594 citations · 3.1k across the 88 of their papers we have counts for
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Geometry of deformations of branes in warped backgrounds
Supratik Pal, Sayan Kar
The `braneworld' (described by the usual worldvolume action) is a D dimensional timelike surface embedded in a N dimensional () warped, nonfactorisable spacetime. We first add…
Probing liquid surface waves, liquid properties and liquid films with light diffraction
Tarun Kr. Barik, Partha Roy Chaudhuri, Anushree Roy +1
Surface waves on liquids act as a dynamical phase grating for incident light. In this article, we revisit the classical method of probing such waves (wavelengths of the order of mm…
A novel braneworld model with a bulk scalar field
Ratna Koley, Sayan Kar
We consider a new braneworld model with a bulk scalar field coupled to gravity. The bulk scalar action is inspired by the proposed low energy effective action around the tachyon va…
Can the rotation of the dark matter halo of our galaxy be detected through its effect on the cosmic microwave background polarisation?
Partha Nag, Somnath Bharadwaj, Sayan Kar
The proposition that dark matter halos possess angular momentum, though widely accepted, is a theoretical prediction which has, till date, not been observationally verified. The gr…
Cosmology with decaying tachyon matter
A. Das, Shashikant Gupta, Tarun Deep Saini +1
We investigate the case of a homogeneous tachyon field coupled to gravity in a spatially flat Friedman-Robertson-Walker spacetime. Assuming the field evolution to be exponentially…
The Ellis wormhole with `tachyon matter'
A. Das, Sayan Kar
The Ellis wormhole is known to be an exact solution of the Einstein--scalar system where the scalar field has negative kinetic energy (phantom). We show here that the same geometry…