Општа теорија релативности — разлика између измена

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м Бот: исправљена преусмерења; козметичке измене
.
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[[File:Black Hole Milkyway.jpg|thumb|260px|Симулисана [[црна рупа]] са 10 [[Сунчева маса|соларних маса]] унутар [[Млечни пут|Млечног пута]], гледана са растојања од 600 километера.]]
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'''Општа теорија релативности''' дело је [[Алберт Ајнштајн|Алберта Ајнштајна]]. Она у односу на његову [[Специјална теорија релативности|Специјалну теорију релативности]] представља ново уопштење или генерализацију принципа релативности са [[инерција]]лних и на све друге системе референције укључујући у то и неинерцијалне или убрзане системе, као и оне који мирују у [[гравитационо поље|гравитационом пољу]].


'''Општа релативност''' или '''општа теорија релативности''' (ОТР) је [[Диференцијална геометрија|геометријска]] [[Теоријска физика|теорија]] [[гравитација|гравитације]] коју је [[Алберт Ајнштајн]] објавио у чланку ''Основе опште теорије релативности'' ({{jez-nem|Die Grundlage der allgemeinen Relativitätstheorie}}), 1915. године у -{''[[Annalen der Physik]]''}-.<ref>-{Albert Einstein: ''Die Grundlage der allgemeinen Relativitätstheorie''. U: ''Annalen der Physik''. 49, 1916., S.&nbsp;769–822 ([http://www.physik.uni-augsburg.de/annalen/history/papers/1916_49_769-822.pdf Faksimil], PDF)}-</ref><ref>-{O'Connor, J.J. and E.F. Robertson (1996), "[http://www-history.mcs.st-and.ac.uk/HistTopics/General_relativity.html General relativity]". ''[http://www-history.mcs.st-and.ac.uk/Indexes/Math_Physics.html Mathematical Physics index]'', [http://www.st-andrews.ac.uk/maths/ School of Mathematics and Statistics], [http://www.st-andrews.ac.uk/ University of St. Andrews], Scotland, May, 1996. Retrieved 2015-02-04.}-</ref> Теорија представља релативистичко поопштење [[специјална релативност|специјалне релативности]] и [[Исак Њутн|Њутнове]] теорије [[гравитација|гравитације]]. Она пружа уједињени опис гравитације као геометријског својства [[простор]]а и [[Време у физици|времена]], или [[простор-време]]на. Специфично, [[закривљеност]] простор-времена је директно повезана са [[енергија|енергијом]] и [[момент]]ом независно од тога која [[материја]] и [[радијација]] су присутне. Однос је специфициран у [[Ајнштајнова једначине поља|Ајнштајновим једначинама поља]], систему [[парцијална диференцијална једначина|парцијалних диференцијалних једначина]].
Стварајући своју Општу теорију релативности Ајнштајн уводи нове претпоставке или постулате као што су једнакост инерцијалне и гравитационе масе или еквивалентност инерцијалних и гравитационих сила (Ајнштајнов [[принцип еквивалентности]]).


Нека од предвиђања опште релативности се знатно разликују од класично физичких ставова, посебно у погледу протока времена, геометрије простора, кретања тела при [[слободни пад|слободном паду]], и простирања светлости. Примери тих разлика обухватају [[Гравитациона дилација времена|гравитациону дилацију времена]], [[Гравитационо сочиво|гравитатиона сочива]], [[гравитациони црвени помак]] светлости, и [[Шапиров ефекат|гравитационо временско кашњење]]. Предвиђања теорије опште релативности су до сад била [[тестови опште релативности|потврђена]] у свим опажањима и експериментима. Мада општа релативност није једина [[Алтернативе општој релативности|релативистичка теорија гравитације]], она је [[Окамова бритва|најједноставнија теорија]] која је конзистентна са експерименталним подацима. Међутим, питања без одговора остају, најфундаменталније од којих је усаглашавање опште релативности са законима [[квантна механика|квантне физике]] којим би се произвела комплетна и усаглашена теорија [[квантна гравитација|квантне гравитације]].
Такође, за разлику од Специјалне теорије релативности у којој су простор и време повезани али су независни од масе (материје) у општој релативности Ајнштајн успоставља нову међузавистност простор-времена са једне и материје са друге стране. На тај начин долази до свога, оригиналног, објашњења деловања гравитационе силе; материја (маса) деформише или, како се обично каже, закривљује простор тако да друга тела у овоме простору морају да закривљују своје путање или да се праволинијски убрзавају, што је у ствари једнако деловању [[гравитација|гравитационе силе]].


