Decay of the inflaton or moduli which dominated the energy density of the universe at early times leads to a matter to radiation transition epoch. We consider nonthermal sterile dark matter (DM) particles produced as decay ...
The
Λ
CDM
prediction of
S
8
≡
σ
8
(
Ω
m
/
0.3
)
0.5
—where
σ
8
is the root mean square of matter fluctuations on an
8
h
−
1
Mpc
scale—once calibrated on Planck cosmic microwave ...
We present small-scale structure constraints on sterile dark matter produced from a heavy mediator particle, inspired by models of moduli decay. Dark matter particles produced through this mechanism can contribute to the ...
Niwas, S; Gupta, P. K; Gaur, V. K(Indian Academy of Sciences, 2005-10)
This paper investigates the performance of normalized response function obtained by normalizing the Cagniard impedance function by a suitable factor and then rotating the phase by 45 ◦to make it purely real for homogeneous ...
Using Greenwich and Solar Optical Observing Network sunspot group data obtained during the period 1874-2005, we find that the sums of the areas of the sunspot groups in the 0°-10° latitude-interval of the Sun's northern ...
Iijima, T; Gehrz, R. D; Jones, T. J; Lawrence, G; Sivaraman, K. R; Prabhu, T. P; Ghosh, K. K; Anupama, G. C; Selvakumar, G(Smithsonian Astrophysical Observatory, 1991-04)
Kamath, U. S; Ashok, N. M; Anupama, G. C(Astronomical Society of India, 2008-12)
We present near-infrared and optical spectra of the fast nova V4444 Sagittarii at two single epochs in the early decline phase and unfiltered images obtained in quiescence. Based on this and other available data, we discuss ...
Nagabhushana, S; Nagesh, Suresh; Prasad, B. R(World Scientific, 2021-06)
There is a continuous need to enhance the aperture size of telescopes by astronomers to explore the space
much deeper by getting better resolutions and high image quality. Supporting large optics and maintaining
high ...
Akanksha, K; Pravabati, C; Appleby, S; Park, C(IOP Publishing, 2018-10)
We employ the rank-2 contour Minkowski tensor in two dimensions to probe length and time scales of ionized bubbles during the epoch of reionization. We demonstrate that ionized bubbles are not circular, and hence not ...
Rajamohan, R(Indian Institute of Astrophysics, Bangalore, 1977)
Spectroscopic observations of the single-lined binary, NU Centauri during the years 1968-1972 were utilised to derive fresh orbital elements of this system. The measured radial velocities indicate that the primary component ...
It is argued that the occurrence of nuclear activity and supernovae in E and S0 galaxies are correlated and a result of accretion of gas by the galaxy.