cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Re-estimating the Spin Parameter of the Black Hole in Cygnus X-1
Creators: name: Zhao, Xueshan
name: Gou, Lijun
name: Dong, Yanting
name: Zheng, Xueying
name: Steiner, James F.
name: Miller-Jones, James C. A.
name: Bahramian, Arash
name: Orosz, Jerome A.
name: Feng, Ye
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Cygnus X-1 is a well-studied persistent black hole X-ray binary. Recently, the three parameters needed to estimate the black hole spin of this system, namely the black hole mass $M$, the orbital inclination $i$ and the source distance $D$, have been updated. In this work we redetermine the spin parameter using the continuum-fitting technique for those updated parameter values. Based on the assumption that the spin axis of the black hole is aligned with the orbital plane, we fit the thermal disk component to a fully relativistic thin accretion disk model. The error in the spin estimate arising from the combined observational uncertainties is obtained via Monte Carlo (MC) simulations. We demonstrate that, without considering the counteracting torque effect, the new spin parameter is constrained to be a$_* > 0.9985$ (3$σ$), which confirms that the spin of the black hole in Cygnus X-1 is extreme.
description: ApJ published
Blast From the Past: Constraining Progenitor Models of SN 1972E
Creators: name: Do, Aaron
name: Shappee, Benjamin J.
name: De Cuyper, Jean-Pierre
name: Tonry, John L.
name: Hunt, Cynthia
name: Schweizer, François
name: Phillips, Mark M.
name: Burns, Christopher R.
name: Beaton, Rachael
name: Hainaut, Olivier
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a novel technique to study Type Ia supernovae by constraining surviving companions of historical extragalactic SN by combining archival photographic plates and Hubble Space Telescope imaging. We demonstrate this technique for Supernova 1972E, the nearest known SN Ia in over 125 years. Some models of Type Ia supernovae describe a white dwarf with a non-degenerate companion that donates enough mass to trigger thermonuclear detonation. Hydrodynamic simulations and stellar evolution models show that these donor stars survive the explosion, and show increased luminosity for at least a thousand years. Thus, late-time observations of the exact location of a supernova after its ejecta have faded can constrain the presence of a surviving donor star and progenitor models. We find the explosion site of SN 1972E by analyzing 17 digitized photographic plates taken with the European Southern Observatory 1m Schmidt and 1 plate taken with the Cerro Tololo Inter-American Observatory 1.5m telescope from 1972-1974. Using the \textit{Gaia} eDR3 catalog to determine Supernova 1972E's equatorial coordinates yields: $α$ = 13$^h$ 39$^m$ 52.708$^s$ $\pm$ 0.004$^s$ and $δ$ = $-$31\degree 40' 8\farcs97 $\pm$ 0\farcs04 (ICRS). In 2005, HST/ACS imaged NGC 5253, the host galaxy of SN 1972E, with the $F435W$, $F555W$, and $F814W$ filters covering the explosion site. The nearest source detected is offset by 3.0 times our positional precision, and is inconsistent with the colors expected of a surviving donor star. Thus, the 2005 HST observation rules out all Helium-star companion models, and the most luminous main-sequence companion model currently in the literature. The remaining main-sequence companion models could be tested with deeper HST imaging.
description: 13 pages, 5 figures, and 2 tables in main text, plus 2 pages of appendices. Submitted to MNRAS
The Bulk Flow Velocity and Acceleration of the Inner Jet in M\,87
Creators: name: Punsly, Brian
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A high sensitivity, 7mm Very Long Baseline Array image of M\,87 is analyzed in order to estimate the jet velocity within 0.65 mas of the point of origin. The image captured a high signal to noise, double-ridged, counter-jet extending $\sim 1$ mas from the nucleus. After defining conditions and requirements that justify approximate time averaged bilateral symmetry, a continuous set of Lorentz transformations are found that map the double-ridged counter-jet intensity profile into the double-ridged jet intensity profile. The mapping is realized by a uniformly accelerating flow with intrinsic velocity of $\sim 0.27$c at 0.4 mas (a de-projected distance of 0.38 lt-yrs) to $0.38$c at 0.65 mas (a de-projected distance of 0.61 lt-yrs) from the nucleus. Since the velocity field is derived from the global surface brightness profile and does not depend on the motion of enhanced features, it is most likely a bulk flow velocity as opposed to a pattern velocity. This interpretation is corroborated by the fact that the distribution of the apparent velocities of previously identified individual features (from the literature) within 0.65 mas of the nucleus are consistent with local hydrodynamic shocks being advected with the local bulk flow velocity. The bulk flow velocity of the visible inner jet is a constraint that can potentially break degeneracies between numerical simulations that are designed to replicate both the annulus that was imaged by the Event Horizon Telescope as well as the base of the inner jet.
description: To appear in ApJ
Spectral atlas of massive stars around He I 10830 A
Creators: name: Groh, J. H.
name: Damineli, A.
