cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fususella undefined-b
Creators: name: Margerel, Jean-Pierre
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Foraminifera
Nodosariata
Nodosariida
Lagenidae
Fususella
Fususella undefined-B

description: Fususella sp. B
(Fig. 7 I-K)
LOCALITY. — Saint-Sulpice-des-Landes (Loire-Atlantique).
MATERIAL EXAMINED. — Sample: SSL S3, 2.30 m (MNHN.F.F67629). AGE. — Early Pliocene.
DESCRIPTION
Test fusiform, inflated in the lower part, oral end covered with ribs; wall finely perforate; aperture rounded; aboral opening.
description: Published as part of Margerel, Jean-Pierre, 2023, The species of Lageninae Brady, 1881 (Foraminifera) from the Pliocene-Early Pleistocene of north-western France, Fécamp (Seine-Maritime, France) and St Erth (Cornwall, United Kingdom), pp. 1-53 in Geodiversitas 45 (1) on page 10, DOI: 10.5252/geodiversitas2023v45a1, http://zenodo.org/record/7693425
Sonnenfleckenzeichnung Nr. 19413.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 09.09.1956, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung, unnummeriert.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 23.09.1956, erstellt von André Koeckelenbergh, Observatoire Royal de Belgique in Uccle
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt als Zeichnung nach eigener Vorlage in Uccle.
Instrument: Merz-Grubb Refraktor Teleskop (Öffnung 160 mm, f = 2450 mm, projiziertes Sonnenbild D = 25 cm)
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 22.11.1956, erstellt von Adnan Kiral an der Universitätssternwarte Istanbul
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage am Istanbul Universitesi Observatuari, Beyazit (Istanbul). Instrument: Zeiss Refraktor Teleskop (Öffnung 130 mm, f = 2000 mm, projiziertes Sonnenbild D = 25 cm)
Sonnenfleckenzeichnung, unnummeriert.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 26.11.1956, erstellt am Sonnenobservatorium Kanzelhöhe, Kärnten
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage im Sonnenobservatorium Kanzelhöhe in Sattendorf, Österreich.  Später wurden ergänzende Angaben aufgrund weiterer Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Instrument: Heliostat mit Refraktor Eigenbau (Öffnung 110mm, f = 1650mm, projiziertes Sonnenbild D = 25cm)
Topological States in Chevrel Phase Materials from First-principle Calculations
Creators: name: Zhang, Shuai
name: Peng, Shiyu
name: Dai, Xi
name: Weng, Hongming
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Chevrel phase materials form a family of ternary molybdenum chalcogenides with a general chemical formula $A_x{\rm Mo}_6X_8$ ($A$ = metal elements, $X$ = chalcogen). The variety of $A$ atoms makes a large number of family members and leads to many tunable physical properties, such as the superconductivity, thermoelectricity and the ionic conductivity. In this work, we have further found various nontrivial band topological states in these materials by using first-principle calculations. The compounds having time-reversal symmetry, such as ${\rm BaMo}_6{\rm S}_8$, ${\rm SrMo}_6{\rm S}_8$, and ${\rm Mo}_6{\rm S}_8$, are topological insulators in both of the $R\bar{3}$ and $P\bar{1}$ phases, whereas ${\rm EuMo}_6{\rm S}_8$ within ferromagnetic state, it is an axion insulator in the $R\bar{3}$ phase and a trivial one in the $P\bar{1}$ phase. This indicates that the change of $A$ ions can modify the chemical potential, lattice distortion, and magnetic orders, which offers a unique way to influence the topological states and other properties. We hope this work can stimulate further studies of Chevrel phase materials to find more intriguing phenomena, such as topological superconducting states and Majorana modes.
Hyalinonetrionella sidebottomi Margerel 2023, n. gen., n. sp.
Creators: name: Margerel, Jean-Pierre
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Foraminifera
Nodosariata
Nodosariida
Lagenidae
Hyalinonetrionella
Hyalinonetrionella sidebottomi

