Inkolelo-mbono ye-Big Bang kanye nemvelaphi yendawo yonke
Umbuzo wokuthi indawo yonke yaqala kanjani uye waheha abantu iminyaka eyizinkulungwane. Kusukela ezinganekwaneni zokudala zamasiko ahlukahlukene kuya ocwaningweni lwesayensi lwanamuhla, ilukuluku ngemvelaphi yendawo yonke alikaze linciphe. Kwisayensi yanamuhla, inkolelo-mbono eyamukelwa kabanzi yokuchaza ukuzalwa nokuvela kwendawo yonke yi-Big Bang Theory. Le nkolelo-mbono akuyona nje "ukuqhuma" okuvamile, kodwa imodeli yesayensi esekelwa ubufakazi obuningi bokubuka, bezibalo, kanye nobe-cosmological. Lesi sihloko sixoxa ngokuthi iyini i-Big Bang Theory, ukuthi ubufakazi buyisekela kanjani, izigaba zokuqala zendawo yonke, kanye nemibuzo emikhulu ehlala ivulekile.
Iyini i-Big Bang Theory?
Ithiyori yeBig Bang ithi indawo yonke yaqala esimweni esishisayo nesiminyene cishe eminyakeni eyizigidigidi eziyi-13,8 eyedlule, futhi kusukela ngaleso sikhathi, indawo yonke iye yanda futhi yaphola. Igama elithi "Big Bang" livame ukuholela embonweni oyiphutha wokuthi ukuqhuma kwenzeke endaweni ethile emkhathini. Kodwa-ke, ngokusho kwe-cosmology yanamuhla, isikhala ngokwaso siyanda. Lokhu kusho ukuthi akukho "sikhungo" sokuqhuma ngaphakathi emkhathini; esikhundleni salokho, yonke indawo iyanda.
Imodeli yeBig Bang inikeza uhlaka lokuchaza ukuthi kungani imithala ihlukana, ukuthi kungani indawo yonke igcwele imisebe esele kusukela ezinsukwini zayo zokuqala, nokuthi kungani izinto zokukhanya ezifana ne-hydrogen ne-helium ziningi kangaka. Kodwa-ke, le mbono akuyona impendulo eqondile. IBig Bang ichaza ukuvela kwendawo yonke kusukela ezimweni zayo zokuqala ezimbi kakhulu, kodwa umbuzo othi "kwenzekeni ngaphambi kwalokho" usalokhu uyinkinga yempikiswano nocwaningo olusebenzayo.
Umlando Omfushane: Kusukela Ekuhlobaneni Kuya Esayensini Yezinto Zanamuhla
Umqondo wokuthi indawo yonke iyanda usekelwe ekuthuthukisweni kuka-Albert Einstein kwe-General Theory of Relativity (1915). Izibalo zika-Einstein zivumela indawo yonke eguquguqukayo—engakhula noma inciphe. Ekuqaleni, u-Einstein wayecabanga ukuthi indawo yonke ayiguquki, ngakho wanezela "i-cosmological constant" ukuze alinganise imodeli yakhe. Kodwa-ke, okubonwe kamuva kwabonisa ukuthi indawo yonke ayiguquki.
Ngawo-1920, isazi sezinkanyezi u-Edwin Hubble sathola ukuthi ukukhanya okuvela emithaleni ekude kuyashintshwa bomvu, okubonisa ukuthi kuyahamba. Ubudlelwano phakathi kwebanga noshintshwa bomvu, okwaziwa ngokuthi uMthetho kaHubble, sebube yinsika eyinhloko ye-cosmology. Lokhu kwaholela ekuqondeni ukuthi uma indawo yonke isanda manje, yayiminyene esikhathini esidlule—kuze kube semsukeni we-cosmic.
Ubufakazi Obuthathu Obuyinhloko Benkolelo-mbono Ye-Big Bang
Ithiyori ye-Big Bang yamukelwa kabanzi ngoba isekelwa yimigqa eminingana eqinile yobufakazi bokubuka. Ezintathu zazo zivame ukubhekwa njengezisekelo eziyinhloko.
1. Ukwanda Kwendawo Yonke (Ukushintsha Okubomvu Kwegalaksi)
Njengoba imithala ihamba, amaza okukhanya esiwatholayo ayanwebeka, ashintshela ekugcineni okubomvu kwe-spectrum. Lapho umthala uqhelelene, kulapho ubomvu bawo bushintsha khona kakhulu. Lokhu kuhambisana nendawo yonke ekhulayo. Lokhu kwanda akukhona nje ukunyakaza kwemithala emkhathini, kodwa kunalokho ukwandiswa kwesikhala phakathi kwayo.
