Structure of the oscillon: The dynamics of attractive self-interaction

Cyncynates, David; Giurgica-Tiron, Tudor

doi:10.1103/physrevd.103.116011

Cited by 23 publications

(16 citation statements)

References 69 publications

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“…Note that this assumes the number changing processes are suppressed as should be the case in the nonrelativistic regime. While suppressed, these processes are present in the relativistic theory and lead to a slow decay of the oscillons via relativistic radiation [67][68][69][70][71][72][73]. When we carry out fully relativistic numerical simulations, we indeed find longlived solutions that are classically stable.…”

Section: Oscillon Solutionsmentioning

confidence: 92%

Polarized Vector Oscillons

Zhang,

Jain,

Amin

2021

Preprint

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Oscillons are spatially localized, time-periodic and long-lived configurations that were primarily proposed in scalar field theories with attractive self-interactions. In this letter, we demonstrate that oscillons also exist in the low-energy effective theory of an interacting massive (real) vector field. We provide two types of vector oscillons with vanishing orbital angular momentum, and approximately spherically symmetric energy density, but not field configurations. These are: (1) "directional" oscillons (linearly polarized), with vanishing total intrinsic spin, and (2) "spinning" oscillons (circularly polarized) with a macroscopic instrinsic spin equal to × number of particles in the oscillon. In contrast to the case with only gravitational interactions, the two oscillons have different energy at a fixed particle number even in the nonrelativistic limit. By carrying out relativistic 3 + 1d simulations, we show that these oscillons can be long-lived (compared to the oscillation time for the fields), and can arise from a range of Gaussian initial spatial profiles. These considerations make vector oscillons potentially relevant during the early universe and in dark photon dark matter, with novel phenomenology related to their polarization.

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Section: Oscillon Solutionsmentioning

confidence: 92%

Polarized Vector Oscillons

Zhang,

Jain,

Amin

2021

Preprint

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“…Refs. [87][88][89][90][91][92]), this enhancement would allow them to survive to matter-radiation equality even at larger axion masses m 10 −15 eV for the longest lived oscillons [92]. At late times, if such an oscillon is in a galactic halo of θ L DM and it can remain locked to the virialized ρ L background, then the only upper bound on its lifetime comes FIG.…”

Section: Discussion and Future Directionsmentioning

confidence: 99%

“…This deviation remains small until the perturbations begin collapsing under their own attractive self-interaction, which we mark with a vertical black line. The objects nucleating from this nonlinear collapse are oscillons: long-lived spherically symmetric scalar configurations held together by attractive self-interaction [83][84][85][86][87][88][89][90][91][92]. At this point, both ρ S and ρ L diverge from the prediction of Sec.…”

Section: Nonperturbative Structures During Autoresonancementioning

confidence: 99%

Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics

Cyncynates,

Giurgica-Tiron,

Simon

et al. 2021

Preprint

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A generic low-energy prediction of string theory is the existence of a large collection of axions, commonly known as a string axiverse. Axions also have a natural cosmological production mechanism, vacuum misalignment, making them well-motivated dark matter (DM) candidates. Much work on axion production has considered the case of a single free axion, but in a realistic axiverse, string axions are expected to be distributed densely over many orders of magnitude in mass, and to interact with one another through their joint potential. In this paper, we show that non-linearities in this potential lead to a new type of resonant energy transfer between axions with nearby masses. This resonance generically transfers energy from axions with larger decay constants to those with smaller decay constants, and leads to a multitude of signatures. These include enhanced direct detection prospects for a resonant pair comprising even a small subcomponent of dark matter, and boosted small-scale structure if the pair is the majority of DM. Near-future iterations of experiments such as ADMX and DM Radio will be sensitive to this scenario, as will astrophysical probes of DM substructure.

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“…They appear in the spectacular number of attractive theories in low enough d, see refs. [4][5][6][7][8][9][10][11][12][13][14]72]. Although the model (2.2) is generic from the viewpoint of oscillon longevity, these objects typically survive to the end of our simulations lasting up to 10 5 cycles.…”

Section: Oscillons: Numerical Illustrationmentioning

confidence: 92%

An Effective Field Theory for large oscillons

Levkov

Maslov

Nugaev

et al. 2022

J. High Energ. Phys.

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We consider oscillons — localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. We develop their effective description in the limit of large size at finite field strength. Namely, we note that nonlinear long-range field configurations can be described by an effective complex field ψ(t,x) which is related to the original fields by a canonical transformation. The action for ψ has the form of a systematic gradient expansion. At every order of the expansion, such an effective theory has a global U(1) symmetry and hence a family of stationary nontopological solitons — oscillons. The decay of the latter objects is a nonperturbative process from the viewpoint of the effective theory. Our approach gives an intuitive understanding of oscillons in full nonlinearity and explains their longevity. Importantly, it also provides reliable selection criteria for models with long-lived oscillons. This technique is more precise in the nonrelativistic limit, in the notable cases of nonlinear, extremely long-lived, and large objects, and also in lower spatial dimensions. We test the effective theory by performing explicit numerical simulations of a (d + 1)-dimensional scalar field with a plateau potential.

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Structure of the oscillon: The dynamics of attractive self-interaction

Cited by 23 publications

References 69 publications

Polarized Vector Oscillons

Polarized Vector Oscillons

Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics

An Effective Field Theory for large oscillons

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