Enhancement of second-order gravitational waves at Q-ball decay

Abstract

The recent observation of ${}^4$He favors a large lepton asymmetry at the big bang nucleosynthesis. If Q-balls with a lepton charge decay after the electroweak phase transition, such a large lepton asymmetry can be generated without producing too large baryon asymmetry. In this scenario, Q-balls dominate the universe before the decay and induces the sharp transition from the early matter-dominated era to the radiation-dominated era. In this transition, the gravitational waves (GWs) are enhanced through a second-order effect of the scalar perturbations. We evaluate the density of the produced GWs and show that pulsar timing array observations can probe this scenario depending on the amplitude of the scalar perturbations.

arXiv comment16 pages, 4 figures

References in corpus (28)

• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• Baryogenesis from Flat Directions of the Supersymmetric Standard Model
• The cosmological gravitational wave background from primordial density perturbations
• Supersymmetric Q-balls as dark matter
• Semianalytic Calculation of Gravitational Wave Spectrum Nonlinearly Induced from Primordial Curvature Perturbations
• One percent determination of the primordial deuterium abundance
• European Pulsar Timing Array Limits On An Isotropic Stochastic Gravitational-Wave Background
• Gravitational waves from binary supermassive black holes missing in pulsar observations
• Q-Balls and Baryogenesis in the MSSM
• Gravitational wave background as a probe of the primordial black hole abundance
• The effects of He I 10830 on helium abundance determinations
• Solitons in the supersymmetric extensions of the Standard Model
• Q-ball Formation through Affleck-Dine Mechanism
• A new determination of the primordial He abundance using the HeI 10830A emission line: cosmological implications
• Inflationary primordial black holes for the LIGO gravitational wave events and pulsar timing array experiments
• Gravitational waves induced by scalar perturbations as probes of the small-scale primordial spectrum
• Gravitational Wave Production right after a Primordial Black Hole Evaporation
• Induced gravitational wave background and primordial black holes
• Enhancement of Gravitational Waves Induced by Scalar Perturbations due to a Sudden Transition from an Early Matter Era to the Radiation Era
• Q-ball formation: Obstacle to Affleck-Dine baryogenesis in the gauge-mediated SUSY breaking ?
• Gravitational Waves Induced by Scalar Perturbations during a Gradual Transition from an Early Matter Era to the Radiation Era
• EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
• The PHLEK Survey: A New Determination of the Primordial Helium Abundance
• New type of stable Q balls in the gauge-mediated supersymmetry breaking
• Large lepton asymmetry from Q-balls
• Detectable Gravitational Wave Signals from Affleck-Dine Baryogenesis
• Lepton Asymmetric Universe
• The fate of the B ball

Cited by in corpus (9)

• Enhancement of gravitational waves at Q-ball decay including non-linear density perturbations
• Unraveling the early universe's equation of state and primordial black hole production with PTA, BBN, and CMB observations
• Axion Poltergeist
• Using Gravitational Wave Signals to Disentangle Early Matter Dominated Epochs
• Big-Bang Nucleosynthesis on a bubble universe nucleated in Kerr-AdS${}_5$ Black Hole
• Gravitational Wave Mountains: current-carrying domain walls
• Charge distribution of the gauge-mediation type Q ball
• $\delta n$ formalism: A new formulation for the probability density of the curvature perturbation
• Bispectrum of induced gravitational waves in the poltergeist mechanism