Gravitational Atoms
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In this article, the authors investigated the possibility of having an observable signal of gravitational waves or ultra high energy cosmic rays from the decay of gravitational atoms, and showed that if ordinary Einstein gravity holds up to the Planck scale, then, within the Lambda \text{CDM}$ model, the frequency of the gravitational wave signal produced by the decays is always higher than $10−13, \,Abstract:
Particles in a yet unexplored dark sector with sufficiently large mass and small gauge coupling may form purely gravitational atoms (quantum gravitational bound states) with a rich phenomenology. In particular, we investigate the possibility of having an observable signal of gravitational waves or ultra high energy cosmic rays from the decay of gravitational atoms. We show that if ordinary Einstein gravity holds up to the Planck scale, then, within the $\Lambda \text{CDM}$ model, the frequency of the gravitational wave signal produced by the decays is always higher than $10^{13} \, \text{Hz}$. An observable signal of gravitational waves with smaller frequency from such decays, in addition to probing near Planckian dark physics, would also imply a departure from Einstein gravity near the Planck scale or an early epoch of non-standard cosmology. As an example, we consider an early universe cosmology with a matter-dominated phase, violating our assumption that the universe is radiation dominated after reheating, which gives a signal in an interesting frequency range for near Planckian bound states. We also show how gravitational atoms arise in the minimal PIDM scenario and compute their gravitational wave signature.read more
Citations
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Testing the equivalence principle via the shadow of black holes
Sheng Feng Yan,Chunlong Li,Lingqin Xue,Xin Ren,Yi-Fu Cai,Damien A. Easson,Ye Fei Yuan,HongSheng Zhao,HongSheng Zhao +8 more
TL;DR: In this paper, D.A.Z. acknowledges support from the USTC fellowship for international visiting professors and from Shanghai Astronomical Observatory, and is supported in part by the Foundational Questions Institute.
Journal ArticleDOI
Testing the equivalence principle via the shadow of black holes
Chunlong Li,Sheng-Feng Yan,Lingqin Xue,Xin Ren,Yi-Fu Cai,Damien A. Easson,Ye Fei Yuan,HongSheng Zhao +7 more
TL;DR: In this article, the equivalence principle of black hole shadows is studied by analyzing the deformation observable of shadow at different wavelengths by a different amount, and therefore observations of the shadow in different wavelengths could constrain such couplings.
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Probing dynamics of boson stars by fast radio bursts and gravitational wave detection
TL;DR: In this article, Liouville and logarithmic scalar self-interaction potentials were used as benchmarks to study the dynamics of a boson star with respect to the Landscape of a quantum gravity.
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New test on the Einstein equivalence principle through the photon ring of black holes
TL;DR: In this paper, the authors used the NSFC (Nos. 11653002, 11961131007, 11722327,1201101448, 11421303), CAST (2016QNRC001), by the National Thousand Talents Program of China, by the Fundamental Research Funds for Central Universities, and by the USTC Fellowship for international cooperation.
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Gravitational absorption lines
TL;DR: In this article, the authors considered the gravitational analogue of Lyman-alpha absorption lines in astronomical spectroscopy and provided a non-minimal coupling of the matter fields which breaks the equivalence principle on-shell.
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