description: Hyalinonetrionella sidebottomi n. gen., n. sp. (Figs 9 C-M; 30M, N)
urn:lsid:zoobank.org:act: B10AA123-6C4B-4E87-89B1-F7103F94AE96
Lagena semistriata – Sidebottom 1904: 3, pl. 1, fig. 5 (non fig. 4).
Lagena laevis forma laevis – Buchner 1940: 416, pl. 3, figs 34, 35 (non fig. 36).
HOLOTYPE. — Sample: LRK2, 2.20 m (MNHN.F.F67638).
PARATYPE. — Sample: LRK2, 2.20 m (MNHN.F.F67639).
DIAGNOSIS. — Test fusiform, basal part rounded, aperture rounded with a distinct lip, aboral opening.
TYPE AGE. — Upper Pliocene.
TYPE LOCALITY. — Brest-LRK2 (Finistère).
ETYMOLOGY. — In honour of Henry Sidebottom.
OTHER MATERIAL EXAMINED. — Sample: LRK2, 2.20 m (MNHN.F.F67740), 1 specimen.
SIZE. — Length = 0.375 mm; diameter = 0.114 mm.
OCCURENCE. — Marls from Brest-LRK2.
DESCRIPTION
Test fusiform, inflated; aboral end ornamented with spines; oral aperture with everted lip: wall hyaline, smooth, perforate; aperture rounded; aboral end structure.
description: Published as part of Margerel, Jean-Pierre, 2023, The species of Lageninae Brady, 1881 (Foraminifera) from the Pliocene-Early Pleistocene of north-western France, Fécamp (Seine-Maritime, France) and St Erth (Cornwall, United Kingdom), pp. 1-53 in Geodiversitas 45 (1) on page 16, DOI: 10.5252/geodiversitas2023v45a1, http://zenodo.org/record/7693425
Philosophy and Public Policy Quarterly, Vol 29, No 3/4 (2009)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2009

description: Constitutional Rights for Nonresident Aliens...2-7
The Harms of Homeschooling...7-12
Insider Trading: A Moral Problem...12-16
What Is Charity?...16-20
Regulatory Review and Cost-Benefit Analysis...21-26
Is There a Moral Obligation to Limit Family Size?...26-31
Nonequilibrium dynamics of the localization-delocalization transition in the non-Hermitian Aubry-André model
Creators: name: Zhai, Liang-Jun
name: Huang, Guang-Yao
name: Yin, Shuai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this paper, we investigate the driven dynamics of the localization transition in the non-Hermitian Aubry-André model with the periodic boundary condition. Depending on the strength of the quasi-periodic potential $λ$, this model undergoes a localization-delocalization phase transition. We find that the localization length $ξ$ satisfies $ξ\sim \varepsilon^{-ν}$ with $\varepsilon$ being the distance from the critical point and $ν=1$ being a universal critical exponent independent of the non-Hermitian parameter. In addition, from the finite-size scaling of the energy gap between the ground state and the first excited state, we determine the dynamic exponent $z$ as $z=2$. The critical exponent of the inverse participation ratio (IPR) for the $n$th eigenstate is also determined as $s=0.1197$. By changing $\varepsilon$ linearly to cross the critical point, we find that the driven dynamics can be described by the Kibble-Zurek scaling (KZS). Moreover, we show that the KZS with the same set of the exponents can be generalized to the localization phase transitions in the excited states.
Sonnenfleckenzeichnung Nr. 19486.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 28.12.1956, erstellt von Adolf Lemans
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Philosophy and Public Policy Quarterly, Vol 30, No 1/2 (2010)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2010

description: Google and the Cyber Infiltration...13-17
The Conscience of a Prosecutor...8-13
A Different Way of Thinking about the Two-State Solution...2-7
Philosophers to the Rescue? The Failed Attempt to Defend the Inclusion of Intelligent Design in Public Schools...18-23
Optimal dividends for a two-dimensional risk model with simultaneous ruin of both branches
Creators: name: Strietzel, Philipp Lukas
name: Heinrich, Henriette Elisabeth
Publisher: name: arXiv
Year: 2022
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G51

description: We consider the optimal dividend problem in the so-called degenerate bivariate risk model under the assumption that the surplus of one branch may become negative. More specific, we solve the stochastic control problem of maximizing discounted dividends until simultaneous ruin of both branches of an insurance company by showing that the optimal value function satisfies a certain Hamilton-Jacobi-Bellman (HJB) equation. Further, we prove that the optimal value function is the smallest viscosity solution of said HJB equation, satisfying certain growth conditions. Under some additional assumptions, we show that the optimal strategy lies within a certain subclass of all admissible strategies and reduce the two-dimensional control problem to a one-dimensional one. The results are illustrated by a numerical example and Monte-Carlo simulated value functions.
description: 25 pages, 3 figures
Sonnenfleckenzeichnung Nr. 19443.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 14.10.1956, erstellt von Adolf Lemans
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Supplementary Materials Associated with paper "Orchistoma _______ sp. nov. (Cnidaria: Hydrozoa: Leptothecata: Orchistomatidae), a new species of hydromedusa with the first discovery of the genus Orchistoma from the Northwest pacific (Tanabe Bay, Wakayama Prefecture, Japan)" by Sugimoto R, Collins AG & T Izumi.
Creators: name: Sugimoto, Ryoya
Publisher: name: Zenodo
Year: 2024

