Gravitational waves fromQ-ball formation

2009/12/31 by Takeshi Chiba, Kohei Kamada, Masahide Yamaguchi · 21 citations
Physics and Astronomy · #Astrophysics #Ball (mathematics) #Baryon #Baryon asymmetry #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Geometry #Gravitation #Gravitational wave #Logarithm #Mathematical analysis #Omega #Particle physics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Redshift #Universe #astro-ph.CO #gr-qc #hep-ph

paper · pdf · doi:10.1103/physrevd.81.083503

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 81(8) (American Physical Society) · V.2, 46 pages, 12 figures, references added, published version

openalex publication_date 2010/04/01 · arxiv created 2010/11/30 · arxiv updated 2010/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study the detectability of the gravitational waves (GWs) from the Q-ball formation associated with the Affleck-Dine (AD) mechanism, taking into account both the dilution effects due to Q-ball domination and to finite temperature. The AD mechanism predicts the formation of nontopological solitons, Q-balls, from which GWs are generated. Q-balls with large conserved charge Q can produce a large amount of GWs. On the other hand, the decay rate of such Q-balls is so small that they may dominate the energy density of the Universe, which implies that GWs are significantly diluted and that their frequencies are redshifted during the Q-ball dominated era. Thus, the detectability of the GWs associated with the formation of Q-balls is determined by these two competing effects. We find that there is a finite but small parameter region where such GWs may be detected by future detectors such as DECIGO or BBO, only in the case when the thermal logarithmic potential dominates the potential of the AD field. Otherwise GWs from Q-balls would not be detectable even by these futuristic detectors: \ensuremathΩ_GW⁰<10^\ensuremath-21. Unfortunately, for such parameter region the present baryon asymmetry of the Universe can hardly be explained unless one fine-tunes A-terms in the potential. However the detection of such a GW background may give us an information about the early Universe, for example, it may suggest that the flat directions with B\ensuremath-L=0 are favored.

Citations

• Effective search templates for a primordial stochastic gravitational wave background
• Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions
• Gravitational waves from electroweak phase transitions
• Gravitational Waves from Fragmentation of a Primordial Scalar Condensate into Q Balls
• A new mechanism for baryogenesis
• Big-bang nucleosynthesis with long-lived charged slepton
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• Study of late decaying charged particles at future colliders
• Gravitational wave experiments and early universe cosmology
• Probing Inflation with CMB Polarization
• Thermodynamics of non-topological solitons
• Gravitational waves from phase transitions at the electroweak scale and beyond
• On anomalous electroweak baryon-number non-conservation in the early universe
• The Japanese space gravitational wave antenna—DECIGO

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• Challenges and opportunities of gravitational-wave searches at MHz to GHz frequencies