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Browsing by Author "Arun, K"

Browsing by Author "Arun, K"

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  • 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 ...
  • On internal heat production in exo-planets, fission triggered stars, etc.! 
    Sivaram, C; Arun, K (Indian Academy of Sciences, 2009-08-10)
  • Phase-Space Constraints on Neutrino Luminosities 
    Sivaram, C; Arun, K; Samartha, C. A (World Scientific Publishing Co., 2008-06-28)
    While the importance of phase space constraints for gravitational clustering of neutrinos (which are fermions) is well recognized, the explicit use of such constraints to limit neutrino emission from ultra energetic sources ...
  • Planckian pre big bang phase of the Universe 
    Sivaram, C; Arun, K; Rebecca, L (Springer, 2020-01)
    The standard model of cosmology, although very successful, has problems with the very initial phase, such as the existence of a singularity when the density and curvature becomes infinite. In this work we propose a possible ...
  • Planet nine, dark matter and MOND 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2016-07)
    Here we propose the possibility that the recently postulated Neptune-sized planet with an orbital period of 15,000 years could be a gravitationally condensed dark matter (DM) object. The observed mass of Planet Nine fits ...
  • Primordial black holes as heat sources for living systems with longest possible lifetimes 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2014-06)
    Just forty years ago, Hawking wrote his famous paper on primordial black holes (PBH). There have been since innumerable discussions on the consequences of the existence of such exotic objects and ramifications of their ...
  • Primordial planets predominantly of dark Matter 
    Sivaram, C; Arun, K; Kiren, O. V (Springer, 2019-05)
    Cosmic structure formation is thought to occur as a bottom-up scenario, i.e. the lightest objects would have formed first. It has been suggested that the earliest structures to form could have been primordial planets. Here ...
  • Primordial Rotation of the Universe, Hydrodynamics, Vortices and Angular Momenta of Celestial Objects 
    Sivaram, C; Arun, K (Bentham Open, 2012-03)
    The origin of rotation or spin of objects, from stars to galaxies, is still an unanswered question. Even though there are models which try to explain this, none of them can account for the initial impulse that gave rise ...
  • Some aspects of rotational and magnetic energies for a hierarchy of celestial objects 
    Sivaram, C; Arun, K (Springer, 2012-02)
    Celestial objects, from earth like planets to clusters of galaxies, possess angular momentum and magnetic fields. Here we compare the rotational and magnetic energies of a whole range of these celestial objects together ...

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