name: Jablonski, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a digital atlas of peculiar, high-luminosity massive stars in the near-infrared region (10470-11000 A) at medium resolution (R~7000). The spectra are centered around He I 10830 A, which is formed in the wind of those stars, and is a crucial line to obtain their physical parameters. The instrumental configuration also sampled a rich variety of emission lines of Fe II, Mg II, C I, N I and Pa gamma. Secure identifications for most spectral lines are given, based on synthetic atmosphere models calculated by our group. We also propose that two unidentified absorption features have interstellar and/or circumstellar origin. For the strongest one (10780 A) an empirical calibration between E(B-V) and equivalent width is provided. The atlas displays the spectra of massive stars organized in four categories, namely Be stars, OBA Iape (or luminous blue variables, LBV candidates and ex/dormant LBVs), OB supergiants and Wolf-Rayet stars. For comparison, the photospheric spectra of non emission-line stars are presented. Selected LBVs were observed in different epochs from 2001 to 2004, and their spectral variability reveals that some stars, such as Eta Car, AG Car and HR Car, suffered dramatic spectroscopic changes during this time interval.
description: A&A in press, 19 pages, 19 figures
The Small World Phenomenon and Network Analysis of ICT Startup Investment in Indonesia and Singapore
Creators: name: Aslam, Farid Naufal
name: Alamsyah, Andry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: General Economics (econ.GN)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business

description: The internet's rapid growth stimulates the emergence of start-up companies based on information technology and telecommunication (ICT) in Indonesia and Singapore. As the number of start-ups and its investor growth, the network of its relationship become larger and complex, but on the other side feel small. Everyone in the ICT start-up investment network can be reached in short steps, led to a phenomenon called small-world phenomenon, a principle that we are all connected by a short chain of relationships. We investigate the pattern of the relationship between a start-up with its investor and the small world characteristics using network analysis methodology. The research is conducted by creating the ICT start-up investment network model of each country and calculate its small-world network properties to see the characteristic of the networks. Then we compare and analyze the result of each network model. The result of this research is to give knowledge about the current condition of ICT start-up investment in Indonesia and Singapore. The research is beneficial for business intelligence purposes to support decision-making related to ICT start-up investment.
description: 7 pages, 4 figures, 2 tables
Vortex dynamics in rotating counterflow and plane Couette and Poiseuille turbulence in superfluid Helium
Creators: name: Jou, David
name: Sciacca, Michele
name: Mongiovi', Maria Stella
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: An equation previously proposed to describe the evolution of vortex line density in rotating counterflow turbulent tangles in superfluid helium is generalized to incorporate nonvanishing barycentric velocity and velocity gradients. Our generalization is compared with an analogous approach proposed by Lipniacki, and with experimental results by Swanson et al. in rotating counterflow, and it is used to evaluate the vortex density in plane Couette and Poiseuille flows of superfluid helium.
description: 18 pages, 2 figures
XMM-LSS discovery of a z=1.22 galaxy cluster
Creators: name: Bremer, M. N.
name: Valtchanov, I.
name: Willis, J. P.
name: Altieri, B.
name: Andreon, S.
name: Duc, P. A
name: Fang, F.
name: Jean, C.
name: Lonsdale, C.
name: Pacaud, F.
name: Pierre, M.
name: Surace, J. A.
name: Scupe, D. L.
name: Waddington, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present details of the discovery of XLSSJ022303.0-043622, a z=1.2 cluster of galaxies. This cluster was identified from its X-ray properties and selected as a z>1 candidate from its optical/near-IR characteristics in the XMM Large-Scale Structure Survey (XMM-LSS). It is the most distant system discovered in the survey to date. We present ground-based optical and near IR observations of the system carried out as part of the XMM-LSS survey. The cluster has a bolometric X-ray luminosity of 1.1 +/- 0.7 x 10^44 erg/s, fainter than most other known z>1 X-ray selected clusters. In the optical it has a remarkably compact core, with at least a dozen galaxies inside a 125 kpc radius circle centred on the X-ray position. Most of the galaxies within the core, and those spectroscopically confirmed to be cluster members, have stellar masses similar to those of massive cluster galaxies at low redshift. They have colours comparable to those of galaxies in other z>1 clusters, consistent with showing little sign of strong ongoing star formation. The bulk of the star formation within the galaxies appears to have ceased at least 1.5 Gyr before the observed epoch. Our results are consistent with massive cluster galaxies forming at z>1 and passively evolving thereafter. We also show that the system is straightforwardly identified in Spitzer/IRAC 3.6 and 4.5 micron data obtained by the SWIRE survey emphasising the power and utility of joint XMM and Spitzer searches for the most distant clusters.
description: 8 pages, 6 figures, MNRAS accepted
A Unified Inference for Predictive Quantile Regression
Creators: name: Liu, Xiaohui
name: Long, Wei
name: Peng, Liang
name: Yang, Bingduo
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Mathematical Sciences not elsewhere classified
subject: Plant Biology

description: The asymptotic behavior of quantile regression inference becomes dramatically different when it involves a persistent predictor with zero or nonzero intercept. Distinguishing various properties of a predictor is empirically challenging. In this article, we develop a unified predictability test for quantile regression regardless of the presence of intercept and persistence of a predictor. The developed test is a novel combination of data splitting, weighted inference, and a random weighted bootstrap method. Monte Carlo simulations show that the new approach displays significantly better size and power performance than other competing methods in various scenarios, particularly when the predictive regressor contains a nonzero intercept. In an empirical application, we revisit the quantile predictability of the monthly S&P 500 returns between 1980 and 2019. Supplementary materials for this article are available online.
