Inkolelo-mbono ye-Big Bang kanye nemvelaphi yendawo yonke
Umbuzo wokuthi indawo yonke yavelaphi uye waheha abantu iminyaka eyizinkulungwane. Kusukela ezinganekwaneni zasendulo kuya ezifundweni zesayensi zanamuhla, ilukuluku mayelana "nesiqalo" alikaze linciphe. Ku-cosmology, incazelo eyamukelwa kabanzi namuhla yi-Big Bang Theory, umqondo wokuthi indawo yonke yaqala esimweni esishisayo kakhulu nesiminyene, yabe isinwetshwa yaba yi-cosmos esiyibuka namuhla. Nakuba igama elithi "bang" livame ukusetshenziswa, i-Big Bang kwakungeyona ukuqhuma endaweni engenalutho, kodwa kunalokho kwakuwukwanda kwendawo ngokwayo.
Iyini i-Big Bang Theory?
Ithiyori ye-Big Bang ithi indawo yonke yayisesimweni esibi kakhulu—amazinga okushisa aphezulu kakhulu kanye nobuningi—cishe eminyakeni eyizigidigidi eziyi-13,8 eyedlule. Kusukela kulezi zimo zokuqala, isikhathi sesikhala sanda; izinto kanye namandla kwabe sekuphola, kwakha izinhlayiya eziyisisekelo, ama-athomu, izinkanyezi, imithala, ngisho nezakhiwo ezinkulu ze-cosmic.
Kubalulekile ukuqonda: I-Big Bang ayiphenduli imibuzo ethi "kwenzekeni ngaphambili" noma "kungani kwakukhona okuthile kunokuba kungabikho lutho." Ichaza ngokuyinhloko ukuthi indawo yonke yavela kanjani kusukela esigabeni sayo sokuqala esishisayo nesinzima, ngokusekelwe ebufakazini bokubuka.
Ukuzalwa komqondo we-Big Bang: kusukela embonweni kuya ebufakazini
Isiqalo se-Big Bang yanamuhla sihlobene kakhulu nombono ka-Albert Einstein jikelele wokuhlobana (1915), ovumela indawo yonke eguquguqukayo (eyanda noma enciphayo). Ngawo-1920, isazi sezinkanyezi u-Edwin Hubble sathola ukuthi imithala ekude ibonakala sengathi iyasuka kithi—okwaboniswa ukushintsha okubomvu ku-spectrum yokukhanya. Lokhu kutholwa kwaholela esiphethweni esiyisisekelo: indawo yonke iyanda.
Uma indawo yonke ikhula namuhla, khona-ke uma "besingabuyisela emuva" isikhathi, indawo yonke ngabe iminyene futhi ishisa kakhulu esikhathini esidlule. Yilapho uhlaka lweBig Bang luthola khona indawo eqinile.
Izinsika ezintathu eziyinhloko zobufakazi be-Big Bang
Inkolelo-mbono ye-Big Bang yamukelwa kabanzi hhayi ngoba iyakhanga ngokwefilosofi, kodwa ngoba isekelwa ubufakazi obubalulekile bokubuka.
1. Ukwanda kwendawo yonke (uMthetho kaHubble)
UHubble wathola ubudlelwano phakathi kwebanga lomthala kanye nesivinini sawo sokuhlehla. Lapho umthala uqhelelene, kulapho ubomvu bawo buphakama khona. Lesi simo sichazwa kalula ngokwanda kwesikhala. Isifaniso esivamile yiso samachashazi ebhaluni elikhuphukile: esikhundleni samachashazi "ahamba" ebusweni, ubuso bebhaluni buyanwebeka, okwenza wonke amachashazi asuke komunye nomunye.
2. Imisebe Yangemuva Ye-Cosmic Microwave (CMB)
Ngo-1965, u-Arno Penzias noRobert Wilson bathola “umsindo” wama-microwave avela kuzo zonke izinhlangothi esibhakabhakeni. Lokhu kamuva kwaqondwa ukuthi yi-Cosmic Microwave Background (CMB)—insalela eshisayo yendawo yonke encane, lapho izinto nokukhanya “kwaqala ukuhlukanisa.”
