Acoustics of the early universe: flat versus open universe models
نویسندگان
چکیده
منابع مشابه
Acoustics of early universe . I . — flat versus open universe models
In the radiation dominated universe the density perturbations measured in the orthonormal gauge form acoustic waves. If the universe is flat these waves run with constant velocity v = 1/ √ 3 regardless of their wavelength, and their behaviour is not essentially different from the behaviour of gravitational waves. In an open universe, sounds are dispersed by curvature. The group velocity of acou...
متن کاملEarly Universe Models from Noncommutative Geometry
We investigate cosmological predictions on the early universe based on the noncommutative geometry models of gravity coupled to matter. Using the renormalization group analysis for the Standard Model with right handed neutrinos and Majorana mass terms, which is the particle physics content of the most recent noncommutative geometry models, we analyze the behavior of the coefficients of the grav...
متن کاملEarly Universe Evolution in Graviton-dilaton Models
We present a class of graviton-dilaton models which leads to a singularity free evolution of the universe. We study the evolution of a homogeneous isotropic universe. We follow an approach which enables us to analyse the evolution and obtain its generic features even in the absence of explicit solutions, which are not possible in general. We describe the generic evolution of the universe and sh...
متن کاملThe Early Universe
An introductory account is given of the modern understanding of the physics of the early Universe. Particular emphasis is placed on the paradigm of cosmological inflation, which postulates a period of accelerated expansion during the Universe’s earliest stages. Inflation provides a possible origin for structure in the Universe, such as microwave background anisotropies, galaxies and galaxy clus...
متن کاملThe Very Early Universe
In these lectures we dwell upon the cosmological cornerstones of the Very Early Universe (VEU) theory: Parametric Amplification Effect (PAE) responsible for the generation of Pri
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Classical and Quantum Gravity
سال: 2001
ISSN: 0264-9381,1361-6382
DOI: 10.1088/0264-9381/18/3/313