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Saha Theory Workshop: Cosmology at the Interface

28–30 Jan 2015
Asia/Calcutta timezone

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Session

Formal/Dark Energy

29 Jan 2015, 15:45

Conveners

Formal/Dark Energy

  • Golam Hossain

Presentation materials

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  1. 33. Horizon dynamics induced by charged and rotating object
    Dr Srijit Bhattacharjee (IIT Gandhinagar)
    29/01/2015, 15:45
    Contributory Talks
    We study the perturbation induced by a slowly rotating massive object as it passes through a Rindler horizon. It is shown that the passage of this object effectively induces a process which can be approximately modeled as Delta function type tidal distortions hitting the horizon. Further, following the analysis presented by Amsel, Marolf and Virmani related to the issue of the validity of...
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  2. 28. A simple solution to the fine tuning problem of the cosmological constant
    Mr GOPAL Kashyap (IIT KANPUR)
    29/01/2015, 16:00
    Contributory Talks
    We show that the fine tuning problem of the cosmological constant can be solved in a conformal model, with explicit conformal symmetry breaking. We argue that the model has two different terms which essentially contribute to the cosmological constant. A local conformal transformation leads to a cancellation of these two terms among one another. Hence these produce no physical consequence...
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  3. 40. A Singularity Free Cosmological Model in General Relativity
    Dr Shibesh Kumar Jas Pacif Pacif (Manipal University Jaipur)
    29/01/2015, 16:15
    Contributory Talks
    A singularity free cosmological model is obtained in a homogeneous and isotropic background with a specific form of the Hubble parameter in the presence of an interacting dark energy represented by a time-varying cosmological constant in general relativity. Different cases so arose have extensively been studied for different values of curvature parameter. Some interesting results have...
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  4. 41. STRNGE STARS IN KRORI BARUA SPACE-TIME
    Ms INDRANI KARAR (SAROJ MOHAN INSTITUTE OF TECHNOLOGY, GUPTIPARA, HOOGHLY)
    29/01/2015, 16:30
    Contributory Talks
    The singularity free spacetime metric described by Krori-Barua (J. Phys. A, Math. Gen. 8:508, 1975) satisfies all the requirements of a realistic star. Consequently, we explore the possibility of applying the Krori and Barua model to describe ultra-compact objevts like strange stars.
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  5. 48. Influence of cosmological expansion on the local accretion phenomena in galaxies
    Dr Arunava Bhadra (University of North Bengal)
    29/01/2015, 16:45
    Contributory Talks
    Importance of the late time accelerated expansion of the Universe in the study of astrophysical phenomena in local galactic-scales is highlighted. From the principle of conserved Hamiltonian of the test particle motion a three dimensional Newtonian analogous potential has been obtained in spherical geometry corresponding to Schwarzschild de Sitter space time, that reproduces almost all of the...
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