The Milky Way, coming into focus: Precision astrometry probes its evolution and its dark matter

Gardner, Susan; McDermott, Samuel D.; Yanny, B.

doi:10.1016/j.ppnp.2021.103904

Cited by 15 publications

(19 citation statements)

References 393 publications

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“…These mini-halos are too small to be resolved in a numerical simulation of a MW-mass galaxy, and their rate of survival to the present from tidal stripping due to stars, planets and other compact objects is unsettled [301][302][303][304]. It is expected that a residual number of compact minihalos and boson stars, as well as ultra-cold flows of tidally stripped matter, will be present in our local Galactic region, where we note [305] for a review of the broader possibilities. The former will be seen as transient objects in terrestrial searches.…”

Section: Cosmological and Astrophysical Probesmentioning

confidence: 85%

New Horizons: Scalar and Vector Ultralight Dark Matter

Antypas¹,

Banerjee²,

Bartram³

et al. 2022

Preprint

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The last decade has seen unprecedented effort in dark matter model building at all mass scales coupled with the design of numerous new detection strategies. Transformative advances in quantum technologies have led to a plethora of new high-precision quantum sensors and dark matter detection strategies for ultralight (< 10 eV) bosonic dark matter that can be described by an oscillating classical, largely coherent field. This white paper focuses on searches for wavelike scalar and vector dark matter candidates.

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Section: Cosmological and Astrophysical Probesmentioning

confidence: 85%

New Horizons: Scalar and Vector Ultralight Dark Matter

Antypas¹,

Banerjee²,

Bartram³

et al. 2022

Preprint

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“…Such probes have been explored using pulsar timing arrays (e.g., Refs. [159][160][161][162][163][164][165][166][167][168][169][170][171][172][173]) and some measurements of dark matter and dark-matter substructure have also been performed using astrometry data from the Gaia satellite (e.g., Refs. [171,[174][175][176][177]).…”

Section: Discussionmentioning

confidence: 99%

Astrometric Gravitational-Wave Detection via Stellar Interferometry

Fedderke,

Graham,

Macintosh

et al. 2022

Preprint

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We evaluate the potential for gravitational-wave (GW) detection in the frequency band from 10 nHz to 1 µHz using extremely high-precision astrometry of a small number of stars. In particular, we argue that non-magnetic, photometrically stable hot white dwarfs (WD) located at ∼ kpc distances may be optimal targets for this approach. Previous studies of astrometric GW detection have focused on the potential for less precise surveys of large numbers of stars; our work provides an alternative optimization approach to this problem. Interesting GW sources in this band are expected at characteristic strains around hc ∼ 10 −17 × (µHz/fgw). The astrometric angular precision required to see these sources is ∆θ ∼ hc after integrating for a time T ∼ 1/fgw. We show that jitter in the photometric center of WD of this type due to starspots is bounded to be small enough to permit this high-precision, small-N approach. We discuss possible noise arising from stellar reflex motion induced by orbiting objects and show how it can be mitigated. The only plausible technology able to achieve the requisite astrometric precision is a space-based stellar interferometer. Such a future mission with few-meter-scale collecting dishes and baselines of O(100 km) is sufficient to achieve the target precision. This collector size is broadly in line with the collectors proposed for some formation-flown, space-based astrometer or optical synthetic-aperature imaging-array concepts proposed for other science reasons. The proposed baseline is however somewhat larger than the km-scale baselines discussed for those concepts, but we see no fundamental technical obstacle to utilizing such baselines. A mission of this type thus also holds the promise of being one of the few ways to access interesting GW sources in this band. CONTENTS

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“…We note an interesting, complementary capability of the global GW observation program. If the new vector is ultra-light, then it may constitute some or all of the dark matter [460][461][462][463], though its mass is required to be no smaller than O(10 −22 − 10 −21 ) eV [464][465][466][467] (see also Ref. [468] and references therein).…”

Section: Effects In Neutron Stars-(ultra-)light Xmentioning

confidence: 99%

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

2022

Self Cite

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The neutron lifetime anomaly has been used to motivate the introduction of new physics with hidden-sector particles coupled to baryon number, and on which neutron stars provide powerful constraints. Although the neutron lifetime anomaly may eventually prove to be of mundane origin, we use it as motivation for a broader review of the ways that baryon number violation, be it real or apparent, and dark sectors can intertwine and how neutron star observables, both present and future, can constrain them.

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The Milky Way, coming into focus: Precision astrometry probes its evolution and its dark matter

Cited by 15 publications

References 393 publications

New Horizons: Scalar and Vector Ultralight Dark Matter

New Horizons: Scalar and Vector Ultralight Dark Matter

Astrometric Gravitational-Wave Detection via Stellar Interferometry

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

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