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Milne model

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759: 89: 2377: 772: 25: 817: 917:(FLRW). The Milne solution can be obtained from the more generic FLRW model by demanding that the energy density, pressure and cosmological constant all equal zero and the spatial curvature is negative. From these assumptions and the Friedmann equations it follows that the scale factor must depend on time coordinate linearly. 1277:
Milne proposed that the universe's density changes in time because of an initial outward explosion of matter. Milne's model assumes an inhomogeneous density function which is Lorentz Invariant (around the event t=x=y=z=0). When rendered graphically Milne's density distribution shows a
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The empty space that the Milne model describes can be identified with the inside of a light cone of an event in Minkowski space by a change of coordinates.
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pattern with outer edges moving outward at the speed of light. Every inertial body perceives itself to be at the center of the explosion of matter (see
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Setting the spatial curvature and speed of light to unity the metric for a Milne universe can be expressed with hyperspherical coordinates as:
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to Milne's model implies that a full general relativistic treatment using Milne's assumptions would result in a linearly increasing
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A thorough historical and theoretical study of the British Tradition in Cosmology, and one long celebration of Milne.
195: 64: 1219:. As he initially described it, the model has no expansion of space, so all of the redshift (except that caused by 2133: 758: 475: 88: 1846: 1349: 382: 1949: 2380: 2122: 2027: 1957: 469: 177: 2090: 515: 2409: 1944: 1298: 535: 1134: 1985: 1719: 1704: 776: 267: 187: 2272: 1714: 1667: 875: 680: 228: 46: 35: 2302: 1928: 1609: 480: 292: 2414: 2327: 1877: 1637: 1548: 715: 705: 555: 372: 2056: 1978: 1598: 1589: 890: 700: 434: 1227:
associated with the hypothetical "explosion". However, the mathematical equivalence of the zero
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Non-Standard Relativity: a Philosopher's Handbook of Heresies in Physics
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Misner, Charles W.; Thorne, Kip S.; Wheeler, John Archibald (1971).
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Since it features both zero energy density and maximally negative
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in 1935. It is mathematically equivalent to a special case of the
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Spacetime and geometry: an introduction to general relativity
816: 1401:(1st ed.). San Francisco: Addison Wesley. p. 341. 1953: 1466:(1st ed.). San Francisco: W. H. Freeman. p. 721. 1500:- a detailed non-technical introduction to the Milne model 1301:
at all times for which the Milne model is taken to apply.
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The Milne universe is a special case of a more general
