What question did this study set out to answer?

We aim to explore how CCEGA black stars function as perfect reflectors of gravitational waves and establish the underlying mechanisms.

May 25, 2026Open Access

P59: CCEGA Black Stars as Perfect Gravitational Wave Reflectors — Evanescent Interior and Frequency Cutoff

Key Points

We aim to explore how CCEGA black stars function as perfect reflectors of gravitational waves and establish the underlying mechanisms.
Theoretical model analysis of CCEGA black stars' interaction with gravitational waves.
Examination of the regge-wheeler potential barrier at the critical surface.
Development of a reflection signature dependent on mass and frequency cutoff.
CCEGA black stars are identified as perfect gravitational wave reflectors (R_eff = 1) at merger frequencies.
Waves with frequencies below f_cut(M) are evanescent due to potential barriers.
The frequency cutoff f_cut(M) varies from approximately 2,000 to 8,000 Hz and decreases with increasing mass.

Abstract

We show that CCEGA black stars are perfect gravitational wave reflectors (Rₑff = 1) for merger-frequency waves. The interior is evanescent for f < fcut (M) because the Regge-Wheeler potential barrier at the ρc surface prevents wave penetration. This establishes the physical mechanism for GW echoes in CCEGA. The spectral cutoff fcut (M) ≈ 2, 000–8, 000 Hz decreases monotonically with mass, providing a mass-dependent reflection signature developed further in P61.

P59: CCEGA Black Stars as Perfect Gravitational Wave Reflectors — Evanescent Interior and Frequency Cutoff

Key Points

Abstract

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