description: This is a repository for Images and videos that are associated with the paper "Orchistoma _______ sp. nov. (Cnidaria: Hydrozoa: Leptothecata: Orchistomatidae), a new species of hydromedusa with the first discovery of the genus Orchistoma from the Northwest pacific (Tanabe Bay, Wakayama Prefecture, Japan)" by Sugimoto R, Collins AG & T Izumi.
Philosophy and Public Policy Quarterly, Vol 30, No 3/4 (2010)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2010

description: Targeting Civilian Infrastructure with Smart Bombs: The New Permissiveness...2-8
The Poverty of Economic Reasoning about Climate Change...8-15
Is “Human Being” a Moral Concept?...16-20
The Philosophical Foundations of Civic Education...21-27
Philosophy and Public Policy Quarterly, Vol 31, No 1 (2013)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2013

description: The Woman Who Fell in Love with the Man Who Thought the World Was Flat...2-12
Are Negatives Positive?...13-18
Religion and the Public University...19-27
An Equity Hurdle in International Climate Negotiations...28-35
Front Cover...1
Call for Papers...36
Back Cover...37
Full Issue, Spring 2013 (reduced file size)...1-37
Philosophy and Public Policy Quarterly, Vol 31, No 2 (2013)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2013

description: Well-being and Prudential Value...10-17
Happy Now? Well-being and Cultural Policy...18-26
On Capability and the Good Life: Theoretical Debates and their Practical Implications...35-42
Well-being as a Primary Good:  Towards Legitimate Well-being Policy...2-9
The Applicability of the Self-fulfillment Account of Welfare to Nonhuman Animals, Babies, and Mentally Disabled Humans...27-34
Front Cover...1
Call for Papers...43
Back Cover...44
Full Issue...1-44
Philosophy and Public Policy Quarterly, Vol 31, No 3/4 (2013)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2014

description: The Fall/Winter 2013 issue of Philosophy and Public Policy Quarterlyshowcases articles that explore the normative and conceptual dimensions of economic inequality, the free market, peacekeeping, and the future of genome research.
description: Ending Global Poverty: Gain Without Much Pain...11-18
Markets, Free Trade, and Religion...19-26
Front Cover...1
On the Morality of Peacekeeping Among Active Civilians...2-10
ELSI and the Philosophy of Science...27-35
Back Cover...36
Philosophy & Public Policy Quarterly Volume 31, Numbers 3-4 (Fall/Winter 2013)...1-36
Quantum chaos in supersymmetric quantum mechanics: an exact diagonalization study
Creators: name: Buividovich, P. V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We use exact diagonalization to study energy level statistics and out-of-time-order correlators (OTOCs) for the simplest supersymmetric extension $\hat{H}_S = \hat{H}_B \otimes I + \hat{x}_1 \otimes σ_1 + \hat{x}_2 \otimes σ_3$ of the bosonic Hamiltonian $\hat{H}_B = \hat{p}_1^2 + \hat{p}_2^2 + \hat{x}_1^2 \, \hat{x}_2^2$. For a long time, this bosonic Hamiltonian was considered one of the simplest systems which exhibit dynamical chaos both classically and quantum-mechanically. Its structure closely resembles that of spatially compactified pure Yang-Mills theory. Correspondingly, the structure of our supersymmetric Hamiltonian is similar to that of spatially compactified supersymmetric Yang-Mills theory, also known as the BFSS model. We present numerical evidence that a continuous energy spectrum of the supersymmetric model leads to monotonous growth of OTOCs down to the lowest temperatures, which is also expected for the BFSS model from holographic duality. This growth is saturated by low-energy eigenstates with effectively one-dimensional wave functions and a completely non-chaotic energy level distribution. We observe a sharp boundary separating these low-energy states from the bulk of chaotic high-energy states. Our data suggests, although with a limited confidence, that at low temperatures the OTOC growth might be exponential over a finite range of time, with the corresponding Lyapunov exponent scaling linearly with temperature. In contrast, the gapped low-energy spectrum of the bosonic Hamiltonian leads to oscillating OTOCs at low temperatures without any signatures of exponential growth. We also find that the OTOCs for the bosonic Hamiltonian are never sufficiently close to the classical Lyapunov distance. On the other hand, the OTOCs for the supersymmetric system agree with the classical limit reasonably well over a finite range of temperatures and evolution times.
description: 25 pages, 13 figures, RevTeX4; v2: version accepted for publication in Phys. Rev. D
Philosophy and Public Policy Quarterly, Vol 32, No 2 (2014)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2014

