Gravitational Waves from Rapid Structure Formation on Microscopic Scales before Matter-Radiation Equality

Flores, Marcos M.; Kusenko, Alexander; Sasaki, Misao

doi:10.1103/physrevlett.131.011003

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…For estimations of the GWs from non-linear structure formation, see [249], and for possible turbulence after evaporation, see [250]. See also [251] for GWs from the structure formation from Yukawa forces in the early Universe.…”

Section: Gw Background Associated With Pbh Peak Frequency ( F Peak [K...mentioning

confidence: 99%

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Domènech,

Sasaki

2024

Class. Quantum Grav.

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It is possible that primordial black holes constitute (or constituted) a significant fraction of the energy budget of our universe. Terrestrial gravitational wave detectors offer the opportunity to test the existence of primordial black holes in two different mass ranges, from $10^2\,{\rm g}-10^{16}\,{\rm g}$ to $10^{-6}\,M_\odot-100 \,M_\odot$. The first mass window is open via induced gravitational waves, and the second one is by gravitational waves from binary mergers. In this review, we outline and explain the different gravitational wave signatures of primordial black holes that may be probed by terrestrial gravitational wave detectors, such as the current LIGO/Virgo/KAGRA and future ones like Einstein Telescope and Cosmic Explorer. We mainly focus on the associated GW background signals and provide rough estimates for their typical frequency and amplitude. We also discuss complementary probes for these primordial black hole mass ranges.

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Section: Gw Background Associated With Pbh Peak Frequency ( F Peak [K...mentioning

confidence: 99%

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Domènech,

Sasaki

2024

Class. Quantum Grav.

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“…In this paper we discuss a new class of scenarios in which magnetic fields with astrophysically relevant correlation lengths are generated. It is based on a recently discovered phenomenon of primordial structure formation in some specific species [5][6][7][8][9][10][11][12]. Such early structure formation can be caused by relatively long-range forces, for example, Yukawa forces [8][9][10][11][12], which exhibit an instability similar to the gravitational instability, only stronger.…”

Section: Introductionmentioning

confidence: 99%

“…It is based on a recently discovered phenomenon of primordial structure formation in some specific species [5][6][7][8][9][10][11][12]. Such early structure formation can be caused by relatively long-range forces, for example, Yukawa forces [8][9][10][11][12], which exhibit an instability similar to the gravitational instability, only stronger. The growth of structure in some species already during the radiation dominated era represents a possible new epoch in the history of the universe, and it can have profound implications for production of primordial black holes [8,10], generation of the matter-antimatter asymmetry [13], the production of dark matter in the form of weakly interacting particles [14], etc.…”

Section: Introductionmentioning

confidence: 99%

“…We introduce a Yukawa interaction between ψ and φ. On length scales smaller than the mass of φ, this Yukawa interaction represents a long-range attractive force which causes the formation of fermionic halos even in a radiation dominated universe [5][6][7][8][9][10][11][12]. The attractive, relatively long-range Yukawa forces create an instability, which is similar to the gravitational instability, only much stronger.…”

Section: Introductionmentioning

confidence: 99%

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Magnetogenesis from early structure formation due to Yukawa forces

Durrer,

Kusenko

2023

J. Cosmol. Astropart. Phys.

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Yukawa interactions can mediate relatively long-range attractive forces between fermions in the early universe. Such a globally attractive interaction creates an instability that can result in the growth of structure in the affected species even during the radiation dominated era. The formation and collapse of fermionic microhalos can create hot fireballs at the sites of the collapsing halos which inject energy into the cosmic plasma. In this paper we study a new phenomena which can take place in such models. We show that the injected energy can be partially converted into primordial magnetic fields and we estimate the correlation scale and the power spectrum of these fields. We show that they may be the seeds of the observed astrophysical magnetic fields.

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Gravitational waves from collapse of pressureless matter in the early universe

Dalianis,

Kouvaris

2024

J. Cosmol. Astropart. Phys.

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If an early matter phase of the Universe existed after inflation with the proper power spectrum, enhanced density perturbations can decouple from the Hubble flow, turn around and collapse. In contrast to what happens in a radiation dominated Universe where pressure nullifies deviations from sphericity in these perturbations, in a matter dominated Universe, the lack of pressure although on the one hand facilitates the gravitational collapse, it allows small deviations from sphericity to grow substantially as the collapse takes place. The subsequent collapse is complicated: initially as non-spherical deviations grow, the collapsing cloud takes the form of a “Zel'dovich pancake”. After that, the more chaotic and nonlinear stage of violent relaxation begins where shells of the cloud cross and the matter is redistributed within a factor of a few of the free fall timescale, reaching a spherical virialized state. During the whole process, strong gravitational waves are emitted due to the anisotropy of the collapse and the small time interval that the effect takes place. The emission of gravitational waves during the stage of the violent relaxation cannot be easily estimated with an analytical model. We perform an N-body simulation to capture the behaviour of matter during this stage in order to estimate the precise spectrum of gravitational waves produced in this scenario.

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Gravitational Waves from Rapid Structure Formation on Microscopic Scales before Matter-Radiation Equality

Cited by 6 publications

References 43 publications

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Magnetogenesis from early structure formation due to Yukawa forces

Gravitational waves from collapse of pressureless matter in the early universe

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