scholarly journals Single Top and Dark Matter: Two is not always better than one

2017 ◽  
Author(s):  
Alberto Zucchetta
Keyword(s):  
Dark Matter ◽  
Single Top ◽  
Better Than

scholarly journals 3 per cent-accurate predictions for the clustering of dark matter, haloes, and subhaloes, over a wide range of cosmologies and scales

2020 ◽  
Vol 499 (4) ◽  
pp. 4905-4917
Author(s):  
S Contreras ◽  
R E Angulo ◽  
M Zennaro ◽  
G Aricò ◽  
M Pellejero-Ibañez
Keyword(s):  
Dark Matter ◽  
Spatial Distribution ◽  
Cosmological Parameters ◽  
Galaxy Surveys ◽  
Circular Velocity ◽  
Initial Application ◽  
Wide Range ◽  
Massive Neutrinos ◽  
Dynamical Dark Energy ◽  
Better Than

ABSTRACT Predicting the spatial distribution of objects as a function of cosmology is an essential ingredient for the exploitation of future galaxy surveys. In this paper, we show that a specially designed suite of gravity-only simulations together with cosmology-rescaling algorithms can provide the clustering of dark matter, haloes, and subhaloes with high precision. Specifically, with only three N-body simulations, we obtain the power spectrum of dark matter at z = 0 and 1 to better than 3 per cent precision for essentially all currently viable values of eight cosmological parameters, including massive neutrinos and dynamical dark energy, and over the whole range of scales explored, 0.03 < $k/{h}^{-1}\, {\rm Mpc}^{-1}$ < 5. This precision holds at the same level for mass-selected haloes and for subhaloes selected according to their peak maximum circular velocity. As an initial application of these predictions, we successfully constrain Ωm, σ8, and the scatter in subhalo-abundance-matching employing the projected correlation function of mock SDSS galaxies.

scholarly journals Generating approximate halo catalogues for blind challenges in precision cosmology

2019 ◽  
Vol 485 (2) ◽  
pp. 2407-2416 ◽  
Author(s):  
Lehman H Garrison ◽  
Daniel J Eisenstein
Keyword(s):  
Dark Matter ◽  
Transfer Function ◽  
Power Spectrum ◽  
High Precision ◽  
Real Space ◽  
Dark Matter Halo ◽  
The Real ◽  
The Galaxy ◽  
Similar Accuracy ◽  
Better Than

ABSTRACT We present a method for generating suites of dark matter halo catalogues with only a few N-body simulations, focusing on making small changes to the underlying cosmology of a simulation with high precision. In the context of blind challenges, this allows us to re-use a simulation by giving it a new cosmology after the original cosmology is revealed. Starting with full N-body realizations of an original cosmology and a target cosmology, we fit a transfer function that displaces haloes in the original so that the galaxy/HOD power spectrum matches that of the target cosmology. This measured transfer function can then be applied to a new realization of the original cosmology to create a new realization of the target cosmology. For a 1 per cent change in σ8, we achieve 0.1 per cent accuracy to $k = 1\, h\, \mathrm{Mpc}^{-1}$ in the real-space power spectrum; this degrades to 0.3 per cent when the transfer function is applied to a new realization. We achieve similar accuracy in the redshift-space monopole and quadrupole. In all cases, the result is better than the sample variance of our $1.1\, h^{-1}\, \mathrm{Gpc}$ simulation boxes.

scholarly journals Dark matter from electroweak single top production

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
Tilman Plehn ◽  
Jennifer M. Thompson ◽  
Susanne Westhoff
Keyword(s):  
Dark Matter ◽  
Single Top

scholarly journals Single-top final states as a probe of top-flavoured dark matter models at the LHC

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Monika Blanke ◽  
Priscilla Pani ◽  
Giacomo Polesello ◽  
Giulia Rovelli
Keyword(s):  
Dark Matter ◽  
Top Quark ◽  
Direct Detection ◽  
Final States ◽  
High Luminosity ◽  
Minimal Flavour Violation ◽  
Single Top ◽  
Discovery Potential ◽  
Flavour Violation ◽  
Flavour Physics

Abstract Models incorporating flavoured dark matter provide an elegant solution to the dark matter problem, evading the tight LHC and direct direction constraints on simple WIMP models. In Dark Minimal Flavour Violation, a simple framework of flavoured dark matter with new sources of flavour violation, the constraints from thermal freeze-out, direct detection experiments, and flavour physics create well-defined benchmark scenarios for these models. We study the LHC phenomenology of four such scenarios, focusing on final states where a single top quark is produced accompanied by no jets, one jet from the fragmentation of light quarks or a b-tagged jet. For each of these signatures we develop a realistic LHC analysis, and we show that the proposed analyses would increase the parameter space coverage for the four benchmarks, compared to existing flavour-conserving LHC analyses. Finally we show the projected discovery potential of the considered signatures for the full LHC statistics at 14 TeV, and for the High Luminosity LHC.

scholarly journals Rn gravity is kicking and alive: The cases of Orion and NGC 3198

2014 ◽  
Vol 23 (12) ◽  
pp. 1442005 ◽  
Author(s):  
Paolo Salucci ◽  
Christiane Frigerio Martins ◽  
Ekaterina Karukes
Keyword(s):  
Dark Matter ◽  
Power Law ◽  
Dwarf Galaxy ◽  
Rotation Curves ◽  
Better Than

We analyzed the Rotation Curves (RCs) of two crucial objects, the dwarf galaxy Orion and the low luminosity Spiral NGC 3198, in the framework of Rn gravity. We surprisingly found that the no dark matter (DM) power-law F(R) case fits them well, performing much better than LCDM halo models. The level of this unexpected success can be a boost for Rn gravity.

