Black holes below Chandrasekhar mass limit (1.4 $M_{\odot}$) can not be produced via any standard stellar evolution. Recently, gravitational wave experiments have also discovered unusually low black whose origin is yet to known. We propose a simple novel formation mechanism of such holes. Non-annihilating particle dark matter, owing their interaction with nuclei, gradually accumulate inside com...

So far the existence of the dark matter (DM) is our best experimental evidence for new physics beyond the Standard Model. The most recent WMAP data [1] confirm the standard cosmological model and precisely pin down the amount of cold dark matter as 0.094 < ΩCDMh 2 < 0.129, in accord with earlier indications. Nevertheless, the exact nature of the dark matter still remains a mystery, as all known...

A good case can be made for believing that there is a substantial amount of nonbaryonic dark matter in the universe, most likely composed of an as-yet-undiscovered elementary particle. The various candidates for this particle, both front runners and dark horses, are reviewed. Supported by NSF Grant PHY{91{16964.

Quantum black holes are the smallest and heaviest conceivable elementary particles. They have a microscopic size but a macroscopic mass. Several fundamental types have been constructed with some remarkable properties. Quantum black holes in the neighborhood of the Galaxy could resolve the paradox of ultra-high energy cosmic rays detected in Earth’s atmosphere. They may also play a role as dark ...

Numerous lines of evidence indicate that the matter content of the Universe is dominated by some unseen component. Determining the nature of this Dark Matter is one of the most important problems in cosmology. Weakly Interacting Massive Particles (WIMPs) are widely considered to be one of the best candidates which may comprise the Dark Matter. A brief overview of the different methods being use...