Signature of short distance physics on inflation power spectrum and CMB anisotropy
نویسندگان
چکیده
منابع مشابه
Short Distance Physics and Initial State Effects on the CMB Power Spectrum and Cosmological Constant
We investigate a modification in the action of inflaton due to noncommutativity leads to a nonstandard initial vacuum and oscillatory corrections in the initial power spectrum. We show that the presence of these oscillations causes a drop in the WMAP χ2 about ∆χ2 ∼ 8.5. We also show that this nonstandard initial vacuum state can provide a rolling in cosmological constant. As a bonus, from the p...
متن کاملShort Distance Physics and Initial State Effects on the CMB Power Spectrum
We investigate a modification in the action of inflaton due to noncommutativity leads to a nonstandard initial vacuum and oscillatory corrections in the initial power spectrum. We show that the presence of these oscillations causes a drop in the WMAP χ2 about ∆χ2 ∼ 8.5. As a bonus, from the parameter estimation done in this work, we show that the noncommutative parameters can be precisely bound...
متن کاملCmb Anisotropy Power Spectrum Statistics
Much attention has been given to the problem of estimating cosmological parameters from the Cl measured by future experiments. Many of the approaches which are being used either invoke poorly controlled approximations or are computationally expensive. We derive exact results as well as fast and highly accurate approximations for mapping a theoretical model onto the observed power spectrum coeff...
متن کاملOn the APM power spectrum and the CMB anisotropy: Evidence for a phase transition during inflation?
Adams et al. (1997b) have noted that according to our current understanding of the unification of fundamental interactions, there should have been phase transitions associated with spontaneous symmetry breaking during the inflationary era. This may have resulted in the breaking of scale-invariance of the primordial density perturbation for brief periods. A possible such feature was identified i...
متن کاملSlow-roll Inflation and Cmb Anisotropy Data
We emphasize that the estimation of cosmological parameters from CMB anisotropy data, such as the recent high resolution maps from BOOMERanG and MAXIMA-1, requires assumptions on the primordial spectra. The latter are predicted from inflation. The physically best motivated scenario is slow-roll inflation. However, very often the unphysical power-law inflation scenario is (implicitly) assumed in...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2009
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2009/09/009