| 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 |
| black hole | 1699 | 168 | 10.138 | 0.005905 | 1906.00011,1906.00027,etc |
| time delay | 144 | 15 | 10.143 | 0.005682 | 1906.01153,1906.04197,etc |
| gravitational radiation | 59 | 23 | 2.636 | 0.00501 | 1906.00084,1906.00913,etc |
| critical point | 240 | 21 | 11.9 | 0.004159 | 1906.00027,1906.00337,etc |
| extra dimension | 89 | 13 | 4.75 | 0.00364 | 1906.00337,1906.04425,etc |
| luminosity distance | 144 | 16 | 7.933 | 0.003629 | 1906.00450,1906.02879,etc |
| time scale | 85 | 23 | 3.773 | 0.003528 | 1906.03190,1906.03624,etc |
| black hole solution | 95 | 33 | 2.906 | 0.003523 | 1906.01152,1906.01977,etc |
| test particle | 80 | 27 | 3.0 | 0.003484 | 1906.00343,1906.00485,etc |
| harmonic oscillator | 62 | 11 | 4.8 | 0.003381 | 1906.00343,1906.01001,etc |
| density matrix | 75 | 16 | 4.6 | 0.003318 | 1906.01927,1906.02211,etc |
| neutron star | 238 | 52 | 4.49 | 0.003311 | 1906.00011,1906.00027,etc |
| gravitational wave | 355 | 116 | 3.07 | 0.003203 | 1906.00011,1906.00063,etc |
| extremal black hole | 50 | 14 | 3.769 | 0.003132 | 1906.01479,1906.02346,etc |
| supermassive black hole | 73 | 26 | 2.88 | 0.002912 | 1906.02744,1906.03190,etc |
| inflaton field | 75 | 17 | 4.625 | 0.002824 | 1906.00802,1906.01001,etc |
| scale factor | 230 | 60 | 3.78 | 0.002592 | 1906.00027,1906.00404,etc |
| magnetic field | 118 | 23 | 5.318 | 0.002566 | 1906.00337,1906.03566,etc |
| Hubble parameter | 140 | 46 | 3.089 | 0.00252 | 1906.00027,1906.00450,etc |
| energy condition | 74 | 15 | 5.214 | 0.00249 | 1906.00063,1906.04048,etc |
| Hamiltonian constraint | 53 | 12 | 4.545 | 0.00249 | 1906.01001,1906.01479,etc |
| circular orbit | 64 | 23 | 2.864 | 0.002453 | 1906.00343,1906.00485,etc |
| massive particle | 66 | 25 | 2.667 | 0.002423 | 1906.00485,1906.01991,etc |
| scalar field | 809 | 124 | 6.528 | 0.002406 | 1906.00027,1906.00337,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 |
| free energy | 97 | 14 | 7.308 | 0.002341 | 1906.01970,1906.03140,etc |
| black hole horizon | 91 | 31 | 2.933 | 0.002299 | 1906.00337,1906.01152,etc |
| tidal effect | 38 | 11 | 3.3 | 0.002261 | 1906.00011,1906.00485,etc |
| power spectrum | 195 | 27 | 7.269 | 0.002258 | 1906.00802,1906.01001,etc |
| accretion disk | 32 | 13 | 2.583 | 0.002177 | 1906.04847,1906.05673,etc |
| energy density | 342 | 99 | 3.459 | 0.002103 | 1906.00027,1906.00063,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 |
| ground state | 91 | 21 | 4.5 | 0.001997 | 1906.00420,1906.01152,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 |
| Hawking radiation | 70 | 25 | 2.875 | 0.001938 | 1906.01735,1906.01927,etc |
| dark energy | 208 | 60 | 3.508 | 0.001918 | 1906.00027,1906.00450,etc |
| first integral | 73 | 12 | 4.091 | 0.001893 | 1906.03630,1906.03635,etc |
| orbital period | 43 | 13 | 3.5 | 0.001885 | 1906.00485,1906.05309,etc |
| phase space | 195 | 38 | 5.243 | 0.001863 | 1906.00027,1906.00485,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 |
| dark matter | 181 | 60 | 2.966 | 0.001813 | 1906.00027,1906.00063,etc |
| boundary term | 86 | 20 | 4.474 | 0.001744 | 1906.00027,1906.02801,etc |