1237: 1188: 1137: 1050: 929: 98: 45:. Please help to ensure that disputed statements are 1461: 1249: 1197: 1167: 1117: 1030: 154: 1350:"Planck 2018 results VI. Cosmological parameters" 2391: 893:. Cosmologists actually observe the universe's 1549: 797: 1503: 1491:Milne Cosmology: Why I Keep Talking About It 1360:. Astronomy & Astrophysics Journal: A6. 1347: 1324:Relativity, Gravitation and World-structure 1272: 820:Milne's model follows the description from 1556: 1542: 1211:Milne developed this model independent of 804: 790: 1422: 1420: 1418: 1365: 915:Friedmann–LemaĂźtre–Robertson–Walker model 65:Learn how and when to remove this message 1426: 901:and its curvature to be consistent with 815: 41:Relevant discussion may be found on the 1396: 1348:Planck Collaboration (September 2020). 889:, the Milne model is inconsistent with 2392: 1455: 1415: 2405:Exact solutions in general relativity 1537: 1390: 1317: 870:. The Milne model is also similar to 1168:{\displaystyle \chi =\sinh ^{-1}{r}} 836:along with "elsewhere" in spacetime. 18: 2128:Tolman–Oppenheimer–Volkoff equation 2081:Friedmann–LemaĂźtre–Robertson–Walker 1269:is uniquely zero for such a model. 1128:is the metric for a two-sphere and 13: 1192: 1055: 1013: 115: 14: 2426: 1898:Hamilton–Jacobi–Einstein equation 1430:Physical foundations of cosmology 2376: 2375: 771: 770: 757: 87: 23: 1293:In order to be consistent with 908: 1705:Mass–energy equivalence (E=mc) 1563: 1341: 1311: 1022: 972: 1: 1504:True Wegener, Mogens (2021). 1484: 2400:Obsolete theories in physics 1354:Astronomy & Astrophysics 1278:three-dimensional spherical 7: 1720:Relativistic Doppler effect 1384:10.1051/0004-6361/201833910 874:in that both are simple re- 832:containing past and future 268:Gravitational time dilation 10: 2431: 2191:In computational physics: 1715:Relativity of simultaneity 388:Mathisson–Papapetrou–Dixon 229:Pseudo-Riemannian manifold 2373: 2205: 2070: 2042: 2028:Lense–Thirring precession 1911: 1860: 1822: 1801: 1790: 1748: 1692: 1676: 1618: 1610:Doubly special relativity 1582: 1571: 1516:10.1515/9783110813531-031 1496:12 September 2006 at the 891:cosmological observations 1888:Post-Newtonian formalism 1878:Einstein field equations 1814:Mathematical formulation 1638:Hyperbolic orthogonality 1427:Mukhanov, V. F. (2005). 1304: 1273:Milne's density function 1198:{\displaystyle +\infty } 393:Hamilton–Jacobi–Einstein 373:Einstein field equations 196:Mathematical formulation 1599:Galilean transformation 1590:Principle of relativity 1376:2020A&A...641A...6P 1265:for all time since the 1250:{\displaystyle \rho =0} 1684:Lorentz transformation 1397:Carroll, Sean (2004). 1288:cosmological principle 1267:deceleration parameter 1251: 1215:but with awareness of 1199: 1169: 1119: 1032: 897:to be consistent with 868:cosmological principle 837: 263:Gravitational redshift 156: 2152:Weyl−Lewis−Papapetrou 1893:Raychaudhuri equation 1832:Equivalence principle 1252: 1200: 1170: 1120: 1033: 862:in the limit of zero 819: 551:Weyl−Lewis−Papapetrou 506:Kerr–Newman–de Sitter 326:Einstein–Rosen bridge 258:Gravitational lensing 214:Equivalence principle 157: 2193:Numerical relativity 2034:pulsar timing arrays 1319:Milne, Edward Arthur 1235: 1225:recessional velocity 1223:) is explained by a 1186: 1135: 1048: 927: 846:special-relativistic 481:Einstein–Rosen waves 207:Fundamental concepts 96: 34:factual accuracy is 2410:Minkowski spacetime 2085:Friedmann equations 1979:Hulse–Taylor binary 1941:Gravitational waves 1837:Riemannian geometry 1663:Proper acceleration 1648:Maxwell's equations 1594:Galilean relativity 1510:. Books on Demand. 