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Stochastic gravitational-wave background energy density spectrum of merging astrophysical and primordial BBHs (black). The fiducial model assumes combined BBH event rate normalized against LIGO and Virgo GWTC-2 events and branching ratios of each channel inferred by the model selection analysis of Franciolini et al. (2021). We show with individual lines the partial contribution of each considered channel: common envelope (CE, orange), stable mass transfer (SMT, green), globular cluster (GC, pink) and primordial black holes (PBH, blue). The upper constraint to the SGWB from GWTC-3 is indicated with a blue bar marker and an arrow. For comparison, we indicate with dashed lines the power-law integrated sensitivity curves of different detectors for corresponding continuous observation time. The detector configurations include LIGO-Virgo at design sensitivity (HLV), the same configuration including KAGRA with auto-correlations (HLVK auto-corr.), Einstein Telescope (ET) and the Laser Interferometer Space Array (LISA).

Stochastic gravitational-wave background as a tool for investigating multi-channel astrophysical and primordial black-hole mergers

Stochastic gravitational-wave background as a tool for investigating multi-channel astrophysical and primordial black-hole mergers Auteurs: Bavera, Fragos, Zapartas et al. (2022)   Abstract: The formation of merging binary black holes can occur through multiple astrophysical channels such as, e.g., isolated binary evolution and dynamical formation or, alternatively, have a primordial origin. Increasingly large gravitational-wave catalogs…
Joint distribution of the chirp mass [latex]M_mathrm{chirp}[/latex] and the effective inspiral spin parameter [latex]chi_mathrm{eff}[/latex] from isolated binary evolution. The model predictions for the underlying (intrinsic) binary black hole population is shown in gray where lighter colors represent larger contour levels of 90% and 99.9%, respectively. The sub-population of merging binary black holes which emitted long-duration gamma ray bursts is shown in blue. Overlaid in black are the ten LIGO and Virgo GWTC-2 data with chances [latex]p_mathrm{LGRB}^mathrm{GWTC-2} > 10 %[/latex] to have emitted a luminous long-duration gamma ray burst at binary black hole formation are indicated in black with their 90% credible intervals.

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Probing the progenitors of spinning binary black-hole mergers with long gamma-ray bursts Auteurs Bavera, Fragos, Zapartas et al. (2022) Abstract: Long-duration gamma-ray bursts are thought to be associated with the core-collapse of massive, rapidly spinning stars and the formation of black holes. However, efficient angular momentum transport in stellar interiors, currently supported by asteroseismic and…
Joint distribution of the chirp mass [latex]M_mathrm{chirp}[/latex] and the effective inspiral spin parameter [latex]chi_mathrm{eff}[/latex] from isolated binary evolution. The model predictions for the underlying (intrinsic) binary black hole population is shown in gray where lighter colors represent larger contour levels of 90% and 99.9%, respectively. The sub-population of merging binary black holes which emitted long-duration gamma ray bursts is shown in blue. Overlaid in black are the ten LIGO and Virgo GWTC-2 data with chances [latex]p_mathrm{LGRB}^mathrm{GWTC-2} > 10 %[/latex] to have emitted a luminous long-duration gamma ray burst at binary black hole formation are indicated in black with their 90% credible intervals.

Probing the progenitors of spinning binary black-hole mergers with long gamma-ray bursts

Probing the progenitors of spinning binary black-hole mergers with long gamma-ray bursts Auteurs: Bavera, Fragos, Zapartas et al. (2022) Abstract: Long-duration gamma-ray bursts are thought to be associated with the core-collapse of massive, rapidly spinning stars and the formation of black holes. However, efficient angular momentum transport in stellar interiors, currently supported by asteroseismic and…
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GWSC

Gravitational Wave Science Center

La mission du GWSC est d’encourager la recherche suisse dans le domaine des ondes gravitationnelles
et d’inspirer la prochaine génération de scientifiques à travers cette nouvelle fenêtre sur l’Univers.

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