Recrudescence of massive fermion production by oscillons

Saffin, Paul M.

doi:10.1007/jhep07(2017)126

Cited by 5 publications

(3 citation statements)

References 58 publications

(91 reference statements)

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“…As a result, the energy of the Q-ball is reduced, conserving the total energy in this process. The explicit time dependence that appears in the equation for the fluctuations gives the mechanism the character of parametric resonance [92], similar to that seen for particle production in an oscillon background [93].…”

Section: -2mentioning

confidence: 55%

Boson star superradiance

Gao,

Saffin,

Wang

et al. 2024

Sci. China Phys. Mech. Astron.

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Recently, it has been realized that in some systems internal space rotation can induce energy amplification for scattered waves, similar to rotation in real space. In particularly, it has been shown that energy extraction is possible for a Q-ball, a stationary non-topological soliton that is coherently rotating in its field space. In this paper, we generalize the analysis to the case of boson stars, and show that the same energy extraction mechanism still works for boson stars.

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Section: -2mentioning

confidence: 55%

Boson star superradiance

Gao,

Saffin,

Wang

et al. 2024

Sci. China Phys. Mech. Astron.

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“…Of course, it is not limited to the decay of heavy particles. The decay/evaporation of extended objects, such as I-balls/oscillons [23][24][25][26] and primordial black holes [27][28][29][30], also lead to such primary generation of high-energy particles. To have the thermal Universe of O(1) MeV confirmed by the success of BBN, one has to guarantee that the primary high-energy particles are thermalized until then.…”

Section: Jhep10(2022)116 1 Introductionmentioning

confidence: 99%

“…16 1 25. 3.61 3.62 3.59 8.26 8.24 0.816 39.4 5.33 0.867 Asymptotic value of the fraction of distributions at a small momentum R…”

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confidence: 99%

Cascades of high-energy SM particles in the primordial thermal plasma

Mukaida

Yamada

2022

J. High Energ. Phys.

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High-energy standard model (SM) particles in the early Universe are generated by the decay of heavy long-lived particles. The subsequent thermalization occurs through the splitting of high-energy primary particles into lower-energy daughters in primordial thermal plasma. The principal example of such processes is reheating after inflation caused by the decay of inflatons into SM particles. Understanding of the thermalization at reheating is extremely important as it reveals the origin of the hot Universe, and could open up new mechanisms for generating dark matter and/or baryon asymmetry. In this paper, we investigate the thermalization of high-energy SM particles in thermal plasma, taking into account the Landau-Pomeranchuk-Migdal effect in the leading-log approximation. The whole SM particle content and all the relevant SM interactions are included for the first time, i.e., the full gauge interactions of SU(3)c×SU(2)L×U(1)Y and the top Yukawa interaction. The distribution function of each SM species is computed both numerically and analytically. We have analytically obtained the distribution function of each SM species after the first few splittings. Furthermore, we demonstrate that, after a sufficient number of splittings, the particle distributions are asymptotic to certain values at low momentum, independent of the high-energy particles injected by inflaton decay. The results are useful to calculate the DM abundance produced during the pre-thermal phase. An example is provided to illustrate a way to calculate the DM abundance from the scattering between the thermal plasma and high-energy particles in the cascade.

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Quantum corrected Q-ball dynamics

Xie,

Saffin,

Tranberg

et al. 2024

J. High Energ. Phys.

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The physics of individual Q-balls and interactions between multiple Q-balls are well-studied in classical numerical simulations. Interesting properties and phenomena have been discovered, involving stability, forces, collisions and swapping of charge between different components of multi-Q-ball systems. We investigate these phenomena in quantum field theory, including quantum corrections to leading order in a 2PI coupling expansion, the inhomogeneous Hartree approximation. The presence of quantum modes and new decay channels allows the mean-field Q-ball to exchange charge with the quantum modes, and also alters the charge swapping frequencies of the composite Q-balls. It is also observed that the periodic exchanges between the mean-field and quantum modes tend to be quenched by collisions between Q-balls. We illustrate how the classical limit arises through a scaling of the Q-ball potential, making quantum corrections negligible for large-amplitude Q-balls.

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Recrudescence of massive fermion production by oscillons

Cited by 5 publications

References 58 publications

Boson star superradiance

Boson star superradiance

Cascades of high-energy SM particles in the primordial thermal plasma

Quantum corrected Q-ball dynamics

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