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Boson Stars and Oscillatons: A Review
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Compact objects occupy a pivotal role in the exploration of Nature. The interest spans from the role of compact objects in astrophysics to their detection through various methods (gravitational waves interferometry, microlensing, imaging). While the existence of compact objects made of fermions (neutron stars and white dwarfs) has been assessed, a parallel search for localized solitons made of bosons is ongoing, stemming from Wheeler's original proposal of electromagnetic "geons". Boson fields can clump up and form compact objects such as boson stars (for complex scalar fields), oscillons and oscillatons (for real scalar fields), or Proca stars (for massive vector fields), which can show up in searches as black hole mimickers, dark matter sources, and a variety of other phenomena. I review some crucial properties of these bosonic systems, including recent progress in the field.
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Cited by 12 Pith papers
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Dust stars in the minimal exponential measure model
Dust can form stable horizonless compact objects in the MEMe modified gravity model, offering a dark matter candidate and a mechanism that suppresses black hole formation below about 10^-11 solar masses.
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Radial spectra and dynamical signatures of excited boson stars
For excited boson stars, the first zero of the fundamental radial mode matches the first critical point of mass, charge, and binding energy for all tested node numbers and self-interactions.
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High-Frequency Gravitational Wave Detection with Superconducting Qubits
An idealized model shows that Dicke-entangled transmon qubits at the TE212 cavity mode could reach a strain sensitivity of about 5.6e-26 at 5 GHz, scaling as n_q^{-3/4}.
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Periodic Gravitational Lensing with Oscillating Boson Stars
Oscillating boson stars should produce periodic gravitational lensing: phase-locked photometric spikes and astrometric wobbles as a radial caustic pulses.
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Scalar fields from nonlinear sigma models on black hole spacetimes
Numerical evolutions show positive-curvature SL(2,R) sigma-model scalars create denser clouds and earlier binary mergers, while negative-curvature O(3) scalars spread out and delay mergers.
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Nonrelativistic Proca stars: Spherical stationary and multi-frequency states
Nonrelativistic Proca stars have a ground state with constant polarization (linear or circular depending on the sign of the spin-spin coupling), and a symmetry-enhanced sector with λs=0 contains a continuum of multi-f...
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Proca stars in excited states
Excited Proca stars are always unstable: under perturbations they collapse, disperse, or migrate to the ground state, with migration possible only for a narrow set of negative-binding-energy configurations.
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Wide binaries in ultra-faint dwarf galaxies as a probe of extended dark objects
Wide binaries in Boötes I exclude dark-matter fractions down to ~10^-3 to 10^-2 for extended dark objects between 0.1 and 3000 solar masses with radii up to 10^7 solar radii, implying P_R ≲ 5×10^-6 at k ≈ 4×10^2-3×10^...
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On relativistic observables in black bounce spacetimes
Black bounce spacetimes with larger throat parameter α produce enhanced periastron precession, light deflection, and a larger critical impact parameter in the wormhole regime, offering potential observational signatures.
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Hayward Boson Stars
Hayward boson stars exist only when sqrt(beta)/Q > 1.49661, exactly where the vacuum Hayward spacetime has no horizon.
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Non-topological solitons and quasi-solitons
A comprehensive review of non-topological solitons (Q-balls) and quasi-solitons (oscillons), their properties, dynamics, and roles in early-universe physics.
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