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• W2763055261 abstract "The constraints on various evidences forPhysics at the Planck scale are examined in the context ofinflation. This thesis considers that in three parts. In one weexamine resonant particles or superstrings that may have beenpresent during inflation. In another part we examine the effects ofextra dimensions in the brane-world cosmology on inflation. Alsothe effects on dark radiation is checked andexamined. The primordial power spectrum isbelieved to derive from quantum fluctuations generated during theinflationary epoch. The various observed power spectra of thecosmic microwave background (CMB) are then modified by the dynamicsof the cosmic radiation and matter fluids as various scalesre-enter the horizon along with effects due to the transport ofphotons from the epoch of last scattering to the present time.Indeed, the Planck data have provided thehighest resolution yet available in the determination of the CMBpower spectra. Although the temperature TTprimordial power spectrum is well fit with a simple tilted powerlaw, there remain at least two interesting features that maysuggest deviations from the simplest inflationparadigm. One such feature is the well knownsuppression of the l=2 moment of the CMB power spectrum observedboth by Planck and by the Wilkinson MicrowaveAnisotropy Probe (WMAP). There is also afeature of marginal statistical significance in the observed powerspectrum of both Planck andWMAP near multipoles l=2-30. Both of thesedeviations occur in an interesting region in the CMB power spectrumbecause they correspond to angular scales that are not yet incausal contact when the CMB photons were emitted. Hence, theobserved power spectrum is close to the true primordial powerspectrum for these features. Number of mechanismshave been proposed to deal with the suppression of the powerspectrum on large scales and low multipoles. In this thesis, aparticular approach is proposed to explain irregularities in thelow $ell$ of the CMB power spectrum. In a series of papers we haveexplained that deviations at l = 2 and l = 10-30 could be of theresonant creation of Planck-scale fermions that couple to theinflation. This thesis explores the possibility that a specificsequence of super-string excitations may have made itself known viaits coupling to the inflaton field of inflation. If these ideas arecorrect this could be the first evidence of new physics during thePlanck scale. Here, an analysis of the RandalSundrum brane-world cosmology in the context of the latest CMBconstraints from Planck is done. We summarizeconstraints on the most popular classes of models and explore somemore realistic potentials. The constraint on standard inflationaryparameters changes in the brane-world scenario. The constraints onthe so called ‘Dark’ radiation term from the latest light-elementnuclear reaction rates and the latest CMB data is studied. Here Ialso summarize the constraints on the higher…" @default.
• W2763055261 created "2017-10-20" @default.
• W2763055261 creator A5079079701 @default.
• W2763055261 date "2017-03-27" @default.
• W2763055261 modified "2023-10-16" @default.
• W2763055261 title "Constraints on Inflation and the Origin of Space-Time" @default.
• W2763055261 hasPublicationYear "2017" @default.
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