Oscillons of axion-like particle: mass distribution and power spectrum

Kawasaki, Masahiro; Nakano, Wakutaka; Nakatsuka, Hiromasa; Sonomoto, Eisuke

doi:10.1088/1475-7516/2021/01/061

Cited by 16 publications

(39 citation statements)

References 46 publications

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“…They are approximate, time-dependent solitons of the relativistic theory. Such solitons are relevant in many cosmological contexts, both in the early and contemporary universe (for example, see [15,37,55,[63][64][65][66][67][68][69][70][71][72][73][74]). They owe their localization to gravitational interactions [59,[75][76][77], or self-interactions [16,52,78] or a combination of both.…”

Section: Jhep09(2021)050mentioning

confidence: 99%

Beyond Schrödinger-Poisson: nonrelativistic effective field theory for scalar dark matter

Salehian

Zhang

Amin

et al. 2021

J. High Energ. Phys.

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Massive scalar fields provide excellent dark matter candidates, whose dynamics are often explored analytically and numerically using nonrelativistic Schrödinger-Poisson (SP) equations in a cosmological context. In this paper, starting from the nonlinear and fully relativistic Klein-Gordon-Einstein (KGE) equations in an expanding universe, we provide a systematic framework for deriving the SP equations, as well as relativistic corrections to them, by integrating out ‘fast modes’ and including nonlinear metric and matter contributions. We provide explicit equations for the leading-order relativistic corrections, which provide insight into deviations from the SP equations as the system approaches the relativistic regime. Upon including the leading-order corrections, our equations are applicable beyond the domain of validity of the SP system, and are simpler to use than the full KGE case in some contexts. As a concrete application, we calculate the mass-radius relationship of solitons in scalar dark matter and accurately capture the deviations of this relationship from the SP system towards the KGE one.

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Section: Jhep09(2021)050mentioning

confidence: 99%

Beyond Schrödinger-Poisson: nonrelativistic effective field theory for scalar dark matter

Salehian

Zhang

Amin

et al. 2021

J. High Energ. Phys.

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show abstract

“…Recently, similar methods have been proposed [21][22][23]. In [21,23], the authors assumed a certain profile with a single oscillation frequency and computed Γ(ω) by linearizing the field equation of the perturbations around such profile and computing the emitted power perturbatively in the small scalar waves. These (semianalytic) results were then improved by the authors in [22] and were benchmarked against a full numerical simulation.…”

Section: Relax and Fast-forwardmentioning

confidence: 99%

“…Understanding the causes of an oscillon's longevity is thus an important task, to which a lot of work has been devoted (see e.g. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]).…”

mentioning

confidence: 99%

Recipes for Oscillon Longevity

Olle,

Pujolas,

Rompineve

2020

Preprint

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Oscillons are localized states of scalar fields sustained by self interactions. They decay by emitting classical radiation, but their lifetimes are surprisingly large. We revisit the reasons behind their longevity, aiming at how the shape of the scalar potential V (φ) determines the lifetime. The corpuscular picture, where the oscillon is identified with a bound state of a large number of field quanta, allows to understand lifetimes of order of 10 3 cycles in generic potentials. At the non-perturbative level, two properties of the scalar potential can substantially boost the lifetime: the flattening of V (φ) and the positivity of V (φ). These properties are realized in the axion monodromy family of potentials. Moreover, this class of models connects continuously with an exceptional potential that admits eternal oscillon solutions. We check these results with a new fast-forward numerical method that allows to evolve in time to stages that cannot be otherwise simulated on a computer. The method exploits the attractor properties of the oscillons and fully accounts for nonlinearities. We find lifetimes up to 10 14 cycles, but larger values are possible. Our work shows that oscillons formed in the early Universe can be stable on cosmological time scales and thus contribute to the abundance of (ultra)light scalar dark matter.

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“…These regions are plotted as dashed lines. Note that the exponential cutoff on the right side of the figure k/a ∼ m is because of the radius of a oscillon [33]. We also plotted the matter power spectrum of ΛCDM model as the black line for comparison.…”

Section: Dark Matter Halo Profilementioning

confidence: 99%

“…2, we analytically derive the matter power spectrum under the situation where the ULAP oscillons are present in the universe following Ref. [33]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

Probing oscillons of ultra-light axion-like particle by 21 cm forest

Kawasaki

Nakano

Nakatsuka

et al. 2021

J. Cosmol. Astropart. Phys.

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Ultra-Light Axion-like Particle (ULAP) is motivated as one of the solutions to the small scale problems in astrophysics. When such a scalar particle oscillates with an O(1) amplitude in a potential shallower than quadratic, it can form a localized dense object, oscillon. Because of its longevity due to the approximate conservation of the adiabatic invariant, it can survive up to the recent universe as redshift z ∼ O(10). The scale affected by these oscillons is determined by the ULAP mass m and detectable by observations of 21cm line. In this paper, we examine the possibility to detect ULAP by 21cm line and find that the oscillon can enhance the signals of 21cm line observations when m 10 −19 eV and the fraction of ULAP to dark matter is much larger than 10 −2 depending on the form of the potential.

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Oscillons of axion-like particle: mass distribution and power spectrum

Cited by 16 publications

References 46 publications

Beyond Schrödinger-Poisson: nonrelativistic effective field theory for scalar dark matter

Beyond Schrödinger-Poisson: nonrelativistic effective field theory for scalar dark matter

Recipes for Oscillon Longevity

Probing oscillons of ultra-light axion-like particle by 21 cm forest

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