description: This special issue of Philosophy and Public Policy Quarterly explores normative and conceptual dimensions of the international climate negotiations.
description: Introduction: Normative and Conceptual Dimensions of the International Climate Negotiations...2-3
The Problem with Consensus in the U.N. Framework Convention on Climate Change...14-21
Risk-Sharing: A Normative Framework for International Climate Negotiations...4-13
Back Cover...32
The Responsible Path between Scylla and Charybdis: Making Sense of Appeals to Equity in Climate Change Loss and Damage Mechanisms...22-30
Front Cover...1
Full Issue...1-32
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 27.09.1956, erstellt am Sonnenobservatorium Kanzelhöhe, Kärnten
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage im Sonnenobservatorium Kanzelhöhe in Sattendorf, Österreich. Instrument: Heliostat mit Refraktor Eigenbau (Öffnung 110mm, f = 1650mm, projiziertes Sonnenbild D = 25cm)
Philosophy and Public Policy Quarterly, Vol 32, No 3/4 (2014)
Creators: name: University, George Mason
Publisher: name: George Mason University
Year: 2015

description: Political Leadership and the Social Value of Privacy...2-8
Libertarianism and Pollution...9-21
Some Scalar Issues in Climate Ethics...22-28
Defining Scientific Integrity...29-35
Front Cover
Back Cover
Full Issue
Instability of hairy black holes in regularized 4-dimensional Einstein-Gauss-Bonnet gravity
Creators: name: Tsujikawa, Shinji
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In regularized 4-dimensional Einstein-Gauss-Bonnet (EGB) gravity derived from a Kaluza-Klein reduction of higher-dimensional EGB theory, we study the existence and stability of black hole (BH) solutions on a static and spherically symmetric background. We show that asymptotically-flat hairy BH solutions realized for a spatially-flat maximally symmetric internal space are unstable against linear perturbations for any rescaled GB coupling constant. This instability is present for the angular propagation of even-parity perturbations both in the vicinity of an event horizon and at spatial infinity. There is also a strong coupling problem associated with the kinetic term of even-parity perturbations vanishing everywhere.
description: 16 pages, no figures
Sonnenfleckenzeichnung Nr. 19478.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 15.12.1956, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Demonstration of a superconducting diode-with-memory, operational at zero magnetic field with switchable nonreciprocity
Creators: name: Golod, T.
name: Krasnov, V. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Diode is one of basic electronic components. It has a nonreciprocal current response, associated with a broken space/time reversal symmetry. Here we demonstrate prototypes of superconducting diodes operational at zero magnetic field. They are based on conventional niobium planar Josephson junctions, in which space/time symmetry is broken by a combination of self-field effect from nonuniform bias and stray fields from a trapped Abrikosov vortex. We demonstrate that nonreciprocity of critical current in such diodes can reach an order of magnitude and rectification efficiency can exceed 70$\%$. Furthermore, we can easily change the diode polarity and switch nonreciprocity on/off by changing bias configuration and by trapping/removing a vortex. This facilitates memory functionality. We argue that such diode-with-memory can be used for a future generation of in-memory superconducting computers.
description: 8 pages, 5 figures
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.11.1956, erstellt von M. Lopez Arroyo an der Sternwarte Madrid
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Zeichnung mit Tinte, erstellt auf einem eigenen Vordruck in Madrid. Instrument: Grubb Refraktor Teleskop (Öffnung: 20 cm, f = 3 m, projiziertes Sonnenbild D = 25 cm).
Instrumentennachweis gemäss Aparicio (u.a.): Sunspot, in: Solar Physics, Vol. 289, S. 4335-49, DOI: 10.1007/s11207-014-0567-x
THE RELEVANCE OF THE SEARCH FOR HEPATOPROTECTORS AND HEPATOPROTECTORS WITH HIGH ACTIVITY USED IN THE TREATMENT OF HEPATITIS CAUSED BY DRUGS
Creators: name: Rashidov, Sokhib
name: Pardaeva, Nodira
name: Quchqorova, Gulzoda
name: Rakhmatullaeva, Sevara
name: Rakhmonqulov, Alferid
Publisher: name: Zenodo
Year: 2025

