Cosmic Microwave Background Temperature and Polarization Anisotropy in Brans-Dicke Cosmology
| dc.creator | Chen, Xuelei | |
| dc.creator | Kamionkowski, Marc | |
| dc.date | 1999-05-27 | |
| dc.date.accessioned | 2026-07-07T10:31:51Z | |
| dc.date.available | 2026-07-07T10:31:51Z | |
| dc.description | We develop a formalism for calculating cosmic microwave background (CMB) temperature and polarization anisotropies in cosmological models with Brans-Dicke gravity. We then modify publicly available Boltzmann codes to calculate numerically the temperature and polarization power spectra. Results are illustrated with a few representative models. Comparing with the general-relativistic model with the same cosmological parameters, both the amplitude and the width of the acoustic peaks are different in the Brans-Dicke models. We use a covariance-matrix calculation to investigate whether the effects of Brans-Dicke gravity are degenerate with those of variation in other cosmological parameters and to simultaneously determine whether forthcoming CMB maps might be able to distinguish Brans-Dicke and general-relativistic cosmology. Although the predicted power spectra for plausible Brans-Dicke models differ from those in general relativity only slightly, we find that MAP and/or the Planck Surveyor may in principle provide a test of Brans-Dicke theory that is competitive to solar-system tests. For example, if all other parameters except for the CMB normalization are fixed, a value of the Brans-Dicke parameter omega as large as 500 could be identified with MAP, and for Planck, values as large as omega \simeq3000 could be identified; these sensitivities are decreased roughly by a factor of 3 if we marginalize over the baryon density, Hubble constant, spectral index, and reionization optical depth. In more general scalar-tensor theories, omega may evolve with time, and in this case, the CMB probe would be complementary to that from solar-system tests. | |
| dc.description | 27 pages, 10 figures, typeset using RevTeX | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9905368 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9905368 | |
| dc.identifier | Phys.Rev.D60:104036,1999 | |
| dc.identifier | doi:10.1103/PhysRevD.60.104036 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178557 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Cosmic Microwave Background Temperature and Polarization Anisotropy in Brans-Dicke Cosmology | |
| dc.type | text |