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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Gravitational-wave astronomy has the potential to explore one of the deepestand most puzzling aspects of Einstein's theory: the existence of black holes. Aplethora of ultracompact, horizonless objects have been proposed to arise inmodels inspired by quantum gravity. These objects may solve Hawking'sinformation-loss paradox and the singularity problem associated with blackholes, while mimicking almost all of their classical properties. They are,however, generically unstable on relatively short timescales. Here, we showthat this "ergoregion instability" leads to a strong stochastic background ofgravitational waves, at a level detectable by current and futuregravitational-wave detectors. The absence of such background in the firstobservation run of Advanced LIGO already imposes the most stringent limits todate on black-hole alternatives, showing that certain models of"quantum-dressed" stellar black holes can be at most a small percentage of thetotal population. The future LISA mission will allow for similar constraints onsupermassive black-hole mimickers.

The stochastic gravitational-wave background in the absence of horizons