I-CMB uhlobo "lwesithombe esincane" sendawo yonke: imisebe epholile kakhulu manje (cishe i-2,7 Kelvin) ngoba indawo yonke ikhule futhi ipholile eminyakeni eyizigidigidi. Ukuba khona kwe-CMB kungenye yezimpawu eziqine kakhulu zokuthi indawo yonke yayishisa futhi iminyene.
3. Ubuningi bezinto ezikhanyayo
Ithiyori ye-Big Bang ibikezela ukuthi emizuzwini yokuqala ngemva kokuqala, inqubo ye-nucleosynthesis yenzeka, yakha izinto zokukhanya ezifana ne-hydrogen, i-helium, kanye nenani elincane le-lithium. Ukuqashelwa kwezinkanyezi kubonisa ubuningi be-helium ne-deuterium okuhambisana nalesi sibikezelo. Lokhu kuqinisa umqondo wokuthi indawo yonke ngempela yabhekana nesigaba esishisayo esavumela ukusabela kwenuzi kwe-cosmic-scale.
Umugqa wesikhathi omfushane wendawo yonke ngokusho kweBig Bang
Ukuze baqonde imvelaphi yendawo yonke, izazi ze-cosmologists zakha indaba esekelwe ku-particle physics, i-relativity, kanye nedatha yokubuka. Nasi isifinyezo:
1. Isigaba sokuqala kakhulu: Indawo yonke yayisesimweni samandla aphezulu kakhulu. I-physics kulesi silinganiso isalokhu iyinselele ngoba idinga inkolelo-mbono engaphelele "yamandla adonsela phansi e-quantum."
2. Ukwehla kwamandla emvelo (i-hypothesis): Amamodeli amaningi asikisela ukuthi indawo yonke yanda ngokushesha okukhulu ngesikhathi esifushane kakhulu. Ukwehla kwamandla emvelo kusiza ukuchaza ukuthi kungani indawo yonke ibonakala ifana kangaka ezikalini ezinkulu nokuthi kungani i-geometry yesikhala ibonakala icishe ibe yisicaba.
3. Ukwakheka kwezinhlayiya eziyisisekelo: Njengoba kwanda, indawo yonke yaphola ukuze amandla aphenduke izinhlayiya, okuhlanganisa ama-quark, ama-electron, nama-neutrino.
4. I-Big Bang nucleosynthesis (cishe ngomzuzu wokuqala): Ama-proton nama-neutron ayahlangana ukuze akhe ama-nuclei akhanyayo.
5. Ukuhlanganiswa kabusha kanye nokuzalwa kwe-CMB (cishe iminyaka engu-380.000): Ama-electron ahlangana nama-nuclei ukuze akhe ama-athomu angathathi hlangothi, okwenza indawo yonke ibe sobala ekukhanyeni; imisebe ekhishwa ngaleso sikhathi yilokho esikubona manje njenge-CMB.
6. Izikhathi zobumnyama bendawo yonke: Ngaphambi kokuba izinkanyezi zokuqala zikhanye, indawo yonke yayinegesi engathathi hlangothi futhi kwakungekho mithombo yokukhanya ekhanyayo.
7. Izinkanyezi zokuqala nemithala (amakhulu ezigidi zeminyaka): Amandla adonsela phansi aqoqa izinto, abangele ukuzalwa kwezinkanyezi, bese kuba imithala.
8. Ukuvela kwezakhiwo ze-cosmic: Imithala yakha amaqoqo, imicu, kanye nezindonga ze-cosmic; izinkanyezi zakha izakhi ezisindayo ngokuhlangana kanye ne-supernovae.
9. Ukwakheka kwesimiso sonozungezilanga (cishe iminyaka eyizigidigidi ezingu-4,6): Izinto ezisindayo ezivela ezizukulwaneni zangaphambilini zezinkanyezi zakha amaplanethi, okuhlanganisa noMhlaba.
