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Dark matter

A A Aguilar-Arevalo, M Backfish, A Bashyal, B Batell, B C Brown, R Carr, A Chatterjee, R L Cooper, P deNiverville, R Dharmapalan, Z Djurcic, R Ford, F G Garcia, G T Garvey, J Grange, J A Green, W Huelsnitz, I L de Icaza Astiz, G Karagiorgi, T Katori, W Ketchum, T Kobilarcik, Q Liu, W C Louis, W Marsh, C D Moore, G B Mills, J Mirabal, P Nienaber, Z Pavlovic, D Perevalov, H Ray, B P Roe, M H Shaevitz, S Shahsavarani, I Stancu, R Tayloe, C Taylor, R T Thornton, R Van de Water, W Wester, D H White, J Yu
The MiniBooNE-DM Collaboration searched for vector-boson mediated production of dark matter using the Fermilab 8-GeV Booster proton beam in a dedicated run with 1.86×10^{20} protons delivered to a steel beam dump. The MiniBooNE detector, 490 m downstream, is sensitive to dark matter via elastic scattering with nucleons in the detector mineral oil. Analysis methods developed for previous MiniBooNE scattering results were employed, and several constraining data sets were simultaneously analyzed to minimize systematic errors from neutrino flux and interaction rates...
June 2, 2017: Physical Review Letters
Felipe Herrera, Frank C Spano
Organic microcavities are photonic nanostructures that strongly confine the electromagnetic field, allowing exotic quantum regimes of light-matter interaction with disordered organic semiconductors. The unambiguous interpretation of the spectra of organic microcavities has been a long-standing challenge due to several competing effects involving electrons, vibrations, and cavity photons. Here we present a theoretical framework that is able to describe the main spectroscopic features of organic microcavities consistently...
June 2, 2017: Physical Review Letters
Graciela B Gelmini
Light weakly interacting massive particles (WIMPs) are dark matter particle candidates with weak scale interaction with the known particles, and mass in the GeV to tens of GeV range. Hints of light WIMPs have appeared in several dark matter searches in the last decade. The unprecedented possible coincidence into tantalizingly close regions of mass and cross section of four separate direct detection experimental hints and a potential indirect detection signal in gamma rays from the galactic center, aroused considerable interest in our field...
August 2017: Reports on Progress in Physics
A Hees, T Do, A M Ghez, G D Martinez, S Naoz, E E Becklin, A Boehle, S Chappell, D Chu, A Dehghanfar, K Kosmo, J R Lu, K Matthews, M R Morris, S Sakai, R Schödel, G Witzel
We demonstrate that short-period stars orbiting around the supermassive black hole in our Galactic center can successfully be used to probe the gravitational theory in a strong regime. We use 19 years of observations of the two best measured short-period stars orbiting our Galactic center to constrain a hypothetical fifth force that arises in various scenarios motivated by the development of a unification theory or in some models of dark matter and dark energy. No deviation from general relativity is reported and the fifth force strength is restricted to an upper 95% confidence limit of |α|<0...
May 26, 2017: Physical Review Letters
Christopher W Wood, Jack W Heal, Andrew R Thomson, Gail J Bartlett, Amaurys A Ibarra, R Leo Brady, Richard B Sessions, Derek N Woolfson
Motivation: The rational design of biomolecules is becoming a reality. However, further computational tools are needed to facilitate and accelerate this, and to make it accessible to more users. Results: Here we introduce ISAMBARD, a tool for structural analysis, model building and rational design of biomolecules. ISAMBARD is open-source, modular, computationally scalable and intuitive to use. These features allow non-experts to explore biomolecular design in silico ...
June 5, 2017: Bioinformatics
Brian Harriman, Phoebe Zito, David C Podgorski, Matthew A Tarr, Joseph M Suflita
While the biogeochemical forces influencing the weathering of spilled oil have been investigated for decades, the environmental fate and effects of 'oxyhydrocarbons' in sand patties deposited on beaches are not well known. We collected sand patties deposited in the swash zone on Gulf of Mexico beaches following the Deepwater Horizon oil spill. When sand patties were exposed to simulated sunlight, a larger concentration of dissolved organic carbon was leached into seawater than the corresponding dark controls...
June 1, 2017: Environmental Science & Technology
Alessandro Cuoco, Michael Krämer, Michael Korsmeier
We evaluate dark matter (DM) limits from cosmic-ray antiproton observations using the recent precise AMS-02 measurements. We properly take into account cosmic-ray propagation uncertainties, fitting DM and propagation parameters at the same time and marginalizing over the latter. We find a significant indication of a DM signal for DM masses near 80 GeV, with a hadronic annihilation cross section close to the thermal value, ⟨σv⟩≈3×10^{-26}  cm^{3} s^{-1}. Intriguingly, this signal is compatible with the DM interpretation of the Galactic center gamma-ray excess...
