923 citations
- Homi Bhabha National InstituteIN173 papers
- Tata Institute of Fundamental ResearchIN31 papers
- Saha Institute of Nuclear PhysicsIN26 papers
- Institute of Mathematical SciencesIN25 papers
- University of CalcuttaIN23 papers
- University of OxfordGB23 papers
- Indian Association for the Cultivation of ScienceIN21 papers
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8 papers · 2 filters
Fractal Dimensions of a Weakly Clustered Distribution and the Scale of Homogeneity
J. S. Bagla, Jaswant Yadav, T. R. Seshadri
Homogeneity and isotropy of the universe at sufficiently large scales is a fundamental premise on which modern cosmology is based. Fractal dimensions of matter distribution is a pa…
The lessons from the running of the tensor-to-scalar ratio
Jinn-Ouk Gong
We derive a simple consistency relation from the running of the tensor-to-scalar ratio. This new relation is first order in the slow-roll approximation. While for single field mode…
Generation of perturbation after multi-field inflation
Jinn-Ouk Gong
We explore a new possibility that some inflaton fields in multi-field inflation models satisfy the observed value of the spectral index so that the curvature perturbation generated…
Multiple scalar particle decay and perturbation generation
Ki-Young Choi, Jinn-Ouk Gong
We study the evolution of the universe which contains a multiple number of non-relativistic scalar fields decaying into both radiation and pressureless matter. We present a powerfu…
Axisymmetric black hole accretion in the Kerr metric as an autonomous dynamical system
Sanghamitra Goswami, Saba Nashreen Khan, Arnab K. Ray +1
In a stationary, general relativistic, axisymmetric, inviscid and rotational accretion flow, described within the Kerr geometric framework, transonicity has been examined by settin…
On the evolution of tachyonic perturbations at super-Hubble scales
Rajeev Kumar Jain, Pravabati Chingangbam, L. Sriramkumar
In the slow-roll inflationary scenario, the amplitude of the curvature perturbations approaches a constant value soon after the modes leave the Hubble radius. However, relatively r…