Associated production of single top quark and W boson through anomalous couplings at LHeC based γp colliders

2014 ◽  
Vol 29 (04) ◽  
pp. 1450021 ◽  
Author(s):  
I. T. Cakir ◽  
A. Senol ◽  
A. T. Tasci
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
W Boson ◽  
Hadron Colliders ◽  
Anomalous Couplings ◽  
Associated Production ◽  
Single Top ◽  
The Cross ◽  
Better Than

We consider the production of a single top quark in association with a W boson at LHeC based γp collider. We compute the cross-section for the process γp→WtX with the anomalous Wtb and Wtbγ couplings. We find that the sensitivities to anomalous couplings of top quark are shown to be comparable, even better than the ones obtained from direct searches at hadron colliders.

scholarly journals Active Control of Low-Frequency Noise through a Single Top-Hung Window in a Full-Sized Room

2020 ◽  
Vol 10 (19) ◽  
pp. 6817
Author(s):  
Bhan Lam ◽  
Dongyuan Shi ◽  
Valiantsin Belyi ◽  
Shulin Wen ◽  
Woon-Seng Gan ◽  
...  
Keyword(s):  
Active Control ◽  
Natural Ventilation ◽  
Active Noise Control ◽  
Low Frequency ◽  
Frequency Noise ◽  
Noise Mitigation ◽  
Single Top ◽  
Window Opening ◽  
Open Window ◽  
Better Than

The push for greater urban sustainability has increased the urgency of the search for noise mitigation solutions that allow for natural ventilation into buildings. Although a viable active noise control (ANC) solution with up to 10 dB of global attenuation between 100 Hz and 1000 Hz was previously developed for an open window, it had limited low-frequency performance below 300 Hz, owing to the small loudspeakers used. To improve the low-frequency attenuation, four passive radiator-based speakers were affixed around the opening of a top-hung ventilation window. The active control performance between 100 Hz and 700 Hz on a single top-hung window in a full-sized mock-up apartment room was examined. Active attenuation came close to the performance of the passive insulation provided by fully closing the window for expressway traffic and motorbike passing noise types. For a jet aircraft flyby, the performance of active attenuation with the window fully opened was similar to that of passive insulation with fully closed windows. In the case of low-frequency compressor noise, active attenuation’s performance was significantly better than the passive insulation. Overall, between 8 dB and 12 dB of active attenuation was achieved directly in front of the window opening, and up to 10.5 dB of attenuation was achieved across the entire room.

scholarly journals Constraining the cross-section of dark matter with giant radial arcs in galaxy clusters

2020 ◽  
Vol 500 (1) ◽  
pp. 247-258
Author(s):  
J Vega-Ferrero ◽  
J M Dana ◽  
J M Diego ◽  
G Yepes ◽  
W Cui ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Clusters ◽  
Cross Section ◽  
Central Region ◽  
Cold Dark Matter ◽  
The Other ◽  
Negligible Probability ◽  
Major Merger ◽  
Model Versus ◽  
Better Than

ABSTRACT We compare the statistics and morphology of giant arcs in galaxy clusters using N-body and non-radiative SPH simulations within the standard cold dark matter (CDM) model and simulations where dark matter (DM) has a non-negligible probability of interaction (parametrized by its cross-section), i.e self-interacting dark matter (SIDM). We use a ray-tracing technique to produce a statistically large number of arcs around six simulated galaxy clusters at different redshifts. Since DM is more likely to interact in colliding clusters than in relaxed clusters, and this probability of interaction is largest in denser regions, we focus our analysis on radial arcs (which trace the lensing potential in the central region better than tangential arcs) in galaxy clusters that underwent (or are undergoing) a major merger. We find that SIDM produces fewer radial arcs than standard CDM but they are on average more magnified. We also appreciate differences in the arc morphology that could be used to statistically favour one model versus the other.

scholarly journals Single top quarks and dark matter

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
Deborah Pinna ◽  
Alberto Zucchetta ◽  
Matthew R. Buckley ◽  
Florencia Canelli
Keyword(s):  
Dark Matter ◽  
Top Quarks ◽  
Single Top

scholarly journals Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies

2014 ◽  
Vol 441 (1) ◽  
pp. L6-L10 ◽  
Author(s):  
Aurel Schneider ◽  
Donnino Anderhalden ◽  
Andrea V. Macciò ◽  
Jürg Diemand
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Small Scale ◽  
Better Than
Sign in / Sign up

Export Citation Format

Share Document