Probing Quadratic Gravity with Binary Inspirals

Kim, Yun‐Ho; Kobakhidze, Archil; Picker, Zachary S. C.

doi:10.48550/arxiv.1906.12034

Cited by 2 publications

(4 citation statements)

References 27 publications

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“…Given the constraints on parameters of quadratic gravity [23], we found that PBHs with even vanishing ADM mass can be stable. Furthermore, we argue that microlensing is less prominent for these black holes.…”

Section: Introductionmentioning

confidence: 94%

“…They cannot be calculated within the effective theory framework and must be extracted from observations. In [23] we obtained the following bounds on these parameters from the LIGO/Virgo gravitational wave data with the requirement of the absence of tachyonic instabilities:…”

Section: Static Spherically Symmetric Solutions In Quadratic Gravitymentioning

confidence: 99%

“…This puzzling behaviour is directly related to the inherent pathology of the effective quadratic gravity. Indeed, the parameter γ defines the mass of the spin-2 negative energy states, m π = M P / √ 2γ [23]. When the Hawking temperature exceeds m π 1 , the massive spin-2 particles are radiated away carrying out the negative energy and thus resulting in the increase of the black hole mass.…”

Section: Mass and Thermodynamics Of Non-schwarzschild Black Holesmentioning

confidence: 99%

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Non-Schwarzschild Primordial Black Holes as Dark Matter in Quadratic Gravity

Kim,

Kobakhidze

2021

Preprint

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One-loop renormalised quantum effective action for gravity contains quadratic in curvature terms. We have found an approximate analytic black hole solution in quadratic gravity by keeping only the radial spherically symmetric fluctuations and dimensionally reducing the 4-dimensional (4D) theory down to the 2-dimensional (2D) dilaton gravity with a potential. The solution reduces to the Schwarzschild black hole in the limit of Einstein's gravity, but otherwise admits non-negative Arnowitt-Deser-Misner (ADM) and positive quasi-local Misner-Sharp masses that can differ significantly. We then study the thermodynamics of such quantum corrected black holes and compute their lifetime under Hawking evaporation. We note that for some range of parameters, black holes increase in mass while emitting Hawking radiation. This pathological behaviour is related to the negative energy states that are present in quadratic gravity. We also find that the micro-lensing of non-Schwarzschild black holes could significantly deviate from the micro-lensing of their Schwarzschild counterparts. These findings have important ramifications for the phenomenology of primordial black holes (PBHs) as dark matter. In particular, the quoted constraints on PBH dark matter from micro-lensing data can be completely evaded, thus making PBHs in the mass range ∼ 10 −12 −10 M⊙ viable dark matter candidates.

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Section: Introductionmentioning

confidence: 94%

Section: Static Spherically Symmetric Solutions In Quadratic Gravitymentioning

confidence: 99%

Section: Mass and Thermodynamics Of Non-schwarzschild Black Holesmentioning

confidence: 99%

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Non-Schwarzschild Primordial Black Holes as Dark Matter in Quadratic Gravity

Kim,

Kobakhidze

2021

Preprint

Self Cite

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“…Dipole emission are present in the approach by Ref. [72] where PN correction to the R 2 -model are accounted for.…”

Section: A Energy-momentum Tensor and The Multipole Momentsmentioning

confidence: 99%

Gravitational waves in higher-order $R^{2}$ gravity

Vilhena,

Medeiros,

Cuzinatto

2021

Preprint

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We perform a comprehensive study of gravitational waves in the context of the higher-order quadratic-scalar-curvature gravity, which encompasses the ordinary Einstein-Hilbert term in the action plus a R 2 -contribution and a term of the type R R. The main focus is on gravitational waves emitted by binary systems such as binary black holes and binary pulsars in the approximation of circular orbits and non-relativistic motion. The waveform of higher-order gravitational waves from binary black holes is constructed and compared with the waveform predicted by standard general relativity; we conclude that the merger occurs before in our model than what would be expected from GR. The decreasing rate of the orbital period in binary pulsars is used to constraint the coupling parameters of our higher-order R 2 -gravity; this is done with Hulse-Taylor binary pulsar data leading to κ −1 0 1.1 × 10 16 m 2 , where κ −1 0 is the coupling constant for the R 2 -contribution.

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Probing Quadratic Gravity with Binary Inspirals

Cited by 2 publications

References 27 publications

Non-Schwarzschild Primordial Black Holes as Dark Matter in Quadratic Gravity

Non-Schwarzschild Primordial Black Holes as Dark Matter in Quadratic Gravity

Gravitational waves in higher-order $R^{2}$ gravity

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