Non-equilibrium dynamics of a scalar field with quantum backreaction

Kainulainen, Kimmo; Koskivaara, Olli

doi:10.1007/jhep12(2021)190

Cited by 13 publications

(24 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When v φ (z) = 0, the CP-violating coupling between φ 2 and χ L χ R in eq. (2.5) gives rise to a complex phase in the mass of χ, 2) can be written in a semi-classical approximation as [12,71,72] (see also [73][74][75][76][77][78])…”

Section: Jhep08(2022)010mentioning

confidence: 99%

Filtered baryogenesis

Baker

Breitbach

Mittnacht

et al. 2022

J. High Energ. Phys.

View full text Add to dashboard Cite

We propose a new mechanism to simultaneously explain the observed dark matter abundance and the baryon asymmetry of the Universe. The mechanism is based on the Filtered Dark Matter scenario, where dark matter particles acquire a large mass during a first-order phase transition. This implies that only a small fraction of them are energetic enough to enter the advancing true vacuum bubbles and survive until today, while the rest are reflected and annihilate away quickly. We supplement this scenario with a CP-violating interaction, which creates a chiral asymmetry in the population of dark matter particles. In the false vacuum phase, a portal interaction quickly converts the dark sector chiral asymmetry into a Standard Model lepton asymmetry. The lepton asymmetry is then partially converted to a baryon asymmetry by standard electroweak sphaleron processes. We discuss the dependence of the generated asymmetry on the parameters of the model for two different portal interactions and demonstrate successful baryogenesis for both. For one of the portals, it is also possible to simultaneously explain the observed dark matter abundance, over many orders of magnitude in the dark matter mass.

show abstract

Section: Jhep08(2022)010mentioning

confidence: 99%

Filtered baryogenesis

Baker

Breitbach

Mittnacht

et al. 2022

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Finding a complete solution of such problems often requires non-perturbative methods and non-equilibrium quantum field theory. In particular in the case of resonant particle production the backreaction of the newly created quanta may have significant effects on the evolution of the coupled system [33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

“…In [39], the dynamics of non-minimally coupled scalars were studied using classical lattice simulations. Here we revisit the tachyonic dark matter production of [14] applying a fully non-perturbative 2PI-approach using methods introduced in [38] (for earlier work see [40][41][42][43][44]).…”

Section: Introductionmentioning

confidence: 99%

Tachyonic production of dark relics: a non-perturbative quantum study

Kainulainen

Koskivaara

Nurmi

2023

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We study production of dark relics during reheating after the end of inflation in a system consisting of a non-minimally coupled spectator scalar field and the inflaton. We derive a set of renormalized quantum transport equations for the one-point function and the two-point function of the spectator field and solve them numerically. We find that our system can embody both tachyonic and parametric instabilities. The former is an expected result due to the non-minimal coupling, but the latter displays new features driven by a novel interplay of the two-point function with the Ricci scalar. We find that when the parametric instability driven by the two-point function takes place, it dominates the total particle production. The quantitative results are also found to be highly sensitive to the model parameters.

show abstract

“…4 For an excellent complementary understanding to Ref. [44], see the recent work [45] where the authors study the condensate evolution beyond the small-field regime and solve the coupled equations of motion for the condensate and two-point functions numerically, capturing effects from both parametric resonance and spinodal instability.…”

Section: Introductionmentioning

confidence: 99%

Dissipation of oscillating scalar backgrounds in an FLRW universe

Wang¹,

Ai²

2022

Preprint

View full text Add to dashboard Cite

We study particle production from oscillating scalar backgrounds in a spatially flat Friedmann-Lemaître-Robertson-Walker universe using non-equilibrium quantum field theory which fully captures the thermal effects and backreaction effects. To be concrete, we consider a Z 2 -symmetric two-scalar model with quartic interactions. For quasi-harmonic oscillations, we adopt the multi-scale analysis to obtain analytical approximate expressions for the self-consistent evolution of the scalar background and the energy density of the produced particles in terms of the retarded self-energy and retarded proper four-vertex function, whose imaginary parts characterize different condensate decay channels and lead to dissipation. We find that reheating in this model can be complete if the imaginary part of the retarded self-energy is non-vanishing, which causes dissipation only at finite temperature through Landau damping. Our results can be generalized to more complicated models and thus could provide a general framework for studying the perturbative reheating process in the early Universe or perturbative production of Dark Matter from an oscillating inflaton.

show abstract

Non-equilibrium dynamics of a scalar field with quantum backreaction

Cited by 13 publications

References 40 publications

Filtered baryogenesis

Filtered baryogenesis

Tachyonic production of dark relics: a non-perturbative quantum study

Dissipation of oscillating scalar backgrounds in an FLRW universe

Contact Info

Product

Resources

About