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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Cosmic ether 
    Tomaschitz, R (Springer, 1998-03)
    A prerelativistic approach to particle dynamics is explored in an expanding Robertson-Walker cosmology. The receding galactic background provides a distinguished frame of reference and a unique cosmic time. In this context ...
  • Cosmic evolution of AGN using self-consistent black hole energetics 
    Mangalam, A (Astronomical Society of India, 2015)
    We consider a model that takes into account the mass and spin accreted by the hole and the angular momentum torque due to an electrodynamical jet. The spin evolution is calculated with and without accretion; if the accretion ...
  • Cosmic perspectives : essays dedicated to the memory of M.K.V. Bappu 
    Biswas, S. K (editor); Mallik, D. C. V (editor); Vishveshwara, C. V (editor) (Cambridge University Press, 1989)
    Cosmic Perspectives is a collection of essays that details modern cosmology and its relationship to the development of human civilization. Written by leading astronomers, cosmologists and historians, these fourteen essays ...
  • Cosmic ray constraints on neutron-antineutron and hydrogen-antihydrogen oscillation time scales 
    Sivaram, C (INSDOC, 1983-08)
    Recently some modifications of the usual GUTS models have been proposed where global baryon-lepton symmetry is spontaneously broken, leading to neutron-antineutron and hydrogen-antihydrogen oscillations. The possible ...
  • Cosmic ray electron acceleration in the remnant of nova GK Persei? 
    Kantharia, N. G; Anupama, G. C; Subramanian, P (Tata Institute of Fundamental Research, 2005)
    Radio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral index of -0.7 at frequencies >1.4 GHz (Seaquist ...
  • The Cosmic Ray Flare of March 7, 1942 
    Sivaraman, K. R; Punetha, L. M (Kodaikanal Observatory, 1966-11)
    The variation of the dynamic characteristics of the cosmic ray limb flare of March 7, 1942 based on the K/sub232/ spectroheliograms and H-alpha spectrohelioscope observations of Kodaikanal is presented. Although the flare ...
  • Cosmic rays from cosmic strings and other topological defects 
    Bhattacharjee, P (World Scientific, 1995)
    The model of origin of ultrahigh energy (UHE) (i.e., energy E~> 10sup/8 eV) cosmic rays from cosmic topological defects such as cosmic strings, magnetic monopoles, etc., is discussed. We discuss the general nature of the ...
  • Cosmic relics from the microsecond epoch 
    Bhattacharjee, P (Saha Institute of Nuclear Physics, 1995)
    "A phase transition from quark-gluon plasma to hadronic matter may have ocurred in the early universe when the universe was about 10 ~sec old and the temperature was about 100-200 MeV. Is there any relic from that microsecond ...
  • Cosmic separation of phases, density inhomogeneities and primordial nucleosynthesis 
    Rana, N. C; Datta, B; Raha, S; Sinha, B (Elsevier, 1990-04)
    The authors investigate the role of the cosmic QCD phase transition on the relative abundances of light elements in primordial nucleosynthesis, with particular attention on the so-called 7Li over-production problem.
  • Cosmic Spin and Mass Evolution of Black Holes and Its Impact 
    Bhattacharyya, Dipanweeta; Mangalam, A (IOP Publishing, 2020-06-01)
    We build an evolution model of the central black hole that depends on the processes of gas accretion, the capture of stars, mergers, and electromagnetic torque. In the case of gas accretion in the presence of cooling ...
  • Cosmic Strings and Celestial Objects 
    Sivaram, C (Nature Publishing Group, 1987-05)
  • Cosmic tachyon background radiation 
    Tomaschitz, R (World Scientific Publishing, 1999-10)
    The equilibrium statistical mechanics of a background radiation of superluminal particles is investigated, based on a vectorial wave equation for tachyons of the Proca type. The partition function, the spectral energy ...
  • Cosmic Topological Defects, Highest Energy Cosmic Rays, and the Baryon Asymmetry of the Universe 
    Bhattacharjee, P (The American Physical Society, 1998-07)
    It is pointed out that the observed extremely high energy cosmic rays (EHECR) above 1011 GeV and the observed baryon asymmetry of the Universe (BAU) may have a common origin in baryon number violating decays of supermassive ...
  • Cosmic upper limits on the electric charges of the photon and the neutrino 
    Sivaram, C (University of Calgary, 1993)
    More stringent upper limits on the electric charge of photons than those deduced earlier from astrophysical considerations are given. Similar limits for the neutrino are given. These are more tight than those from arguments ...
