American Journal of Astronomy and Astrophysics

Volume 5, Issue 2, March 2017

  • Experimental Verification of Theoretical Configuration Mixing in the Energy Levels of Er II Spectra via Isotope Shift Measurements Using a FTS

    Balkrishna Keraba Ankush, Mukul Narayan Deo

    Issue: Volume 5, Issue 2, March 2017
    Pages: 10-20
    Received: 8 February 2017
    Accepted: 22 February 2017
    Published: 9 March 2017
    Abstract: We report the first detailed investigation on isotope shift, Δσ166, 170 measurements carried out in the spectrum of singly- ionized erbium (Er II/ Er+) recorded with a FTS. Isotope shift in 85 spectral lines were determined in the 350- 590 nm wavelength region. The source was accomplished of mixture of highly enriched isotopes of 166Er: 170Er in 7:... Show More
  • From the Heterotic String Quartet to the Cosmic Dark Matter, Dark Energy and Ordinary Energy Symphony

    Mohamed S. El Naschie

    Issue: Volume 5, Issue 2, March 2017
    Pages: 21-24
    Received: 6 March 2017
    Accepted: 24 March 2017
    Published: 10 April 2017
    Abstract: The main novel part of the paper is to identify the 16 extra bosonic dimensions of the Heterotic string theory with the negative signature of K3 Kähler manifold and these in turn are the source of pure dark energy.Guided by the basic ideas and structure of heterotic string theory we establish an energy density triality, which add together to the th... Show More