2. Imisebe Yangemuva Ye-Cosmic Microwave (CMB)
Ngo-1965, u-Arno Penzias noRobert Wilson bathola i-Cosmic Microwave Background (CMB), "ukubuyela emuva" kwemisebe evela endaweni yonke encane. I-CMB iyinsalela eshisayo evela esikhathini lapho indawo yonke yayipholile ngokwanele ukuba ama-athomu angathathi hlangothi akheke, okuvumela ukukhanya ukuthi kuhambe ngokukhululeka. Namuhla, i-CMB itholakala njengemisebe ye-microwave enezinga lokushisa elingaba ngu-2,7 Kelvin. Iphethini yezinguquko ezincane (i-anisotropies) ku-CMB iphinde inikeze izinkomba zembewu yezakhiwo ezazizokhula kamuva zibe imithala kanye namaqoqo emithala.
3. Ubuningi Bezinto Ezikhanyayo
Ithiyori ye-Big Bang ibikezela ukuthi emizuzwini embalwa yokuqala ye-Big Bang, kwenzeka i-nucleosynthesis, yakha izinto zokukhanya: ikakhulukazi i-hydrogen, i-helium, kanye nenani elincane le-lithium. Ukubonwa kokwakheka kwezinto eziyisisekelo zendawo yonke kuvumelana kahle nalesi sibikezelo. Uma indawo yonke ingakaze ibe sesigabeni esishisayo nesiminyene, kunzima ukuchaza ubuningi obukhulu be-helium yokuqala.
Ukulandelana Kwezikhathi Kwendawo Yonke Yasekuqaleni
Ukuze baqonde imvelaphi yendawo yonke ngokwe-Big Bang, ososayensi bakhe uhlelo lokulandelana kwezigaba zokuqala olusekelwe kwi-physics enamandla aphezulu.
1. Isikhathi Sokuqala Kakhulu kanye Nokwehla Kwentengo
Isikhathi esincane kakhulu ngemva kokuqala kwayo, kukholelwa ukuthi indawo yonke idlule ekukhuphukeni kwe-cosmic—isikhathi sokwanda okusheshayo kakhulu. Ukwehla kwe-inflation kuchaza ukuthi kungani indawo yonke ibonakala ifana kakhulu ezikalini ezinkulu nokuthi kungani i-geometry yesikhala ibonakala icishe ifane. Nakuba ukwehla kwe-inflation kungakaqondakali ngokugcwele, idatha eminingi ye-CMB isekela umbono wokuthi kungenzeka ukuthi kwenzeke into efana nokwehla kwe-inflation.
2. Ukwakheka Kwezinhlayiya Eziyisisekelo
Njengoba indawo yonke yayanda, izinga lokushisa layo lehla. Amandla ayenele ngaphambili ukukhiqiza izinhlayiya ezahlukene “aqina” kancane kancane abe yizinhlayiya ezizinzile esizaziyo: ama-quark, ama-leptoni, bese kuba ama-proton nama-neutron. Phakathi nalesi sigaba, i-antimatter nayo yakhiwa, kodwa ngesizathu esithile indawo yonke yethu isalokhu ibuswa yizinto. Le nkinga ibizwa ngokuthi i-matter–antimatter asymmetry, enye yezimfihlakalo ezinkulu ze-cosmology.
3. I-Big Bang Nucleosynthesis
Kungakapheli nemizuzu embalwa kusukela ekuqaleni, ama-proton nama-neutron ahlangana ukuze akhe i-athomu nuclei elula njenge-helium-4. Ngemva kwalokho, indawo yonke yaba pholile kakhulu ukuba i-fusion enkulu iqhubeke. Yingakho izakhi ezisindayo njenge-carbon, i-oxygen, ne-iron zingakhiwanga ku-Big Bang, kodwa zakhiwa kamuva kakhulu ezinkanyezini nasekuqhumeni kwe-supernova.
4. Ukuhlanganiswa kanye nokukhishwa kokukhanya (CMB)
Eminyakeni engaba ngu-380.000 ngemva kokuqala, amazinga okushisa ehla ngokwanele ukuba ama-electron ahlangane nama-nuclei ukuze akhe ama-athomu angathathi hlangothi. Lapho ama-electron engasashayisani nama-photon njalo, ukukhanya kwakungahamba ngokukhululeka. Lokhu kukhanya yilokho esikubona manje njenge-CMB.
