Adiabatic index of hot and cold compact objects

Cold Dark Matter as Compact Composite Objects

Dark Matter (DM) being the vital ingredient in the cosmos, still remains a mystery. Standard assumption is that the collisionless cold dark matter (CCDM) particles are represented by some weakly interacting fundamental fields which can not be associated with any standard quarks or leptons. However, recent analyses of structure on galactic and sub-galactic scales have suggested discrepancies and...

Cold and hot.

Detecting gravitational waves from precessing binaries of spinning compact objects: Adiabatic limit

Black-hole ~BH! binaries with single-BH masses m5(5220)M ( , moving on quasicircular orbits, are among the most promising sources for first-generation ground-based gravitational-wave ~GW! detectors. Until now, the development of data-analysis techniques to detect GWs from these sources has been focused mostly on nonspinning BHs. The data-analysis problem for the spinning case is complicated by ...

Multi fluidity and Solitary wave stability in cold quark matter: core of dense astrophysical objects

Considering the magneto-hydrodynamic equations in a non-relativistic multi uid framework, we study the behavior of small amplitude perturbations in cold quark matter. Magneto-hydrodynamic equations, along with a suitable equation of state for the cold quark matter, are expanded using the reductive perturbation method. It is shown that in small amplitude approximation, such a medium should be co...

Hot & Cold Working

Q.1. What is hot working ? State its principles, advantages and disadvantages. Ans. Mechanical working of metals above its recrystallisation temperature is known as hot working. Advantages : 1. Larger deformation can be accomplished and more rapidly by hot working since the metal is in plastic state. 2. Porosity of the metal is considerably minimised. 3. Concentrated impurities, if any in the m...