Generalized uncertainty principle and stochastic gravitational wave background spectrum

TL;DR

This study examines how the generalized uncertainty principle (GUP) influences the stochastic gravitational wave background from early universe QCD phase transitions, revealing that GUP shifts the peak frequency and weakens the signal, aiding future detection efforts.

Contribution

It introduces a modified framework incorporating GUP into the analysis of gravitational wave signals from QCD phase transitions, providing new insights into their spectral features and detectability.

Findings

GUP causes an increase in the peak frequency of SGW signals.

GUP weakens the overall SGW signal amplitude.

Results support testing GUP effects through cosmological gravitational wave observations.

Abstract

This paper concerned with the effect of generalized uncertainty principle (GUP) on the stochastic gravitational wave (SGW) background signal that produced during first order cosmological QCD phase transition in early universe. A modified formula of entropy is used to calculate the temporal evolution of temperature of the universe as a function of the Hubble parameter. The pressure that results from the recent lattice calculations, which provides parameterizations of the pressure due to $u,~d,~s$ quarks and gluons, with trace anomaly is used to describe the equation of state around QCD epoch. A redshift in the peak frequency of SGW at current epoch is calculated. The results indicate an increase in the frequency peak due to GUP effect, which improves the ability to detect it. Taking into account bubble wall collisions (BWC) and turbulent magnetohydrodynamics (MHD) as a source of SGW, a fractional energy density is investigated. It is found that the GUP effect weakens the SGW signal generated during QCD phase transition in comparison to its counterpart in the absence of GUP. These results support understanding the cosmological QCD phase transition and test the effectiveness of the GUP theory.