Izinto ezimnyama namandla amnyama: amaphazili amakhulu e-cosmology
Nakuba i-Big Bang ichaza okuningi, indawo yonke empeleni ayijwayelekile kunalokho esasikucabanga. Okubonwe kukhombisa ukuthi izinto ezivamile (ama-athomu) zakha cishe u-5% wokuqukethwe kwamandla okuphelele kwendawo yonke. Okunye kuqukethe:
– I-Dark matter: Ayikhiphi ukukhanya, kodwa imiphumela yayo yamandla adonsela phansi ibonakala ekujikelezeni kwemithala kanye nokwakheka kwezakhiwo ze-cosmic.
– Amandla amnyama: Ingxenye eyimfihlakalo ebonakala ibangela ukwanda kwendawo yonke ukuba isheshise.
Lezi zingxenye ezimbili azikwenzi kube nzima i-Big Bang; empeleni, ziyingxenye ebalulekile yemodeli yesimanje ye-cosmological (evame ukubizwa ngokuthi imodeli ye-ΛCDM). Kodwa-ke, uhlobo lwazo lwangempela luhlala lungomunye wemibuzo emikhulu ku-physics.
Ingabe i-Big Bang isho “isiqalo esiphelele”?
Igama elithi “imvelaphi” livame ukuqondwa njengendawo yokuqala eqondile. Kodwa ku-cosmology, umbuzo othi “kwenzekeni ngaphambi kwe-Big Bang” awulula kangako. Ngokujwayelekile ukuhlobana, uma silandela ukwanda emuva ngesikhathi, sisondela esimweni esibizwa ngokuthi “ubunye,” lapho ubuningi kanye nokugoba kwesikhala nesikhathi kuba okungenamkhawulo. Ososayensi abaningi babheka ubunye njengophawu lokuthi inkolelo-mbono yethu ayiphelele, hhayi ubufakazi bokuthi “isiqalo” kumelwe sibe iphuzu elingachazwanga.
Kusaphenywa imibono eminingana ehlukile noma ehambisanayo, isibonelo:
– Indawo yonke ejikelezayo (iyakhula futhi iyancipha ngokuphindaphindiwe),
– I-Big Bounce (ukugxumagxuma kusukela esigabeni sokufinyela sangaphambilini),
– I-Multiverse (indawo yonke yethu ingenye “yamabhamuza” amaningi e-cosmic).
Nokho, kubalulekile ukuqaphela: la mamodeli asadinga ukwesekwa kobufakazi bokubuka obuqinile njengezinsika zeBig Bang.
Kungani i-Big Bang Theory ibalulekile?
I-Big Bang Theory akuyona nje indaba yesikhathi esidlule. Inikeza uhlaka lokuqonda:
- kungani imithala isuka,
– izakhi zamakhemikhali zivelaphi,
- indlela izakhiwo ezinkulu ezakhiwa ngayo,
- nokuthi imithetho yefiziksi isebenza kanjani ezikalini ezinkulu kakhulu.
Ngakolunye uhlangothi, iBig Bang nayo yabonisa imikhawulo yolwazi lwabantu: ngemizuzwana yayo yokuqala, sabhekana nefiziksi eyeqisayo eyayifuna imibono emisha. I-cosmology yanamuhla iyindawo yokuhlangana kwesayensi yezinkanyezi, ifiziksi yezinhlayiya, izibalo, kanye nefilosofi yesayensi.
I-Penutup
Ithiyori ye-Big Bang iyincazelo yesayensi eqinile kakhulu yokuvela kwendawo yonke kusukela esigabeni sayo sokuqala esishisayo nesiminyene. Ubufakazi bokwanda kwendawo yonke, ukuba khona kwesizinda se-microwave sendawo yonke, kanye nobuningi bezinto zokukhanya kwakha isisekelo esiqinile esiqhubeka siqiniswa ngokubuka okuvela kuma-telescopes anamuhla. Kodwa-ke, kusele izimfihlakalo eziningi—kusukela emvelweni wezinto ezimnyama kanye namandla amnyama kuya emibuzweni mayelana nezimo zokuqala zesikhala-sikhathi.
Ekugcineni, ukutadisha imvelaphi yendawo yonke akugcini nje ngokwandisa ulwazi lwethu, kodwa futhi kushintsha indlela esibheka ngayo indawo yesintu endaweni yonke: njengengxenye encane yendawo yonke enkulu, umlando wayo esingawulandela ngokukhanya, idatha, kanye nemithetho yefiziksi.
