Braneworld tensor anisotropies in the CMB
نویسندگان
چکیده
Cosmic microwave background (CMB) observations provide in principle a high-precision test of models which are motivated by M theory. We set out the framework of a program to compute the tensor anisotropies in the CMB that are generated in braneworld models. In the simplest approximation, we show the braneworld imprint as a correction to the power spectra for standard temperature and polarization anisotropies.
منابع مشابه
ar X iv : g r - qc / 0 31 10 16 v 1 5 N ov 2 00 3 Spin - Torsion , Braneworlds and Changing Symmetry in the Universe From the Beginning to the End
In this thesis, we explore three alternatives to the current paradigm of the standard inflationary big bang scenario. The three alternative themes are spin torsion (or Einstein-Cartan-Kibble-Sciama) theories, extra dimensions (braneworld cosmology) and changing global symmetry. In the spin torsion theories, we found new cosmological solutions with a cosmological constant as alternative to the s...
متن کاملPrincipal Component Analysis of the Cosmic Microwave Background Anisotropies: Revealing The Tensor Degeneracy
A principal component analysis of cosmic microwave background (CMB) anisotropy measurements is used to investigate degeneracies among cosmological parameters. The results show that a degeneracy with tensor modes – the ‘tensor degeneracy’ – dominates uncertainties in estimates of the baryon and cold dark matter densities, ωb = Ωbh , ωc = Ωch , from an analysis of CMB anisotropies alone. The prin...
متن کاملar X iv : a st ro - p h / 96 10 23 4 v 1 2 9 O ct 1 99 6 Anisotropies in the Cosmic Microwave
The analysis of anisotropies in the cosmic microwave background (CMB) has become an extremely valuable tool for cosmology. We even have hopes that planned CMB anisotropy experiments may revolutionize cosmology. Together with determinations of the CMB spectrum, they represent the first cosmological precision measurements. This is illustrated in the talk by Anthony Lasenby. The value of CMB aniso...
متن کاملThe Scalar, Vector and Tensor Contributions to CMB anisotropies from Cosmic Defects
Recent work has emphasised the importance of vector and tensor contributions to the large scale microwave anisotropy fluctuations produced by cosmic defects. In this paper we provide a general discussion of these contributions, and how their magnitude is constrained by the fundamental assumptions of causality, scaling, and statistical isotropy. We discuss an analytic model which illustrates and...
متن کاملA Complete Treatment of Cmb Anisotropies in a Frw Universe
We generalize the total angular momentum method for computing Cosmic Microwave Background anisotropies to Friedman-Robertson-Walker (FRW) spaces with arbitrary geometries. This uni es the treatment of temperature and polarization anisotropies generated by scalar, vector and tensor perturbations of the fluid, seed, or a scalar eld, in a universe with constant comoving curvature. The resulting fo...
متن کامل