Dual Inflation and Bounce Cosmologies Interpretation of Pulsar Timing Array Data

TL;DR

This paper proposes a dual inflation and bounce cosmology model that explains gravitational wave signals and CMB data, supported by Bayesian analysis of pulsar timing array observations, suggesting a new duality in early universe theories.

Contribution

It introduces a novel dual inflation-bounce scenario that fits pulsar timing array data and CMB anisotropies, supported by Bayesian evidence, advancing early universe cosmology models.

Findings

Bayesian analysis identifies viable inflation and bounce regions.

Dual scenario explains stochastic gravitational wave background.

Bayes factor favors dual scenario over conventional models.

Abstract

We explore a dual scenario of generalized inflation and bounce cosmologies, producing a scale-invariant curvature perturbation spectrum. Bayesian analysis with pulsar timing array data identifies, for the first time, viable regions from inflation and bounce that simultaneously explain stochastic gravitational wave background (SGWB) signals and CMB anisotropies. Bayes factor calculations strongly favor this dual scenario over conventional sources and provide initial evidence of a duality between inflation and bounce regarding SGWB, offering new insights for early universe model-building and future observations.