Ајнштајнова теорија има важне астрофизичке импликације. На пример, из ње проистиче могућност постојања [[црна рупа|црних рупа]] — просторних региона у којима су простор и време закривљени на такав начин да ништа, чак ни светлост, не може да побегне — као крајњег стадијума масивних [[звезда]]. Постоји обиље доказа да је интензивна [[радијација]] коју емитују поједине врсте астрономских објеката узрокована црним рупама; на пример, [[микроквазар]]и и [[ацтиве галацтиц нуцлеус|активна галактика језгра]] су резултат присуства [[Звездана црна рупа|звезданих црних рупа]] и црних рупа [[Супермасивна црна рупа|далеко масивнијег типа]], респективно. Савијање светлосит дејством гравитације може да доведе до феномена [[Гравитационо сочиво|гравитационог сочива]], услед којег су вишеструке слике истог удаљеног астрономског објекта видљиве на небу. Општа релативност такође предвиђа постојање [[Гравитациони талас|гравитационих таласа]], који су индиректно уочени; директна мерења су циљ пројеката као што су [[ЛИГО]] ({{jez-eng|Laser Interferometer Gravitational-Wave Observatory}}) и НАСА/ЕСА ({{jez-eng|Laser Interferometer Space Antenna}}) и разних [[Низови за пулсарске временске прорачуне|низова за пулсарске временске прорачуне]]. Поред тога, општа релативност је основа данашњих [[Физичка космологија|космолошких]] модела конзистентно [[Ширење свемира|експандирајућег свемира]].
Међу главне потврде ове Ајнштајнове теорије убрајају се појава савијања путање светлости у близини масивних небеских тела као и померање [[перихел]]а [[Меркур]]ове [[орбита|орбите]] које раније није могло да буде објашњено на основу [[Класична механика|класичне]], [[Исак Њутн|Њутнове]], механике. Такође су битни и постулати.

== Постулати и структура теорије ==
[[Датотека:Spacetime curvature.png|thumb|300px|Дводимензионална аналогија закривљености просторвремена]]
За разлику од класичног, њутновог описа гравитације као силе која се јавља међу масивним телима на позадини апсолутног простор-времена, у ОТР улогу гравитације узима само простор-време. Њега сада описујемо помоћу метричког тензора (<math>g_{\mu \nu}</math>) који је решење [[Albert Ајнштајн|Ајнштајнове]] једначине

<math>R_{\mu \nu} - \frac{1}{2} \, R \, g_{\mu \nu} = \frac{8\pi G}{c^{2}} \, T_{\mu \nu}</math>

где је <math>R_{\mu \nu}</math> Ричијев тензор, <math>R</math> Ричијев скалар, а <math>T_{\mu \nu}</math> тензор енергије-импулса. Константе у једначнии су <math>c</math>, брзина светлости и <math>G</math>, гравитацијска константа. Утицај гравитације на честице дефинисан је закривљеношћу простор-времена (тј. његовом геометријом) коју дефинишу [[маса|масе]] и сва физичка [[Поље (физика)|поља]] (осим гравитационог).

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{{refend}}


== Спољашње везе ==
== Спољашње везе ==
Ред 12: Ред 3.114:
* [http://publicliterature.org/books/relativity/xaa.php ''Релативност: специјална и општа теорија''] ([http://publicliterature.org/pdf/relat10.pdf ПДФ])
* [http://publicliterature.org/books/relativity/xaa.php ''Релативност: специјална и општа теорија''] ([http://publicliterature.org/pdf/relat10.pdf ПДФ])
* [http://www.einstein-online.info Ајнштајн онлајн] – Чланци о разним аспектима релативистичке физике за опште читалаштво; хостује [[Макс Планк институт за гравитациону физику]]
* [http://www.einstein-online.info Ајнштајн онлајн] – Чланци о разним аспектима релативистичке физике за опште читалаштво; хостује [[Макс Планк институт за гравитациону физику]]
* [http://archive.ncsa.illinois.edu/Cyberia/NumRel/NumRelHome.html NCSA Spacetime Wrinkles] – produced by the numerical relativity group at the National Center for Supercomputing Applications, with an elementary introduction to general relativity
* {{YouTube |id=hbmf0bB38h0&list=EC6C8BDEEBA6BDC78D |title=Einstein's General Theory of Relativity}} (lecture by Leonard Susskind recorded September 22, 2008 at Stanford University).
* [http://www.luth.obspm.fr/IHP06/ Series of lectures on General Relativity] given in 2006 at the Institut Henri Poincaré (introductory/advanced).
* [http://www.math.ucr.edu/home/baez/gr/ General Relativity Tutorials] by John Baez.
* {{cite web |author=Brown, Kevin |title=Reflections on relativity |work=Mathpages.com |url=http://www.mathpages.com/rr/rrtoc.htm |accessdate= 29. 5. 2005}}
* {{cite web |author=Carroll, Sean M. |title=Lecture Notes on General Relativity |url=http://arxiv.org/abs/gr-qc/9712019 |accessdate= 5. 1. 2014}}
* {{cite web |author=Moor, Rafi |title=Understanding General Relativity |url=http://www.rafimoor.com/english/GRE.htm |accessdate= 11. 7. 2006}}
* {{cite web |author=Waner, Stefan |title=Introduction to Differential Geometry and General Relativity |url=http://www.zweigmedia.com/diff_geom/tc.html |accessdate=2015-04-05 |format=PDF}}