May 12, 2017: Physical Review Letters
Ming-Yang Cui, Qiang Yuan, Yue-Lin Sming Tsai, Yi-Zhong Fan
Using the latest AMS-02 cosmic-ray antiproton flux data, we search for a potential dark matter annihilation signal. The background parameters about the propagation, source injection, and solar modulation are not assumed a priori but based on the results inferred from the recent B/C ratio and proton data measurements instead. The possible dark matter signal is incorporated into the model self-consistently under a Bayesian framework. Compared with the astrophysical background-only hypothesis, we find that a dark matter signal is favored...
May 12, 2017: Physical Review Letters
Stephen Hayes, Jennifer Mahony, Arjen Nauta, Douwe van Sinderen
Bacteriophages are ubiquitous and numerous parasites of bacteria and play a critical evolutionary role in virtually every ecosystem, yet our understanding of the extent of the diversity and role of phages remains inadequate for many ecological niches, particularly in cases in which the host is unculturable. During the past 15 years, the emergence of the field of viral metagenomics has drastically enhanced our ability to analyse the so-called viral 'dark matter' of the biosphere. Here, we review the evolution of viral metagenomic methodologies, as well as providing an overview of some of the most significant applications and findings in this field of research...
May 24, 2017: Viruses
E Bagnaschi, M Borsato, K Sakurai, O Buchmueller, R Cavanaugh, V Chobanova, M Citron, J C Costa, A De Roeck, M J Dolan, J R Ellis, H Flächer, S Heinemeyer, G Isidori, M Lucio, F Luo, D Martínez Santos, K A Olive, A Richards, G Weiglein
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, [Formula: see text], may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces [Formula: see text] after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the [Formula: see text], the measured value of the Higgs mass favours a limited range of [Formula: see text] (and also for [Formula: see text] if [Formula: see text]) but the scalar mass [Formula: see text] is poorly constrained...
2017: European Physical Journal. C, Particles and Fields
Jake Lin, Lenka Kramna, Reija Autio, Heikki Hyöty, Matti Nykter, Ondrej Cinek
BACKGROUND: Next generation sequencing (NGS) technology allows laboratories to investigate virome composition in clinical and environmental samples in a culture-independent way. There is a need for bioinformatic tools capable of parallel processing of virome sequencing data by exactly identical methods: this is especially important in studies of multifactorial diseases, or in parallel comparison of laboratory protocols. RESULTS: We have developed a web-based application allowing direct upload of sequences from multiple virome samples using custom parameters...
May 15, 2017: BMC Genomics
D R Gulevich, D Yudin, D V Skryabin, I V Iorsh, I A Shelykh
Matter in nontrivial topological phase possesses unique properties, such as support of unidirectional edge modes on its interface. It is the existence of such modes which is responsible for the wonderful properties of a topological insulator - material which is insulating in the bulk but conducting on its surface, along with many of its recently proposed photonic and polaritonic analogues. We show that exciton-polariton fluid in a nontrivial topological phase in kagome lattice, supports nonlinear excitations in the form of solitons built up from wavepackets of topological edge modes - topological edge solitons...
May 11, 2017: Scientific Reports
N Abgrall, I J Arnquist, F T Avignone, A S Barabash, F E Bertrand, A W Bradley, V Brudanin, M Busch, M Buuck, T S Caldwell, Y-D Chan, C D Christofferson, P-H Chu, C Cuesta, J A Detwiler, C Dunagan, Yu Efremenko, H Ejiri, S R Elliott, T Gilliss, G K Giovanetti, J Goett, M P Green, J Gruszko, I S Guinn, V E Guiseppe, C R S Haufe, R Henning, E W Hoppe, S Howard, M A Howe, B R Jasinski, K J Keeter, M F Kidd, S I Konovalov, R T Kouzes, A M Lopez, J MacMullin, R D Martin, R Massarczyk, S J Meijer, S Mertens, C O'Shaughnessy, A W P Poon, D C Radford, J Rager, A L Reine, K Rielage, R G H Robertson, B Shanks, M Shirchenko, A M Suriano, D Tedeschi, J E Trimble, R L Varner, S Vasilyev, K Vetter, K Vorren, B R White, J F Wilkerson, C Wiseman, W Xu, E Yakushev, C-H Yu, V Yumatov, I Zhitnikov, B X Zhu
We present new limits on exotic keV-scale physics based on 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting g_{Ae}<4.5×10^{-13} for pseudoscalars and (α^{'}/α)<9.7×10^{-28} for vectors...