Portraiture, revolutionary, identity and subjucation: Anne-Louis Girodet’s citizen Belley
Creators: name: Musto, Sylvia S.
Publisher: name: University of British Columbia
Year: 2008

description: During the French Revolution, portraiture played an important role in the forging of identities for the new ruling class. In my thesis I will examine a portrait painted in 1797by Anne-Louis Girodet of Jean-Baptiste Belley, a black who held a position as deputy to the French National Assembly forth colony of Saint Domingue, between the years 1794 to 1797. Slavery was abolished in France in 1794. Girodet's portrait of Jean-Baptiste Belley has been seen by both contemporary and later critics as a celebration of the abolition of slavery, and as symbolizing the French Revolution’s ideals of liberty and equality. However, the portrait also highlights the underlying controversy which the Revolutionaries faced: how to reconcile the Declaration of the Rights of Man with the firmly stated commitment of the Revolutionary government to uphold a colonial empire. The French had declared the abolition of slavery because they needed the slaves to form an army for the defense of the colony of Saint Domingue, which was threatened by military attacks from the British and the Spanish. Hence, with the abolition of slavery, there was created a new black military ruling class in Saint Domingue. Considering the powerful position of the blacks in Saint Domingue, there were fears in France that the colony, with the support of the British, might declare its independence. With the changing status of blacks, from slaves to French if citizens and soldiers, and with the growing uncertainty about French rule in Saint Domingue, Girodet was faced with the task of creating the image of a new black citizen, and of mediating that image in terms of the anti-Jacobin, conservative mood of the Directory, and in terms of the threat embodied in the black military leaders. In Girodet's portrait, Belley is included in a French Revolutionary elite; he is represented as a reassuring, non-threatening representative of the colonies. However, Girodet also conveys Belley's position as an outsider, whose marginality and difference is epitomized in the portrait itself. I will argue in my thesis that Girodet's portrait ofBelley represents and defines a racial hierarchy which could justify the continuation of colonialism and the subordination of blacks, and I will try to show how Girodet represents this hierarchy by a subtle manipulation of the imagery, rhetoric and myth which had been used to define power during the French Revolution.
Chandra Observations of Nuclear Outflows in the Elliptical Galaxy NGC4552 in the Virgo Cluster
Creators: name: Machacek, M.
name: Nulsen, P. E. J.
name: Jones, C.
name: Forman, W. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use a 54.4 ks Chandra observation to study nuclear outflow activity in NGC4552 (M89), an elliptical galaxy in the Virgo Cluster. Chandra images in the 0.5-2 keV band show two ring-like features ~1.7 kpc in diameter in the core of NGC4552, as reported previously by Filho et al. We use spherically symmetric point explosion shock models to argue that the shape of the surface brightness profile across the rims of the rings and the temperature of hot gas in the rings are consistent with a Mach 1.7 shock carrying mean mechanical power L_shock ~ 3 x 10^{41} ergs/s produced by a ~1.4 x 10^{55} ergs nuclear outburst \~1 - 2 Myr ago. We find the gas temperature in the central ~100 pc of the galaxy to be 1.0 +/- 0.2 keV, hotter than elsewhere in the galaxy, suggesting that we may be observing directly the reheating of the galaxy ISM by the outburst.
description: second part (sec. 4) of astroph/0508588v1 with expanded intro and discussion; 16 pages, 8 figs., ApJ, submitted
Adaptive Mesh Refinement and Relativistic MHD
Creators: name: Neilsen, David
name: Hirschmann, Eric W.
name: Anderson, Matthew
name: Liebling, Steven L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We solve the general relativistic magnetohydrodynamics equations using distributed parallel adaptive mesh refinement. We discuss strong scaling tests of the code, and present evolutions of Michel accretion and a TOV star.
description: 3 Pages, Proceedings of the Marcel Grossmann Meeting XI
Asymptotically Flat Ricci Flows
Creators: name: Oliynyk, T.
name: Woolgar, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C44, 58J35, 53Z05, 58Z05

description: We study Ricci flows on $R^n$, $n\ge 3$, that evolve from asymptotically flat initial data. Under mild conditions on the initial data, we show that the flow exists and remains asymptotically flat for an interval of time. The mass is constant in time along the flow. We then specialize to the case of rotationally symmetric, asymptotically flat initial data containing no embedded minimal hyperspheres. We show that in this case the flow is immortal, remains asymptotically flat, never develops a minimal hypersphere, and converges to flat Euclidean space as the time diverges to infinity. We discuss the behaviour of quasi-local mass under the flow, and relate this to a conjecture in string theory.