description: Acute or chronic liver damage brought on by medicines or natural chemicals is known as drug-induced hepatotoxicity. The appearance is comparable to numerous hepatobiliary illnesses, making diagnosis challenging. The elimination of the offending agent and careful observation for resolution constitute the main treatment. The pathophysiology, assessment, and management of drug-induced hepatotoxicity are explained in this activity. It also discusses how the interprofessional team might help patients receive better care. Based on experimental validation, natural bioactive components generated from plant secondary metabolites have been pronounced as valuable options for predicting and mitigating hepatotoxic effects and their chronic consequences.
Sonnenfleckenzeichnung Nr. 19475.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.12.1956, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung Nr. 20775.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.06.1961, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1961

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.09.1956, erstellt von Metin Hotinli an der Universitätssternwarte Istanbul
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage am Istanbul Universitesi Observatuari, Beyazit (Istanbul). Instrument: Zeiss Refraktor Teleskop (Öffnung 130 mm, f = 2000 mm, projiziertes Sonnenbild D = 25 cm)
The Gamma-Ray Emission from the Supernova Remnant RX J1713.7-3946 Interacting with Two-phase Medium
Creators: name: Fujita, Yutaka
name: Yamazaki, Ryo
name: Ohira, Yutaka
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the origin of gamma rays from the supernova remnant (SNR) RX J1713.7-3946. Using an analytical model, we calculate the distribution of cosmic rays (CRs) around the SNRs. Motivated by the results of previous studies, we assume that the SNR is interacting with two-phase interstellar medium (ISM), where dense clumps are surrounded by tenuous interclump medium. We also assume that only higher-energy protons (~> TeV) can penetrate the dense clumps. We find that pi^0-decay gamma rays produced by protons reproduce the observed gamma-ray spectrum peaked at ~TeV. On the other hand, it has recently been indicated that the observed ISM column density (N_p), the X-ray surface brightness (I_X), and the gamma-ray surface brightness (I_g) at grid points across the SNR form a plane in the three-dimensional (3D) space of (N_p, I_X, I_g). We find that the planar configuration is naturally reproduced if the ISM or the CR electron-to-proton ratio is not spherically uniform. We show that the shift of the observed data in the 3D space could be used to identify which of the quantities, the ISM density, the CR electron-to-proton ratio, or the magnetic field, varies in the azimuthal direction of the SNR.
description: matched the published version
Sonnenfleckenzeichnung Nr. 19465.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 16.11.1956, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.11.1956, erstellt von Kamuran Avcioglu an der Universitätssternwarte Istanbul
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage am Istanbul Universitesi Observatuari, Beyazit (Istanbul). Später wurden ergänzende Angaben aufgrund weiterer Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Instrument: Zeiss Refraktor Teleskop (Öffnung 130 mm, f = 2000 mm, projiziertes Sonnenbild D = 25 cm)
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 02.11.1956, erstellt von Wolfgang Gleissberg an der Universitätssternwarte Istanbul
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage am Istanbul Universitesi Observatuari, Beyazit (Istanbul). Instrument: Zeiss Refraktor Teleskop (Öffnung 130 mm, f = 2000 mm, projiziertes Sonnenbild D = 25 cm)
Quantum Thermodynamic Uncertainties in Nonequilibrium Systems from Robertson-Schrödinger Relations
Creators: name: Dong, Hang
name: Reiche, Daniel
name: Hsiang, Jen-Tsung
name: Hu, Bei-Lok
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Thermodynamic uncertainty principles make up one of the few rare anchors in the largely uncharted waters of nonequilibrium systems, the fluctuation theorems being the more familiar. In this work we aim to trace the uncertainties of thermodynamic quantities in nonequilibrium systems to their quantum origins, namely, to the quantum uncertainty principles. Our results enable us to make this categorical statement: For Gaussian systems, thermodynamic functions are functionals of the Robertson-Schrodinger uncertainty function, which is always non-negative for quantum systems, but not necessarily so for classical systems. Here, quantum refers to noncommutativity of the canonical operator pairs. From the nonequilibrium free energy[1], we succeeded in deriving several inequalities between certain thermodynamic quantities. They assume the same forms as those in conventional thermodynamics, but these are nonequilibrium in nature and they hold for all times and at strong coupling. In addition we show that a fluctuation-dissipation inequality exists at all times in the nonequilibrium dynamics of the system. For nonequilibrium systems which relax to an equilibrium state at late times, this fluctuation-dissipation inequality leads to the Robertson-Schrodinger uncertainty principle with the help of the Cauchy-Schwarz inequality. This work provides the microscopic quantum basis to certain important thermodynamic properties of macroscopic nonequilibrium systems.
description: 37 pages, 5 figures
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 08.12.1956, erstellt am Sonnenobservatorium Kanzelhöhe, Kärnten
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage im Sonnenobservatorium Kanzelhöhe in Sattendorf, Österreich. Instrument: Heliostat mit Refraktor Eigenbau (Öffnung 110mm, f = 1650mm, projiziertes Sonnenbild D = 25cm)
Towards efficient structure prediction and pre-compensation in multi-photon lithography
Creators: name: Lang, Nicolas
name: Enns, Sven
name: Hering, Julian
name: von Freymann, Georg