April 21, 2017: Physical Review Letters
Aaron D Ludlow, Alejandro Benítez-Llambay, Matthieu Schaller, Tom Theuns, Carlos S Frenk, Richard Bower, Joop Schaye, Robert A Crain, Julio F Navarro, Azadeh Fattahi, Kyle A Oman
We analyze the total and baryonic acceleration profiles of a set of well-resolved galaxies identified in the eagle suite of hydrodynamic simulations. Our runs start from the same initial conditions but adopt different prescriptions for unresolved stellar and active galactic nuclei feedback, resulting in diverse populations of galaxies by the present day. Some of them reproduce observed galaxy scaling relations, while others do not. However, regardless of the feedback implementation, all of our galaxies follow closely a simple relationship between the total and baryonic acceleration profiles, consistent with recent observations of rotationally supported galaxies...
April 21, 2017: Physical Review Letters
Hironao Miyatake, Mathew S Madhavacheril, Neelima Sehgal, Anže Slosar, David N Spergel, Blake Sherwin, Alexander van Engelen
We measure the gravitational lensing shear signal around dark matter halos hosting constant mass galaxies using light sources at z∼1 (background galaxies) and at the surface of last scattering at z∼1100 (the cosmic microwave background). The galaxy shear measurement uses data from the CFHTLenS survey, and the microwave background shear measurement uses data from the Planck satellite. The ratio of shears from these cross-correlations provides a purely geometric distance measurement across the longest possible cosmological lever arm...
April 21, 2017: Physical Review Letters
Bertjan Broeksema, Magdalena Calusinska, Fintan McGee, Klaas Winter, Francesco Bongiovanni, Xavier Goux, Paul Wilmes, Philippe Delfosse, Mohammad Ghoniem
BACKGROUND: Recent advances in high-throughput sequencing allow for much deeper exploitation of natural and engineered microbial communities, and to unravel so-called "microbial dark matter" (microbes that until now have evaded cultivation). Metagenomic analyses result in a large number of genomic fragments (contigs) that need to be grouped (binned) in order to reconstruct draft microbial genomes. While several contig binning algorithms have been developed in the past 2 years, they often lack consensus...
May 2, 2017: BMC Bioinformatics
Branden B Johnson
Publicized disputes between groups of scientists may force lay choices about groups' credibility. One possible, little studied, credibility cue is vote-counting (proportions of scientists on either side): for example, "97%" of climate scientists believe in anthropogenic climate change. An online sample of 2600 Americans read a mock article about a scientific dispute, in a 13 (proportions: 100%-0%, 99%-1%, … 50%-50%, … 1%-99%, 0%-100% for Positions A and B, respectively) × 8 (scenarios: for example, dietary salt, dark matter) between-person experiment...
April 1, 2017: Public Understanding of Science
Suzanne Dikker, Lu Wan, Ido Davidesco, Lisa Kaggen, Matthias Oostrik, James McClintock, Jess Rowland, Georgios Michalareas, Jay J Van Bavel, Mingzhou Ding, David Poeppel
The human brain has evolved for group living [1]. Yet we know so little about how it supports dynamic group interactions that the study of real-world social exchanges has been dubbed the "dark matter of social neuroscience" [2]. Recently, various studies have begun to approach this question by comparing brain responses of multiple individuals during a variety of (semi-naturalistic) tasks [3-15]. These experiments reveal how stimulus properties [13], individual differences [14], and contextual factors [15] may underpin similarities and differences in neural activity across people...
May 8, 2017: Current Biology: CB
Ikechukwu Agomoh, Xiying Hao, Francis Zvomuya
Repeated uptake of excess nutrients by crops in soils with a long history of manure application may be a viable option for reducing the nutrient levels. In this greenhouse study, we examined the effectiveness of six 40-day cycles of barley, canola, corn, oat, pea, soybean, and triticale, all grown under two moisture regimes (100% and 50% soil field capacity, SFC), at extracting nitrogen (N) and phosphorus (P) from a Dark Brown Chernozem that had received 180 Mg ha(-1) (wet wt.) of beef cattle feedlot manure annually for 38 years...
April 25, 2017: International Journal of Phytoremediation
Torsten Bringmann, Felix Kahlhoefer, Kai Schmidt-Hoberg, Parampreet Walia
Coupling dark matter to light new particles is an attractive way to combine thermal production with strong velocity-dependent self-interactions. Here we point out that in such models the dark matter annihilation rate is generically enhanced by the Sommerfeld effect, and we derive the resulting constraints from the cosmic microwave background and other indirect detection probes. For the frequently studied case of s-wave annihilation, these constraints exclude the entire parameter space where the self-interactions are large enough to address the small-scale problems of structure formation...
April 7, 2017: Physical Review Letters
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