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- Indian Institute of Technology GandhinagarIN282 papers
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5 papers · 2 filters
Cosmological Parallax--Distance Formula
Ashok K. Singal
The standard cosmological parallax--distance formula, as found in the literature, including text-books and reference books on cosmology, requires a correction. This correction stem…
Maximum Brightness Temperature of an Incoherent Synchrotron Source : Inverse Compton Limit - a Misnomer
Ashok K. Singal
We show that an upper limit of ~ 10^{12} K on the peak brightness temperature for an incoherent synchrotron radio source, commonly referred to in the literature as an inverse Compt…
Maximum brightness temperature for an incoherent synchrotron radio source
Ashok K. Singal
We discuss here a limit on the maximum brightness temperature achievable for an incoherent synchrotron radio source. This limit, commonly referred to in the literature as an invers…
Constraints on background torsion from birefringence of CMB polarization
Moumita Das, Subhendra Mohanty, A. R. Prasanna
We show that a non-minimal coupling of electromagnetism with background torsion can produce birefringence of the electromagnetic waves. This birefringence gives rise to a B-mode po…
Non-Gaussianity as a signature of thermal initial condition of inflation
Suratna Das, Subhendra Mohanty
We study non-Gaussianities in the primordial perturbations in single field inflation where there is radiation era prior to inflation. Inflation takes place when the energy density…