Now showing items 1-2 of 2

    • The cosmological perturbed lightcone gauge 

      Elmardi, Maye (MDPI, 2018)
      The lightcone gauge is a set of what are called the observational coordinates adapted to our past lightcone. We develop this gauge by producing a perturbed spacetime metric that describes the geometry of our past lightcone ...
    • X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR) 

      Krawczynski, Henric S.; Böttcher, Markus; Stern, Daniel; Harrison, Fiona A.; Kislat, Fabian F. (Elsevier, 2016)
      This paper describes the Polarization Spectroscopic Telescope Array (PolSTAR), a mission proposed to NASA’s 2014 Small Explorer (SMEX) announcement of opportunity. PolSTAR measures the linear polarization of 3–50 keV ...