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排序方式: 共有252条查询结果,搜索用时 15 毫秒
31.
Debajyoti Choudhury Saurabh D. Rindani B. Ananthanarayan K. R. S. Balaji Debajyoti Choudhury Manuel Drees Shashikant Dugad Gautam Dutta Sukanta Dutta Naveen Gaur Ambar Ghosal Walter Grimus Ernest Ma Shubhendra Mohanty P. N. Pandita M. K. Parida Subhendu Rakshit Saurabh D. Rindani D. P. Roy Probir Roy Sarira Sahu N. N. Singh Sudhir K. Vempati Francesco Vissani 《Pramana》1998,51(1-2):305-311
This report summarises the activities of the working group on ‘Physics beyond the Standard Model’. The results of investigations
in incorporatingR-parity in grand unification, the possibility of a light charged Higgs boson in extension of MSSM and radiative generation
of neutral vector boson self-couplings within the MSSM are described. Also given is an account of activities in neutrino physics,
namely a proposal for a study of the atmospheric muon anomaly in deep underground mines, a field theoretic study of neutrino
oscillations and a mechanism to generate appropriate masses of three active plus one sterile neutrino species. 相似文献
32.
33.
R. B. Mann 《Foundations of Physics Letters》1991,4(5):425-449
A relativistic gravitational theory in (1 + 1) dimensions is presented which exhibits many of the qualitative features of (3 + 1)-dimensional general relativity. The field equations are simple enough for undergraduates to solve yet rich enough in structure to form a useful pedagogical example for exploring the qualitative features of relativistic gravitation. Black hole solutions to the field equations of the theory are derived and its relationship to Newtonian gravity is discussed in detail. 相似文献
34.
35.
We calculate the possible interaction between a superconductor and the static Earth’s gravitational fields, making use of the gravito-Maxwell formalism combined with the time-dependent Ginzburg–Landau theory. We try to estimate which are the most favorable conditions to enhance the effect, optimizing the superconductor parameters characterizing the chosen sample. We also give a qualitative comparison of the behavior of high– and classical low– superconductors with respect to the gravity/superfluid interplay. 相似文献
36.
Jagdish Mehra 《Foundations of Physics Letters》1998,11(4):391-393
In what follows, I reply to the preceding article by Michel Janssen and Robert Schulmann, which itself was a response to my article on One month in the history of the discovery of general relativity theory, published in the February 1998 issue of this journal. I stand by the historical analysis and conclusions presented in my original article. 相似文献
37.
M. Pavšič 《Foundations of Physics》2007,37(8):1197-1242
We investigate a theory in which fundamental objects are branes described in terms of higher grade coordinates encoding both the motion of a brane as a whole, and its volume evolution. We thus formulate a dynamics which generalizes
the dynamics of the usual branes. Geometrically, coordinates and associated coordinate frame fields {} extend the notion of geometry from spacetime to that of an enlarged space, called Clifford space or C-space. If we start
from four-dimensional spacetime, then the dimension of C-space is 16. The fact that C-space has more than four dimensions
suggests that it could serve as a realization of Kaluza-Klein idea. The “extra dimensions” are not just the ordinary extra
dimensions, they are related to the volume degrees of freedom, therefore they are physical, and need not be compactified.
Gauge fields are due to the metric of Clifford space. It turns out that amongst the latter gauge fields there also exist higher
grade, antisymmetric fields of the Kalb–Ramond type, and their non-Abelian generalization. All those fields are naturally
coupled to the generalized branes, whose dynamics is given by a generalized Howe–Tucker action in curved C-space. 相似文献
38.
V. V. Obukhov K. E. Osetrin A. E. Filippov Yu. A. Rybalov 《Russian Physics Journal》2009,52(2):170-175
A problem of classification of the conformally flat St?ckel spaces admitting complete separation of variables in the Hamilton–Jacobi
equation is studied within the framework of the Brans–Dicke scalar-tensor gravitational theory. Solutions to the field equations
of the theory are found for the conformally flat St?ckel spaces of type (1.1), and explicit forms of the metric and scalar
field are presented.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 54–58, February, 2009. 相似文献
39.
Yu. M. Loskutov 《Moscow University Physics Bulletin》2009,64(2):103-109
It is shown that the complete system of classical gravitational equations for an isolated centrally symmetric body yields that: (1) in terms of Galilean coordinates all metric coefficients of the Riemannian space induced by the body cannot be equal to zero or infinity anywhere; (2) they, together with the first-order derivatives, should be continuous everywhere. The equations do not contain solutions corresponding to “black holes,” but admit solutions corresponding to objects for which the surface radius (in terms of standard coordinates) is equal to the double mass of matter under this surface. These objects can make the main contribution to the dark matter of the Universe and explain observed effects, such as gravitational microlensing and other effects. Under certain conditions they can become powerful X-ray sources. 相似文献
40.
Current observations indicate that 95% of the energy density in the universe is the unknown dark component.The dark component is considered composed of two fluids:dark matter and dark energy.Or it is a mixture of these two dark components,i.e.,one can consider it an exotic unknown dark fluid.With this consideration,the variable generalized Chaplygin gas(VGCG)model is studied with not dividing the unknown fluid into dark matter and dark energy parts in this paper.By using the Markov Chain Monte Carlo method,the VGCG model as the unification of dark sectors is constrained,and the constraint results on the VGCG model parameters are,n=0.00057+0.0001+0.0009-0.0006-0.0006,α=0.0015+0.0003+0.0017-0.0015-0.0015and B s=0.778+0.016+0.030-0.016-0.035,obtained by the cosmic microwave background data from the 7-year WMAP full data points,the baryon acoustic oscillation data from Sloan Digital Sky Survey(SDSS)and 2-degree Field Galaxy Redshift(2dFGRS)survey,and the Union2 type Ia supernova data with systematic errors.At last,according to the evolution of deceleration parameter it is shown that an expanded universe from deceleration to acceleration can be obtained in VGCG cosmology. 相似文献