  • Cosmochemistry: A Perspective 
    Goswami, A (Springer, 2010)
    Cosmochemistry can be said to aim at constructing a quantitative and continuous history of chemical evolution of our universe starting from appearance of hydrogenic matter immediately after the Big Bang. While the main ...
  • Cosmogenic radioisotopes in the Almahata Sitta ureilite 
    Carla, T; Narendra, B; Paolo, C; Alberto, R; Gianna, V; Neeharika, S; Peter, J; Muawia, H. S; Ballabh, G. M (John Wiley & Sons, 2010-11)
    Asteroid 2008 TC3 was predicted to fall in Sudan on October 7, 2008, and 2 months later, 15 meteorite fragments were recovered from the Nubian Desert. Most of these fragments were classified as polymict ureilites. In the ...
  • COSMOGLOBE DR1 results. I. Improved Wilkinson Microwave Anisotropy Probe maps through Bayesian end-to-end analysis 
    Watts, D. J; Basyrov, A; Eskilt, J. R; Galloway, M; Gjerlow, E; Hergt, L. T; Herman, D; Ihle, H. T; Paradiso, S; Fazlu, Rahman; Thommesen, H; Aurlien, R; Bersanelli, M; Bianchi, L. A; Brilenkov, M; Colombo, L. P. L; Eriksen, H. K; Franceschet, C; Fuskeland, U; Hensley, B; Hoerning, G. A; Lee, K; Lunde, J. G. S; Marins, A; Nerval, S. K; Patel, S. K; Regnier, M; San, M; Sanyal, S; Stutzer, N.O; Verma, A; Wehus, I. K; Zhou, Y (EDP Sciences, 2023-11)
    We present COSMOGLOBE Data Release 1, which implements the first joint analysis of WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end framework. This framework directly builds on a similar ...
  • COSMOGLOBE DR1 results. II. Constraints on isotropic cosmic birefringence from reprocessed WMAP and Planck LFI data 
    Eskilt, J. R; Watts, D. J; Aurlien, R; Basyrov, A; Bersanelli, M; Brilenkov, M; Colombo, L. P. L; Eriksen, H. K; Fornazier, K. S. F; Franceschet, C; Fuskeland, U; Galloway, M; Gjerlow, E; Hensley, B; Hergt, L. T; Herman, D; Ihle, H. T; Lee, K; Lunde, J. G. S; Nerval, S. K; Paradiso, S; Patel, S. K; Fazlu, Rahman; Regnier, M; San, M; Sanyal, S; Stutzer, N. O.; Thommesen, H; Verma, A; Wehus, I. K; Zhou, Y (EDP Sciences, 2023-11)
    Cosmic birefringence is a parity-violating effect that might have rotated the plane of the linearly polarized light of the cosmic microwave background (CMB) by an angle β since its emission. This angle has recently been ...
  • Cosmoglobe: Towards end-to-end CMB cosmological parameter estimation without likelihood approximations 
    Eskilt, J. R; Lee, K; Watts, D. J; Anshu, V; Aurlien, R; Basyrov, A; Bersanelli, M; Colombo, L. P. L; Eriksen, H. K; Fornazier, K. S. F; Fuskeland, U; Galloway, M; Gjerlow, E; Hergt, L. T; Ihle, H. T; Lunde, J. G. S; Marins, A; Nerval, S. K; Paradiso, S; Rahman, Fazlu; San, M; Stutzer, N. O; Wehus, I. K (EDP Sciences, 2023-10)
    We implement support for a cosmological parameter estimation algorithm in Commander and quantify its computational efficiency and cost. For a semi-realistic simulation similar to Planck LFI 70 GHz, we find that the ...
  • COSMOGRAIL: Measuring Time Delays of Gravitationally Lensed Quasars to Constrain Cosmology 
    Tewes, M; Courbin, F; Meylan, G; Kochanek, C. S; Eulaers, E; Cantale, N; Mosquera, A. M; Asfandiyarov, I; Magain, P; Van Winckel, H; Sluse, D; Keerthi, R. K. S; Stalin, C. S; Prabhu, T. P; Saha, P; Dye, S (ESO, 2012-12)
    COSMOGRAIL is a long-term programme for the photometric monitoring of gravitationally lensed quasars. It makes use of several medium-size telescopes to derive long and well-sampled light curves of lensed quasars, in order ...

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