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Browsing IIAP Publications by Title

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  • A quantum field theoretic description of the delayed choice experiment 
    Srikanth, R (Indian Academy of Sciences, 2001-11)
  • Quantum general relativity, torsion and uncertainty relations 
    de Sabbata, V; Sivaram, C; Borzeszkowski, H. H. V; Treder, H. J (John Wiley & Sons, Inc., 1991)
    It is shown that in gravitational theories with torsion one is led to commutation rules corresponding to Landau-Peierls type uncertainty relations.
  • The Quantum Interference Effects in the Sc II 4247 Å Line of the Second Solar Spectrum 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Ramelli, R (IOP Publishing, 2014-10-10)
    The Sc II 4247 Å line formed in the chromosphere is one of the lines well known, like the Na I D2 and Ba II D2, for its prominent triple-peak structure in Q/I and the underlying quantum interference effects governing it. ...
  • Quantum interference with angle-dependent partial frequency redistribution: solution of the polarized line transfer in the non-magnetic case 
    Supriya, H. D; Smitha, H. N; Nagendra, K. N; Ravindra, B; Sampoorna, M (Oxford University Press on behalf of the Royal Astronomical Society, 2013-02-11)
    Angle-dependent partial frequency redistribution (PRD) matrices represent the physical redistribution in the process of light scattering on atoms. For the purpose of numerical simplicity, it is a common practice in ...
  • Quantum phases of attractive bosons on a Bose-Hubbard ladder with three-body constraint 
    Singh, Manpreet; Mishra, T; Pai, Ramesh V; Das, B. P (The American Physical Society, 2014-07)
    We obtain the complete quantum phase diagram of bosons on a two-leg ladder in the presence of attractive onsite and repulsive interchain nearest-neighbor interactions by imposing the onsite three-body constraint. We find ...
  • Quantum phases of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2011-05)
    We analyze various quantum phases of ultracold bosonic atoms in a periodic one-dimensional optical superlattice. Our studies have been performed using the finite-size density-matrix renormalization group method in the ...
  • Quasar catalogue for the astrometric calibration of the forthcoming ILMT survey 
    Mandal, A. K; Pradhan, Bikram; Surdej, Jean; Stalin, C. S; Sagar, R; Mathew, B (Indian Academy of Sciences, 2020-12)
    Quasars are ideal targets to use for astrometric calibration of large scale astronomical surveys as they have negligible proper motion and parallax. The forthcoming 4-m International Liquid Mirror Telescope (ILMT) will ...
  • Quasars in Variable Mass Hypothesis 
    Das, P. K (Indian Academy of Sciences, 1997-12)
    The variable Mass Hypothesis of conformal gravitation theory of Hoyle-Narlikar is used to develop a model for the anomalous redshift quasar-galaxy associations. It is hypothesised that quasars are born in and ejected from ...
  • Quasi 9 and 30–40 days periodicities in the solar differential rotation 
    Javaraiah, J (Elsevier B.V., 2011-09-15)
    Using the daily Mt. Wilson Doppler velocity data during 1986–1994 (solar cycle 22), we studied the short-term variations of the order of a few days to a month timescales in the solar differential rotation. We represent the ...
  • Quasi-periodic oscillation of a coronal bright point 
    Samanta, T; Banerjee, D; Tian, H (IOP Publishing, 2015-06-20)
    Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightenings are frequently observed in the BPs and are generally linked with underlying magnetic flux changes. We study ...
  • Quasi-periodic spicule-like cool jets driven by Alfvén pulses 
    Singh, B; Srivastava, A. K; Sharma, K; Mishra, S. K; Dwivedi, B. N (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We perform a 2.5D magnetohydrodynamic simulation to gain a comprehensive understanding of the formation of spicule-like cool jets caused by initial transverse velocity pulses akin to Alfven´ pulses in the solar chromosphere. ...
  • Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms 
    Sundaram, G. A. S; Subramanian, K. R (Springer, 2004-08)
    We present observational results from studying the quasi-periodicities in global solar radio flux during periods of enhanced noise storm activity, over durations of 4 hr a day (`intra-day'' variations), observed at 77.5 ...
  • Quasiadiabatic dynamics of ultracold bosonic atoms in a one-dimensional optical superlattice 
    Dhar, A; Rossini, D; Das, B. P (The American Physical Society, 2015-09)
    We study the quasiadiabatic dynamics of a one-dimensional system of ultracold bosonic atoms loaded in an optical superlattice. Focusing on a slow linear variation in time of the superlattice potential, the system is driven ...
  • Quenching of NO2 continuum by NO, H2O & CH4 
    Ghosh, K. K (Publications & Information Directorate, CSIR, 1984-10)
    The K/A ratio, where K is the quenching rate coefficient of NO2 continuum by NO2, H2O and CH4 and A is the transition probability of NO2 continuum, has been measured using flowing afterglow method. The obtained values are ...
  • Quiescence of an outburst of a low-mass young stellar object: LDN1415-IRS 
    Singh, Koshvendra; Ojha, Devendra K.; Ninan, Joe P.; Sharma, Saurabh; Ghosh, Supriyo; Ghosh, Arpan; Bhatt, B. C; Sahu, D. K (Indian Academy of Sciences, 2023-12)
    LDN1415-IRS, a low-mass young stellar object (YSO), went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have brightened by I=3.77 mag by April 2006. The ...
  • Quiet-Sun variability with the solar cycle 
    Kariyappa, R (Astronomical Society of the Pacific, 1999)
    In evaluating the contribution of various chromospheric features to total CaII K-emission flux and UV irradiance variability, the quiet-Sun is also one of the essential and important component. We have segregated the disc ...
  • R Coronae Borealis at the 2003 light minimum 
    Kameswara Rao, N; Lambert, D. L; Shetrone, M. D (Blackwell Publishing, 2006-08)
    A set of five high-resolution optical spectra of R CrB obtained in 2003 March is discussed. At the time of the first spectrum (March 8), the star was at V = 12.6, a decline of more than six magnitudes. By March 31, the ...
  • The R Coronae Borealis stars - A few mere facts 
    Lambert, D. L; Kameswara Rao, N (Indian Academy of Sciences, 1994-03)
    This review presents a selection of recent highlights of observations of R Coronae Borealis (RCB) variables. Emphasis is placed on an abundance analysis of a complete sample (18 stars) of the warm galactic RCBs. It is shown ...
  • The R Coronae Borealis stars - atmospheres and abundances 
    Asplund, M; Gustafsson, B; Lambert, D. L; Kameswara Rao, N (European Southern Observatory, 2000-01)
    An abundance analysis of the H-deficient and He- and C-rich R Coronae Borealis (R CrB) stars has been undertaken to examine the ancestry of the stars. The investigation is based on high-resolution spectra and line-blanketed ...
  • R Coronae Borealis stars at minimum light - UW Cen 
    Kameswara Rao, N; Reddy, B. E; Lambert, D. L (Blackwell Publishing, 2004-12)
    Two high-resolution optical spectra of the R Coronae Borealis (R CrB) star UW Cen in decline are discussed. A spectrum from mid-1992 when the star had faded by 3 mag shows just a few differences with the spectrum at maximum ...

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