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Multifrequency Gravitational Wave Background from Continuous Sources

Journal of High Energy Physics, Gravitation and Cosmology 2021年第2期7卷 698-714页

作者： C. Sivaram arun kenath Indian Institute of Astrophysics Bangalore India Department of Physics and Electronics CHRIST (Deemed to Be University) Bangalore India Department of Physics Christ Junior College Bangalore India

Gravitational waves have been detected in the past few years from several transient events such as merging stellar mass black holes, binary neutron stars, etc. These waves have frequencies in a band ranging from a few hundred hertz to around a kilohertz to which LIGO type instruments are sensitive. LISA would be sensitive to much lower range of frequencies from SMBH mergers. Apart from these cataclysmic burst events, there are innumerable sources of radiation which are continuously emitting gravitational waves of all frequencies. These include a whole mass range of compact binary and isolated compact objects as well as close planetary stellar entities. In this work, quantitative estimates are made of the gravitational wave background produced in typical frequency ranges from such sources emitting over a Hubble time and the fluctuations in the h values measured in the usual devices. Also estimates are made of the high frequency thermal background gravitational radiation from hot stellar interiors and newly formed compact objects.

关键词： Gravitational Waves Neutron Star Mergers Black Hole Mergers Primordial Black Holes Continuous Gravitational Waves Thermal Gravitational Waves Detection of Gravitational Waves

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Non-Detection of Dark Matter Particles: A Case for Alternate Theories of Gravity

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Journal of High Energy Physics, Gravitation and Cosmology 2021年第2期7卷 680-686页

作者： C. Sivaram kenath arun A. Prasad Louise Rebecca Indian Institute of Astrophysics Bangalore India Department of Physics and Electronics CHRIST (Deemed to be University) Bangalore India Department of Physics Christ Junior College Bangalore India Center for Space Plasma & Aeronomic Research The University of Alabama in Huntsville Huntsville Alabama USA

While there is overwhelming evidence for dark matter (DM) in galaxies and galaxy clusters, all searches for DM particles have so far proved negative. It is not even clear whether only one particle is involved or a combination of particles, their masses not precisely predicted. This non-detectability raises the possible relevance of modified gravity theories: MOND, MONG, etc. Here we consider a specific modification of Newtonian gravity (MONG) which involves gravitational self-energy, leading to modified equations whose solutions imply flat rotation curves and limitations of sizes of clusters. The results are consistent with current observations including that involving large spirals. This modification could also explain the current Hubble tension. We also consider the effects of dark energy (DE) in terms of a cosmological constant.

关键词： Dark Matter Dark Energy Modification of Newtonian Gravity Hubble Tension

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