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The gravitomagnetic monopole is the proposed gravitational analogue ofDirac's magnetic monopole. However, an observational evidence of this aspect offundamental physics was elusive. Here, we employ a technique involving threeprimary X-ray observational methods used to measure a black hole spin to searchfor the gravitomagnetic monopole. These independent methods give significantlydifferent spin values for an accreting black hole. We demonstrate that theinclusion of one extra parameter due to the gravitomagnetic monopole not onlymakes the spin and other parameter values inferred from the three methodsconsistent with each other but also makes the inferred black hole massconsistent with an independently measured value. We argue that this firstindication of the gravitomagnetic monopole, within our paradigm, is not aresult of fine tuning.

Does the gravitomagnetic monopole exist? A clue from a black hole x-ray binary