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Microscale 3D printing technologies have been of increasing interest in industry and research for several years. Unfortunately, the fabricated structures always deviate from the respective expectations, often caused by the physico-chemical properties during and after the printing process. Here, we show first steps towards a simple, fast and easy to implement algorithm to predict the final structure topography for multi-photon lithography - also known as Direct Laser Writing (DLW). The three main steps of DLW, (i) exposure of a photo resin, (ii) cross-linking of the resin, and (iii) subsequent shrinkage are approximated by mathematical operations, showing promising results in coincidence with experimental observations. E.g., the root-mean-square error (rmse) between the unmodified 3D print of a radial-symmetrically chirped topography and our predicted topography is only 0.46 $μ$m, whereas the rmse between this 3D print and its target is 1.49 $μ$m. Thus, our robust predictions can be used prior to the printing process to minimize undesired deviations between the target structure and the final 3D printed structure. Using a Downhill-Simplex algorithm for identifying the optimal prediction parameters, we were able to reduce the rmse from 4.04 $μ$m to 0.33 $μ$m by only two correction loops in our best-case scenario (rmse = 0.72 $μ$m after one loop). Consequently, this approach can eliminate the need for many structural optimization loops to produce highly conformal and high quality micro structures in the future.
Sonnenfleckenzeichnung Nr. 19444.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 16.10.1956, erstellt von Helmut Müller und Adolf Lemans
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung Nr. 19422.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 20.09.1956, erstellt von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung Nr. 19432.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 01.10.1956, erstellt von Rolf Schmid
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Semi-vortices and cluster-vorticity: new concepts in the Berezinskii-Kosterlitz-Thouless phase transition
Creators: name: Bravo, Brandon Gómez
name: Hernández, Bryan D. Juárez
name: Bietenholz, Wolfgang
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The Berezinskii-Kosterlitz-Thouless (BKT) essential phase transition in the 2d XY model is revisited. Its mechanism is usually described by the (un)binding of vortex--anti-vortex (V--AV) pairs, which does, however, not provide a clear-cut quantitative criterion for criticality. Known sharp criteria are the divergence of the correlation length and a discontinuity of the helicity modulus. Here we propose and probe a new criterion: it is based on the concepts of semi-vortices and cluster vorticity, which are formulated in the framework of the multi-cluster algorithm that we use to simulate the 2d XY model.
description: 6 pages, LaTex, 7 figures, presented at the "XXXV Reuni\'{o}n Anual de la Divisi\'{o}n de Part\'{i}culas y Campos", of the "Socieded Mexicana de F\'{i}sica", 2 references added
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 20.11.1956, erstellt von M. Lopez Arroyo an der Sternwarte Madrid
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Zeichnung mit Tinte, erstellt auf einem eigenen Vordruck in Madrid. Instrument: Grubb Refraktor Teleskop (Öffnung: 20 cm, f = 3 m, projiziertes Sonnenbild D = 25 cm).
Instrumentennachweis gemäss Aparicio (u.a.): Sunspot, in: Solar Physics, Vol. 289, S. 4335-49, DOI: 10.1007/s11207-014-0567-x
Sonnenfleckenzeichnung, unnummeriert.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 04.10.1956, erstellt von André Koeckelenbergh, Observatoire Royal de Belgique in Uccle
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt als Zeichnung nach eigener Vorlage in Uccle.
Instrument: Merz-Grubb Refraktor Teleskop (Öffnung 160 mm, f = 2450 mm, projiziertes Sonnenbild D = 25 cm)
Sonnenfleckenzeichnung Nr. 19434.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 04.10.1956, erstellt von Rolf Schmid
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung, unnummeriert.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 13.12.1956, erstellt am Sonnenobservatorium Kanzelhöhe, Kärnten
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage im Sonnenobservatorium Kanzelhöhe in Sattendorf, Österreich. Instrument: Heliostat mit Refraktor Eigenbau (Öffnung 110mm, f = 1650mm, projiziertes Sonnenbild D = 25cm)
Stationary states in two lane traffic: insights from kinetic theory
Creators: name: Ramana, A. Sai Venkata
name: Jabari, Saif Eddin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Kinetics of dilute heterogeneous traffic on a two lane road is formulated in the framework of the Ben-Naim Krapivsky model and stationary state properties are analytically derived in the asymptotic limit. The heterogeneity is introduced as a quenched disorder in desired speeds of vehicles. The model assumes that each vehicle/platoon in a lane moves ballistically until it approaches a slow moving vehicle/platoon and then joins it. Vehicles in a platoon are assumed to escape the platoon at a constant rate by changing lanes. Each lane is assumed to have a different escape rate. As the stationary state is approached, the platoon density in the two lanes become equal, whereas the vehicle densities and fluxes are higher in the lane with lower escape rate. A majority of the vehicles enjoy a free-flow if the harmonic mean of the escape rates of the lanes is comparable to average initial flux on the road. The average platoon size is close to unity in the free-flow regime. If the harmonic mean is lower than the average initial flux, then vehicles with desired speeds lower than a characteristic speed $v^*$ still enjoy free-flow while those vehicles with desired speeds that are greater than $v^*$ experience congestion and form platoons behind the slower vehicles. The characteristic speed depends on the mean of escape times $(R=(R_1+R_{-1})/2)$ of the two lanes (represented by 1 and -1) as $v^* \sim R^{-\frac{1}{μ+2}}$, where $μ$ is the exponent of the quenched disorder distribution for desired speed in the small speed limit. The average platoon size in a lane, when $v^* \ll 1$, is proportional to $R^{\frac{μ+1}{μ+2}}$ plus a lane dependent correction. Equations for the kinetics of platoon size distribution for two-lane traffic are also studied. It is shown that a stationary state with platoons as large as road length can occur only if the mean escape rate is independent of platoon size.
Sonnenfleckenzeichnung Nr. 19480.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 17.12.1956, erstellt als erste Tagesaufnahme um 9 h 00 MEZ von Helmut Müller
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Evaluating the Effects of Future Land use/Land cover and Agricultural Conservation Practices Scenarios on Streamflow and Water Quality in the Maumee River Watershed
Creators: name: Zhao, Yilun
Publisher: name: My University
Year: 2024
Subjects: LULC
ACP
water quality
streamflow

