Pengantar relativitas umum: Perbedaan antara revisi

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[[Berkas:Cassini-science-br.jpg|ka|jmpl|341x341px|Uji presisi tinggi relativitas umum oleh roket luar angkasa [[Cassini–Huygens|Cassini]] (gambaran pelukis): sinyal radio yang dikirim antara Bumi dan probe (gelombang hijau) yang [[Shapiro effect|tertunda]] oleh kelengkungan dari [[Ruang waktu|ruang-waktu]] (garis biru) karena massa [[Matahari]].]]
{{General relativity sidebar}}
'''Relativitas umum''' adalah [[teori]] dari [[gravitasi]] yang dikembangkan oleh [[Albert Einstein]] antara tahun 1907 dan 1915. Menurut relativitas umum, efek gravitasi teramati antara beberapa massa merupakan hasil dari pembengkokan mereka dari [[Ruang waktu|ruang-waktu]].
 
Pada awal abad ke-20, [[Hukum gravitasi universal Newton|hukum-hukum Newton tentang gravitasi universal]] telah diterima selama lebih dari dua ratus tahun sebagai penjelasan valid dari gaya gravitasi antar massa. Dalam model Newton, gravitasi adalah hasil dari kekuatan tarik antara benda-benda besar. Meskipun bahkan Newton bermasalah dengan sifat alami gaya tersebut yang tidak diketahui, kerangka dasar ini sangat sukses dalam menggambarkan gerak.
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Percobaan dan pengamatan menunjukkan bahwa deskripsi Einstein mengenai gravitasi memperhitungan beberapa efek yang tidak dapat dijelaskan oleh hukum Newton, seperti anomali menit dalam [[orbit]] dari [[Merkurius]] dan [[Planet|planet-planet]] lainnya. Relativitas umum juga memprediksi efek novel gravitasi, seperti [[gelombang gravitasi]], [[lensa gravitasi]] dan efek gravitasi pada waktu yang dikenal sebagai [[dilatasi waktu gravitasi]]. Banyak dari prediksi ini telah dikonfirmasi oleh percobaan atau pengamatan, [[pengamatan gelombang gravitasi|yang paling baru adalah gelombang gravitasi]].
 
Relativitas umum telah berkembang menjadi alat penting dalam [[astrofisika]] modern. Teori ini memberikan dasar untuk pemahaman [[lubang hitam]], daerah ruang di mana efek gravitasi begitu kuat sehingga bahkan cahaya tidak dapat lolos. Gravitasi yang begitu kuat dianggap menjadi penyebab atas [[radiasi]] intensi yang dipancarkan oleh beberapa tipe [[objek astronomi]] (seperti [[inti galaksi aktif]] atau [[Microquasar|mikrokuasar]]). Relativitas umum juga merupakan bagian dari kerangka standar model kosmologi [[Ledakan Dahsyat]].
 
Meskipun relativitas umum bukan hanya teori relativistik satu-satunya, teori ini adalah teori paling sederhana yang konsisten dengan data eksperimen. Namun demikian, sejumlah pertanyaan tetap terbuka, yang paling mendasar adalah bagaimana relativitas umum dapat digabungkan dengan hukum [[Pengantar mekanika kuantum|fisika kuantum]] untuk menghasilkan teori [[gravitasi kuantum]] yang lengkap dan konsisten.
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Pada bulan September 1905, [[Albert Einstein]] menerbitkan teorinya mengenai [[relativitas khusus]], yang menggabungkan [[Hukum gerak Newton|hukum Newton tentang gerak]] dengan [[elektrodinamika]] (interaksi antara benda dengan [[muatan listrik]]). Relativitas khusus memperkenalkan kerangka kerja baru untuk ilmu fisika dengan mengusulkan konsep-konsep baru tentang [[ruang]] dan waktu. Beberapa teori fisika yang kemudian diterima inkonsisten dengan kerangka itu; contohnya adalah teori Newton tentang [[gravitasi]], yang menggambarkan saling tarik yang dialami oleh tubuh karena massa mereka.
 
Beberapa [[fisikawan]], termasuk Einstein, mencari sebuah teori yang dapat menggabungkan hukum gravitasi Newton dan relativitas khusus. Hanya teori Einstein terbukti konsisten dengan eksperimen dan pengamatan. Untuk memahami ide-ide dasar teori, maka mengikuti pikiran Einstein antara 1907 dan 1915, dari yang [[Percobaan pikiran|eksperimen pemikiran]] sederhana yang melibatkan pengamat jatuh bebas ke teori gravitasi geometriknya.<ref>This development is traced e.g. in [[Pengantar relativitas umum#CITEREFRenn2005|Renn 2005]]<span>, p. 110ff.</span>, in chapters 9 through 15 of [[Introduction to general relativity#CITEREFPais1982|Pais 1982]], and in [[Introduction to general relativity#CITEREFJanssen2005|Janssen 2005]]. </ref>
 
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Baris 88:
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[[Kategori:Gravitasi]]