| black hole shadow | 108 | 13 | 7.0 | 0.01006 | 1906.02414,1906.03190,etc |
| entanglement entropy | 143 | 15 | 10.143 | 0.006235 | 1906.01927,1906.02211,etc |
| extra dimension | 89 | 13 | 4.75 | 0.00364 | 1906.00337,1906.04425,etc |
| black hole solution | 95 | 33 | 2.906 | 0.003523 | 1906.01152,1906.01977,etc |
| extremal black hole | 50 | 14 | 3.769 | 0.003132 | 1906.01479,1906.02346,etc |
| inflaton field | 75 | 17 | 4.625 | 0.002824 | 1906.00802,1906.01001,etc |
| Hamiltonian constraint | 53 | 12 | 4.545 | 0.00249 | 1906.01001,1906.01479,etc |
| massive particle | 66 | 25 | 2.667 | 0.002423 | 1906.00485,1906.01991,etc |
| initial datum | 170 | 29 | 5.429 | 0.002388 | 1906.00011,1906.00913,etc |
| Advanced LIGO | 29 | 11 | 2.7 | 0.002347 | 1906.00011,1906.00084,etc |
| black hole horizon | 91 | 31 | 2.933 | 0.002299 | 1906.00337,1906.01152,etc |
| Einstein frame | 96 | 11 | 5.3 | 0.00203 | 1906.02548,1906.04629,etc |
| large limit | 47 | 13 | 3.833 | 0.002001 | 1906.01735,1906.05442,etc |
| dark sector | 38 | 13 | 3.083 | 0.001967 | 1906.04465,1906.05668,etc |
| effective action | 89 | 15 | 6.286 | 0.001963 | 1906.02507,1906.06990,etc |
| first integral | 73 | 12 | 4.091 | 0.001893 | 1906.03630,1906.03635,etc |
| curved spacetime | 62 | 26 | 2.28 | 0.00186 | 1906.00063,1906.00337,etc |
| path integral | 46 | 11 | 3.7 | 0.001849 | 1906.02414,1906.02507,etc |
| boundary term | 86 | 20 | 4.474 | 0.001744 | 1906.00027,1906.02801,etc |
| Kerr spacetime | 96 | 19 | 5.278 | 0.001729 | 1906.00838,1906.00913,etc |
| massive scalar field | 51 | 18 | 2.882 | 0.001724 | 1906.00420,1906.01979,etc |
| scalar-tensor theory | 48 | 21 | 2.35 | 0.001685 | 1906.02498,1906.04629,etc |
| free scalar field | 25 | 11 | 2.3 | 0.00162 | 1906.02921,1906.08835,etc |
| dynamical system | 67 | 17 | 4.125 | 0.001592 | 1906.00027,1906.02548,etc |
| conformal boundary | 63 | 12 | 5.636 | 0.001584 | 1906.03379,1906.10777,etc |
| density contrast | 59 | 13 | 4.0 | 0.001569 | 1906.00730,1906.04162,etc |
| boundary condition | 343 | 77 | 4.474 | 0.001516 | 1906.00063,1906.00337,etc |
| second fundamental form | 37 | 11 | 2.6 | 0.001454 | 1906.07190,1906.07559,etc |
| gravity theory | 104 | 40 | 2.615 | 0.001452 | 1906.00027,1906.00450,etc |
| light ray | 75 | 22 | 3.381 | 0.001448 | 1906.02414,1906.02879,etc |
| mass parameter | 51 | 21 | 2.5 | 0.001409 | 1906.01052,1906.01152,etc |
| cosmological constant problem | 30 | 11 | 2.8 | 0.001408 | 1906.00027,1906.00337,etc |
| quantum field theory | 107 | 46 | 2.333 | 0.00133 | 1906.00027,1906.01052,etc |
| analytic continuation | 55 | 13 | 4.417 | 0.001291 | 1906.04856,1906.07232,etc |
| horizon radius | 46 | 18 | 2.647 | 0.00128 | 1906.00838,1906.01152,etc |
| quasinormal mode | 53 | 17 | 3.188 | 0.001262 | 1906.00603,1906.00838,etc |
| nonumber & | 84 | 32 | 2.645 | 0.001245 | 1906.01735,1906.02414,etc |
| delta function | 58 | 13 | 4.75 | 0.001231 | 1906.09278,1906.00989,etc |
| Schwarzschild spacetime | 90 | 18 | 5.176 | 0.001208 | 1906.00485,1906.00603,etc |
| null energy condition | 24 | 11 | 2.3 | 0.00115 | 1906.04048,1906.04360,etc |
| analytical expression | 32 | 16 | 2.067 | 0.001132 | 1906.01441,1906.05090,etc |
| spatial infinity | 59 | 22 | 2.762 | 0.001129 | 1906.00838,1906.01441,etc |
| present value | 22 | 11 | 2.1 | 0.001128 | 1906.00450,1906.02548,etc |
| black hole mass | 42 | 18 | 2.353 | 0.001119 | 1906.00420,1906.03190,etc |
| exact solution | 88 | 40 | 2.231 | 0.001107 | 1906.00027,1906.00450,etc |
| Hamilton-Jacobi equation | 34 | 11 | 2.2 | 0.001098 | 1906.03566,1906.03790,etc |
| geodesic equation | 75 | 22 | 3.333 | 0.001083 | 1906.01991,1906.02414,etc |
