We test the statistical isotropy (SI) of the E -mode polarization of the cosmic microwave background (CMB) radiation observed by the Planck satellite using two statistics, namely, the α estimator that is derived ...

We use state-of-the-art measurements of the galaxy luminosity function (LF) at z = 6, 7, and 8 to derive constraints on warm dark matter (WDM), late-forming dark matter, and ultralight axion dark matter models alternative ...

Einstein`s theory which correctly describes gravity at long distances (low energies) is first compared with Fermi`s theory, which describes weak interactions at low energies. Analogous to strong interactions at high energies ...

The problem of the Universe emerging out of the Planck epoch is discussed. It is pointed out that an earlier exponential expansion phase well before the onset of the GUTs phase transition is essential. Such an expansion ...

Attempts to detect gravitational waves is actively in progress with sophisticated devices like LIGO setup across continents. Despite being predicted almost 100 years ago, there has so far been no direct detection of these ...

We consider through the equivalence principle the existence of maximal and minimal field strengths in gravitation. We explore the consequences for gravitational collapse and for explaining the rotation curve of galaxies ...

This book gives an exposition of both the old and new results of spin and torsion effects on gravitational interactions with implications for particle physics, cosmology etc. Physical aspects are stressed and measurable ...