International Journal of Astrophysics and Space Science

Archive

Volume 3, Issue 5, October 2015

  • Annual Fluctuations (~10-12 W•m-2) in Ground Level Photon Power Densities: Quantitative Evidence for Possible Modulation From the Galactic Center

    Michael A. Persinger

    Issue: Volume 3, Issue 5, October 2015
    Pages: 70-73
    Received: 28 July 2015
    Accepted: 17 August 2015
    Published: 29 August 2015
    DOI: 10.11648/j.ijass.20150305.11
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    Abstract: The numbers of photons per second for more than a year (2013-2014) recorded every ~2.5 s by a digital photomultiplier unit was maximum during August to October and minimum during February through April. The peak-to-peak difference in quantity for the classical, smooth variation was 2.4 x 10-12 W m-2. This value is within the order of magnitude for ... Show More
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  • A Mathematical Aspect of FRW - Cosmological Models Varying t and Λ

    A. S. M. Mohiul Islam, Abul Kalam Azad

    Issue: Volume 3, Issue 5, October 2015
    Pages: 74-77
    Received: 30 August 2015
    Accepted: 17 September 2015
    Published: 29 September 2015
    DOI: 10.11648/j.ijass.20150305.12
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    Abstract: In this paper discussing about the mathematical aspect of variables such as cosmological constant (Λ) and gravitational constant (G) under some suitable assumptions, G(t)=F exp(3Hγt) (where is constant and γ is equation of state parameter), and the cosmological constant. Λ∞t-2 The exact solutions for the field equations and discuss some physical p... Show More
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