Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory Export

@misc{citeulike:910288, abstract = {We study brane inflation scenarios in a warped throat geometry and show that there exists a consistency condition between the non-Gaussianity of the curvature perturbation and the amplitude and scale-dependence of the primordial gravitational waves. This condition is independent of the warping of the throat and the form of the inflaton potential. We find that such a relation could be tested by a future CMB polarization experiment if the Planck satellite is able to detect both a gravitational wave background and a non-Gaussian statistic. In models where the observable stage of inflation occurs when the brane is in the tip region of the throat, we derive a further consistency condition involving the scalar spectral index, the tensor-scalar ratio and the curvature perturbation bispectrum. We show that when such a relation is combined with the WMAP3 results, it leads to a model-independent bound on the gravitational wave amplitude given by 0.001 \< r \< 0.01. This corresponds to the range of sensitivity of the next generation of CMB polarization experiments.}, archivePrefix = {arXiv}, author = {Lidsey, James E. and Seery, David}, citeulike-article-id = {910288}, citeulike-linkout-0 = {http://arxiv.org/abs/astro-ph/0610398}, citeulike-linkout-1 = {http://arxiv.org/pdf/astro-ph/0610398}, day = {13}, eprint = {astro-ph/0610398}, keywords = {constraints, cosmology, inflation, nongaussianities}, month = {Oct}, posted-at = {2006-10-23 16:28:19}, priority = {2}, title = {Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory}, url = {http://arxiv.org/abs/astro-ph/0610398}, year = {2006} }

TY - ELEC ID - citeulike:910288 L3 - citeulike-article-id:910288 N2 - We study brane inflation scenarios in a warped throat geometry and show that there exists a consistency condition between the non-Gaussianity of the curvature perturbation and the amplitude and scale-dependence of the primordial gravitational waves. This condition is independent of the warping of the throat and the form of the inflaton potential. We find that such a relation could be tested by a future CMB polarization experiment if the Planck satellite is able to detect both a gravitational wave background and a non-Gaussian statistic. In models where the observable stage of inflation occurs when the brane is in the tip region of the throat, we derive a further consistency condition involving the scalar spectral index, the tensor-scalar ratio and the curvature perturbation bispectrum. We show that when such a relation is combined with the WMAP3 results, it leads to a model-independent bound on the gravitational wave amplitude given by 0.001 < r < 0.01. This corresponds to the range of sensitivity of the next generation of CMB polarization experiments. TI - Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory KW - constraints KW - cosmology KW - inflation KW - nongaussianities AU - Lidsey, James AU - Seery, David PY - 2006/Oct/13/ UR - http://arxiv.org/abs/astro-ph/0610398 ER -