Pulsar–black hole binaries as a window on quantum gravity

Estes, John; Kavic, Michael; Lippert, Matthew; Simonetti, J. H.

doi:10.1142/s0218271817430040

Cited by 3 publications

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“…However, observations of a pulsar orbiting a black hole have the potential to set even better limits, given the greater observational precision obtainable. BH-pulsar binaries have been argued to provide remarkable tests of quantum gravity [43][44][45][46][47][48][49] on top of their proven record in testing Einstein's general relativity in the case of the Hulse-Taylor BH-pulsar binary PSR B1913+16 [50]. The precision on measured orbital parameters for pulsars is determined by the precision on pulse "times of arrival" (TOA) measurements, which is typically σ T OA ∼ 1µs [51].…”

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Sensitive searches for wormholes

et al. 2021

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The realm of strong classical gravity and perhaps even quantum gravity are waiting to be explored. In this letter we consider the recently detected triple system composed of two stars and a nonaccreting black hole. Using published observations of this system we conduct the most sensitive test to date for whether the black hole is actually a wormhole by looking for orbital perturbations due to an object on the other side of the wormhole. The mass limit obtained on the perturber is ∼ 4 orders of magnitude better than for observations of S2 orbiting the supermassive black hole at Sgr A*. We also consider how observations of a pulsar could test for whether the black hole in a pulsar-black hole binary is a wormhole. A pulsar in a similar orbit to S2 would be ∼ 10 orders of magnitude more sensitive than observations of S2. For a nominal pulsar-black hole binary of stellar masses, with orbital size similar to that of the Hulse-Taylor binary pulsar, one year of observations could set a mass limit on a perturber that is ∼ 6 orders of magnitude better than observations of a pulsar around Sgr A*. A range of limits between the pulsar-Sgr A* and Hulse-Taylor cases could be obtained for a possible population of pulsar-black hole binaries that may exist near the galactic center.

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confidence: 99%

Sensitive searches for wormholes

et al. 2021

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“…Observations of a pulsar orbiting a black hole have the potential to set even better limits, given the greater observational precision attainable. Black hole-pulsar binaries have been argued to provide remarkable tests of quantum gravity [63][64][65][66][67][68][69] on top of their proven record in testing Einstein's general relativity in the case of the Hulse-Taylor binary pulsar PSR 1913+16 [70].…”

Section: Orbiting Starsmentioning

confidence: 99%