnetic ordering of TQMs and could lead to the discovery of new multifunctional topological heterostructures.
description: 22 pages, 5 figures