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Evading Lyth bound in models of quintessential inflation
Quintessential inflation refers to an attempt to unify inflation and
late-time cosmic acceleration using a single scalar field. In this letter we
consider two different classes of quintessential inflation, one of which is
based upon a Lagrangian with non-canonical kinetic term and a steep exponential potential while the second
class uses the concept of steep brane world inflation. We show that in both
cases the Lyth bound can be evaded, despite the large tensor-to-scalar ratio of
perturbations. The post-inflationary dynamics is consistent with
nucleosynthesis constraint in these cases.Comment: 6 Latex pages, no figures, reference updated and typos corrected, To
appear in PL
Ölüm
Taha Toros Arşivi, Dosya No: 26-Yaşar Nabi Nayır.
Not: Metin ekli dokümanın 17. sayfasında yer almaktadır
İki Halide Edib
Taha Toros Arşivi, Dosya No: 41-Halide Edip-A. Adnan Adıva
Real-time edge-enhanced optical correlator
The performance of five symbol lock detectors are compared. They are the square-law detector with overlapping (SQOD) and non-overlapping (SQNOD) integrators, the absolute value detectors with overlapping and non-overlapping (AVNOD) integrators and the signal power estimator detector (SPED). The analysis considers various scenarios when the observation interval is much larger or equal to the symbol synchronizer loop bandwidth, which has not been considered in previous analyses. Also, the case of threshold setting in the absence of signal is considered. It is shown that the SQOD outperforms all others when the threshold is set in the presence of signal, independent of the relationship between loop bandwidth and observation period. On the other hand, the SPED outperforms all others when the threshold is set in the presence of noise only
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