description: Arxiv version contains Appendices and additional material on local (in time) existence which does not appear in the published version. This version corrects minor errors in equations 5.13 and 5.14. 47 pages
A Core of E-Commerce Customer Experience based on Conversational Data using Network Text Methodology
Creators: name: Alamsyah, Andry
name: Laksmiani, Nurlisa
name: Rahimi, Lies Anisa
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Economics (econ.GN)
subject: Computers and Society (cs.CY)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences
subject: K.4
subject: 00-XX

description: E-commerce provides an efficient and effective way to exchange goods between sellers and customers. E-commerce has been a popular method for doing business, because of its simplicity of having commerce activity transparently available, including customer voice and opinion about their own experience. Those experiences can be a great benefit to understand customer experience comprehensively, both for sellers and future customers. This paper applies to e-commerces and customers in Indonesia. Many Indonesian customers expressed their voice to open social network services such as Twitter and Facebook, where a large proportion of data is in the form of conversational data. By understanding customer behavior through open social network service, we can have descriptions about the e-commerce services level in Indonesia. Thus, it is related to the government's effort to improve the Indonesian digital economy ecosystem. A method for finding core topics in large-scale internet unstructured text data is needed, where the method should be fast but sufficiently accurate. Processing large-scale data is not a straightforward job, it often needs special skills of people and complex software and hardware computer system. We propose a fast methodology of text mining methods based on frequently appeared words and their word association to form network text methodology. This method is adapted from Social Network Analysis by the model relationships between words instead of actors.
description: 9 pages, 1 figure, 4 tables
XChronos vs. Frauchiger-Renner When Consciousness Breaks Schrödinger's Clock.pdf
Creators: name: Souza Silva, Jaconaazar
Publisher: name: Zenodo
Year: 2025
Subjects: Frauchiger-Renner
XChronos
Chronons
Hexachronons
Metachronons
subjective time
onsciousness
quantum paradox
quantum information theory
symbolic ontology
observer collapse
quantum logic

description: This article presents a symbolic-ontological interpretation of the Frauchiger-Renner thought experiment through the lens of XChronos, a phenomenological framework developed to explore subjective time and conscious observation. By aligning the logical inconsistencies exposed in the FR experiment with the symbolic collapses of Chronons, Hexachronons, and Metachronons, the study highlights the ontological necessity of consciousness as the source of temporal and existential coherence. It argues that what quantum theory calls “contradiction” is, in symbolic terms, the absence of conscious colapse—an unmeasured possibility awaiting the observer. The XChronos model therefore proposes that time is not a background container but an emergent product of attentive perception. Consciousness, far from being an afterthought in physics, is the very clock through which meaning and temporality arise.
Quantum phase transitions and dimensional reduction in antiferromagnets with inter-layer frustration
Creators: name: Rösch, Oliver
name: Vojta, Matthias
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: For magnets with a fully frustrated inter-layer interaction, we argue that the quantum phase transitions from a paramagnetic to an antiferromagnetic ground state, driven by pressure or magnetic field, are asymptotically three-dimensional, due to interaction-generated non-frustrated inter-layer couplings. However, the relevant crossover scale is tiny, such that two-dimensional behavior occurs in an experimentally relevant low-temperature regime. In the pressure-driven case the phase transition may split, in which case an Ising symmetry related to inter-layer bond order is broken before magnetism occurs. We discuss the relation of our results to recent experiments on BaCuSi2O6.
description: 4 pages, 3 figs; (v2) final version as published
Quantum transport in non-Markovian dynamically-disordered photonic lattices
Creators: name: Román-Ancheyta, Ricardo
name: Çakmak, Barış
name: León-Montiel, Roberto de J.
name: Perez-Leija, Armando
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically show that the dynamics of a driven quantum harmonic oscillator subject to non-dissipative noise is formally equivalent to the single-particle dynamics propagating through an experimentally feasible dynamically-disordered photonic network. Using this correspondence, we find that noise assisted energy transport occurs in this network and, if the noise is Markovian or delta-correlated, we can obtain an analytical solution for the maximum amount of transferred energy between all network's sites at a fixed propagation distance. Beyond the Markovian limit, we further consider two different types of non-Markovian noise and show that it is possible to have efficient energy transport for larger values of the dephasing rate.
description: 12 pages, 4 figures
The DWT Power Spectrum of the two-degree Field Galaxy Redshift Survey
Creators: name: Cai, Yan-Chuan
name: Pan, Jun
name: Zhao, Yong-Heng
name: Feng, Long-Long
name: Fang, Li-Zhi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The power spectrum of the two-degree Field Galaxy Redshift Survey (2dFGRS) sample is estimated with the discrete wavelet transform (DWT) method. The DWT power spectra within $0.04
description: 11 pages, 9 figures. submitted to MNRAS. submitted to MNRAS
Graph Sampling Approach for Reducing Computational Complexity of Large-Scale Social Network
Creators: name: Alamsyah, Andry
name: Peranginangin, Yahya
name: Muchtadi-Alamsyah, Intan
name: Rahardjo, Budi
name: Kuspriyanto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences
subject: 68-XX

description: Online social network services provide a platform for human social interactions. Nowadays, many kinds of online interactions generate large-scale social network data. Network analysis helps to mine knowledge and pattern from the relationship between actors inside the network. This approach is important to support predictions and the decision-making process in many real-world applications. The social network analysis methodology, which borrows approaches from graph theory provides several metrics that enabled us to measure specific properties of the networks. Some of the metrics calculations were built with no scalability in minds, thus it is computationally expensive. In this paper, we propose a graph sampling approach to reduce social network size, thus reducing computation operations. The performance comparison between natural graph sampling strategies using edge random sampling, node random sampling, and random walks are presented on each selected graph property. We found that the performance of graph sampling strategies depends on graph properties measured.
