Gamma-ray line signatures can be expected in the very-high-energy (E(Î³)>100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readilyâ€¦ (More)

In this paper, we consider the following singular first order functional difference equation Î”x(k) = âˆ’a(k)x(k) + Î»b(k)f(x(k âˆ’ Ï„(k))), k âˆˆ Z where f(.) is singular at x = 0. By using a Kranoselskiiâ€¦ (More)

In this paper, we investigate the existence and multiplicity of positive solutions for a singular second order scalar Sturm-Liouville boundary value problem with different values of Î» for a functionâ€¦ (More)

The inner region of the MilkyÂ Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for theâ€¦ (More)

We study the discrete approximation to solutions of first-order system arising from applying the trapezoidal rule to a second-order scalar ordinary differential equation. In the trapezoidal rule theâ€¦ (More)

We establish the existence of one or more than one positive periodic solutions of singular systems of first order difference equations âˆ†x(k) =âˆ’a(k)x(k)+Î»b(k)f(x(k)). The proof of our results is basedâ€¦ (More)

H. E. S. S. Collaboration, Attila Abramowski, +223 authorsH.-S. Zechlin

2015

H.E.S.S. Collaboration, A. Abramowski, F. Aharonian, 3, 4 F. Ait Benkhali, A.G. Akhperjanian, 5 E.O. AngÃ¼ner, M. Backes, S. Balenderan, A. Balzer, A. Barnacka, 11 Y. Becherini, J. Becker Tjus, D.â€¦ (More)

This paper is concerned with the existence of one or more positive solutions for a second order discrete system yi(k âˆ’ 1) + Î»ai(k)fi(y1(k), y2(k), Â· Â· Â· , yn(k)) + Î»ei(k) = 0, k âˆˆ N1,T , i = 1, 2, Â·â€¦ (More)