The dominating mode of two competing massive modes of quadratic gravity

Chowdhury, Avijit; Xavier, Semin; Shankaranarayanan, S.

doi:10.1038/s41598-023-34802-8

Cited by 3 publications

(2 citation statements)

References 64 publications

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“…A phenomenological exploration of this predicted effect from quadratic gravity seems to be an intriguing idea. For other interesting predictions drawn from quadratic gravity which could be relevant for future gravitational-wave detections, see also [92].…”

Section: Causality Violation In Quadratic Gravitymentioning

confidence: 99%

Quantum gravity phenomenology from the perspective of quantum general relativity and quadratic gravity

Menezes

2023

Class. Quantum Grav.

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Multi-messenger astronomy provides us with the possibility of discovering phenomenological signatures of quantum-gravity effects. This should be of paramount importance in the pursuit of an elusive quantum theory for the gravitational interactions. Here we discuss feasible explorations within the effective field theory treatment of general relativity. By exploring current techniques borrowed from modern amplitude methods, we calculate leading quantum corrections to the classical radiated momentum and spectral waveforms. The lessons drawn from these low-energy results are that phenomenological applications in gravitational-wave physics can be discussed in line with the effective field theory approach. In turn, we also examine possible phenomenological surveys from the perspective of a UV completion for quantum gravity which employs the metric as the fundamental dynamical variable, namely quadratic gravity. Being more specific, by resorting to the eikonal approximation, we compute the leading-order time delay/advance in the scattering of light by a heavy object and find a possible significant deviation from the standard general-relativity prediction. This allows us to probe causal uncertainty due to quantum fluctuations of the gravitational field as a genuine prediction from Planck-scale physics.

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Section: Causality Violation In Quadratic Gravitymentioning

confidence: 99%

Quantum gravity phenomenology from the perspective of quantum general relativity and quadratic gravity

Menezes

2023

Class. Quantum Grav.

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“…Currently, two approaches are employed to distinguish GR from modified gravity theories in Electromagnetic and GW observations: First, identify modified gravity theories with the same BH solutions as GR. Then, obtain the difference in the GW signals from these two theories [25][26][27][28][29]. Second, obtain new BH solutions for modified gravity theories [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Infinitely degenerate slowly rotating solutions in f(R) gravity

Sunny,

Xavier,

Shankaranarayanan

2024

Class. Quantum Grav.

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This work tests the no-hair conjecture in f(R) gravity models. No-hair conjecture asserts that all black holes in General Relativity coupled to any matter must be Kerr–Newman type. However, the conjecture fails in some cases with non-linear matter sources. Here, we address this by explicitly constructing multiple slow-rotating black hole solutions, up to second order in rotational parameter, for a class of f(R) models ( f(R) =(\alpha_{0} + \alpha_{1}\,R)^{p}, p > 1). Such an f(R) includes all higher-powers of R. We analytically show that multiple vacuum solutions satisfy the field equations up to the second order in the rotational parameter. In other words, we show that the multiple vacuum solutions depend on arbitrary constants, which depend on the coupling parameters of the model. Hence, our results indicate that the no-hair theorem for modified gravity theories merits extending to include the coupling constants. The uniqueness of our result stems from the fact that these are obtained directly from metric formalism without conformal transformation. We discuss the kinematical properties of these black hole solutions and compare them with slow-rotating Kerr. Specifically, we show that the circular orbits for the black holes in f(R) are smaller than that of Kerr. This implies that the inner-most stable circular orbit for black holes in f(R) is smaller than Kerr's; hence, the shadow radius might also be smaller. Finally, we discuss the implications of our results for future observations.

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The dominating mode of two competing massive modes of quadratic gravity

Chowdhury

Xavier

Shankaranarayanan

2023

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Over the last two decades, motivations for modified gravity have emerged from both theoretical and observational levels. f(R) and Chern-Simons gravity have received more attention as they are the simplest generalization. However, f(R) and Chern-Simons gravity contain only an additional scalar (spin-0) degree of freedom and, as a result, do not include other modes of modified theories of gravity. In contrast, quadratic gravity (also referred to as Stelle gravity) is the most general second-order modification to 4-D general relativity and contains a massive spin-2 mode that is not present in f(R) and Chern-Simons gravity. Using two different physical settings—the gravitational wave energy-flux measured by the detectors and the backreaction of the emitted gravitational radiation on the spacetime of the remnant black hole—we demonstrate that massive spin-2 mode carries more energy than the spin-0 mode. Our analysis shows that the effects are pronounced for intermediate-mass black holes, which are prime targets for LISA.

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The dominating mode of two competing massive modes of quadratic gravity

Cited by 3 publications

References 64 publications

Quantum gravity phenomenology from the perspective of quantum general relativity and quadratic gravity

Quantum gravity phenomenology from the perspective of quantum general relativity and quadratic gravity

Infinitely degenerate slowly rotating solutions in f(R) gravity

The dominating mode of two competing massive modes of quadratic gravity

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