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16 papers · 1 filter
The dispersion of growth of matter perturbations in f(R) gravity
Shinji Tsujikawa, Radouane Gannouji, Bruno Moraes +1
We study the growth of matter density perturbations delta_m for a number of viable f(R) gravity models that satisfy both cosmological and local gravity constraints, where the Lagra…
A Multifrequency Study of Double-Double Radio Galaxies
M. Jamrozy, C. Konar, D. J. Saikia +1
One of the striking examples of episodic activity in active galactic nuclei are the double-double radio galaxies (DDRGs) with two pairs of oppositely-directed radio lobes from two…
Spectral Ages of Giant Radio Sources
C. Konar, D. J. Saikia, M. Jamrozy +1
Multifrequency observations with the GMRT and the VLA are used to determine the spectral breaks in consecutive strips along the lobes of a sample of selected giant radio sources (G…
Possible Relic Lobes in Giant Radio Sources
S. Godambe, C. Konar, D. J. Saikia +1
We present low-frequency observations with the GMRT of three giant radio sources (J0139+3957, J0200+4049 and J0807+7400) with relaxed diffuse lobes which show no hotspots and no ev…
Search for gravitational wave ringdowns from perturbed black holes in LIGO S4 data
The LIGO Scientific Collaboration, B. Abbott
According to general relativity a perturbed black hole will settle to a stationary configuration by the emission of gravitational radiation. Such a perturbation will occur, for exa…
Path integral duality modified propagators in spacetimes with constant curvature
Dawood Kothawala, L. Sriramkumar, S. Shankaranarayanan +1
The hypothesis of path integral duality provides a prescription to evaluate the propagator of a free, quantum scalar field in a given classical background, taking into account the…