P42 Gravitational Flash in CCEGA: A Post-Merger Spectral Signature from Density-Dependent Gravity in NS-NS Mergers
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2026
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| _version_ | 1866901248132775936 |
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| author | López Sánchez, Marc |
| author_facet | López Sánchez, Marc |
| contents | <p>During the merger of two neutron stars, the remnant density transiently exceeds the CCEGA critical density ρc = 7.4 ρnuc. At this density, the effective gravitational coupling Geff(ρ) = GN exp(−ρ/ρc) drops to 0.368 GN, suppressing gravitational compression. We propose that this transient suppression produces a "gravitational flash": a brief period of reduced effective gravity during which the remnant undergoes a characteristic bounce. This bounce generates an additional spectral peak in the post-merger gravitational wave signal at fCCEGA ∼ 5 kHz — distinct from the dominant GR post-merger frequency f2 ∼ 2–3 kHz. Detection or non-detection of this peak by Einstein Telescope would constitute a direct test of the CCEGA gravitational coupling mechanism, independent of the maximum mass uncertainty. This paper presents the qualitative argument and order-of-magnitude estimates; full numerical verification requires relativistic hydrodynamics with variable Geff, left as future work.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_19380174 |
| institution | Zenodo |
| language | eng |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | P42 Gravitational Flash in CCEGA: A Post-Merger Spectral Signature from Density-Dependent Gravity in NS-NS Mergers López Sánchez, Marc gravitational waves, neutron star mergers, post-merger signal, density-dependent gravity, CCEGA, brane-world gravity, modified gravity, Einstein Telescope, spectral signatures, GW170817 <p>During the merger of two neutron stars, the remnant density transiently exceeds the CCEGA critical density ρc = 7.4 ρnuc. At this density, the effective gravitational coupling Geff(ρ) = GN exp(−ρ/ρc) drops to 0.368 GN, suppressing gravitational compression. We propose that this transient suppression produces a "gravitational flash": a brief period of reduced effective gravity during which the remnant undergoes a characteristic bounce. This bounce generates an additional spectral peak in the post-merger gravitational wave signal at fCCEGA ∼ 5 kHz — distinct from the dominant GR post-merger frequency f2 ∼ 2–3 kHz. Detection or non-detection of this peak by Einstein Telescope would constitute a direct test of the CCEGA gravitational coupling mechanism, independent of the maximum mass uncertainty. This paper presents the qualitative argument and order-of-magnitude estimates; full numerical verification requires relativistic hydrodynamics with variable Geff, left as future work.</p> |
| title | P42 Gravitational Flash in CCEGA: A Post-Merger Spectral Signature from Density-Dependent Gravity in NS-NS Mergers |
| topic | gravitational waves, neutron star mergers, post-merger signal, density-dependent gravity, CCEGA, brane-world gravity, modified gravity, Einstein Telescope, spectral signatures, GW170817 |
| url | https://doi.org/10.5281/zenodo.19380174 |