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Browsing by Author "Arun, K"

Browsing by Author "Arun, K"

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  • Effects of dark matter in star formation 
    Arun, K; Gudennavar, S; Prasad, A; Sivaram, C (Springer, 2019-02)
    The standard model for the formation of structure assumes that there existed small fluctuations in the early universe that grew due to gravitational instability. The origins of these fluctuations are as yet unclear. In ...
  • Enigmatic aspects of entropy inside the black hole: what do falling comoving observers see? 
    Sivaram, C; Arun, K (Springer, 2012-01)
    In a recent paper it was suggested that inclusion of mutual gravitational interactions can give a possible scenario for reversing gravitation collapse and averting a singular phase. We extend this idea to the still unsolved ...
  • Enigmatic aspects of the early universe: possibility of a `pre-big bang phase'! 
    Sivaram, C; Arun, K (Springer, 2011-05)
    In this paper it is suggested that inclusion of mutual gravitational interactions among the particles in the early dense universe can lead to a ‘pre-big bang’ scenario, with particle masses greater than the Planck mass ...
  • Evolution of primordial dark matter planets in the early Universe 
    Kiren, O. V; Arun, K; Sivarani, C (Elsevier B. V, 2021-08-15)
    In a recent paper we had discussed possibility of DM at high redshifts forming primordial planets composed entirely of DM to be oneof the reasons for not detecting DM (as the flux of ambient DM particles would be consequently ...
  • Evolution of time concept in physics and in philosophy 
    Sivaram, C; Arun, K; Kiren, O. V (Science Publications, 2015-07)
    What is ‘time’? This is a question that has perplexed many aphysicist and philosophers alike. The perception of the passage of timeappears ingrained in all biological systems where growth, evolution anddecay of objects, ...
  • Extended Equivalence Principle: Implications for Gravity, Geometry and Thermodynamics 
    Sivaram, C; Arun, K (Handronic Press Inc, 2012)
    The equivalence principle was formulated by Einstein in an attempt to extend the concept of inertial frames to accelerated frames. Thereby bringing in gravity. In recent decades, it has been realized that gravity is linked ...
  • Extremal charged black holes, dark matter and dark energy 
    Sivaram, C; Arun, K; Prasad, A (Springer, 2018-10)
    Formation of black holes may be constrained by intrinsic parameters characterizing them such as electric charge. Here we discuss the effects of a relatively minute excess of charge on extremal black hole formation and the ...
  • Forming supermassive black holes like J1342+0928 (invoking dark matter) in early universe 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2018-02)
    Recent discovery of J1342+0928 using data from the WISE telescope and ground based surveys indicate presence of a supermassive black hole (SMBH) having a mass of 800 million solar mass at a redshift of about 7.6. This imply ...
  • Gravity of accelerations on quantum scales and its consequences 
    Sivaram, C; Arun, K; Kiren, O. V; Sreenath, B. N (Hadronic Press Inc, 2015-12)
    Gravity stands apart from other fundamental interactions in that it is locally equivalent to an accelerated frame and can be transformed away. Again it is indistinguishable from the geometry of space-time (which is an arena ...
  • Holography, dark energy and entropy of large cosmic structures 
    Sivaram, C; Arun, K (Springer, 2013-11)
    As is well known, black hole entropy is proportional to the area of the horizon suggesting a holographic principle wherein all degrees of freedom contributing to the entropy reside on the surface. In this note, we point ...
  • The Hubble tension: change in dark energy or a case for modified gravity? 
    Sivaram, C; Arun, K; Rebecca, Louise (Springer, 2022-03)
    Recently, much controversy has been raised about the cosmological conundrum involving the discrepancy in the value of the Hubble constant as implied by Planck satellite observations of the CMBR in the early Universe and ...
  • Hundred Years of Einstein's Cosmological Constant 
    Sivaram, C; Arun, K; Kiren, O. V; Sivaram, C (Isaac Scientific Publishing, 2018-06)
    It was little over a hundred years ago that Einstein introduced the ‘cosmological constant’ in his General Theory of Relativity in order to obtain a static universe, to conform to the philosophical view of the universe ...
  • Implications of Possible Alternate Scenarios for Short and Long Duration GRBs 
    Sivaram, C; Arun, K; Kiren, O. V (Bentham Open, 2014-12)
    Gamma-ray bursts (GRB) are the most luminous physical phenomena in the universe, consisting of flashes of gamma rays that last from seconds to hours. In this paper we look at possible alternate scenarios for both short and ...
  • Intermediate Mass Black Holes: Their Motion and Associated Energetics 
    Sivaram, C; Arun, K (Hindawi Publishing Corporation, 2014)
    There is a lot of current astrophysical evidence and interest in intermediate mass black holes (IMBH), ranging from a few hundred to several thousand solar masses.The active galaxy M82 and the globular cluster G1 in M31, ...
  • Is the binding energy of galaxies related to their core black hole mass? 
    Sivaram, C; Arun, K (Indian Academy of Sciences, 2021-10)
    Most of the large galaxies host a supermassive black hole, but their origin is still not well understood. In this paper, we look at a possible connection between the gravitational binding energies of large galaxies, etc., ...
  • Is there lower limit to velocity or velocity change? 
    Sreenath, B.N; Arun, K; Sivaram, C (Springer, 2013-05)
    Here we explore the possibility of a lower limit to velocity or velocity change which is 20 orders of magnitude smaller than the speed of light and explore the various observable signatures including those in cosmic rays ...
  • Landau’s major contribution to physics a brief overview 
    Sivaram, C; Arun, K (South Asian Publisher, 2009-06)
    Lev Davidovich Landau was arguably one of the greatest and most versatile physicists. His work spans a very wide range and has had a considerable impact on ail areas of physics including condensed matter physics, ...
  • Modern astronomy : startling facts 
    Sivaram, C; Arun, K (Ane Books, 2009)
    The year 2009 is being recognised as the international year of astronomy (IYA) to mark the four hundredth anniversary of the historical occasion in the year 1609 when Galileo Galilei used the then newly invented telescope ...
  • New Class of Dark Matter Objects and their Detection 
    Sivaram, C; Arun, K (Bentham Open, 2011-05)
    About one-fourth of the universe is thought to consist of dark matter. Yet there is no clear understanding about the nature of these particles. Commonly discussed dark matter candidates includes the so called WIMPs or ...
  • Nuclear detonation around compact objects 
    Sivaram, C; Arun, K; Kiren, O. V (Science Publications, 2014)
    In this study we explore the various aspects involved in nuclear detonations occurring around compact objects and the energetics involved. We discuss the possibility of sub-Chandrasekhar white dwarfs detonating due to the ...

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