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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Standard General Relativity assumes that, in the absence of classical mattersources, spacetime is empty. This chapter considers and analyses the newbehaviours of the gravitational field that appear when one substitutes thisemptiness by a reactive vacuum, stemming in particular from the idea of vacuumprovided by quantum field theory. We restrict our study to sphericallysymmetric configurations, and take a simple free quantum scalar field as aproxy to more complicated formulations. Our analysis is split into a study ofstatic and of dynamical configurations. Under the assumption of staticity, wefind and describe the different asymptotically flat self-consistent solutionsthat appear when using a vacuum Renormalised Stress-Energy Tensor (RSET) as anadditional source in the Einstein equations. Of particular interest is thediscovery that, as opposed to standard general relativity, the new theorynaturally contains static ultracompact stellar configurations which couldobservationally be mistaken for black holes (BHs). Then, in our study ofdynamical configurations, we investigate the possibility of these same vacuumeffects changing the internal gravitational processes after an initialgravitational collapse in a way which shows a path towards forming theaforementioned ultracompact configurations. This has lead us to analyse severaldynamical situations seldom contemplated in the literature. Of specialrelevance, we find that the inner horizon that all realistic BHs should containcould inflate outwards quickly enough to meet the outer one before anyappreciable Hawking evaporation has taken place.

After collapse: On how a physical vacuum can change the black hole paradigm