IUCAA Preprints

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    Signal analysis of the gravitational waveform of pulsars
    (2015-01-17) Jotania, Kanti; Dhurandhar, S.V.; Valluri, S.R.
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    Response of the interferometric antenna to gravitational radiation from pulsars
    (2015-01-13) Jotania, Kanti; Dhurandhar, S.V.
    We present here a full calculation of the response of a laser interferometric gravitational wave detector on which gravitational radiation from a continuous source is incident. The observation time is taken to be of the order of few months. The long observation time implies that the motion of the detector is important and must be included in the response as a modulation effect. For simplicity we consider only two motions of the Earth , namely the rotation of the Earth about axis and the orbital motions about the sun. The orbit is assumed to be circular. We consider the detector to be situated and oriented arbitrarily on the Earth, except that we assume the arms of the detector must lie in the tangent plane to the Earth at the point where the detector is situated. The gravitational wave incident on the detector is assumed to be a plane wave having arbitrary direction and polarization. We also present here the computation of the quadrupole wave form of a typical continuous source – a pulsar-which is modelled as an almost spherical object of uniform density, spinning about an arbitrary axis with uniform angular velocity. We use techniques of spherical tensors and Gel’fandfunction developed in the literature to compute the waveform
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    Cylindrically symmetric inhomogeneous cosmological models with viscous fluid & varying /\>
    (2012-07-06) Pradhan, A.; Singh, P. K.; Jotania, Kanti
    Cylindrically symmetric non-static cosmological models representing a bulk viscous fluid distribution have been obtained which are inhomogeneous and anisotropic. Without assuming any adhoc law, we obtain a cosmological constant as a decreasing function of time. Various physical and geometrical features of the models are also discussed.
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    On relativistic models of strange stars
    (2006-01-01) Tikekar, R.; Jotania, Kanti
    The superdense stars with mass to size ratio greater than 0.3 are expected to be made up of strange matter. The ansatz prescrbing ge- ometry of a 3-paraboloid immersed in 4-dimensional Euclidean space for the 3-space of the interior spacetime of superdense star is shown to provide two parameter family of physically viable relativistic models of strange stars. The compact stellar con gurations with mass to size ratio greater than 0.3 are likely to admit only strange star interpretation.