منابع مشابه
Fluid Observers and Tilting Cosmology
We study perfect fluid cosmological models with a constant equation of state parameter γ in which there are two naturally defined time-like congruences, a geometrically defined geodesic congruence and a non-geodesic fluid congruence. We establish an appropriate set of boost formulae relating the physical variables, and consequently the observed quantities, in the two frames. We study expanding ...
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Flat space-time has not heretofore been thought a suitable locus in which to construct model universes because of the presumed necessity of incorporating gravitation in such models and because of the historical lack of a theory of gravitation in flat spacetime. It is here shown that a Lorentz-invariant theory of gravitation can be formulated by incorporating in it the mass-energy relation. Such...
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According to the Sthapatya Veda (the Indian tradition of architecture), the temple and the town should mirror the cosmos. The temple architecture and the city plan are, therefore, related in their conception. Volwahsen (2001) has remarked on the continuity in the Indian architectural tradition. The Harappan cities have a grid plan, just as is recommended in the Vedic manuals. The square shape r...
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The effects of noncommutativity and deformed Heisenberg algebra on the evolution of a two dimensional minisuperspace quantum cosmological model are investigated.
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The purpose of this paper is to present a model of a ‘quantum space-time’ in which the global symmetries of space-time are unified in a coherent manner with the internal symmetries associated with the state space of quantum-mechanics. If we take into account the fact that these distinct families of symmetries should in some sense merge and become essentially indistinguishable in the unified reg...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20010952