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[[Категорија:Релативност]]
[[Категорија:Релативност]]

Верзија на датум 12. март 2017. у 18:26

Симулисана црна рупа са 10 соларних маса унутар Млечног пута, гледана са растојања од 600 километера.

Општа релативност или општа теорија релативности (ОТР) је геометријска теорија гравитације коју је Алберт Ајнштајн објавио у чланку Основе опште теорије релативности (нем. Die Grundlage der allgemeinen Relativitätstheorie), 1915. године у Annalen der Physik.[1][2] Теорија представља релативистичко поопштење специјалне релативности и Њутнове теорије гравитације. Она пружа уједињени опис гравитације као геометријског својства простора и времена, или простор-времена. Специфично, закривљеност простор-времена је директно повезана са енергијом и моментом независно од тога која материја и радијација су присутне. Однос је специфициран у Ајнштајновим једначинама поља, систему парцијалних диференцијалних једначина.

Нека од предвиђања опште релативности се знатно разликују од класично физичких ставова, посебно у погледу протока времена, геометрије простора, кретања тела при слободном паду, и простирања светлости. Примери тих разлика обухватају гравитациону дилацију времена, гравитатиона сочива, гравитациони црвени помак светлости, и гравитационо временско кашњење. Предвиђања теорије опште релативности су до сад била потврђена у свим опажањима и експериментима. Мада општа релативност није једина релативистичка теорија гравитације, она је најједноставнија теорија која је конзистентна са експерименталним подацима. Међутим, питања без одговора остају, најфундаменталније од којих је усаглашавање опште релативности са законима квантне физике којим би се произвела комплетна и усаглашена теорија квантне гравитације.

Ајнштајнова теорија има важне астрофизичке импликације. На пример, из ње проистиче могућност постојања црних рупа — просторних региона у којима су простор и време закривљени на такав начин да ништа, чак ни светлост, не може да побегне — као крајњег стадијума масивних звезда. Постоји обиље доказа да је интензивна радијација коју емитују поједине врсте астрономских објеката узрокована црним рупама; на пример, микроквазари и активна галактика језгра су резултат присуства звезданих црних рупа и црних рупа далеко масивнијег типа, респективно. Савијање светлосит дејством гравитације може да доведе до феномена гравитационог сочива, услед којег су вишеструке слике истог удаљеног астрономског објекта видљиве на небу. Општа релативност такође предвиђа постојање гравитационих таласа, који су индиректно уочени; директна мерења су циљ пројеката као што су ЛИГО (енгл. Laser Interferometer Gravitational-Wave Observatory) и НАСА/ЕСА (енгл. Laser Interferometer Space Antenna) и разних низова за пулсарске временске прорачуне. Поред тога, општа релативност је основа данашњих космолошких модела конзистентно експандирајућег свемира.

Постулати и структура теорије

Дводимензионална аналогија закривљености просторвремена

За разлику од класичног, њутновог описа гравитације као силе која се јавља међу масивним телима на позадини апсолутног простор-времена, у ОТР улогу гравитације узима само простор-време. Њега сада описујемо помоћу метричког тензора () који је решење Ајнштајнове једначине

где је Ричијев тензор, Ричијев скалар, а тензор енергије-импулса. Константе у једначнии су , брзина светлости и , гравитацијска константа. Утицај гравитације на честице дефинисан је закривљеношћу простор-времена (тј. његовом геометријом) коју дефинишу масе и сва физичка поља (осим гравитационог).

Референце

  1. ^ Albert Einstein: Die Grundlage der allgemeinen Relativitätstheorie. U: Annalen der Physik. 49, 1916., S. 769–822 (Faksimil, PDF)
  2. ^ O'Connor, J.J. and E.F. Robertson (1996), "General relativity". Mathematical Physics index, School of Mathematics and Statistics, University of St. Andrews, Scotland, May, 1996. Retrieved 2015-02-04.

Литература

Beginning undergraduate textbooks

Спољашње везе