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Saha Theory Workshop: Cosmology at the Interface

28–30 Jan 2015
Asia/Calcutta timezone

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Session

Dark Energy-II

29 Jan 2015, 15:45

Conveners

Dark Energy-II

  • Debashis Majumdar

Presentation materials

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  1. 50. Current Cosmic Acceleration with Slotheon
    Dr Amna Ali (SINP,Kolkata)
    29/01/2015, 15:45
    Contributory Talks
    I will discuss the cosmological viability of a slow-moving Galileon field in a potential. The Slotheon Lagrangian respects the Galileon symmetry in curved spacetime. I will carry out the detailed investigations of the underlying dynamics of this Lagrangian with an Einstein-Hilbert term and a potential. I will demonstrate that the model can give rise to a viable ghost-free late-time...
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  2. 45. Gravitational Lensing Bound on The Transition Redshift
    Ms Nisha Rani (Delhi University)
    29/01/2015, 16:00
    Contributory Talks
    In this paper, we use the approach which is independent on matter, to study the accelerated expansion of the Universe. We reconsttruct the deceleration parameter, q(z), to put constrain on the transition redshift $(z_t )$. Transition redshift is the value of redshift at which the expansion of the Universe switches from decelerated to accelerated phase. We reconstruct three different form of...
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  3. 47. Geometry of the universe described by wet dark fluid in f(R, T) theory of gravity
    Dr Gauranga Charan Samanta (Birla Institute of Technology and Science, Pilani, K k Birla, Goa Campus)
    29/01/2015, 16:15
    Contributory Talks
    The Bianchi type-III cosmological model in gravity is investigated with the equation of state for wet dark fluid i.e. $P_{WDF}=\omega (\rho_{WDF}-\rho^*)$. Using Volumetric and power law expansion we obtained the exact solution of the field equations. The various astrophysical phenomena namely the look back time, proper distance, luminosity distance, Angular diameter, jerk parameter and...
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  4. 21. Pressure anisotropy and dark energy models in scale invariant theory of gravitation
    Dr Bivudutta Mishra (BITS-Pilani, Hyderabad Campus)
    29/01/2015, 16:30
    Contributory Talks
    The problem of an anisotropic universe in the form of a diagonal Bianchi type V space-time is investigated in scale invariant theory with dark energy. The matter field is considered in the form of perfect fluid. Pressure anisotropy is considered along different spatial directions. From the constructed cosmological models, we found a dynamic pressure anisotropy which continues along with the...
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  5. 20. High-z Supernova Type Ia Data: non-Gaussianity and Direction Dependence
    Mr Meghendra Singh Mr. (UPTU Lucknow)
    29/01/2015, 16:45
    Contributory Talks
    We use the ∆χ2 statistic introduced in Gupta, Saini & Laskar (2008); Gupta, Saini (2010) to study directional dependence, in the high-z supernovae data. This depen- dence could arise due to departures from the cosmological principle or from direc- tion dependent statistical systematics in the data. We apply our statistic to the gold data set from Riess et al. (2004) and Riess et al....
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  6. 39. Effect of phantom dark energy on Gravitational Lensing
    Dr Kabita Sarkar (Salesian College, Siliguri)
    29/01/2015, 17:00
    Contributory Talks
    Abstract: Recent cosmological observations suggest that the accelerated expansion of the universe is governed by dark energy with the equation of state parameter (w) restricted to the range -1.38 < w < -0.82. This indicates the possibility of dark energy with w < -1. A phantom scalar is regarded as an effective field description of such dark energy component. In the present work we have...
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