Axion boson stars

Guerra, D.; Macedo, Caio F. B.; Pani, Paolo

doi:10.1088/1475-7516/2019/09/061

Cited by 82 publications

(57 citation statements)

References 87 publications

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“…The dense branch satisfies (15) for all masses. Similar results were reported in [83] and very recently additional dense branches have been found in [84]. The radii on these branches and at small f can be even closer to the black hole radius.…”

Section: Axionssupporting

confidence: 89%

A conjecture on the minimal size of bound states

et al. 2020

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We conjecture that, in a renormalizable effective quantum field theory where the heaviest stable particle has mass m , there are no bound states with radius below 1/m (Bound State Conjecture). We are motivated by the (scalar) Weak Gravity Conjecture, which can be read as a statement forbidding certain bound states. As we discuss, versions for uncharged particles and their generalizations have shortcomings.This leads us to the suggestion that one should only constrain rather than exclude bound objects. In the gravitational case, the resulting conjecture takes the sharp form of forbidding the adiabatic construction of black holes smaller than 1/m . But this minimal bound-state radius remains non-trivial as M P → ∞ , leading us to suspect a feature of QFT rather than a quantum gravity constraint. We find support in a number of examples which we analyze at a parametric level.

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Section: Axionssupporting

confidence: 89%

A conjecture on the minimal size of bound states

et al. 2020

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“…In addition, in 2015, Herdeiro and Radu have studied the quartic-BSs solutions [1], which is extended to the Kerr black holes with self-interacting scalar hair. The study of BSs can be extended to the case of charged BSs [31][32][33], nonrotating and rotating axion boson stars [34,35], Proca stars [36][37][38], and in the higher-dimensional spacetime case [39]. The linear stability of boson stars with respect to small oscillations was discussed by Lee and Pang in [40], the study of the stability properties of boson stars extended to the quartic and sextic self-interaction term case [41], dynamical -BSs [42,43], and non-linear dynamics of spinning BSs case [44].…”

Section: Jhep04(2021)042mentioning

confidence: 99%

Self-interacting multistate boson stars

Zeng

Song

et al. 2021

J. High Energ. Phys.

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In this paper, we consider rotating multistate boson stars with quartic self-interactions. In contrast to the nodeless quartic-boson stars in [1], the self-interacting multistate boson stars (SIMBSs) have two types of nodes, including the 1S2S and 1S2P states. We show the mass M of SIMBSs as a function of the synchronized frequency ω, and the nonsynchronized frequency ω2 for three different cases. Moreover, for the case of two coexisting states with self-interacting potential, we study the mass M of SIMBSs versus the angular momentum J for the synchronized frequency ω and the nonsynchronized frequency ω2. Furthermore, for three different cases, we analyze the coexisting phase with both the ground and first excited states for SIMBSs. We also calculate the maximum value of coupling parameter Λ, and find the coupling parameter Λ exists the finite range.

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“…Axion stars are large amplitude, spatially localized and oscillating φ field configurations (also known as scalar solitons, oscillons, axitons etc. [42][43][44][45][46][47][48][49][50][51][52][53][54][55]). Such exploration is the main purpose of this paper.…”

Section: Introductionmentioning

confidence: 99%

Dipole radiation and beyond from axion stars in electromagnetic fields

Amin

Long

Mou

et al. 2021

J. High Energ. Phys.

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We investigate the production of photons from coherently oscillating, spatially localized clumps of axionic fields (oscillons and axion stars) in the presence of external electromagnetic fields. We delineate different qualitative behaviour of the photon luminosity in terms of an effective dimensionless coupling parameter constructed out of the axion-photon coupling, and field amplitude, oscillation frequency and radius of the axion star. For small values of this dimensionless coupling, we provide a general analytic formula for the dipole radiation field and the photon luminosity per solid angle, including a strong dependence on the radius of the configuration. For moderate to large coupling, we report on a non-monotonic behavior of the luminosity with the coupling strength in the presence of external magnetic fields. After an initial rise in luminosity with the coupling strength, we see a suppression (by an order of magnitude or more compared to the dipole radiation approximation) at moderately large coupling. At sufficiently large coupling, we find a transition to a regime of exponential growth of the luminosity due to parametric resonance. We carry out 3+1 dimensional lattice simulations of axion electrodynamics, at small and large coupling, including non-perturbative effects of parametric resonance as well as backreaction effects when necessary. We also discuss medium (plasma) effects that lead to resonant axion to photon conversion, relevance of the coherence of the soliton, and implications of our results in astrophysical and cosmological settings.

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Axion boson stars

Cited by 82 publications

References 87 publications

A conjecture on the minimal size of bound states

A conjecture on the minimal size of bound states

Self-interacting multistate boson stars

Dipole radiation and beyond from axion stars in electromagnetic fields

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