I obtained my PhD in Physics and Astronomy from Macquarie University for my study on planetary nebulae with WR-type central stars in 2014. I have been a PhD student in the Research Centre in Astronomy, Astrophysics & Astrophotonics at Macquarie University since 2010. Prior to taking up this position, 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 my MSc in Plasma Physics from the Queen's University Belfast in 2009.
My PhD research focused on the physical and chemical 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 studied 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 my study may help us identify whether hydrogen-deficient central stars evolved from a 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).