| field redefinition | 45 | 13 | 3.667 | 0.001067 | 1906.03790,1906.05155,etc |
| coherent state | 41 | 11 | 4.0 | 0.001036 | 1906.02211,1906.02759,etc |
| stable solution | 29 | 11 | 2.8 | 0.001026 | 1906.00027,1906.00420,etc |
| energy-momentum tensor | 143 | 52 | 2.745 | 0.000975 | 1906.00027,1906.00063,etc |
| present time | 41 | 17 | 2.5 | 0.000972 | 1906.01970,1906.02548,etc |
| finite temperature | 33 | 13 | 2.167 | 0.000923 | 1906.00063,1906.01927,etc |
| linear order | 73 | 31 | 2.4 | 0.0009 | 1906.01001,1906.01977,etc |
| first law | 83 | 26 | 3.28 | 0.000898 | 1906.01152,1906.03334,etc |
| order term | 67 | 27 | 2.538 | 0.000879 | 1906.01735,1906.05673,etc |
| total action | 28 | 13 | 2.25 | 0.000874 | 1906.02507,1906.03140,etc |
| thermodynamic property | 38 | 16 | 2.4 | 0.000859 | 1906.01331,1906.01970,etc |
| kinetic term | 68 | 33 | 2.094 | 0.000858 | 1906.00337,1906.02507,etc |
| imaginary part | 89 | 34 | 2.667 | 0.000854 | 1906.00603,1906.00913,etc |
| power law | 48 | 15 | 3.357 | 0.000853 | 1906.00802,1906.01735,etc |
| Einstein gravity | 81 | 22 | 3.81 | 0.000842 | 1906.00420,1906.01152,etc |
| quantum correction | 38 | 17 | 2.312 | 0.000836 | 1906.00603,1906.01970,etc |
| metric function | 76 | 30 | 2.586 | 0.000816 | 1906.00420,1906.00485,etc |
| Poisson bracket | 60 | 14 | 4.385 | 0.000805 | 1906.02921,1906.03630,etc |
| nonumber && | 65 | 16 | 4.267 | 0.000795 | 1906.00343,1906.00404,etc |
| complex scalar field | 29 | 14 | 2.154 | 0.000788 | 1906.00420,1906.05386,etc |
| two-point function | 46 | 11 | 3.0 | 0.000769 | 1906.05406,1906.05686,etc |
| conformal factor | 51 | 21 | 2.35 | 0.000725 | 1906.00011,1906.00913,etc |
| numerical datum | 27 | 13 | 2.083 | 0.000725 | 1906.00838,1906.01735,etc |
| spherical symmetry | 73 | 36 | 2.057 | 0.000722 | 1906.00913,1906.01052,etc |
| analytical solution | 37 | 14 | 2.077 | 0.000706 | 1906.00420,1906.01001,etc |
| effective mass | 32 | 12 | 2.727 | 0.000689 | 1906.00802,1906.01001,etc |
| electric field | 69 | 23 | 2.409 | 0.000681 | 1906.01977,1906.01991,etc |
| matter source | 30 | 12 | 2.636 | 0.000681 | 1906.03872,1906.04048,etc |
| commutation relation | 31 | 11 | 3.0 | 0.000657 | 1906.02921,1906.04856,etc |
| flat spacetime | 83 | 41 | 2.05 | 0.000651 | 1906.00063,1906.00802,etc |
| gravity model | 36 | 16 | 2.267 | 0.000646 | 1906.00027,1906.00485,etc |
| classical limit | 25 | 11 | 2.3 | 0.000638 | 1906.01001,1906.03630,etc |
| line element | 129 | 60 | 2.169 | 0.000608 | 1906.00063,1906.00404,etc |
| stress-energy tensor | 56 | 27 | 2.038 | 0.000601 | 1906.00027,1906.01331,etc |
| matter field | 112 | 51 | 2.18 | 0.00057 | 1906.00011,1906.01001,etc |
| quantum theory | 64 | 25 | 2.625 | 0.000551 | 1906.00404,1906.01001,etc |
| Schwarzschild case | 36 | 16 | 2.333 | 0.000548 | 1906.00343,1906.03718,etc |
| effective theory | 36 | 17 | 2.125 | 0.000537 | 1906.00404,1906.02507,etc |
| complex plane | 32 | 11 | 2.6 | 0.000533 | 1906.01441,1906.03334,etc |
| inner product | 51 | 21 | 2.5 | 0.000523 | 1906.01352,1906.02414,etc |
| Einstein' equation | 72 | 28 | 2.593 | 0.000504 | 1906.00027,1906.00913,etc |
| last line | 24 | 12 | 2.091 | 0.0005 | 1906.02414,1906.05686,etc |
| mode function | 26 | 11 | 2.3 | 0.000486 | 1906.01735,1906.02507,etc |
| symplectic form | 29 | 11 | 2.5 | 0.000452 | 1906.01001,1906.02801,etc |
| Klein-Gordon equation | 54 | 23 | 2.364 | 0.000438 | 1906.00802,1906.01001,etc |
| quantum number | 32 | 11 | 2.7 | 0.000419 | 1906.02507,1906.03116,etc |
| electromagnetic counterpart | 31 | 12 | 2.455 | 0.00037 | 1906.00084,1906.02184,etc |