• R S Kaushal

      Articles written in Pramana – Journal of Physics

    • Stability of extended scalar diquark stars vis-à-vis soliton stars

      R S Kaushal

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      Motivated by relatively large values of the maximum mass (M = 8.92M⊙) and radius (R = 507 km) obtained for an extended scalar diquark star within the framework of an effective φ4-theory (S K Karnet al [1]) some interesting observations are made with regard to the stability of stellar objects describable in general in terms of the polynomial field theories

    • On diquark clustering in quark—gluon plasma

      A K Sisodiya V S Bhasin R S Kaushal

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      The possibility that pairs of quarks will form diquark clusters in the regime above deconfinement transition for hadron matter at finite density is revisited. Here we present the results on the diquark-diquark (dq-dq) interaction in the framework of constituent quark model taking account of spin, isospin and color degrees of freedom in the spirit of generalized Pauli principle. By constructing the appropriate spin and color states of the dq-dq clusters we compute the expectation values of the interaction Hamiltonian involving pairwise quark—quark interaction. We find that the effective interaction between two diquark clusters is quite sensitive to different configurations characterized by color and spin states, obtained after the coupling of two diquark states. The value of the coupling parameter for a particular color—spin state, i.e., -3, 1 is compared to the one obtained earlier by Donoghue and Sateesh,Phys. Rev.D38, 360 (1988) based on the effective Φ4-theory. This new value of λ derived for different color-spin dq-dq states, may lead to several important implications in the studies of diquark star and diquark gas.

    • Classical and quantum mechanics of complex Hamiltonian systems: An extended complex phase space approach

      R S Kaushal

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      Certain aspects of classical and quantum mechanics of complex Hamiltonian systems in one dimension investigated within the framework of an extended complex phase space approach, characterized by the transformation $x = x_{1} + ip^{2}$, $p = p_{1} + ix_{2}$, are revisited. It is argued that Carl Bender inducted $\mathcal{PT}$ symmetry in the studies of complex power potentials as a particular case of the present general framework in which two additional degrees of freedom are produced by extending each coordinate and momentum into complex planes. With a view to account for the subjective component of physical reality inherent in the collected data, e.g., using a Chevreul (hand-held) pendulum, a generalization of the Hamilton’s principle of least action is suggested.

    • Solitary wave solutions of selective nonlinear diffusion-reaction equations using homogeneous balance method

      Ranjit Kumar R S Kaushal Awadhesh Prasad

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      An auto-Bäcklund transformation derived in the homogeneous balance method is employed to obtain several new exact solutions of certain kinds of nonlinear diffusion-reaction (D-R) equations. These equations arise in a variety of problems in physical, chemical, biological, social and ecological sciences.

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