5 research outputs found
Core collapse in massive scalar-tensor gravity
This paper provides an extended exploration of the inverse-chirp
gravitational-wave signals from stellar collapse in massive scalar-tensor
gravity reported in [Phys. Rev. Lett. {\bf 119}, 201103]. We systematically
explore the parameter space that characterizes the progenitor stars, the
equation of state and the scalar-tensor theory of the core collapse events. We
identify a remarkably simple and straightforward classification scheme of the
resulting collapse events. For any given set of parameters, the collapse leads
to one of three end states, a weakly scalarized neutron star, a strongly
scalarized neutron star or a black hole, possibly formed in multiple stages.
The latter two end states can lead to strong gravitational-wave signals that
may be detectable in present continuous-wave searches with ground-based
detectors. We identify a very sharp boundary in the parameter space that
separates events with strong gravitational-wave emission from those with
negligible radiation.STFC Consolidator Grant No. ST/P000673/1
GWverse COST Action Grant No. CA16104
H2020-ERC-MaGRaThâ646597
NSF-XSEDE Grant No. PHY-090003
DiRRAC through STFC capital Grants No. ST/P002307/1 and No. ST/R002452/1, and STFC operations Grant No. ST/R00689X/
Black holes, gravitational waves and fundamental physics: a roadmap
The grand challenges of contemporary fundamental physicsâdark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problemâall involve gravity as a key component. And of all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some of the most remarkable predictions of General Relativity: event horizons, singularities and ergoregions.
The hitherto invisible landscape of the gravitational Universe is being unveiled before our eyes: the historical direct detection of gravitational waves by the LIGO-Virgo collaboration marks the dawn of a new era of scientific exploration. Gravitational-wave astronomy will allow us to test models of black hole formation, growth and evolution, as well as models of gravitational-wave generation and propagation. It will provide evidence for event horizons and ergoregions, test the theory of General Relativity itself, and may reveal the existence of new fundamental fields. The synthesis of these results has the potential to radically reshape our understanding of the cosmos and of the laws of Nature.
The purpose of this work is to present a concise, yet comprehensive overview of the state of the art in the relevant fields of research, summarize important open problems, and lay out a roadmap for future progress. This write-up is an initiative taken within the framework of the European Action on 'Black holes, Gravitational waves and Fundamental Physics'
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Stochastic gravitational wave background from supernovae in massive scalar-tensor gravity
In massive scalar-tensor gravity, core-collapse supernovae are strong sources of scalar-polarized gravitational waves. These can be detectable out to large distances. The dispersive nature of the propagation of waves in the massive scalar field implies that the gravitational wave signals are long-lived, and many such signals can overlap to form a stochastic background. Using different models for the population of supernova events in the nearby universe, we compute predictions for the energy density in the stochastic scalar-polarized gravitational wave background from core-collapse events in massive scalar-tensor gravity for theory parameters that facilitate strong scalarization. The resulting energy density is below the current constraints on a Gaussian stochastic gravitational wave background but large enough to be detectable with the current generation of detectors when they reach design sensitivity, indicating that it will soon be possible to place new constraints on the parameter space of massive scalar-tensor gravity
The proangiogenic effects of extracellular vesicles secreted by dental pulp stem cells derived from periodontally compromised teeth
Black holes, gravitational waves and fundamental physics: a roadmap
The grand challenges of contemporary fundamental physicsâdark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problemâall involve gravity as a key component. And of all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some of the most remarkable predictions of General Relativity: event horizons, singularities and ergoregions. The hitherto invisible landscape of the gravitational Universe is being unveiled before our eyes: the historical direct detection of gravitational waves by the LIGO-Virgo collaboration marks the dawn of a new era of scientific exploration. Gravitational-wave astronomy will allow us to test models of black hole formation, growth and evolution, as well as models of gravitational-wave generation and propagation. It will provide evidence for event horizons and ergoregions, test the theory of General Relativity itself, and may reveal the existence of new fundamental fields. The synthesis of these results has the potential to radically reshape our understanding of the cosmos and of the laws of Nature. The purpose of this work is to present a concise, yet comprehensive overview of the state of the art in the relevant fields of research, summarize important open problems, and lay out a roadmap for future progress. This write-up is an initiative taken within the framework of the European Action on 'Black holes, Gravitational waves and Fundamental Physics'