What question did this study set out to answer?

This research aims to calculate the gravitational waves produced by the CCEGA cosmological bounce and relate them to current NANOGrav observations.

March 26, 2026Open Access

CCEGAP20: The Echo of the Big Bang in Pulsar Clocks: How the Birth of the Universe Left a Signal in NANOGrav

Key Points

This research aims to calculate the gravitational waves produced by the CCEGA cosmological bounce and relate them to current NANOGrav observations.
Calculated the stochastic gravitational wave background generated by the CCEGA cosmological bounce.
Analyzed the gravitational radiation at Hubble frequency, redshifted to today's frequency of 8.2 nHz.
Compared the calculated amplitude with NANOGrav's 2023 detection and addressed the spectral shape of the signals.
Identified the gravitational wave amplitude at Omega_GW*h^2 ≃ 1.5×10^{-9}, consistent with NANOGrav findings.
Demonstrated that the NANOGrav signal could include a component from the CCEGA bounce.
Predicted that the SKA could confirm or refute these findings within the decade.

Abstract

Calculates the stochastic gravitational wave background (SGWB) generated by the CCEGA cosmological bounce at TQCD = 154 MeV. The bounce produces gravitational radiation at the Hubble frequency, redshifted to fₚeak ≃ 8. 2 nHz today — precisely the NANOGrav/SKA band. The amplitude is OmegaGW*h² ≃ 1. 5×10^-9, comparable to the NANOGrav 2023 detection. Both are fixed by TQCD with no free parameters. The NANOGrav signal may already contain a cosmological component from the CCEGA bounce, distinguishable from the SMBHB background by its peaked spectral shape. The SKA will confirm or exclude this prediction within the current decade.

CCEGAP20: The Echo of the Big Bang in Pulsar Clocks: How the Birth of the Universe Left a Signal in NANOGrav

Key Points

Abstract

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