A radiating dyon solution

We give a non-static exact solution of the Einstein-Maxwell equations (with null fluid), which is a non-static magnetic charge generalization to the Bonnor-Vaidya solution and describes the gravitational and electromagnetic fields of a nonrotating massive radiating dyon. In addition, using the energy-momentum pseudotensors of Einstein and Landau and Lifshitz we obtain the energy, momentum, and power output of the radiating dyon and find that both prescriptions give the same result.Comment: 9 pages, LaTe

Some Novel Contributions to Radiative B Decay in Supersymmetry without R-parity

We present a systematic analysis at the leading log order of the influence of combination of bilinear and trilinear R-parity violating couplings on the decay b-->s gamma. Such contributions have never been explored in the context of this decay. We show that influence of charged-slepton-Higgs mixing mediated loops can dominate the SM and MSSM contributions and hence can provide strong bounds on the combination of bilinear-trilinear R-parity violating couplings. Such contributions are also enhanced by large tan beta. With substantially extended basis of operators (28 operators), we provide illustrative analytical formulae of the major contributions to complement our complete numerical results which demonstrate the importance of QCD running effects.Comment: 4 pages, 2 figure

Radiative spacetimes approaching the Vaidya metric

We analyze a class of exact type II solutions of the Robinson-Trautman family which contain pure radiation and (possibly) a cosmological constant. It is shown that these spacetimes exist for any sufficiently smooth initial data, and that they approach the spherically symmetric Vaidya-(anti-)de Sitter metric. We also investigate extensions of the metric, and we demonstrate that their order of smoothness is in general only finite. Some applications of the results are outlined.Comment: 12 pages, 3 figure

Mixed potentials in radiative stellar collapse

We study the behaviour of a radiating star when the interior expanding, shearing fluid particles are traveling in geodesic motion. We demonstrate that it is possible to obtain new classes of exact solutions in terms of elementary functions without assuming a separable form for the gravitational potentials or initially fixing the temporal evolution of the model unlike earlier treatments. A systematic approach enables us to write the junction condition as a Riccati equation which under particular conditions may be transformed into a separable equation. New classes of solutions are generated which allow for mixed spatial and temporal dependence in the metric functions. We regain particular models found previously from our general classes of solutions.Comment: 10 pages, To appear in J. Math. Phy

The Tolman-Bondi--Vaidya Spacetime: matching timelike dust to null dust

The Tolman-Bondi and Vaidya solutions are two solutions to Einstein equations which describe dust particles and null fluid, respectively. We show that it is possible to match the two solutions in one single spacetime, the Tolman-Bondi--Vaidya spacetime. The new spacetime is divided by a null surface with Tolman-Bondi dust on one side and Vaidya fluid on the other side. The differentiability of the spacetime is discussed. By constructing a specific solution, we show that the metric across the null surface can be at least $C^1$ and the stress-energy tensor is continuous.Comment: 5 pages, no figur

A comparison of the criteria of emotional maturity in an eastern and a western culture

The problem of the thesis was to compare experimentally the concepts of a mature individual of groups of two cultures in order to test the hypothesis that the criteria of emotional maturity are, at least in part, culturally determined. Chapter I examines the concept of emotional maturity as it appears in the psychological literature. A brief survey of the various ways in which the term is used indicates that the term is still left vague and ill defined. A fresh approach to the term is suggested. Chapter II examines some of the earlier attempts to assess the emotional maturity or neurotic tendency of one cultural group by means of a test prepared in another cultural setting. Such comparisons generally reveal the inadequacies of the measuring instrument itself. The questionnaire used in the experiment is discussed in the third chapter together with the descriptions of the British and the Hindu groups studied. The next four chapters are devoted to the analysis of the answers of the subjects. It appears from the subgroup comparisons that there were no significant sex-differences; however, the two age groups in each culture differed significantly on some items. For the intergroup comparisons, the items of the questionnaire are divided into twelve sections and the opinions of five pairs of groups on each item are compared. Chapter VI summarizes the findings of the previous chapter in the form of composite pictures of a mature and an immature individual for each of the groups. Chapter VII analyses the criticisms of the questionnaire received from the subjects, as these criticisms form an integral part of the data. Comparisons are also made here between the extent of response given by various groups. In the last chapter an attempt is made to examine the Hindu concept of a mature man as revealed in this investigation in the light of the Hindu culture-pattern.<p