Finite Element Modelling of Elastic-Plastic Contact of Rough Surfaces

Abdo, Jamil; Haneef, Danish; Al-Shabibi, Abdullah M.

doi:10.5772/10218

Cited by 13 publications

(21 citation statements)

References 27 publications

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“…The number of NS LMXBs in GCs as well as part of the CV population appears to scale with the stellar encounter rate of their host cluster, indicating that they are indeed produced through dynamical mechanisms (Gendre et al 2003;Pooley et al 2003;Pooley & Hut 2006). The same correlation is observed with MSPs in GCs detected in radio (Hui et al 2010), and even in γ -rays (Abdo et al 2010).…”

Section: Introductionsupporting

confidence: 66%

A Dwarf Nova in the Globular Cluster M13

Servillat

Webb

Lewis

et al. 2011

ApJ

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Dwarf novae (DNe) in globular clusters (GCs) seem to be rare with only 13 detections in the 157 known Galactic GCs. We report the identification of a new DN in M13, the 14th DN identified in a GC to date. Using the 2 m Faulkes Telescope North, we conducted a search for stars in M13 that show variability over a year (2005)(2006) on timescales of days and months. This led to the detection of one DN showing several outbursts. A Chandra X-ray source is coincident with this DN and shows both a spectrum and variability consistent with that expected from a DN, thus supporting the identification. We searched for a counterpart in Hubble Space Telescope Advanced Camera for Surveys/Wide Field Camera archived images and found at least 11 candidates, of which we could characterize only the 7 brightest, including one with a 3σ Hα excess and a faint blue star. The detection of one DN when more could have been expected likely indicates that our knowledge of the global Galactic population of cataclysmic variables is too limited. The proportion of DNe may be lower than found in catalogs, or they may have a much smaller mean duty cycle (∼1%) as proposed by some population synthesis models and recent observations in the field.

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Section: Introductionsupporting

confidence: 66%

A Dwarf Nova in the Globular Cluster M13

Servillat

Webb

Lewis

et al. 2011

ApJ

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“…If DM particles annihilate or decay into SM particles, the signature of the final products of such processes may be detected up to some uncertainty in the astrophysical background component. In order to set constraints on the diverse DM models and get a better understanding of the astrophysical factor associated with the distribution of this kind of matter, numerous signals detected in gamma-rays, neutrinos, positrons, antiprotons and other particles have been studied in the available literature [10][11][12][13][14][15][16][17][18]. Most of these analysis make use of Monte Carlo event generator packages, that allow to predict the spectra of final-state particles generated by DM annihilation and decays into SM particles.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Monte Carlo event generators for gamma-ray dark matter searches

Cembranos

Cruz-Dombriz

Gammaldi

et al. 2013

J. High Energ. Phys.

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Abstract:We study the differences in the gamma-ray spectra simulated by four Monte Carlo event generator packages developed in particle physics. Two different versions of PYTHIA and two of HERWIG are analyzed, namely PYTHIA 6.418 and HERWIG 6.5.10 in Fortran and PYTHIA 8.165 and HERWIG 2.6.1 in C++. For all the studied channels, the intrinsic differences between them are shown to be significative and may play an important role in misunderstanding dark matter signals.

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“…1. In this case, the photon fluxes would be in the range detectable by space-based gamma ray observatories [16] such as EGRET [20] and FERMI [21,22], with better sensitivities around 30 MeV-300 GeV.…”

Section: Gamma Raysmentioning

confidence: 99%

“…Particles that might either make non astrophysical gamma rays and/or need to be rejected as background are included. The model does not include X-rays nor soft gamma rays that might cause individual detectors within the LAT to be activated [21,22]. Recent investigations [23] have looked for potential DM subhalos targets for ACTs and FERMI at energies higher than 100 GeV claiming that multi-wavelength observations could play an essential role in DM indirect searches.…”

Section: Fermimentioning

confidence: 99%

Detection of branon dark matter with gamma ray telescopes

et al. 2012

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Branons are new degrees of freedom that appear in flexible brane-world models corresponding to brane fluctuations. These new fields can behave as standard weakly interacting massive particles (WIMPs) with a significant associated thermal relic density. We analyze the present constraints from their spontaneous annihilations into photons for EGRET, Fermi-LAT and MAGIC, and the prospects for detection in future Cherenkov telescopes. In particular, we focus on possible signals coming from the Galactic Center and different dwarf spheroidals, such as Draco, Sagittarius, Canis Major and SEGUE 1. We conclude that for those targets, present observations are below the sensitivity limits for branon detection by assuming standard dark matter distributions and no additional boost factors. However, future experiments such as CTA could be able to detect gamma-ray photons coming from the annihilation of branons with masses higher than 150 GeV.

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Finite Element Modelling of Elastic-Plastic Contact of Rough Surfaces

Cited by 13 publications

References 27 publications

A Dwarf Nova in the Globular Cluster M13

A Dwarf Nova in the Globular Cluster M13

Reliability of Monte Carlo event generators for gamma-ray dark matter searches

Detection of branon dark matter with gamma ray telescopes

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