description: 7 pages, 2 figures
Current Status Of Velocity Field Surveys: A Consistency Check
Creators: name: Sarkar, Devdeep
name: Feldman, Hume A.
name: Watkins, Richard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an analysis comparing the bulk--flow measurements for six recent peculiar velocity surveys, namely, ENEAR, SFI, RFGC, SBF and the Mark III singles and group catalogs. We study whether the direction of the bulk--flow estimates are consistent with each other and construct the full three dimensional bulk--flow vectors for each survey. We show that although the surveys differ in their geometry, galaxy morphologies, distance measures and measurement errors, their bulk flow vectors are expected to be highly correlated and in fact show impressive agreement in all cases. We found a combined weighted mean bulk motion of 330 km s$^{-1}$ $\pm 101$ km s$^{-1}$ toward $l= 234^{\degree}\pm 11^{\degree}$ and $b=12^{\degree}\pm 9^{\degree}$ in a sphere with an effective depth of $\sim4000$ km s$^{-1}$.
description: 16 pages, 2 figures 2 tables, minor changes, reflects published version
An Intriguing Globular Cluster in the Galactic Bulge from the VVV Survey
Creators: name: Minniti, D.
name: Palma, T.
name: Camargo, D.
name: Chijani-Saballa, M.
name: Alonso-García, J.
name: Clariá, J. J.
name: Dias, B.
name: Gómez, M.
name: Pullen, J. B.
name: Saito, R. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent near-IR Surveys have discovered a number of new bulge globular cluster (GC) candidates that need to be further investigated. Our main objective is to use public data from the Gaia Mission, VVV, 2MASS and WISE in order to measure the physical parameters of Minni48, a new candidate GC located in the inner bulge of the Galaxy at l=359.35 deg, b=2.79 deg. Even though there is a bright foreground star contaminating the field, the cluster appears quite bright in near- and mid-IR images. We obtain deep decontaminated optical and near-IR colour-magnitude diagrams (CMDs) for this cluster. The heliocentric cluster distance is determined from the red clump (RC) and the red giant branch (RGB) tip magnitudes in the near-IR CMD, while the cluster metallicity is estimated from the RGB slope and the fit to theoretical isochrones. The GC size is found to be r = 6' +/- 1', while reddening and extinction values are E(J-Ks)=0.60 +/- 0.05 mag, A_G=3.23 +/- 0.10 mag, A_Ks=0.45 +/- 0.05 mag. The resulting mean Gaia proper motions are PMRA=-3.5 +/- 0.5 mas/yr, PMDEC=-6.0 +/- 0.5 mas/yr. The IR magnitude of the RC yields an accurate distance modulus estimate of (m-M)_0=14.61 mag, equivalent to a distance D=8.4 +/- 1.0 kpc. This is consistent with the optical distance estimate: (m-M)_0=14.67 mag, D=8.6 +/- 1.0 kpc, and with the RGB tip distance: (m-M)_0=14.45 mag, D=7.8 +/- 1.0 kpc. The derived metallicity is [Fe/H]=-0.20 +/- 0.30 dex. A good fit to the PARSEC stellar isochrones is obtained in all CMDs using Age = 10 +/- 2 Gyr. The total absolute magnitude of this GC is estimated to be M_Ks= -9.04 +/- 0.66 mag. Based on its position, kinematics, metallicity and age, we conclude that Minni48 is a genuine GC, similar to other well known metal-rich bulge GCs. It is located at a projected Galactocentric angular distance of 2.9 deg, equivalent to 0.4 kpc, being one of the closest GCs to the Galactic centre.
description: 12 pages, 15 figures. Abridged abstract. Accepted for publication in the Astronomy & Astrophysics
Noncommutative Geometry and Symplectic Field Theory
Creators: name: Amorim, R. G. G.
name: Fernandes, M. C. B.
name: Khanna, F. C.
name: Santana, A. E.
name: Vianna, J. D. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we study representations of the Poincare group defined over symplectic manifolds, deriving the Klein-Gordon and the Dirac equation in phase space. The formalism is associated with relativistic Wigner functions; the Noether theorem is derived in phase space and an interacting field, including a gauge field, approach is discussed.
description: To appear in Physics Letters A
Additional file 10 of Genomic architecture of endogenous ichnoviruses reveals distinct evolutionary pathways leading to virus domestication in parasitic wasps
Creators: name: Legeai, Fabrice
name: Santos, Bernardo F.
name: Robin, Stéphanie
name: Bretaudeau, Anthony
name: Dikow, Rebecca B.
