Author:
Chandra Debabrata,Pal Supratik
Abstract
Abstract
In this article, we do a thorough investigation of the competency of the forthcoming
Cosmic Microwave Background (CMB) and Galaxy surveys in probing the features in the primordial
power spectrum. Primordial features are specific model-dependent corrections on top of the
standard power-law inflationary power spectrum; the functional form being given by different
inflationary scenarios. Signature of any significant departure from the feature-less power
spectrum will enable us to decipher the intricacies of the inflationary Universe. Here, we delve
into three major yet distinct features, namely, Bump feature, Sharp feature
signal, and Resonance feature signal. To analyse the features, we adopt a specific
template for each feature model. We estimate the possible constraints on the feature parameters by
employing Fisher matrix forecast analysis for the upcoming CMB missions such as CMB-S4,
CORE-M5, LiteBIRD, PICO conjointly with DESI, and
EUCLID galaxy surveys. To this end, we make use of four distinct observations to forecast
on the bounds on the model parameters, namely, CMB, Baryon Acoustic Oscillations (BAO), Galaxy Clustering and Gravitational Weak Lensing or
Cosmic Shear and their permissible synergy. For large scale structure (LSS) information,
we consider different upper limits of scale for different redshifts for the purpose of
circumventing the propagation of the errors stemming from the uncertainties on nonlinear scales
into the constraints on the feature parameters. A comparative analysis of all three features has
been done to estimate relative capabilities of these upcoming observations in shedding light on
this crucial aspect of precision cosmology.
Subject
Astronomy and Astrophysics
Cited by
7 articles.
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