| gauge field | 42 | 18 | 2.412 | 0.001739 | 1906.00337,1906.01970,etc |
| phase transition | 141 | 27 | 5.308 | 0.001732 | 1906.01152,1906.01970,etc |
| Kerr spacetime | 96 | 19 | 5.278 | 0.001729 | 1906.00838,1906.00913,etc |
| Hilbert space | 101 | 24 | 4.348 | 0.001728 | 1906.01352,1906.01927,etc |
| massive scalar field | 51 | 18 | 2.882 | 0.001724 | 1906.00420,1906.01979,etc |
| vector field | 157 | 45 | 3.545 | 0.001719 | 1906.00337,1906.00404,etc |
| field equation | 226 | 71 | 3.2 | 0.001704 | 1906.00027,1906.00337,etc |
| impact parameter | 83 | 21 | 4.05 | 0.001698 | 1906.02414,1906.03190,etc |
| scalar-tensor theory | 48 | 21 | 2.35 | 0.001685 | 1906.02498,1906.04629,etc |
| equatorial plane | 124 | 31 | 4.1 | 0.001681 | 1906.00343,1906.00420,etc |
| high redshift | 32 | 11 | 2.9 | 0.001653 | 1906.03790,1906.11833,etc |
| Killing vector | 106 | 26 | 4.2 | 0.001644 | 1906.01991,1906.02414,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 |
| rest frame | 33 | 16 | 2.067 | 0.001567 | 1906.00404,1906.01331,etc |
| primordial black hole | 43 | 19 | 2.056 | 0.001526 | 1906.02744,1906.02879,etc |
| boundary condition | 343 | 77 | 4.474 | 0.001516 | 1906.00063,1906.00337,etc |
| initial condition | 221 | 67 | 3.318 | 0.001512 | 1906.00343,1906.00802,etc |
| mass function | 84 | 20 | 4.368 | 0.00151 | 1906.00063,1906.00485,etc |
| event horizon | 245 | 72 | 3.423 | 0.001506 | 1906.00063,1906.00603,etc |
| wave equation | 92 | 20 | 4.579 | 0.001505 | 1906.00603,1906.02184,etc |
| quantum gravity | 142 | 59 | 2.414 | 0.0015 | 1906.00603,1906.01152,etc |
| Hawking temperature | 52 | 23 | 2.273 | 0.001488 | 1906.01927,1906.02958,etc |
| angular momentum | 254 | 70 | 3.623 | 0.001466 | 1906.00343,1906.00420,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 |
| deceleration parameter | 43 | 13 | 3.333 | 0.001444 | 1906.00450,1906.02879,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 |
| perfect fluid | 114 | 38 | 3.054 | 0.001395 | 1906.00027,1906.00450,etc |
| quantum fluctuation | 57 | 19 | 3.111 | 0.001361 | 1906.00027,1906.02211,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 |
| gravitational field | 110 | 50 | 2.224 | 0.001286 | 1906.00027,1906.00343,etc |
| compact binary | 31 | 15 | 2.143 | 0.001286 | 1906.00084,1906.00485,etc |
| binary system | 80 | 31 | 2.633 | 0.001284 | 1906.00011,1906.00485,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 |
| proper time | 82 | 32 | 2.516 | 0.001248 | 1906.00343,1906.00404,etc |
| covariant derivative | 54 | 11 | 5.1 | 0.001245 | 1906.00027,1906.01331,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 |
| energy flux | 36 | 18 | 2.059 | 0.00122 | 1906.00802,1906.02958,etc |
| curvature perturbation | 46 | 15 | 3.214 | 0.001216 | 1906.01991,1906.02759,etc |
| Schwarzschild spacetime | 90 | 18 | 5.176 | 0.001208 | 1906.00485,1906.00603,etc |
| black hole entropy | 28 | 11 | 2.4 | 0.001164 | 1906.03334,1906.05536,etc |
| null energy condition | 24 | 11 | 2.3 | 0.00115 | 1906.04048,1906.04360,etc |
| string theory | 80 | 40 | 2.026 | 0.001149 | 1906.00337,1906.01970,etc |
| initial state | 61 | 24 | 2.609 | 0.001133 | 1906.01927,1906.01979,etc |
|