Gravitational wave lensing as a probe of halo properties and dark matter

Tambalo, Giovanni; Zumalacárregui, Miguel; Dai, Liang; Cheung, Mark Ho-Yeuk

doi:10.48550/arxiv.2212.11960

Cited by 5 publications

(4 citation statements)

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“…GW's long wavelength is right to produce observable interference fringes from the lensing by primordial black holes [4][5][6][7][8][9] or by cosmic strings of the strong tension [10]. Even more wave-like diffraction is found to be useful in probing galactic (sub)halos of the diffuse NFW mass profile [11][12][13][14] and cosmological matter power spectrum [15,16]. In more general, exquisite sensitivities to the chirp mass, eccentricity, and the last stage of mergers also open up new probes of wave dark matter [17], compact dark objects [18,19], dark matter captures [20], sub-solar mass black holes [21][22][23], and non-standard gravitation theories.…”

Section: Introductionmentioning

confidence: 99%

Solar diffraction of LIGO-band gravitational waves

Jung

Kim

2023

J. Cosmol. Astropart. Phys.

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We show that chirping gravitational waves in the LIGO frequency band f = 1–5000 Hz can be gravitationally diffracted by the Sun, due to the coincidence of its Fresnel length rF ∝ √1 AU/f and the solar radius r ⊙. This solar diffraction is potentially detectable through its frequency-dependent amplification of the wave. The detection rate with Einstein Telescope is estimated to be ∼ 1/1000 per year, with the optical depth ∝ (solar angular area on the sky)/4π. High-frequency regimes of merger and ringdown phases are found to be crucial. In addition to the discovery, we advocate that solar diffraction allows probing the inner solar density profile, as rF sweeps a range of solar radius during the chirping. These physics are captured by a formalism in terms of convergence and shear, which allows much easier estimation and more intuitive understanding. Solar diffraction can be a new opportunity with ongoing and future LIGO-band missions.

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Section: Introductionmentioning

confidence: 99%

Solar diffraction of LIGO-band gravitational waves

Jung

Kim

2023

J. Cosmol. Astropart. Phys.

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“…One possible way to reveal the underlying properties of DM, and eventually its superfluid nature, could be through gravitational lensing observations [78,79]. In particular, it is expected that the gravitational lensing of central black holes is influenced by the surrounding DM, which would modify for example the photon sphere and black hole shadow, thus providing a novel way to probe DM properties.…”

Section: Jcap04(2023)048 5 Conclusionmentioning

confidence: 99%

Superfluid dark matter around black holes

Luca

Khoury

2023

J. Cosmol. Astropart. Phys.

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Superfluid dark matter, consisting of self-interacting light particles that thermalize and condense to form a superfluid in galaxies, provides a novel theory that matches the success of the standard ΛCDM model on cosmological scales while simultaneously offering a rich phenomenology on galactic scales. Within galaxies, the dark matter density profile consists of a nearly homogeneous superfluid core surrounded by an isothermal envelope. In this work we compute the density profile of superfluid dark matter around supermassive black holes at the center of galaxies. We show that, depending on the fluid equation of state, the dark matter profile presents distinct power-law behaviors, which can be used to distinguish it from the standard results for collisionless dark matter.

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“…Strong lens GW events would provide valuable information about the properties of the lensing objects, test the theory of general relativity in a new regime, probe high-redshift cosmology, study dark matter, search for primordial black holes and MACHOs, precisely localize merging black holes, and more (Takahashi 2005;Itoh et al 2009;Baker & Trodden 2016;Collett & Bacon 2017;Liao et al 2017;Fan et al 2017;Lai et al 2018;Dai et al 2018;Mukherjee et al 2019Mukherjee et al , 2020Diego 2019;Oguri & Takahashi 2020;Goyal et al 2020;Hannuksela et al 2020;Finke et al 2021;Iacovelli et al 2022;Chung & Li 2021;Sereno et al 2010;Bolejko et al 2012;Magaña Hernandez 2022;Tambalo et al 2022b;Basak et al 2022b,a) Depending on the lens mass, gravitational lenses can cause different types of lensing. Massive objects such as galaxies and galaxy clusters can produce strong gravitational lensing, resulting in multiple signals with varying time separations and effects on the GW signal (Takahashi & Nakamura 2003;Dai & Venumadhav 2017;Smith et al 2017Smith et al , 2018bHaris et al 2018;Liu et al 2020;Robertson et al 2020;Ryczanowski et al 2020;Dai et al 2020;Wang et al 2021;Ezquiaga et al 2021;Lo & Hernandez 2021;Janquart et al 2021a,b;Vĳaykumar et al 2022;Çalışkan et a...…”

Section: Millilensesmentioning

confidence: 99%

Exploring the hidden Universe: A novel phenomenological approach for recovering arbitrary gravitational-wave millilensing configurations

Liu¹,

Wong²,

Leong³

et al. 2023

Preprint

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Since the first detection of gravitational waves in 2015, gravitational-wave astronomy has emerged as a rapidly advancing field that holds great potential for studying the cosmos, from probing the properties of black holes to testing the limits of our current understanding of gravity. One important aspect of gravitational-wave astronomy is the phenomenon of gravitational lensing, where massive intervening objects can bend and magnify gravitational waves, providing a unique way to probe the distribution of matter in the universe, as well as finding applications to fundamental physics, astrophysics, and cosmology. However, current models for gravitational-wave millilensing -a specific form of lensing where small-scale astrophysical objects can split a gravitational wave signal into multiple copies -are often limited to simple isolated lenses, which is not realistic for complex lensing scenarios. In this paper, we present a novel phenomenological approach to incorporate millilensing in data analysis in a model-independent fashion. Our approach enables the recovery of arbitrary lens configurations without the need for extensive computational lens modeling, making it a more accurate and computationally efficient tool for studying the distribution of matter in the universe using gravitational-wave signals. When gravitational-wave lensing observations become possible, our method could provide a powerful tool for studying complex lens configurations in the future.

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Gravitational wave lensing as a probe of halo properties and dark matter

Cited by 5 publications

References 0 publications

Solar diffraction of LIGO-band gravitational waves

Solar diffraction of LIGO-band gravitational waves

Superfluid dark matter around black holes

Exploring the hidden Universe: A novel phenomenological approach for recovering arbitrary gravitational-wave millilensing configurations

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