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Results 11 - 20
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11,093
Quantum Cosmological Models
, 2004
"... We contrast the initial condition requirements of various contemporary cosmological models including inflationary and bouncing cosmologies. Quantum cosmology is used, as a first approximation to full quantum gravity, to determine whether suitable initial conditions are present. Various proposals suc ..."
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We contrast the initial condition requirements of various contemporary cosmological models including inflationary and bouncing cosmologies. Quantum cosmology is used, as a first approximation to full quantum gravity, to determine whether suitable initial conditions are present. Various proposals
Cosmological models with variable ”constants”.
, 2008
"... The behavior of the ”constants”, G, c, ¯h, a, e, mi and Λ, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one with radiation ..."
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The behavior of the ”constants”, G, c, ¯h, a, e, mi and Λ, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one
COSMOLOGICAL MODELS AND THE DECELERATION PARAMETER
, 1992
"... In this thesis we utilise a form for the Hubble constant first proposed by Berman (1983) to study a variety of cosmological models. In particular we investigate the Robertson-Walker spacetimes, the Bianchi I spacetime, and the scalar-tensor theory of gravitation of Lau and Prokhovnik (1986). The Ein ..."
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In this thesis we utilise a form for the Hubble constant first proposed by Berman (1983) to study a variety of cosmological models. In particular we investigate the Robertson-Walker spacetimes, the Bianchi I spacetime, and the scalar-tensor theory of gravitation of Lau and Prokhovnik (1986
Exact Inhomogeneous Cosmological Models
, 2008
"... We present new exact inhomogeneous vacuum cosmological solutions of Einstein’s equations. They provide new information about the nature of general cosmological solutions to Einstein’s equations. PACS 04.20.Jb, 98.80H, 04.30.-w Inhomogeneous and anisotropic solutions of Einstein’s equations are of gr ..."
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are of great interest because of the subtleties of their non-linearity and the clues they offer about the generic behaviour of cosmological models near spacetime singularities and at late times. They provide testing grounds for high-energy physics in the early universe and guide the development of quantum
Backreaction in Cosmological Models
, 1999
"... The basic equations for the description of structure formation in cosmology are Einstein’s laws for gravitationally interacting systems or, with restrictions, Newton’s law of gravity. Taking the Universe to be filled with a self–gravitating pressure–less fluid (‘dust’), one has to deal with a nonlin ..."
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nonlinear system of differential equations. To simplify this system of differential equations one commonly assumes special symmetries. Then, for each set of symmetries, we obtain a class of solutions. For simplicity and for some philosophical reasons, most cosmological models studied today are those based
COSMOLOGICAL MODELS OF MODIFIED GRAVITY
, 2013
"... The recent discovery of dark energy has prompted an investigation of ways in which the accelerated expansion of the universe can be realized. In this dissertation, we present two separate projects related to dark energy. The first project analyzes a class of braneworld models in which multiple brane ..."
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The recent discovery of dark energy has prompted an investigation of ways in which the accelerated expansion of the universe can be realized. In this dissertation, we present two separate projects related to dark energy. The first project analyzes a class of braneworld models in which multiple
COSMOLOGICAL MODELS: THEORY AND OBSERVATIONS
, 2000
"... The current status of the theoretical and observational cosmology is reviewed. ..."
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The current status of the theoretical and observational cosmology is reviewed.
Five Dimensional String Cosmological Model
"... Abstract:- In this paper, it is observed that five dimensional Kaluza-Klein space-time in the presence of cosmic string in the frame work of Seaz and Ballester scalar tensor theory of gravitation, the string cosmological models corresponding to geometric string, Takabayasi string and Reddy string ar ..."
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Abstract:- In this paper, it is observed that five dimensional Kaluza-Klein space-time in the presence of cosmic string in the frame work of Seaz and Ballester scalar tensor theory of gravitation, the string cosmological models corresponding to geometric string, Takabayasi string and Reddy string
THE STANDARD COSMOLOGICAL MODEL
, 1998
"... We have a well-established standard model for cosmology and prospects for considerable additions from work in progress. I offer a list of elements of the standard model, comments on controversies in the interpretation of the evidence in support of this model, and assessments of the directions extens ..."
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Cited by 2 (0 self)
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We have a well-established standard model for cosmology and prospects for considerable additions from work in progress. I offer a list of elements of the standard model, comments on controversies in the interpretation of the evidence in support of this model, and assessments of the directions
PERTURBATIONS IN BOUNCING COSMOLOGICAL MODELS
, 2008
"... I describe the features and general properties of bouncing models and the evolution of cosmological perturbations on such backgrounds. I will outline possible observational consequences of the existence of a bounce in the primordial Universe and I will make a comparison of these models with standard ..."
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I describe the features and general properties of bouncing models and the evolution of cosmological perturbations on such backgrounds. I will outline possible observational consequences of the existence of a bounce in the primordial Universe and I will make a comparison of these models
Results 11 - 20
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11,093
