Negative / Null Result ReportOpen accessPhysics and Astronomy
Ciarán Hickey, Simon Trebst · 2019 · Nature Communications
In the field of quantum magnetism, the exactly solvable Kitaev honeycomb model serves as a paradigm for the fractionalization of spin degrees of freedom and the formation of [Formula: see text] quantum spin liquids. An intense experimental search has led to the discovery of a number of spin-orbit entangled Mott insulators that realize its characteristic bond-directional interactions and, in the presence of magnetic fields, exhibit no indications of long-range order. Here, we map out the complete phase diagram of the Kitaev model in tilted magnetic fields and report the emergence of a distinct
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
C. Abel, N. J. Ayres, G. Ban et al. · 2017 · Physical Review X
We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spinprecession frequencies of stored ultracold neutrons and 199 Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10 -24 m a 10 -17 eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Yuichiro Ando, Takahiro Hamasaki, Takayuki Kurokawa et al. · 2014 · Nano Letters
We detected the spin polarization due to charge flow in the spin nondegenerate surface state of a three-dimensional topological insulator by means of an all-electrical method. The charge current in the bulk-insulating topological insulator…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
R. Cotesta, G. Carullo, Emanuele Berti et al. · 2022 · Physical Review Letters
We analyze GW150914 postmerger data to understand if ringdown overtone detection claims are robust. We find no evidence in favor of an overtone in the data after the waveform peak. Around the peak, the Bayes factor does not indicate the…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Y. W. Wu, M. Sato, M. J. Reid et al. · 2014 · Astronomy and Astrophysics
We report measurements of parallaxes and proper motions of ten high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way as part of the BeSSeL Survey with the VLBA. Combining these results with eight others from the…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Ladan Arissian, Christopher Smeenk, F. Turner et al. · 2010 · Physical Review Letters
Tunneling is often used to describe multiphoton ionization of rare gas atoms in infrared fields. We test the tunneling approximation and its nonadiabatic extension by measuring the unperturbed momentum distribution along the κ direction of…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
B. P. Abbott, R. Abbott, T. D. Abbott et al. · 2019 · Physical review. D/Physical review. D.
We present results of an all-sky search for continuous gravitational waves (CWs), which can be produced by fast-spinning neutron stars with an asymmetry around their rotation axis, using data from the second observing run of the Advanced…
View details →Failed Experiment ReportOpen accessPhysics and Astronomy
Eric M Kenney, Brenden R Ortiz, Chennan Wang et al. · 2021 · Journal of Physics Condensed Matter
Abstract We have carried out muon spin relaxation and rotation measurements on the newly discovered kagome metal KV 3 Sb 5 , and find a local field dominated by weak magnetic disorder which we associate with the nuclear moments present,…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
D. Rubin, G. Aldering, M. Betoule et al. · 2025 · The Astrophysical Journal
Abstract Type Ia supernovae (SNe Ia) were instrumental in establishing the acceleration of the Universe’s expansion. By virtue of their combination of distance reach, precision, and prevalence, they continue to provide key cosmological constraints, complementing other cosmological probes. Individual SN surveys cover only over about a factor of 2 in redshift, so compilations of multiple SN data sets are strongly beneficial. We assemble an up-to-date “Union” compilation of 2087 cosmologically useful SNe Ia from 24 data sets (“Union3”). We take care to put all SNe on the same distance scale and u
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J. Abadie, B. P. Abbott, R. Abbott et al. · 2012 · The Astrophysical Journal
We present the results of a search for gravitational waves associated with 154 gamma-ray bursts (GRBs) that were detected by satellite-based gamma-ray experiments in 2009-2010, during the sixth LIGO science run and the second and third…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
A. Anastasi, D. Babusci, G. Bencivenni et al. · 2016 · Physics Letters B
