I am a PhD student in the Research Centre in Astronomy, Astrophysics & Astrophotonics at Macquarie University. Prior to taking up this position in April 2010, I was a postgraduate student in the Centre for Plasma Physics at the Queen's University Belfast and an early-stage researcher in the Department of Theoretical Physics at the University of Craiova. I obtained an MSc in Plasma Physics from the Queen's University Belfast in 2009 and an MSc in Computational Science from the University of Rostock in 2007.
My research currently focuses on the ionization and evolution of planetary nebulae with hydrogen-deficient central stars using the integral field unit (IFU) spectrograph. Although most central stars of planetary nebulae show hydrogen-rich surface abundances, a small fraction (5-20%) display stellar winds and a fast expanding hydrogen-deficient atmosphere. What is less clear are the physical mechanism and evolutionary paths which removes the outer hydrogen layer from these carbon-oxygen degenerate pre-white dwarfs, and transforms it into a fast stellar wind. I studies a carefully selected sample of planetary nebulae that have hydrogen-deficient central stars and few other planetary nebulae likely to contain close-binary central stars using a combined observational and empirical analysis approach. The results of this study will help us identify whether this type of central stars can evolve from a potential binary channel.
I studied the linear and nonlinear properties of acoustic-excitations in the presence of suprathermal electrons at the Queen's University of Belfast in 2009. We see the formation of electron-accoutsic solitary waves in the Earth's bow shock, the auroral magnetosphere, and the Broadband Electrostatic Noise, which are associated with the mutual compensation between nonlinearity and dispersion. I investigated the existence domains of stationary profile solitary waves and discussed how their characteristics depend on plasma parameters (Danehkar et al. 2011).
I studied the BRST (Becchi, Rouet & Stora, 1974; Tyutin 1975) couplings between a background field (BF) and a dual formulation of linearized gravity at the University of Craiova in 2008. The BRST formalism presents the local gauge symmetry as a replacement for the original gauge symmetry, and provides useful way of studying the consistent interactions in terms of the deformation to the solutions of the master equation (Barnich & Henneaux 1993). We found that the dual formulation of linearized gravity can be coupled to another theory in more than 3+1 spacetime (Bizdadea et al. 2009).