Seeding of Primordial Perturbations During a Decelerated Expansion
Yun-Song Piao
TL;DR
This paper investigates how a scalar field with a modified dispersion relation could generate primordial perturbations during a decelerated expansion, potentially explaining structure formation in the universe.
Contribution
It explores the conditions under which scalar fields with modified dispersion relations can seed primordial perturbations in a decelerating universe, addressing key challenges.
Findings
Scalar field perturbations can be generated during decelerated expansion.
Modified dispersion relations influence the spectrum of primordial perturbations.
Potential solutions to difficulties in structure formation scenarios are discussed.
Abstract
A scalar field with a modified dispersion relation may seed, under certain conditions, the primordial perturbations during a decelerated expansion. In this note we examine whether and how these perturbations can be responsible for the structure formation of observable universe. We discuss relevant difficulties and possible solutions.
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