description: Lake Erie's water environment has been a growing concern due to its severe water eutrophication problems which primarily caused by the accumulation of nutrients, particularly phosphorus, from both point and nonpoint source pollutants originating from the Maumee River Watershed (MRW). Despite global studies on the watershed's nutrient dynamics, the complex interactions between land use and land cover (LULC), agricultural conservation practices (ACPs), and their effects on the water environment remain inadequately understood within the MRW. In our study, we designed seven future scenarios involving LULC and ACPs to explore their impacts on the MRW. We employed the Land Change Modeler (LCM) and SWAT+ (Soil and Water Assessment Tool_Plus) to simulate future scenarios of LULC changes and to model the hydrological conditions of the watershed from 2046 to 2065, respectively. ACPs were set up in SWAT+, and we also incorporated meteorological data under the RCP8.5 scenario as future climatic conditions. We selected four hydrological parameters—streamflow (Q), Total Suspended Solids (TSS), Soluble Reactive Phosphorus (SRP), and Total Phosphorus (TP)—to analyze the impacts of various LULC and ACP scenarios on MRW. Our research found that ACP scenarios have a more significant impact on MRW's streamflow and water quality, but the effects of LULC changes are also non-negligible. We further analyzed the impacts of different LULC scenarios on the MRW's water environment in greater depth, both temporally and spatially, and found that different LULCs have more pronounced effects at the spatial scale. Although different LULC scenarios can mitigate impacts to varying degrees in different areas, our study also identified that the most significant LULC types on the water environment are open spaces and agricultural lands. Therefore, we suggest that the ideal future development model for MRW should involve managing open spaces reasonably and reducing fertilizer input in agricultural lands, while moderately increasing the proportion of open spaces and medium to high-intensity urban land in urbanized areas and reducing the area of agricultural land in the watershed. This model would effectively improve MRW's streamflow and water quality while accommodating agricultural, economic, and population growth needs.
Sonnenfleckenzeichnung Nr. 19431.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 30.09.1956, erstellt von Rolf Schmid
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Farbstift überschrieben, erstellt als Projektionsbildzeichnung in der Eidgenössischen Sternwarte Zürich. Instrument: Kern-Merz-Refraktor.
Die Beobachtungen zu Einzelflecken und zu Sonnenfleckengruppen wurden mit Bleistift auf einem Vordruck eingetragen. Später wurden ergänzende Angaben aufgrund auswärtiger Beobachtungen direkt auf der Fleckenzeichnung hinzugefügt. Unter Umständen sind Angaben zu Protuberanzen vermerkt
Sonnenfleckenzeichnung unnummeriert, einen Zürcher Lückentag ergänzend.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 05.11.1956, erstellt von Kamuran Avcioglu an der Universitätssternwarte Istanbul
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1956