name: Lemaitre, Claire
name: Jouan, Véronique
name: Ravallec, Marc
name: Drezen, Jean-Michel
name: Tagu, Denis
name: Baudat, Frédéric
name: Gyapay, Gabor
name: Zhou, Xin
name: Liu, Shanlin
name: Webb, Bruce A.
name: Brady, Seán G.
name: Volkoff, Anne-Nathalie
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 10:. DRJs analysis. Figure S3. Examples of the different types of DRJ position. a. Proviral segment with two copies of a single direct repeat (DRJ1L and DRJ1R), one at each end of the segment. b. Proviral segment with two distinct repeated sequences (DRJ1, in yellow and DRJ2, in green), each present in two copies (DRJ1L and DRJ1R, DRJ2L and DRJ2R). c. Proviral segment with two repeated sequences, each present in two or more copies. DRJ1s in yellow, DRJ2s in green, HdIV genes represented by arrows. Table S11. DNA motifs found in the direct repeated sequences flanking the IV segments inserted in wasp genomes. Analysis was performed using the DNAMINDA2 webserver ( http://bmbl.sdstate.edu/DMINDA2/annotate.php ); the input dataset was composed of 99 DRJ sequences (right junctions of HdIV and CsIV segments). A total of 89 motifs were obtained; only those whose occurrence exceed 70% of the DRJs are reported. Table S12. Result of genome search using motifs predicted with DMINDA 2.0 webserver. Occurrence rate of motifs predicted with DMINDA 2.0 webserver in DRJs and whole genome sequences. Each of the two motifs was search among the 6 bp kmers present in the whole genome (201,969,604) and in the DRJs (33,930). The significance was evaluated using a Chi2 (taking into account the ratio of these motifs / all the other motifs in the DRJS and in the genome).
Discovery of 13 New Orbital Periods for Classical Novae
Creators: name: Schaefer, Bradley E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: I report new orbital periods (P) for 13 classical novae, based on light curves from TESS, AAVSO, and other public archives. These new nova periods now constitute nearly one-seventh of all known nova periods. Five of my systems have P>1 day, which doubles the number of such systems that must have evolved companion stars. (This is simply because ground-based time series have neither the coverage nor the stability required to discover these small-amplitude long periods.) V1016 Sgr has a rare P below the period gap, and suddenly becomes useful for current debates on evolution of novae. Five of the novae (FM Cir, V399 Del, V407 Lup, YZ Ret, and V549 Vel) have the orbital modulations in the tail of the eruption after the transition phase. Soon after the transition, YZ Ret shows a unique set of aperiodic diminishing oscillations, plus YZ Ret shows two highly-significant transient periods, 1.1% and 4.5% longer than the orbital period, much like for the superhump phenomenon. I also report an optical 591.27465 second periodicity for V407 Lup, which is coherent and must be tied to the white dwarf spin period. The new orbital periods in days are 0.1883907 +- 0.0000048 for V1405 Cas, 3.4898 +- 0.0072 for FM Cir, 0.162941 +- 0.000060 for V339 Del, 3.513 +- 0.020 for V407 Lup, 1.32379 +- 0.00048 for V2109 Oph, 3.21997 +- 0.00039 for V392 Per, 0.1628714 +- 0.0000110 for V598 Pup, 0.1324539 +- 0.0000098 for YZ Ret, 0.07579635 +- 0.00000017 for V1016 Sgr, 7.101 +- 0.016 for V5583 Sgr, 0.61075 +- 0.00071 for V1534 Sco, 0.40319 +- 0.00005 for V549 Vel, and 0.146501 +- 0.000058 for NQ Vul.
description: RNAAS paper published at https://iopscience.iop.org/article/10.3847/2515-5172/ac0d5b
The Dirac Equation in Kerr-Newman-AdS Black Hole Background
Creators: name: Belgiorno, Francesco
name: Cacciatori, Sergio L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the Dirac equation on the Kerr-Newman-AdS black hole background. We first perform the variable separation for the Dirac equation and define the Hamiltonian operator $\hat H$. Then we show that for a massive Dirac field with mass $μ\geq \frac{1}{2l}$ essential selfadjointness of $\hat H$ on $C_0^{\infty} ((r_+,\infty) \times S^2)^4$ is obtained even in presence of the boundary-like behavior of infinity in an asymptotically AdS black hole background. Furthermore qualitative spectral properties of the Hamiltonian are taken into account and in agreement with the existing results concerning the case of stationary axi-symmetric asymptotically flat black holes we infer the absence of time-periodic and normalizable solutions of the Dirac equation around the black hole in the non-extremal case.
description: 27 pages, AMS style. Some misprints corrected. Improvements in sections 1,5 and 6 and in Appendix A (improved discussion of the Dirac quantization condition). References added
Lectures on Supersymmetry Breaking
Creators: name: Intriligator, Kenneth
name: Seiberg, Nathan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the subject of spontaneous supersymmetry breaking. First we consider supersymmetry breaking in a semiclassical theory. We illustrate it with several examples, demonstrating different phenomena, including metastable supersymmetry breaking. Then we give a brief review of the dynamics of supersymmetric gauge theories. Finally, we use this dynamics to present various mechanisms for dynamical supersymmetry breaking. These notes are based on lectures given by the authors in 2007, at various schools.
