Physics

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Shiv Nadar University

(SoNS) School of Natural Sciences

Physics Letters A

Covariance of spontaneous symmetry breaking in non-inertial frames

This letter examines the thermodynamics of black holes in case of a varying gravitational constant. We find that the second law of thermodynamics may remain valid contrary to the opinions expressed by some. © 1983.

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Physics Letters B

Temperature dependent gravitational constant and black hole physics

Physical Review D

Isospin violation and tensor-glueball decay

We obtain, by making use of the anomaly term in the divergence of the flavor-singlet axial-vector-current, new spectral-function sum rules for the pseudoscalar density in a chiral-SU(3) × SU(3) × U3(1) framework. The positivity conditions on the spectral representations of the pseudoscalar densitites lead to a new bound on the quark-condensate term 0|q»q|0<-(279 MeV)3 (q=u, d, and s) corresponding to bare-current-quark values of mu=md5 MeV and m150 MeV. © 1983 The American Physical Society.

Strong anomaly, spectral-density sum rules, and broken U(3)×U(3) symmetry

This paper discusses resonances of narrow width in the context of bound states embedded in the continuum spectrum of nonlocal potentials. Feshbach's theory of nuclear reactions leads directly to resonance theory, and we base our discussion here on the techniques he developed for shifting nuclear many-body aspects into effective single-particle nonlocal potentials. In our formulation, the many-body state of the compound nucleus is represented by a single-particle state. The basis for our discussion is a two channel model of a resonance of zero width, with a continuum bound state originating from the coupling of a bound state to the single-particle scattering state. We give a specific example of a model which leads to an arbitrarily narrow (nonzero width) resonance, and demonstrate that the width of the resonance produced by breaking the continuum bound state is proportional to (Λ-1)2, where the parameter Λ is such that Λ=1 corresponds to the condition necessary for the existence of a continuum bound state. NUCLEAR REACTIONS Compound nucleus resonances, coupled channels, nonlocal potentials, coutinuum bound states, Breit-Wigner formula. © 1982 The American Physical Society.

Physical Review C

Nonlocal potentials and resonances of narrow width

In this letter, we observe that if the E(1440) is identified as a glueball with pseudoscalar quantum numbers then its decay width can be significantly large, about as broad as that of the ρ{variant} meson, if not more. However, the possiblity of a narrow width cannot be rigorously ruled out. We also examine the sensitivity of the decay widths to the off-shell corrections as well as to the sign of the intermediate coupling constants. © 1982.

More on meson decays of glueballs

η-π0 mixing and ψ′ → ψπ0 decay

We consider the effects of η-π mixing on the violation of the |ΔI|=1/2 rule in |ΔS|=1 weak transitions. The processes considered are the K→2 π, K→3 π, Λ, Ξ and Λ hyperon decays. © 1981 the Indian Academy of Sciences.