1327:. Clarendon Press. 1284:observable universe 1221:peculiar velocities 856:Edward Arthur Milne 826:observable universe 435:Kaluza–Klein theory 321:Minkowski spacetime 273:Gravitational waves 2134:Reissner–Nordström 2052:Brans–Dicke theory 1883:Linearized gravity 1710:Length contraction 1628:Frame of reference 1605:Special relativity 1295:general relativity 1247: 1217:special relativity 1213:general relativity 1195: 1165: 1115: 1028: 838: 822:special relativity 764:Physics portal 536:Oppenheimer–Snyder 476:Reissner–Nordström 368:Linearized gravity 316:Spacetime diagrams 219:Special relativity 152: 81:General relativity 16:Cosmological model 2387: 2386: 2201: 2200: 2180:OzsvĂĄth–SchĂŒcking 1786: 1785: 1768:Minkowski diagram 1725:Thomas precession 1668:Relativistic mass 1473:978-0-7167-0334-1 1440:978-0-521-56398-7 1408:978-0-8053-8732-2 1334:978-0-598-42415-0 1257:) version of the 1114: 1027: 895:density parameter 887:spatial curvature 876:parameterizations 866:and it obeys the 830:spacetime diagram 814: 813: 447: 446: 333: 332: 75: 74: 67: 2422: 2379: 2378: 2162:van Stockum dust 1934:Two-body problem 1852:Mach's principle 1799: 1798: 1740:Terrell rotation 1580: 1579: 1558: 1551: 1544: 1535: 1534: 1529: 1478: 1477: 1459: 1453: 1452: 1424: 1413: 1412: 1394: 1388: 1387: 1369: 1345: 1339: 1338: 1315: 1299:critical density 1256: 1254: 1253: 1248: 1204: 1202: 1201: 1196: 1174: 1172: 1171: 1166: 1164: 1156: 1155: 1124: 1122: 1121: 1116: 1112: 1111: 1110: 1092: 1091: 1079: 1078: 1063: 1062: 1037: 1035: 1034: 1029: 1025: 1021: 1020: 1008: 1000: 999: 987: 986: 971: 970: 958: 957: 942: 941: 806: 799: 792: 779: 774: 773: 766: 762: 761: 546:van Stockum dust 531:Robertson–Walker 357: 356: 247: 246: 161: 159: 158: 153: 151: 150: 138: 130: 129: 111: 110: 91: 77: 76: 70: 63: 59: 56: 50: 47:reliably sourced 27: 26: 19: 2430: 2429: 2425: 2424: 2423: 2421: 2420: 2419: 2415:1935 in science 2390: 2389: 2388: 2383: 2369: 2197: 2101:BKL singularity 2091:LemaĂźtre–Tolman 2066: 2062:Quantum gravity 2044: 2038: 2024:geodetic effect 1998:(together with 1968:LISA Pathfinder 1907: 1856: 1842:Penrose diagram 1824: 1818: 1793: 1782: 1778:Minkowski space 1744: 1688: 1672: 1620: 1614: 1574: 1567: 1562: 1526: 1498:Wayback Machine 1487: 1482: 1481: 1474: 1460: 1456: 1441: 1425: 1416: 1409: 1395: 1391: 1346: 1342: 1335: 1316: 1312: 1307: 1275: 1236: 1233: 1232: 1187: 1184: 1183: 1160: 1148: 1144: 1136: 1133: 1132: 1106: 1102: 1087: 1083: 1074: 1070: 1058: 1054: 1049: 1046: 1045: 1016: 1012: 1004: 995: 991: 982: 978: 966: 962: 953: 949: 937: 933: 928: 925: 924: 911: 880:Minkowski space 810: 769: 756: 755: 748: 747: 571: 570: 561: 560: 516:LemaĂźtre–Tolman 461: 460: 449: 448: 440:Quantum gravity 427:Advanced theory 354: 353: 352: 335: 334: 283:Geodetic effect 244: 243: 234: 233: 209: 208: 192: 162: 143: 139: 134: 122: 118: 103: 99: 97: 94: 93: 71: 60: 54: 51: 40: 32:This article's 28: 24: 17: 12: 11: 5: 2428: 2418: 2417: 2412: 2407: 2402: 2385: 2384: 2374: 2371: 2370: 2368: 2367: 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1732: 1730:Ladder paradox 1727: 1722: 1717: 1712: 1707: 1702: 1696: 1694: 1690: 1689: 1687: 1686: 1680: 1678: 1674: 1673: 1671: 1670: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1633:Speed of light 1630: 1624: 1622: 1616: 1615: 1613: 1612: 1607: 1602: 1596: 1586: 1584: 1577: 