description: 47 pages. v2: minor corrections
MPEC 2023-Y107 : 2020 YL1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Astrophysical implications of high energy neutrino limits
Creators: name: Becker, Julia K.
name: Gross, Andreas
name: Muenich, Kirsten
name: Dreyer, Jens
name: Rhode, Wolfgang
name: Biermann, Peter L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Second generation high energy neutrino telescopes are being built to reach sensitivities of neutrino emission from galactic and extragalactic sources. Current neutrino detectors are already able to set limits which are in the range of some emission models. In particular, the Antarctic Muon And Neutrino Detection Array (AMANDA) has recently presented the so far most restrictive limit on diffuse neutrino emission (Achterberg et al. 2007). Stacking limits which apply to AGN point source classes rather than to single point sources (Achterberg et al. (IceCube Collab.) & P. L. Biermann 2006) are given as well. In this paper, the two different types of limits will be used to draw conclusions about different emission models. An interpretation of stacking limits as diffuse limits to the emission from considered point source class is presented. The limits can for instance be used to constrain the predicted correlation of EGRET-detected diffuse emission and neutrino emission. Also, the correlation between X-ray and neutrino emission is constrained. Further results for source classes like TeV blazars and FR-II galaxies are presented. Starting from the source catalogs so-far examined for the stacking method, we discuss further potential catalogs and examine the possibilities of the second generation telescopes IceCube and KM3NeT by comparing catalogs with respect to northern and southern hemisphere total flux.
description: update of neutrino flux limits
Characters of irreducible unitary representations of $U(n, n+1)$ via double lifting from $U(1)$
Creators: name: Merino, Allan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: Primary: 22E45, Secondary: 22E46, 22E30

description: In this paper, we obtained character formulas of irreducible unitary representations of $U(n, n+1)$ by using Howe's correspondence and the Cauchy--Harish-Chandra integral. The representations of $U(n, n+1)$ we are dealing with are obtained from a double lifting of a representation of $U(1)$ via the dual pairs $(U(1), U(1, 1))$ and $(U(1, 1), U(n, n+1))$.
description: 29 Pages
Solution of a Problem of Barendregt on Sensible lambda-Theories
Creators: name: Intrigila, Benedetto
name: Statman, Richard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4.1

description: H is the theory extending β-conversion by identifying all closed unsolvables. Hω is the closure of this theory under the ω-rule (and β-conversion). A long-standing conjecture of H. Barendregt states that the provable equations of Hω form Π11-complete set. Here we prove that conjecture.
description: 17 pages
High-contrast plasmonic-enhanced shallow spin defects in hexagonal boron nitride for quantum sensing
Creators: name: Gao, Xingyu
name: Jiang, Boyang
name: Allcca, Andres E. Llacsahuanga
name: Shen, Kunhong
name: Sadi, Mohammad A.
name: Solanki, Abhishek B.
name: Ju, Peng
name: Xu, Zhujing
name: Upadhyaya, Pramey
name: Chen, Yong P.
name: Bhave, Sunil A.
name: Li, Tongcang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The recently discovered spin defects in hexagonal boron nitride (hBN), a layered van der Waals material, have great potential in quantum sensing. However, the photoluminescence and the contrast of the optically detected magnetic resonance (ODMR) of hBN spin defects are relatively low so far, which limits their sensitivity. Here we report a record-high ODMR contrast of 46$\%$ at room temperature, and simultaneous enhancement of the photoluminescence of hBN spin defects by up to 17-fold by the surface plasmon of a gold-film microwave waveguide. Our results are obtained with shallow boron vacancy spin defects in hBN nanosheets created by low-energy He$^+$ ion implantation, and a gold-film microwave waveguide fabricated by photolithography. We also explore the effects of microwave and laser powers on the ODMR, and improve the sensitivity of hBN spin defects for magnetic field detection. Our results support the promising potential of hBN spin defects for nanoscale quantum sensing.
On what scale should inflationary observables be constrained?
Creators: name: Cortês, Marina
name: Liddle, Andrew R
name: Mukherjee, Pia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the choice of scale at which constraints on inflationary observables are presented. We describe an implementation of the hierarchy of inflationary consistency equations which ensures that they remain enforced on different scales, and then seek to optimize the scale for presentation of constraints on marginalized inflationary parameters from WMAP3 data. For models with spectral index running, we find a strong variation of the constraints through the range of observational scales available, and optimize by finding the scale which decorrelates constraints on the spectral index n_S and the running. This scale is k=0.017 Mpc^{-1}, and gives a reduction by a factor of more than four in the allowed parameter area in the n_S-r plane (r being the tensor-to-scalar ratio) relative to k=0.002 Mpc^{-1}. These optimized constraints are similar to those obtained in the no-running case. We also extend the analysis to a larger compilation of data, finding essentially the same conclusions.
description: 7 pages RevTeX4 with 9 figures included. v2: References added, new section added analyzing additional datasets alongside WMAP3. v3: Minor corrections to match version accepted by PRD
Hard X-ray Detector (HXD) on Board Suzaku
Creators: name: Takahashi, T.
