11,431 research outputs found

    Stochastic Quantization of Axial Vector Gauge Theories

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    The stochastic quantization scheme proposed by Parisi and Wu in 1981 is known to have differences from conventional quantum field theory in higher orders. It has been suggested that some of these new features might give rise to a mechanism to explain tiny fermion masses as arising due to radiative corrections. In view of importance for need of going beyond the standard model, in this article some features of U(1) axial vector gauge theory in Parisi Wu stochastic quantization scheme are reported. Renormalizability of a massive axial vector gague theory coupled to a massless fermion appears as one of the important conclusions.Comment: 8page

    Quantum Mechanics in Pseudotime

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    Based on some results on reparmetrisation of time in Hamiltonian path integral formalism, a pseudo time formulation of operator formalism of quantum mechanics is presented. Relation of reparametrisation of time in quantum with super symmetric quantum mechanics is established. We show how some important concepts such as shape invariance and tools like isospectral deformation appear in pseudo time quantum mechanics.Comment: 20 pages,22 Reference


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    We briefly review a hamiltonian path integral formalism developed earlier by one of us. An important feature of this formalism is that the path integral quantization in arbitrary co-ordinates is set up making use of only classical hamiltonian without addition of adhoc 2\hbar^2 terms. In this paper we use this hamiltonian formalism and show how exact path integration may be done for several potentials.Comment: LATEX, 35 Pages , compile twice to get equation numbers correct, No Figures

    Hamiltonian path integral quantization in polar coordinates

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    Using a scheme proposed earlier we set up Hamiltonian path integral quantization for a particle in two dimensions in plane polar coordinates.This scheme uses the classical Hamiltonian, without any O(2)O(\hbar^2) terms, in the polar varivables. We show that the propagator satisfies the correct Schr\"{o}dinger equation.Comment: 15 pages, latex, no figure

    Local Scaling of Time in Hamiltonian Path Integration

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    Inspired by the usefulness of local scaling of time in the path integral formalism, we introduce a new kind of hamiltonian path integral in this paper. A special case of this new type of path integral has been earlier found useful in formulating a scheme of hamiltonian path integral quantization in arbitrary coordinates. This scheme has the unique feature that quantization in arbitrary co-ordinates requires hamiltonian path integral to be set up in terms of the classical hamiltonian only, without addition of any adhoc O(2) O(\hbar ^2) terms. In this paper we further study the properties of hamiltonian path integrals in arbitrary co-ordinates with and without local scaling of time and obtain the Schrodinger equation implied by the hamiltonian path integrals. As a simple illustrative example of quantization in arbitrary coordinates and of exact path integration we apply the results obtained to the case of Coulomb problem in two dimensions.Comment: LATEX, Compile twice to get equation numbers correct, 27 Pages, No Figures

    Newton's Equation on the kappa space-time and the Kepler problem

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    We study the modification of Newton's second law, upto first order in the deformation parameter aa, in the κ\kappa-space-time. We derive the deformed Hamiltonian, expressed in terms of the commutative phase space variables, describing the particle moving in a central potential in the κ\kappa-space-time. Using this, we find the modified equations of motion and show that there is an additional force along the radial direction. Using Pioneer anomaly data, we set a bond as well as fix the sign of aa. We also analyse the violation of equivalence principle predicted by the modified Newton's equation, valid up to first order in aa and use this also to set an upper bound on aa.Comment: 8 pages, Minor changes in subsection III A made for clarity, to appear in Mod. Phys. Lett.

    Construction of 2nd stage shape invariant potentials

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    We introduce concept of next generation shape invariance and show that the process of shape invariant extension can be continued indefinitely.Comment: 5 page

    Coefficient Estimates for Inverses of Starlike Functions of Positive Order

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    In the present paper, the coefficient estimates are found for the class S1(α)\mathcal S^{*-1}(\alpha) consisting of inverses of functions in the class of univalent starlike functions of order α\alpha in D={zC:z<1}\mathcal D=\{z\in\mathbb C:|z|<1\}. These estimates extend the work of {\it Krzyz, Libera and Zlotkiewicz [Ann. Univ. Marie Curie-Sklodowska, 33(1979), 103-109]} who found sharp estimates on only first two coefficients for the functions in the class S1(α)\mathcal S^{*-1}(\alpha). The coefficient estimates are also found for the class 1(α)\sum^{*-1}(\alpha), consisting of inverses of functions in the class (α)\sum^*(\alpha) of univalent starlike functions of order α\alpha in V={zC:1<z<}\mathcal V=\{z\in\mathbb C:1<|z|<\infty\}. The open problem of finding sharp coefficient estimates for functions in the class (α)\sum^*(\alpha) stands completely settled in the present work by our method developed here.Comment: 12 page

    Non-Commutative space-time and Hausdorff dimension

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    We study the Hausdorff dimension of the path of a quantum particle in non-commutative space-time. We show that the Hausdorff dimension depends on the deformation parameter aa and the resolution Δx\Delta x for both non-relativistic and relativistic quantum particle. For the non-relativistic case, it is seen that Hausdorff dimension is always less than two in the non-commutative space-time. For relativistic quantum particle, we find the Hausdorff dimension increases with the non-commutative parameter, in contrast to the commutative space-time. We show that non-commutative correction to Dirac equation brings in the spinorial nature of the relativistic wave function into play, unlike in the commutative space-time. By imposing self-similarity condition on the path of non-relativistic and relativistic quantum particle in non-commutative space-time, we derive the corresponding generalised uncertainty relation.Comment: 16 pages, 3 figures, minor changes, to appear in IJMP

    Uniformly accelerating observer in κ\kappa-deformed space-time

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    In this paper, we study the effect of κ\kappa-deformation of the space-time on the response function of a uniformly accelerating detector coupled to a scalar field. Starting with κ\kappa-deformed Klein-Gordon theory, which is invariant under a κ\kappa-Poincar\'e algebra and written in commutative space-time, we derive κ\kappa-deformed Wightman functions, valid up to second order in the deformation parameter aa. Using this, we show that the first non-vanishing correction to the Unruh thermal distribution is only in the second order in aa. We also discuss various other possible sources of aa-dependent corrections to this thermal distribution.Comment: 12 pages, minor changes, to appear in Phys. Rev.