The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e - U, U + -based on 28 million e + e - + - events collected at DA NE by the KLOE experiment. The + -production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U e + e -, + -searches due to the small branching ratios in the - resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the
View details →Failed Experiment ReportOpen accessPhysics and Astronomy
Priyanca Ford, G L Kulcinski · 2026 · Zenodo (CERN European Organization for Nuclear Research)
Aegis is the forward-base configuration of the Kronos deuterium–helium-3 tandem-mirror burner: a fixed, hardened, grid-independent installation that turns an aneutronic-dominated fusion source into firm electrical power for a defence site without a fuel-convoy tail. This paper is a comprehensive, review-article treatment of the integrated physics case for that machine, and it separates, throughout, what is robust from what is conditional. At the frozen design point the plant reaches an engineering gain =1.318 at fusion power 4298.5 MW, of which 3868.0 MW is the charged-particle D+ ^3He p (14.6
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Asher Berlin · 2016 · Physical Review Letters
We consider a class of models involving interactions between ultralight scalar dark matter and standard model neutrinos. Such couplings modify the neutrino mass splittings and mixing angles to include additional components that vary in…
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Patrick L. Kelly, Ori D. Fox, Alexei V. Filippenko et al. · 2014 · The Astrophysical Journal
We constrain the properties of the progenitor system of the highly reddened Type Ia supernova (SN Ia) 2014J in Messier 82 (M82; d ≈ 3.5 Mpc). We determine the supernova (SN) location using Keck-II K-band adaptive optics images, and we find…
View details →Replication FailureOpen accessPhysics and Astronomy
R. Abbott, H. Abe, F. Acernese et al. · 2025 · Physical review. D/Physical review. D.
The ever-increasing number of detections of gravitational waves from compact binaries by the Advanced LIGO and Advanced Virgo detectors allows us to perform ever-more sensitive tests of general relativity (GR) in the dynamical and…
View details →Replication FailureOpen accessPhysics and Astronomy
Priyanca Ford, G L Kulcinski · 2026 · Zenodo (CERN European Organization for Nuclear Research)
Fusion breeders have historically foundered on two coupled obstacles: net electricity forces a large plasma and a large blanket, and a self-sufficient closed fuel cycle at power-plant scale implies a dangerous standing tritium inventory. Both are consequences of demanding electricity from a device whose neutrons are physically its most valuable output. We present the integrated physics of Hyperion, a compact negative-triangularity spherical-tokamak breeder sized to a strategic-materials mission — tritium, helium-3, and 14 MeV neutrons — and show that once the net-electricity requirement is dro
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Antoine Boutet, Hyoungshick Kim, Eiko Yoneki · 2021 · Proceedings of the International AAAI Conference on Web and Social Media
Nowadays, the use of social media such as Twitter is necessary to monitor trends of people on political issues. As a case study, we collected the main stream of Twitter related to the 2010 UK general election during the associated period.…
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L. Easy, F. Militello, John Omotani et al. · 2014 · Physics of Plasmas
This paper presents simulations of isolated 3D filaments in a slab geometry obtained using a newly developed 3D reduced fluid code, written using the BOUT++ framework. First, systematic scans were performed to investigate how the dynamics…
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C. Schaefer, Mario Geiger, T. Kuntzer et al. · 2017 · Astronomy and Astrophysics
Context. Future large-scale surveys with high-resolution imaging will provide us with approximately 10 5 new strong galaxy-scale lenses. These strong-lensing systems will be contained in large data amounts, however, which are beyond the…
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J. Suzuki, Tomoki Horie, Yoshiyuki Inoue et al. · 2015 · Journal of Cosmology and Astroparticle Physics
A search for hidden photon cold dark matter (HP CDM) using a new technique with a dish antenna is reported. From the result of the measurement, we found no evidence for the existence of HP CDM and set an upper limit on the photon-HP mixing parameter $\chi$ of $\sim 6\times 10^{-12}$ for the hidden photon mass $m_\gamma = 3.1 \pm 1.2$ eV.
