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13 papers · 1 filter
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…
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…
Critical properties of spherically symmetric black hole accretion in Schwarzschild geometry
Ipsita Mandal, Arnab K. Ray, Tapas Kumar Das
The stationary spherically symmetric accretion flow in the Schwarzschild metric has been set up as an autonomous first-order dynamical system, and it has been studied completely an…
Intra-night Optical Variability of Luminous Radio Quiet QSOs
A. C. Gupta, U. C. Joshi
In the present paper we report the detection of intra-night variability in some of the RQQSOs and one LDQ. To study intra-night variability, we carried out photometric monitoring o…
Pseudo-Schwarzschild Spherical Accretion as a Classical Black Hole Analogue
Surajit Dasgupta, Neven Bilić, Tapas K. Das
We demonstrate that a spherical accretion onto astrophysical black holes, under the influence of Newtonian or various post-Newtonian pseudo-Schwarzschild gravitational potentials,…