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Sökning: WFRF:(Subrahmanyan Ravi)

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1.
  • Carozzi, Tobia, 1966, et al. (författare)
  • Differentially Rotated SKALA4.1 Antennas in Vogel Configurations
  • 2023
  • Ingår i: 2023 35th General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2023.
  • Konferensbidrag (refereegranskat)abstract
    • We have studied the effects of non-aligned SKALA4.1 antennas in dense arrays with a Vogel layout. We find that the Vogel array is too dense at 2 m minimum inter-element distance for differential alignments to mitigate mutual-coupling, but polarimetric performance can be improved regardless.
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2.
  • Koopmans, Léon V. E., et al. (författare)
  • Peering into the dark (ages) with low-frequency space interferometers : Using the 21-cm signal of neutral hydrogen from the infant universe to probe fundamental (Astro)physics
  • 2021
  • Ingår i: Experimental astronomy. - : Springer Science and Business Media LLC. - 0922-6435 .- 1572-9508. ; 51, s. 1641-1676
  • Tidskriftsartikel (refereegranskat)abstract
    • The Dark Ages and Cosmic Dawn are largely unexplored windows on the infant Universe (z ~ 200–10). Observations of the redshifted 21-cm line of neutral hydrogen can provide valuable new insight into fundamental physics and astrophysics during these eras that no other probe can provide, and drives the design of many future ground-based instruments such as the Square Kilometre Array (SKA) and the Hydrogen Epoch of Reionization Array (HERA). We review progress in the field of high-redshift 21-cm Cosmology, in particular focussing on what questions can be addressed by probing the Dark Ages at z > 30. We conclude that only a space- or lunar-based radio telescope, shielded from the Earth’s radio-frequency interference (RFI) signals and its ionosphere, enable the 21-cm signal from the Dark Ages to be detected. We suggest a generic mission design concept, CoDEX, that will enable this in the coming decades.
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