English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Subhalos at subgalactic scales ($M\lesssim 10^7 M_\odot$ or $k\gtrsim 10^3\,{\rm Mpc}^{-1}$) are pristine test beds of dark matter (DM). However, theyare too small, diffuse and dark to be visible, in any existing observations. Inthis paper, we develop a complete formalism for weak and strong diffractivelensing, which can be used to probe such subhalos with chirping gravitationalwaves (GWs). Also, we show that Navarro-Frenk-White(NFW) subhalos in this massrange can indeed be detected individually, albeit at a rate of ${\cal O}(10)$or less per year at BBO and others limited by small merger rates and largerequired SNR $\gtrsim 1/\gamma(r_0) \sim 10^3$. It becomes possible as NFWscale radii $r_0$ are of the right size comparable to the GW Fresnel length$r_F$, and unlike all existing probes, their lensing is more sensitive tolighter subhalos. Remarkably, our formalism further reveals that the frequencydependence of weak lensing (which is actually the detectable effect) is due toshear $\gamma$ at $r_F$. Not only is it consistent with an approximate scalinginvariance, but it also offers a new way to measure the mass profile at asuccessively smaller scale of chirping $r_F \propto f^{-1/2}$. Meanwhile,strong diffraction that produces a blurred Einstein ring has a universalfrequency dependence, allowing only detections. These are further demonstratedthrough semianalytic discussions of power-law profiles. Our developments for asingle lens can be generalized and will promote diffractive lensing to a moreconcrete and promising physics in probing DM and small-scale structures.

Small-scale shear: Peeling off diffuse subhalos with gravitational waves