John Friedmann (1926–2017)
نویسندگان
چکیده
منابع مشابه
Highly Excited Friedmann Universe
A highly excited Friedmann universe filled with a scalar field and radiation has been considered. On the basis of a direct solution to the quantum-mechanical problem with a well-defined time variable, it has been shown that such a universe can have features (energy density, scale factor, Hubble constant, density parameter, matter mass, equivalent number of baryons, age, dimensions of large-scal...
متن کاملA modified Friedmann equation
We recently formulated a model of the universe based on an underlying W3symmetry. It allows the creation of the universe from nothing and the creation of baby universes and wormholes for spacetimes of dimension 2, 3, 4, 6 and 10. Here we show that the classical large time and large space limit of these universes is one of exponential fast expansion without the need of a cosmological constant. U...
متن کاملFriedmann-robertson-walker Cosmologies
Abstract. Electrodynamics for self-interacting scalar fields in spatially flat FriedmannRobertson-Walker space-times is studied. The corresponding one-loop field equation for the expectation value of the complex scalar field in the conformal vacuum is derived. For exponentially expanding universes, the equations for the Bogoliubov coefficients describing the coupling of the scalar field to grav...
متن کاملFriedmann-lemaˆıtre-robertson-walker Cosmology
Distance–redshift relations are given in terms of associated Legendre functions for partially filled beam observations in spatially flat Friedmann-Lemaˆıtre-Robertson-Walker (FLRW) cosmologies. These models are dynamically pressure-free, flat FLRW on large scales but, due to mass inhomogeneities, differ in their optical properties. The partially filled beam area-redshift equation is a Lame ′ eq...
متن کاملChaotic Friedmann - Robertson - Walker Cosmology
We show that the dynamics of a spatially closed Friedmann Robertson Walker Universe conformally coupled to a real, free, massive scalar field, is chaotic, for large enough field amplitudes. We do so by proving that this system is integrable under the adiabatic approximation, but that the corresponding KAM tori break up when non adiabatic terms are considered. This finding is confirmed by numeri...
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ژورنال
عنوان ژورنال: Tér és Társadalom
سال: 2017
ISSN: 2062-9923,0237-7683
DOI: 10.17649/tet.31.3.2905