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Adrian Abac, I. Abouelfettouh, F. Acernese et al. · 2026 · The Astrophysical Journal Letters
Abstract Version 4.0 of the Gravitational-Wave Transient Catalog (GWTC-4.0) adds new candidates detected by the LIGO, Virgo, and KAGRA observatories through the first part of the fourth observing run (O4a: 2023 May 24 15:00:00 to 2024 January 16 16:00:00 UTC) and a preceding engineering run. In these new data, we find 128 compact binary coalescence candidates that are identified by at least one of our search algorithms with a probability of astrophysical origin p astro ≥ 0.5 and that are not vetoed during event validation. We also provide detailed source property measurements for 86 of these t
View details →Failed Experiment ReportOpen accessPhysics and Astronomy
Priyanca Ford, G L Kulcinski · 2026 · Zenodo (CERN European Organization for Nuclear Research)
Aegis is the forward-base configuration of the Kronos deuterium–helium-3 tandem-mirror burner: a fixed, hardened, grid-independent installation that turns an aneutronic-dominated fusion source into firm electrical power for a defence site without a fuel-convoy tail. This paper is a comprehensive, review-article treatment of the integrated physics case for that machine, and it separates, throughout, what is robust from what is conditional. At the frozen design point the plant reaches an engineering gain =1.318 at fusion power 4298.5 MW, of which 3868.0 MW is the charged-particle D+ ³He p (14.68
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Michael W. Topping, Dan Stark, Peter Senchyna et al. · 2025 · The Astrophysical Journal
Abstract JWST has recently discovered a subset of reionization era galaxies with ionized gas that is metal-poor in oxygen and carbon but heavily enriched in nitrogen. This abundance pattern is almost never seen in lower-redshift galaxies but is commonly observed in globular cluster stars. We have recently demonstrated that this peculiar abundance pattern appears in a compact (≃20 pc) metal-poor galaxy undergoing a strong burst of star formation. This galaxy was originally selected based on strong C iv emission, indicating a hard radiation field rarely seen locally. In this paper, we present JW
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Ben Yelverton, Grant M. Kennedy, K. Y. L. Su et al. · 2019 · Monthly Notices of the Royal Astronomical Society
Abstract We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterizing Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously…
View details →Failed Experiment ReportPhysics and Astronomy
V. K. Dixit, S. Porwal, S. D. Singh et al. · 2014 · Journal of Physics D Applied Physics
Temperature dependence of the photoluminescence (PL) peak energy of bulk and quantum well (QW) structures is studied by using a new phenomenological model for including the effect of localized states. In general an anomalous S-shaped…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
Sheehan H. Ahmed, Alyson Brooks, Charlotte Christensen · 2016 · Monthly Notices of the Royal Astronomical Society
We investigate whether the inclusion of baryonic physics influences the formation of thin, coherently rotating planes of satellites such as those seen around the Milky Way and Andromeda. For four Milky Way-mass simulations, each run both…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
David J. Setton, Jenny E. Greene, Anna de Graaff et al. · 2025 · The Astrophysical Journal
Abstract Among the most puzzling early discoveries of JWST are “little red dots” (LRDs), compact red sources that host broad Balmer emission lines, and in many cases exhibit a “V-shaped” change in slope in the rest-optical. The physical properties of LRDs currently have order-of-magnitude uncertainties, because models to explain the continuum of these sources differ immensely. Here, we leverage the complete selection of red sources in the RUBIES program, supplemented with public PRISM spectra, to study the origin of this V shape. By fitting a broken power law with a flexible inflection point,
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Chunyan Wang, Bernardo A. Huberman · 2012 · Scientific Reports
The massive amounts of data that social media generates has facilitated the study of online human behavior on a scale unimaginable a few years ago. At the same time, the much discussed apparent randomness with which people interact online…
View details →Negative / Null Result ReportOpen accessPhysics and Astronomy
K. Masuda, Joshua N. Winn · 2017 · The Astronomical Journal
Abstract We revisit the null result of the Hubble Space Telescope search for transiting planets in the globular cluster 47 Tucanae, in the light of improved knowledge of planet occurrence from the Kepler mission. Gilliland and co-workers…
View details →Negative / Null Result ReportPhysics and Astronomy
A. Malagoli, Fumitake Kametani, Jianyi Jiang et al. · 2011 · Superconductor Science and Technology
It is well known that the critical current density Jc of multifilamentary Bi-2212 wires tends to decline as the wire length increases, but the reasons for and the magnitude of this decline remain obscure and quantitatively unpredictable.…
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