Erratum to Time-dependent cosmological term
نویسندگان
چکیده
منابع مشابه
Coasting Cosmologies with Time Dependent Cosmological Constant
The effect of a time dependent cosmological constant is considered in a family of scalartensor theories. FriedmannRobertsonWalker cosmological models for vacuum and perfect fluid matter are found. They have a linear expansion factor, the so called coasting cosmology, the gravitational ”constant” decreases inversely with time; that is these models satisfy the Dirac Hypotheses. The cosmological ”...
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Spatially homogeneous and anisotropic Bianchi type V space-time with bulk viscous fluid source and time-dependent cosmological term are considered. Cosmological models have been obtained by assuming a variation law for the Hubble parameter which yields a constant value of deceleration parameter. Physical and kinematical parameters of the models are discussed. The models are found to be compatib...
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In the light of the proposal of Ref. [1], we discuss in detail the issue of the cosmological constant, explaining how can string theory naturally predict the value which is experimentally observed, without low-energy supersymmetry. e-mail: [email protected]
متن کاملDarboux Class of Cosmological Fluids with Time Dependent Adiabatic Indices
A one-parameter family of time dependent adiabatic indices is introduced for any given type of cosmological fluid of constant adiabatic index by a mathematical method belonging to the class of Darboux transformations. The procedure works for zero cosmological constant at the price of introducing a new constant parameter related to the time dependence of the adiabatic index. These fluids can be ...
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We study a moving D-brane in a time-dependent background. There is particle production both because of non-trivial cosmological evolution, and by closed string emission from the brane that gradually decelerates due to a gain in mass. The particular model under study is a D0-brane in an SL(2, R)/U(1) cosmology – the techniques used extend to other backgrounds.
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ژورنال
عنوان ژورنال: Il Nuovo Cimento B
سال: 1986
ISSN: 1826-9877
DOI: 10.1007/bf02759759