Search

This contribution, presented at the 2016 conference on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas (ASOS12), shows how atomic physics contributes to the interpretation of emission-line spectra observed in astronomical nebulae, and discusses a few unsolved issues where atomic physics may play a role, although other possible explanations are indeed possible. It is limited to the determinations of chemical abundances, the most sought-after information derived from emission lines. [ABSTRACT FROM AUTHOR]

Landau damping is a fundamental phenomenon in plasma physics, which also plays an important role in astrophysics, and sometimes under different names, in fluid dynamics, and other fields. Its theoretical discussion in the framework of the Vlasov equation often assumes that the reference stationary state is homogeneous in space. However, Landau damping around an inhomogeneous reference stationary state, a natural setting in astrophysics for instance, induces new mathematical difficulties and physical phenomena. The goal of this article is to provide an introduction to these problems and the questions they raise. [ABSTRACT FROM AUTHOR]

Abstract: We review recent progress in numerical relativity simulations of black-hole (BH) spacetimes. Following a brief summary of the methods employed in the modeling, we summarize the key results in two major areas of BH physics: (i) BHs as sources of gravitational waves (GWs) and (ii) astrophysical systems involving BHs. We conclude with a list of the most urgent tasks for numerical relativity in these areas. [Copyright &y& Elsevier]

Abstract: Identification of dark matter is one of the most urgent problems in cosmology. I describe the astrophysical case for dark matter, from both an observational and a theoretical perspective. [Copyright &y& Elsevier]

Abstract: We study the effects of the nuclear network detail and of the flow divergence on the reaction zone of thermonuclear detonations in the 50%–50% Carbon–Oxygen plasma at initial temperature and density and . We show that the total or intermediate ideal combustion lengths can be 200 times smaller than with the reduced networks used so far and we identify two low-velocity, curved-detonation regimes with incomplete combustion. To cite this article: A. El Messoudi et al., C. R. Mecanique 335 (2007). [Copyright &y& Elsevier]