1569: 1568: 1561: 1560: 1553: 1546: 1538: 1532: 1531: 1525:978-8743031420 1524: 1501: 1486: 1483: 1480: 1479: 1472: 1454: 1439: 1414: 1407: 1389: 1340: 1333: 1309: 1308: 1306: 1303: 1274: 1271: 1246: 1243: 1240: 1229:energy density 1194: 1191: 1176: 1175: 1163: 1159: 1154: 1151: 1147: 1143: 1140: 1126: 1125: 1109: 1105: 1101: 1098: 1095: 1090: 1086: 1082: 1077: 1073: 1069: 1066: 1061: 1057: 1053: 1039: 1038: 1024: 1019: 1015: 1011: 1007: 1003: 998: 994: 990: 985: 981: 977: 974: 969: 965: 961: 956: 952: 948: 945: 940: 936: 932: 910: 907: 864:energy density 812: 811: 809: 808: 801: 794: 786: 783: 782: 781: 780: 767: 750: 749: 746: 745: 738: 733: 728: 723: 718: 713: 708: 703: 698: 693: 688: 683: 678: 673: 668: 663: 658: 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569:Scientists 401:Formalisms 349:Formalisms 298:Black hole 224:World line 2268:Robertson 2253:Friedmann 2248:Eddington 2238:de Sitter 2072:Solutions 1950:detectors 1945:astronomy 1912:Phenomena 1847:Geodesics 1750:Spacetime 1693:Phenomena 1239:ρ 1193:∞ 1180:curvature 1158:⁡ 1150:− 1139:χ 1104:ϕ 1097:θ 1094:⁡ 1072:θ 1056:Ω 1014:Ω 1006:χ 1002:⁡ 980:χ 960:− 661:Robertson 626:Friedmann 621:Eddington 611:Nordström 601:de Sitter 458:Solutions 383:Geodesics 378:Friedmann 360:Equations 346:Equations 307:Spacetime 242:Phenomena 148:ν 145:μ 136:κ 127:ν 124:μ 116:Λ 108:ν 105:μ 43:talk page 2381:Category 2258:LemaĂźtre 2223:Einstein 2213:PoincarĂ© 2173:Others: 2157:Taub–NUT 2123:interior 2045:theories 2043:Advanced 2010:redshift 1825:concepts 1643:Rapidity 1621:concepts 1494:Archived 1449:61440784 1321:(1935). 903:flatness 878:of flat 777:Category 641:LemaĂźtre 606:Reissner 591:PoincarĂ© 576:Einstein 521:Taub–NUT 486:Wormhole 470:interior 183:Timeline 55:May 2018 36:disputed 2323:Hawking 2318:Penrose 2303:Novikov 2283:Wheeler 2228:Hilbert 2218:Lorentz 2175:pp-wave 1996:lensing 1792:General 1573:Special 1372:Bibcode 1178:is the 696:Hawking 691:Penrose 666:Bardeen 656:Wheeler 586:Hilbert 581:Lorentz 541:pp-wave 178:History 2364:others 2353:Thorne 2343:Misner 2328:Taylor 2313:Geroch 2308:Ehlers 2278:Zwicky 2096:Kasner 1522:  1470:  1447:  1437:  1405:  1331:  1113:  1041:where 1026:  844:was a 824:of an 775:  742:others 736:Thorne 726:Newman 706:Taylor 686:Ehlers 671:Walker 636:Zwicky 511:Kasner 2358:Weiss 2338:Bondi 2333:Hulse 2263:Milne 2167:discs 2111:Milne 2106:Gödel 1963:Virgo 1362:arXiv 1305:Notes 899:unity 852:model 711:Hulse 651:Gödel 631:Milne 526:Milne 491:Gödel 188:Tests 2293:Kerr 2243:Weyl 2142:Kerr 2002:and 1956:and 1954:LIGO 1520:ISBN 1468:ISBN 1445:OCLC 1435:ISBN 1403:ISBN 1329:ISBN 1146:sinh 993:sinh 840:The 721:Taub 676:Kerr 616:Weyl 496:Kerr 414:BSSN 2348:Yau 1973:GEO 1512:doi 1380:doi 1358:641 1085:sin 828:'s 731:Yau 409:ADM 2396:: 2022:/ 1988:: 1943:: 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Index

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General relativity
Spacetime curvature schematic
Introduction
History
Timeline
Tests
Mathematical formulation
Equivalence principle
Special relativity
World line
Pseudo-Riemannian manifold
Kepler problem
Gravitational lensing
Gravitational redshift
Gravitational time dilation
Gravitational waves
Frame-dragging
Geodetic effect
Event horizon
Singularity
Black hole
Spacetime
Spacetime diagrams
Minkowski spacetime
Einstein–Rosen bridge
Linearized gravity

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