Prompted by the recent MAXIMA-1 and BOOMERANG-98 measurements of the cosmic microwave background (CMB) anisotropy power spectrum and motivated by the results from the observation of high-redshift Type Ia supernovae, we investigate CMB anisotropies in quintessence models in order to characterize the nature of the dark energy today. We perform a Bayesian likelihood analysis, using the MAXIMA-1 and BOOMERANG-98 published band powers, in combination with the COBE/Differential Microwave Radiometer, to explore the space of quintessence parameters: the quintessence energy density Ωphgr and equation of state wphgr. We restrict our analysis to flat, scale-invariant, inflationary adiabatic models. We find that this simple class of inflationary models, with a quintessence component Ωphgr lesssim 0.7, -1 ≤ wphgr lesssim -0.5, is in good agreement with the data. Within the assumptions of our analysis, pure quintessence models seem to be slightly favored, although the simple cosmological constant scenario is consistent with the data.
Implications for Quintessence Models from MAXIMA-1 and BOOMERANG-98 / Balbi, A.; Baccigalupi, C.; Matarrese, S.; Perrotta, F.; Vittorio, N.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 547:2(2001), pp. L89-L92. [10.1086/318904]
Implications for Quintessence Models from MAXIMA-1 and BOOMERANG-98
Baccigalupi, C.;Perrotta, F.;
2001-01-01
Abstract
Prompted by the recent MAXIMA-1 and BOOMERANG-98 measurements of the cosmic microwave background (CMB) anisotropy power spectrum and motivated by the results from the observation of high-redshift Type Ia supernovae, we investigate CMB anisotropies in quintessence models in order to characterize the nature of the dark energy today. We perform a Bayesian likelihood analysis, using the MAXIMA-1 and BOOMERANG-98 published band powers, in combination with the COBE/Differential Microwave Radiometer, to explore the space of quintessence parameters: the quintessence energy density Ωphgr and equation of state wphgr. We restrict our analysis to flat, scale-invariant, inflationary adiabatic models. We find that this simple class of inflationary models, with a quintessence component Ωphgr lesssim 0.7, -1 ≤ wphgr lesssim -0.5, is in good agreement with the data. Within the assumptions of our analysis, pure quintessence models seem to be slightly favored, although the simple cosmological constant scenario is consistent with the data.File | Dimensione | Formato | |
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