The Fate of Dense Scalar Stars

Muia, Francesco; Cicoli, Michele; Clough, Katy; Pedro, Francisco; Quevedo, Fernando; Vacca, Gian Paolo

doi:10.48550/arxiv.1906.09346

Cited by 6 publications

(6 citation statements)

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“…218,219 In string motivated scenario, an oscillon that would disperse in the absence of gravity would either turn into a metastable configuration or collapse to a BH when gravity is included; a metastable oscillon in the absence of gravity would be brought to collapse when gravity is included, depending on the mass and self-interaction model considered. 220 Using the open source numerical code GRCHOMBO, 221 a similar analysis covering a larger class of potentials leads to the mapping of the region of parameter space in which the star would be brought to collapse, disperse, or would remain metastable whether gravity is included or not. 222 The stability of axion stars has received particular attention in the literature.…”

Section: Real Scalar Fieldsmentioning

confidence: 99%

Boson Stars and Oscillatons: A Review

Visinelli

2021

Preprint

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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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Section: Real Scalar Fieldsmentioning

confidence: 99%

Boson Stars and Oscillatons: A Review

Visinelli

2021

Preprint

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“…In this case oscillons are equivalent to oscillatons, see Sec. 3.2.3, and can give rise to interesting additional effects, such as the collapse to BHs [173][174][175][176].…”

Section: Preheatingmentioning

confidence: 99%

Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies

Aggarwal,

Aguiar,

Bauswein

et al. 2020

Preprint

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The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines the challenges and gains expected in gravitational wave searches at frequencies above the LIGO/Virgo band, with a particular focus on the MHz and GHz range. The absence of known astrophysical sources in this frequency range provides a unique opportunity to discover physics beyond the Standard Model operating both in the early and late Universe, and we highlight some of the most promising gravitational sources. We review several detector concepts which have been proposed to take up this challenge, and compare their expected sensitivity with the signal strength predicted in various models. This report is the summary of the workshop Challenges and opportunities of high-frequency gravitational wave detection held at ICTP Trieste, Italy in October 2019.

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“…models [24][25][26]. Other non-standard scenarios invoke, for instance, preheating effects [27][28][29][30][31][32], early matter-domination [33][34][35][36][37] and collapse of cosmic strings [38][39][40][41][42][43]. As modes are stretched on super-horizon scales during inflation, curvature perturbations freeze-out until they re-enter the horizon during the post-inflationary epoch.…”

Section: Introductionmentioning

confidence: 99%

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Franciolini¹,

Maharana²,

Muia³

2022

Preprint

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Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe. This paper critically assesses whether planned and future gravitational wave detectors in the ultra-high-frequency band could constrain the fraction of dark matter composed of sub-solar primordial black holes. Adopting the state-of-the-art description of primordial black hole merger rates, we compare various signals with currently operating and planned detectors. As already noted in the literature, our findings confirm that detecting individual primordial black hole mergers with currently existing and operating proposals remains difficult. Current proposals involving gravitational wave to electromagnetic wave conversion in a static magnetic field and microwave cavities feature a technology gap with respect to the loudest gravitational wave signals from primordial black holes of various orders of magnitude. However, we point out that one recent proposal involving resonant LC circuits represents the best option in terms of individual merger detection prospects in the range (1 ÷ 100) MHz. In the same frequency range, we note that alternative setups involving resonant cavities, whose concept is currently under development, might represent a promising technology to detect individual merger events. We also show that a detection of the stochastic gravitational wave background produced by unresolved binaries is possible only if the theoretical sensitivity of the proposed Gaussian beam detector is achieved. Such a detector, whose feasibility is subject to various caveats, may be able to rule-out some scenarios for asteroidal mass primordial black hole dark matter. We conclude that pursuing dedicated studies and developments of gravitational wave detectors in the ultra-high-frequency band remains motivated and may lead to novel probes on the existence of light primordial black holes.

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The Fate of Dense Scalar Stars

Cited by 6 publications

References 0 publications

Boson Stars and Oscillatons: A Review

Boson Stars and Oscillatons: A Review

Challenges and Opportunities of Gravitational Wave Searches at MHz to GHz Frequencies

Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

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