Dark energy as a modification of the Friedmann equation

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Dark energy could actually be the manifestation of a modification to the Friendmann equation arising from new physics (e.g., extra dimensions). Writing the correction as (1 - {Omega}{sub M})H{sup {alpha}}/H{sub 0}{sup {alpha}-2}, they explore the phenomenology and detectability of such. They show that: (1) {alpha} must be {approx}< 1; (2) such a correction behaves like dark energy with equation-of-state w{sub eff} = -1 + {alpha}/2 in the recent past (10{sup 4} > z >> 1) and w = -1 in the distant future and can mimic w < -1 without violating the weak-energy condition; (3) w{sub eff} changes, dz/dw|{sub z ... continued below

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11 pages

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Dvali, Gia; U., /New York; Turner, Michael S. & /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Chicago U., EFI /Fermilab January 1, 2003.

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Dark energy could actually be the manifestation of a modification to the Friendmann equation arising from new physics (e.g., extra dimensions). Writing the correction as (1 - {Omega}{sub M})H{sup {alpha}}/H{sub 0}{sup {alpha}-2}, they explore the phenomenology and detectability of such. They show that: (1) {alpha} must be {approx}< 1; (2) such a correction behaves like dark energy with equation-of-state w{sub eff} = -1 + {alpha}/2 in the recent past (10{sup 4} > z >> 1) and w = -1 in the distant future and can mimic w < -1 without violating the weak-energy condition; (3) w{sub eff} changes, dz/dw|{sub z {approx} 0.5} {approx} {Omicron}(0.2), which is likely detectable; and (4) a future supernova experiment like SNAP that can determine w with precision {sigma}{sub w}, could determine {alpha} to precision {sigma}{sub {alpha}} {approx} 2{sigma}{sub w}.

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11 pages

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  • Report No.: FERMILAB-PUB-03-040-A
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 15011776
  • Archival Resource Key: ark:/67531/metadc1409385

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  • January 1, 2003

Added to The UNT Digital Library

  • Jan. 23, 2019, 12:54 p.m.

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  • Feb. 7, 2019, 3:07 p.m.

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Dvali, Gia; U., /New York; Turner, Michael S. & /Chicago U., Astron. Astrophys. Ctr. /KICP, Chicago /Chicago U., EFI /Fermilab. Dark energy as a modification of the Friedmann equation, article, January 1, 2003; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1409385/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.