Binary Collisions of Dark Matter Blobs

Diamond, Melissa D.; Kaplan, David E.; Rajendran, Surjeet

doi:10.48550/arxiv.2112.09147

Cited by 6 publications

(6 citation statements)

References 66 publications

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“…along the lines of [70,98,99]. The solitons, as mentioned in section 3.5, could also merge in the late Universe or when they are bounded into halos, which could change their mass distribution [100].…”

Section: Possible Improvements and Extensionsmentioning

confidence: 98%

Dark photon stars: formation and role as dark matter substructure

Gorghetto

Hardy

March-Russell

et al. 2022

J. Cosmol. Astropart. Phys.

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Any new vector boson with non-zero mass (a 'dark photon' or 'Proca boson') that is present during inflation is automatically produced at this time from vacuum fluctuations and can comprise all or a substantial fraction of the observed dark matter density, as shown by Graham, Mardon, and Rajendran. We demonstrate, utilising both analytic and numerical studies, that such a scenario implies an extremely rich dark matter substructure arising purely from the interplay of gravitational interactions and quantum effects. Due to a remarkable parametric coincidence between the size of the primordial density perturbations and the scale at which quantum pressure is relevant, a substantial fraction of the dark matter inevitably collapses into gravitationally bound solitons, which are fully quantum coherent objects. The central densities of these 'dark photon star', or 'Proca star', solitons are typically a factor 106 larger than the local background dark matter density, and they have characteristic masses of 10-16 M ⊙ (10-5 eV/m)3/2, where m is the mass of the vector. During and post soliton production a comparable fraction of the energy density is initially stored in, and subsequently radiated from, long-lived quasi-normal modes. Furthermore, the solitons are surrounded by characteristic 'fuzzy' dark matter halos in which quantum wave-like properties are also enhanced relative to the usual virialized dark matter expectations. Lower density compact halos, with masses a factor of ∼ 105 greater than the solitons, form at much larger scales. We argue that, at minimum, the solitons are likely to survive to the present day without being tidally disrupted. This rich substructure, which we anticipate also arises from other dark photon dark matter production mechanisms, opens up a wide range of new direct and indirect detection possibilities, as we discuss in a companion paper.

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Section: Possible Improvements and Extensionsmentioning

confidence: 98%

Dark photon stars: formation and role as dark matter substructure

Gorghetto

Hardy

March-Russell

et al. 2022

J. Cosmol. Astropart. Phys.

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“…Exotic compact objects [82] can be considerably lighter than a solar mass and therefore can emit GWs at high frequencies. Examples of such exotic compact objects are boson and fermion stars [82][83][84][85], gravitino stars [86], gravistars [87], and dark matter blobs [88]. In general, the GW waveforms generated by merging exotic compact objects and PBHs are distinct, though this difference is small when the orbital radius is much larger than the spatial size of the merging objects; for simplicity, in our analysis we treat the merging objects as point-like.…”

Section: Sourcesmentioning

confidence: 99%

Detecting High-Frequency Gravitational Waves with Microwave Cavities

Berlin,

Blas,

D'Agnolo

et al. 2021

Preprint

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We give a detailed treatment of electromagnetic signals generated by gravitational waves (GWs) in resonant cavity experiments. Our investigation corrects and builds upon previous studies by carefully accounting for the gauge dependence of relevant quantities. We work in a preferred frame for the laboratory, the proper detector frame, and show how to resum short-wavelength effects to provide analytic results that are exact for GWs of arbitrary wavelength. This formalism allows us to firmly establish that, contrary to previous claims, cavity experiments designed for the detection of axion dark matter only need to reanalyze existing data to search for high-frequency GWs with strains as small as h ∼ 10 −22 − 10 −21 . We also argue that directional detection is possible in principle using readout of multiple cavity modes. Further improvements in sensitivity are expected with cutting-edge advances in superconducting cavity technology.

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“…Their potentially high compactness implies that mergers can generate GWs detectable with present GW observatories. Most present work in the literature on BSs focusses on the GW signatures generated during the pre-merger infall or inspiral [69][70][71][72][73] and during the merger phase itself [21,28,[74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89]; these are, of course, the regimes of most notable interest in the GW observation of neutron-star and black-hole binary coalescences. The main focus of our work, however, is the long-lived post-merger GW emission or afterglow resulting from the merger of two BSs into a single compact but horizon-free remnant; for first explorations of BS coalescences including the relaxation into a non-rotating BS or a hairy BH see [75,79,82].…”

Section: Introductionmentioning

confidence: 99%

The gravitational afterglow of boson stars

Croft

Helfer²,

Ge³

et al. 2023

Class. Quantum Grav.

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In this work we study the long-lived post-merger gravitational wave signature of a boson-star binary coalescence. We use full numerical relativity to simulate the post-merger and track the gravitational afterglow over an extended period of time. We implement recent innovations for the binary initial data, which signiﬁcantly reduce spurious initial excitations of the scalar ﬁeld proﬁles, as well as a measure for the angular momentum that allows us to track the total momentum of the spatial volume, including the curvature contribution. Crucially, we ﬁnd the afterglow to last much longer than the spin-down timescale. This prolonged gravitational wave afterglow provides a characteristic signal that may distinguish it from other astrophysical sources.

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Binary Collisions of Dark Matter Blobs

Cited by 6 publications

References 66 publications

Dark photon stars: formation and role as dark matter substructure

Dark photon stars: formation and role as dark matter substructure

Detecting High-Frequency Gravitational Waves with Microwave Cavities

The gravitational afterglow of boson stars

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