Oscillons from pure natural inflation

Hong, Jaesung; Kawasaki, Masahiro; Yamazaki, Masahito

doi:10.1103/physrevd.98.043531

Cited by 45 publications

(48 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even in this simple case, the post-inflation epoch can host interesting nonlinear physics. In particular, for M M P , as the field explores the flatter-than-quadratic region of the potential (φ M with α < 2), broad self-resonance drives copious production of oscillons [117,118,119,120,121,122,123]. Oscillons are highly overdense, spatially localized, exceptionally long-lived field configurations [124,125,126,127,128,129,130] where the field amplitude in their cores does not redshift as the universe expands.…”

Section: The Modelmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

View full text Add to dashboard Cite

It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe -taking place either before or after BBN -and the constraints on them, as they have been discussed in the literature during the recent years.

show abstract

Section: The Modelmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

View full text Add to dashboard Cite

show abstract

“…The latter process -when efficient enough -can lead to very fast reheating and the emergence of nonlinear effects, such as oscillon formation [16][17][18][19][20][21][22]. (For reviews of reheating, see Refs.…”

Section: Introductionmentioning

confidence: 99%

Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings

Vis¹,

Nguyen

Sfakianakis

et al. 2020

Phys. Rev. D

View full text Add to dashboard Cite

We have conducted extensive lattice simulations to study the post-inflation dynamics of multifield models involving nonminimal couplings. We explore the parameter dependence of preheating in these models and describe the various timescales that control such nonlinear processes as energy transfer, re-scattering, and the approach to radiation-domination and thermalization. In the limit of large nonminimal couplings (ξ I ∼ 100), we find that efficient transfer of energy from the inflaton condensate to radiative degrees of freedom, emergence of a radiation-dominated equation of state, and the onset of thermalization each consistently occur within N reh 3 e-folds after the end of inflation, largely independent of the values of the other couplings in the models. The exception is the case of negative ellipticity, in which there is a misalignment between the dominant direction in field-space along which the system evolves and the larger of the nonminimal couplings ξ I. In those cases, the field-space-driven parametric resonance is effectively shut off. More generally, the competition between the scalar fields' potential and the field-space manifold structure can yield interesting phenomena such as two-stage resonances. Across many regions of parameter space, we find efficient rescattering between the distinct fields, leading to a partial memory loss of the shape of the initial fluctuation spectrum. Despite the explosive particle production, which can lead to a quick depletion of the background energy density, the nonlinear processes do not induce any super-horizon correlations after the end of inflation in these models, which keeps predictions for CMB observables unaffected by the late-time amplification of isocurvature fluctuations. Hence the excellent agreement between primordial observables and recent observations is preserved for this class of models, even when we consider post-inflation dynamics.

show abstract

“…The I-ball/oscillon is produced in various contexts of the early universe. For example, the oscillations of the inflaton after inflation can lead to a strong inhomogeneity through the self-resonance, which results in the formation of the I-ball/oscillon [21][22][23][24][25][26][27][28][29]. The inflatonic I-ball/oscillon formation produces the gravitational wave, and its spectrum is studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

Decay of I-ball/oscillon in classical field theory

Ibe

Kawasaki

Nakano

et al. 2019

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

I-balls/oscillons are long-lived and spatially localized solutions of real scalar fields. They are produced in various contexts of the early universe in, such as, the inflaton evolution and the axion evolution. However, their decay process has long been unclear. In this paper, we derive an analytic formula of the decay rate of the I-balls/oscillons within the classical field theory. In our approach, we calculate the Poynting vector of the perturbation around the I-ball/oscillon profile by solving a relativistic field equation, with which the decay rate of the I-ball/oscillon is obtained. We also perform a classical lattice simulation and confirm the validity of our analytical formula of the decay rate numerically. *

show abstract

Oscillons from pure natural inflation

Cited by 45 publications

References 29 publications

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings

Decay of I-ball/oscillon in classical field theory

Contact Info

Product

Resources

About