Tenaga gelap

Dalam kosmologi fizikal dan astronomi, tenaga gelap ialah satu bentuk hipotesis bagi tenaga yang menelap segala ruang dan cenderung untuk memecutkan pengembangan alam semesta. Tenaga gelap ialah hipotesis paling diterima untuk menjelaskan penceparan sejak 1990-an yang menandakan bahawa alam semesta sedang mengembang pada kadar memecut. Menurut pasukan misi Planck, dan berdasarkan model piawai kosmologi, pada dasar kesetaraan jisim–tenaga, alam semesta boleh cerap mengandungi 26.8% jirim gelap, 68.3% tenaga gelap (untuk sejumlah 95.1%) dan 4.9% jirim biasa.Sean Carroll, Ph.D., Cal Tech, 2007, The Teaching Company, Dark Matter, Dark Energy: The Dark Side of the Universe, Guidebook Part 2 halaman 46, dicapai pada 7 Oktober 2013, "...dark energy: A smooth, persistent component of invisible energy, thought to make up about 70 percent of the current energy density of the universe. Dark energy is known to be smooth because it doesn't accumulate preferentially in galaxies and clusters..." Sekali lagi pada dasar kesetaraan jisim–tenaga, ketumpatan tenaga gelap (1.67 × 10−27 kg/m3) adalah sangat rendah: dalam sistem suria, hanya 6 tan tenaga gelap dianggarkan dijumpai dalam jejeari orbit Pluto. Walau bagaimanapun, tenaga gelap datang untuk mendominasi jisim–tenaga bagi alam semesta kerana tenaga gelap adalah seragaman di serata angkasa lepas.http://hyperphysics.phy-astr.gsu.edu/hbase/astro/dareng.html

Lihat juga

 Graviti sama bentuk
 Keadaan hampagas
 Kerelatifan De Sitter
 Projek Illustris
 The Dark Energy Survey

Rujukan

Pautan luar

 Dark energy: how the paradigm shifted Physicsworld.com 

 "Mysterious force's long presence" BBC News online (2006) More evidence for dark energy being the cosmological constant 
 "Astronomy Picture of the Day" one of the images of the Cosmic Microwave Background which confirmed the presence of dark energy and dark matter 
 SuperNova Legacy Survey home page The Canada-France-Hawaii Telescope Legacy Survey Supernova Program aims primarily at measuring the equation of state of Dark Energy. It is designed to precisely measure several hundred high-redshift supernovae. 
 "Report of the Dark Energy Task Force" 
 "HubbleSite.org – Dark Energy Website" Multimedia presentation explores the science of dark energy and Hubble's role in its discovery. 
 "Surveying the dark side" 
 "Dark energy and 3-manifold topology" Acta Physica Polonica 38 (2007), p. 3633–3639 
 The Dark Energy Survey 
 The Joint Dark Energy Mission  
 Harvard: Dark Energy Found Stifling Growth in Universe, primary source
 April 2010 Smithsonian Magazine Article 
 HETDEX Dark energy experiment 
 Dark Energy FAQ 
 "The Hunt for Dark Energy" George FR Ellis, Peter Cameron and David Tong discuss the presence of dark energy in the universe 

Kategori:Tenaga (Fizik)
Kategori:Fizik kosmologi
Kategori:Masalah tidak selesai dalam astronomi
Kategori:Masalah tidak selesai dalam fizik