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The Chandrasekhar limit for quark stars is evaluated from simple energy balance relations, as proposed by Landau for white dwarfs or neutron stars. It has been found that the limit for quark stars depends on, in addition to the fundamental constants, the Bag constant. Compact objects like the white dwarfs and neutron stars have been a topic of interest for… (More)

- Abhijit Chatterjee, Anandamay Adak, +5 authors Sibaji Raha
- PloS one
- 2010

BACKGROUND
There is an urgent need for an improved understanding of the sources, distributions and properties of atmospheric aerosol in order to control the atmospheric pollution over northeastern Himalayas where rising anthropogenic interferences from rapid urbanization and development is becoming an increasing concern.
METHODOLOGY/PRINCIPAL FINDINGS
An… (More)

An extended version of the Zimanyi-Moskowski (ZM) model has been used to calculate the temperature dependence of the hadronic masses. The calculation of meson masses in the Random Phase Approximation (RPA) gives an increase in the σ, ω and π effective masses with temperature. PACS No: 21.65.+f, 24.10.Jv Email : phys@boseinst.ernet.in Email :… (More)

a Physics Department, Bose Institute, 93/1, A.P.C. Road, Calcutta 700 009, INDIA b Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Calcutta 700 064, INDIA c Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. V6T 2A3, CANADA d Nuclear Theory Group, Brookhaven National Laboratory, Bldg. 510A, Upton, Long Island, New York 11973-5000, USA e Saha… (More)

- Abhijit Bhattacharyya, Jan-e Alam, +5 authors Bidhan Nagar
- 1999

We calculate the size distribution of quark nuggets, which could be formed due to first order QCD phase transition in the early universe. We find that there are a large number of stable Quark Nuggets which could be a viable candidate for cosmological dark matter.

- Jan-e Alam, Pradip Roy, Sourav Sarkar, Sibaji Raha, Bikash Sinha, Bidhan Nagar
- 1996

We apply the momentum integrated Boltzmann transport equation to study the time evolution of various quark flavours in the central region of ultra-relativistic heavy ion collisions. The effects of thermal masses for quarks and gluons are incorporated to take into account the in-medium properties of these ingredients of the putative quark gluon plasma. We… (More)

The Jacobi polynomial has been advocated by many authors as a useful tool to evolve non-singlet structure functions to higher Q2. In this work, it is found that the convergence of the polynomial sum is not absolute, as there is always a small fluctuation present. Moreover, the convergence breaks down completely for large N . [PACS : 12.38.-t, 12.38.Bx,… (More)

There have been several reports of exotic nuclear fragments, with highly unusual charge to mass ratio, in cosmic ray experiments. Although there exist experimental uncertainties which make them, at best, only candidate ”exotic” events, it is important to understand what they could be, if they are eventually confirmed. Among other possible explanations, some… (More)

The variation of kaon mass in dense, charge-neutral baryonic matter at betaequilibrium has been investigated. The baryon interaction has been included by means of nonlinear Walecka model, with and without hyperons and the interaction of kaons with the baryons has been incorporated through the Nelson-Kaplan model. A selfconsistant, one-loop level calculation… (More)

Pion dissociation in a medium of hot quark matter is studied. The decay width of pion is found to be large but finite at temperatures much higher than the so called critical temperature of chiral or deconfinement transition. Consequently, pions should coexist with quarks and gluons at such high temperatures. The result is in agreement with the lattice… (More)