5. Izinkathi Zobumnyama, Izinkanyezi Zokuqala, kanye Nezinkanyezi Zomkhathi
Ngemva kokuhlanganiswa kabusha, indawo yonke yangena enkathini yobumnyama, kungekho zinkanyezi ezikhanyayo. Ngemuva kwalokho, amandla adonsela phansi aqoqa igesi ezinkanyezini zokuqala, ezavuselela indawo yonke futhi zasiza ekwakheni izakhiwo ezinkulu: imithala, amaqoqo emithala, kanye newebhu yendawo yonke.
Indima Yezinto Ezimnyama Namandla Amnyama
I-Big Bang yanamuhla yayingeyona nje into evamile. Okubonwe kukhombisa ukuthi into esingayibona—izinkanyezi, igesi, amaplanethi—iyingxenyana encane nje yokuqukethwe okuphelele kwendawo yonke.
– I-Dark matter iyisakhi esingabonakali esisebenzisana kakhulu ngamandla adonsela phansi. Kusiza ukuchaza ukuthi kungani imithala ikwazi ukujikeleza ngesivinini esikhulu ngaphandle kokuqhekeka, nokuthi izakhiwo ezinkulu zakha kanjani ngokushesha kunokuba bekukhona into evamile yodwa.
– Amandla amnyama yigama lento ebangela ukuthi indawo yonke ikhule ngokushesha, etholakale ngokubuka ama-supernova ngasekupheleni kweminyaka yama-1990. Amandla amnyama ahlala engenye yezimfihlakalo ezinkulu zefiziksi ngoba uhlobo lwawo oluqondile alukaziwa.
Imibono Engalungile Evamile Nge-Big Bang
Kuneziphutha eziningana ezivame ukuvela:
1. I-Big Bang kwakungekona ukuqhuma endaweni engenalutho, kodwa kwakuwukwanda kwendawo ngokwayo.
2. Ithiyori ye-Big Bang ayiyona into ephambene nefilosofi "yokudalwa," kodwa kunalokho iyimodeli yesayensi echaza ukuvela kwendalo yonke ngokusekelwe ekubonweni kanye nemithetho yefiziksi.
3. I-Big Bang ayiphenduli ngokuzenzakalelayo ukuthi “kungani kukhona okuthile kunokuba kungabikho lutho.” I-Cosmology ichaza “indlela” indawo yonke eyavela ngayo; umbuzo wokuthi “kungani” ungabandakanya indawo yefilosofi noma yemfundiso yenkolo.
Imibuzo Ehlala Ivulekile
Nakuba inamandla, i-Big Bang Theory ishiya imibuzo eminingana eyisisekelo:
- Yini ebangela ukukhuphuka kwamanani, futhi iyiphi indlela eqondile esetshenziswayo?
– Kungani kukhona okungaphezu kwezinto ezingokoqobo?
– Iyini imvelo yezinto ezimnyama kanye namandla amnyama?
– Kwenzekani “endaweni yokuqala” uma sethula amandla adonsela phansi e-quantum?
– Ingabe indawo yonke yethu iyodwa kuphela, noma ingxenye yezinto eziningi?
Ososayensi abaningi bakholelwa ukuthi ukuze siphendule le mibuzo, sidinga inkolelo-mbono ehlanganisa ukuhlangana okujwayelekile kanye ne-quantum mechanics, evame ukubizwa ngokuthi i-quantum gravity. Abafaki zicelo bafaka i-string theory kanye ne-loop quantum gravity approaches, kodwa akekho kubo oye waqinisekiswa ngokubuka.
I-Penutup
Ithiyori ye-Big Bang iyingqophamlando enkulu ekufuneni kwabantu ukuqonda indawo yonke. Njengoba kunobufakazi bokwanda kwendawo yonke, imisebe yangemuva ye-microwave yendawo yonke, kanye nobuningi bezinto zokukhanya, lo modeli unikeza indaba yesayensi ehambisanayo mayelana nohambo lwendawo yonke kusukela ezimweni zokuqala ezimbi kakhulu kuya endaweni yonke egcwele imithala, izinkanyezi, namaplanethi. Kodwa-ke, i-Big Bang ayisona isiphetho sendaba. Eqinisweni, ngemuva kwempumelelo yayo, kuye kwavela izimfihlakalo ezintsha eziphonsela inselelo i-physics yesimanje: udaba olumnyama, amandla amnyama, ukukhuphuka kwamandla, kanye nemibuzo mayelana nezimo zokuqala zendawo yonke. Ukufuna izimpendulo zalezi zimfihlakalo yikho okugcina i-cosmology iphila, ishintshashintsha, futhi ishintsha njalo.
Uma ufisa, ngingaguqula lesi sihloko sibe yindlela ethandwa kakhulu ngabafundi, noma ngibe nobuchwepheshe obuningi ngamafomula engeziwe, izibalo, kanye nezinkomba zokufunda.