name: Abe, K.
name: Endo, M.
name: Endo, Y.
name: Ezoe, Y.
name: Fukazawa, Y.
name: Hamaya, M.
name: Hirakuri, S.
name: Hong, S.
name: Horii, M.
name: Inoue, H.
name: Isobe, N.
name: Itoh, T.
name: Iyomoto, N.
name: Kamae, T.
name: Kasama, D.
name: Kataoka, J.
name: Kato, H.
name: Kawaharada, M.
name: Kawano, N.
name: Kawashima, K.
name: Kawasoe, S.
name: Kishishita, T.
name: Kitaguchi, T.
name: Kobayashi, Y.
name: Kokubun, M.
name: Kotoku, J.
name: Kouda, M.
name: Kubota, A.
name: Kuroda, Y.
name: Madejski, G.
name: Makishima, K.
name: Masukawa, K.
name: Matsumoto, Y.
name: Mitani, T.
name: Miyawaki, R.
name: Mizuno, T.
name: Mori, K.
name: Mori, M.
name: Murashima, M.
name: Murakami, T.
name: Nakazawa, K.
name: Niko, H.
name: Nomachi, M.
name: Okada, Y.
name: Ohno, M.
name: Oonuki, K.
name: Ota, N.
name: Ozawa, H.
name: Sato, G.
name: Shinoda, S.
name: Sugiho, M.
name: Suzuki, M.
name: Taguchi, K.
name: Takahashi, H.
name: Takahashi, I.
name: Takeda, S.
name: Tamura, K.
name: Tamura, T.
name: Tanaka, T.
name: Tanihata, C.
name: Tashiro, M.
name: Terada, Y.
name: Tominaga, S.
name: Uchiyama, Y.
name: Watanabe, S.
name: Yamaoka, K.
name: Yanagida, T.
name: Yonetoku, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Hard X-ray Detector (HXD) on board Suzaku covers a wide energy range from 10 keV to 600 keV by combination of silicon PIN diodes and GSO scintillators. The HXD is designed to achieve an extremely low in-orbit back ground based on a combination of new techniques, including the concept of well-type active shield counter. With an effective area of 142 cm^2 at 20 keV and 273 cm2 at 150 keV, the background level at the sea level reached ~1x10^{-5} cts s^{-1} cm^{-2} keV^{-1} at 30 keV for the PI N diodes, and ~2x10^{-5} cts s^{-1} cm^{-2} keV^{-1} at 100 keV, and ~7x10^{-6} cts s^{-1} cm^{-2} keV^{-1} at 200 keV for the phoswich counter. Tight active shielding of the HXD results in a large array of guard counters surrounding the main detector parts. These anti-coincidence counters, made of ~4 cm thick BGO crystals, have a large effective area for sub-MeV to MeV gamma-rays. They work as an excellent gamma-ray burst monitor with limited angular resolution (~5 degree). The on-board signal-processing system and the data transmitted to the ground are also described.
description: 35 pages, 25 figures and 4 tables; acceted for Publication of the Astronomical Society of Japan
PLL-based digitally-intensive wireless transmitter architectures employing RF Pulse-Width Modulation
Creators: name: Song, Hyejeong
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Internet of things
Pulse-Width Modulation (PWM)
RF-Pulse Width Modulation (RF-PWM)
PLL
Cartesian transmitter
Polar transmitter
Wireless
Class-D
Switching PA
CMOS power amplifier
Switched capacitor power amplifier

description: 3G and 4G wireless networks have been recently proposed for Machine to Machine (M2M) communications in order to achieve ubiquitous coverage, robust security and high reliability. The most critical design consideration in transceivers for several portable Internet of Things (IoT) wireless communication applications is often power efficiency. This poses a key design challenge in wireless transmitters for communication standards that utilize high peak-to average power ratio (PAPR) signals. In this work, two PLL-based digitally-intensive wireless transmitter architectures employing RF-Pulse Width Modulation (RF-PWM) are presented, in order to address the efficiency challenge. The first architecture employs envelope and phase information, while the second utilizes quadrature I-Q signal components directly. A key contribution of this work is the use of analog-domain Pulse-Width Modulation (PWM) that can directly generate the output signals at the desired RF band without the need for frequency up-conversion and without degradation caused by quantization. By employing Class-D output stages, the proposed architectures can provide enhanced efficiency and allow for the use of broadband loads. These approaches make the designs suitable for multi-band and multi-mode operation. Furthermore, the digitally-intensive architectures can benefit from technology scaling. A prototype RF-PWM transmitter with a Class-D power amplifier (PA) which utilizes a polar approach is implemented in a 65-nm CMOS technology. For an LTE signal with a 1.4 MHz bandwidth and a 6.4 dB peak-to-average- power ratio (PAPR), the RF-PWM transmitter achieves a power-added efficiency (PAE) of 17.5% and an adjacent channel leakage ratio (ACLR) of -30.9 dBc and -31.1 dBc at an average output power of 16.1 dBm. The proposed transmitter achieves a peak output power of 22.4 dBm with 46.6% PAE and 38.8% efficiency for the full RF-PWM transmitter, including PAs.