Scalar Field Dark Energy Perturbations and their Scale Dependence TeX Export

@article{citeulike:3140510, abstract = {We estimate the amplitude of perturbation in dark energy at different length scales for a quintessence model with an exponential potential. It is shown that on length scales much smaller than hubble radius, perturbation in dark energy is negligible in comparison to that in in dark matter. However, on scales comparable to the hubble radius (\$\lambda\_{p}\>1000\mathrm{Mpc}\$) the perturbation in dark energy in general cannot be neglected. As compared to the \$\Lambda\$CDM model, large scale matter power spectrum is suppressed in a generic quintessence dark energy model. We show that on scales \$\lambda\_{p} \< 1000\mathrm{Mpc}\$, this suppression is primarily due to different background evolution compared to \$\Lambda\$CDM model. However, on much larger scales perturbation in dark energy can effect matter power spectrum significantly. Hence this analysis can act as a discriminator between \$\Lambda\$CDM model and other generic dark energy models with \$w\_{de} \neq -1\$.}, archivePrefix = {arXiv}, author = {Unnikrishnan, Sanil and Jassal, H. K. and Seshadri, T. R.}, citeulike-article-id = {3140510}, citeulike-linkout-0 = {http://arxiv.org/abs/0801.2017}, citeulike-linkout-1 = {http://arxiv.org/pdf/0801.2017}, day = {6}, eprint = {0801.2017}, keywords = {dark, perturbations}, month = {Nov}, posted-at = {2008-08-20 15:04:56}, priority = {5}, title = {Scalar Field Dark Energy Perturbations and their Scale Dependence}, url = {http://arxiv.org/abs/0801.2017}, year = {2008} }

TY - JOUR ID - citeulike:3140510 L3 - citeulike-article-id:3140510 N2 - We estimate the amplitude of perturbation in dark energy at different length scales for a quintessence model with an exponential potential. It is shown that on length scales much smaller than hubble radius, perturbation in dark energy is negligible in comparison to that in in dark matter. However, on scales comparable to the hubble radius ($\lambda_{p}>1000\mathrm{Mpc}$) the perturbation in dark energy in general cannot be neglected. As compared to the $\Lambda$CDM model, large scale matter power spectrum is suppressed in a generic quintessence dark energy model. We show that on scales $\lambda_{p} < 1000\mathrm{Mpc}$, this suppression is primarily due to different background evolution compared to $\Lambda$CDM model. However, on much larger scales perturbation in dark energy can effect matter power spectrum significantly. Hence this analysis can act as a discriminator between $\Lambda$CDM model and other generic dark energy models with $w_{de} \neq -1$. TI - Scalar Field Dark Energy Perturbations and their Scale Dependence KW - dark KW - perturbations AU - Unnikrishnan, Sanil AU - Jassal, HK AU - Seshadri, TR PY - 2008/Nov/06/ UR - http://arxiv.org/abs/0801.2017 ER -