description: Bleistiftzeichnung mit Tinte und Bleistift, erstellt als Zeichnung nach eigener Vorlage am Istanbul Universitesi Observatuari, Beyazit (Istanbul). Instrument: Zeiss Refraktor Teleskop (Öffnung 130 mm, f = 2000 mm, projiziertes Sonnenbild D = 25 cm)
Femtosecond photoelectron circular dichroism of chemical reactions
Creators: name: Svoboda, Vít
name: Ram, Niraghatam Bhargava
name: Baykusheva, Denitsa
name: Zindel, Daniel
name: Waters, Max D. J.
name: Spenger, Benjamin
name: Ochsner, Manuel
name: Herburger, Holger
name: Stohner, Jürgen
name: Wörner, Hans Jakob
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Understanding the chirality of molecular reaction pathways is essential for a broad range of fundamental and applied sciences. However, the current ability to probe chirality on the time scale of chemical reactions remains very limited. Here, we demonstrate time-resolved photoelectron circular dichroism (TRPECD) with ultrashort circularly polarized vacuum-ultraviolet (VUV) pulses from a table-top source. We demonstrate the capabilities of VUV-TRPECD by resolving the chirality changes in time during the photodissociation of atomic iodine from two chiral molecules. We identify several general key features of TRPECD, which include the ability to probe dynamical chirality along the complete photochemical reaction path, the sensitivity to the local chirality of the evolving scattering potential, and the influence of electron scattering off dissociating photofragments. Our results are interpreted by comparison with novel high-level ab-initio calculations of transient PECDs from molecular photoionization calculations. Our experimental and theoretical techniques define a general approach to femtochirality.
description: 17 pages, 6 figures, 57 references, Accepted in Science Advances
Dark photon searches via Higgs boson production at the LHC and beyond
Creators: name: Biswas, Sanjoy
name: Gabrielli, Emidio
name: Mele, Barbara
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Many scenarios beyond the standard model, aiming to solve long-standing cosmological and particle physics problems, suggest that dark matter might experience long-distance interactions mediated by an unbroken dark $U(1)$ gauge symmetry, hence foreseeing the existence of a massless dark photon. Contrary to the massive dark photon, a massless dark photon can only couple to the standard model sector by means of effective higher dimensional operators. Massless dark-photon production at colliders will then in general be suppressed at low energy by a UV energy scale, which is of the order of the masses of portal (messenger) fields connecting the dark and the observable sectors. A violation of this expectation is provided by dark-photon production mediated by the Higgs boson, thanks to the non-decoupling Higgs properties. Higgs-boson production at colliders, followed by the Higgs decay into a photon and a dark photon, provides then a very promising production mechanism for the dark photon discovery, being insensitive in particular regimes to the UV scale of the new physics. This decay channel gives rise to a peculiar signature characterized by a monochromatic photon with energy half the Higgs mass (in the Higgs rest frame) plus missing energy. We show how such resonant photon-plus-missing-energy signature can uniquely be connected to a dark photon production. Higgs boson production and decay into a photon and a dark photon as a source of dark photons is reviewed at the Large Hadron Collider, in the light of the present bounds on the corresponding signature by the CMS and ATLAS collaborations. Perspectives for the dark-photon production in Higgs-mediated processes at future $e^+e^-$ colliders are also discussed.
description: same as published version, text improved, new references added, 41 pages, 14 figures