Separating Dark Physics from Physical Darkness: Minimalist Modified Gravity vs. Dark Energy

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The acceleration of the cosmic expansion may be due to a new component of physical energy density or a modification of physics itself. Mapping the expansion of cosmic scales and the growth of large scale structure in tandem can provide insights to distinguish between the two origins. Using Minimal Modified Gravity (MMG) - a single parameter gravitational growth index formalism to parameterize modified gravity theories - we examine the constraints that cosmological data can place on the nature of the new physics. For next generation measurements combining weak lensing, supernovae distances, and the cosmic microwave background we can extend the ... continued below

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Huterer, Dragan & Linder, Eric V. January 31, 2007.

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The acceleration of the cosmic expansion may be due to a new component of physical energy density or a modification of physics itself. Mapping the expansion of cosmic scales and the growth of large scale structure in tandem can provide insights to distinguish between the two origins. Using Minimal Modified Gravity (MMG) - a single parameter gravitational growth index formalism to parameterize modified gravity theories - we examine the constraints that cosmological data can place on the nature of the new physics. For next generation measurements combining weak lensing, supernovae distances, and the cosmic microwave background we can extend the reach of physics to allow for fitting gravity simultaneously with the expansion equation of state, diluting the equation of state estimation by less than 25percent relative to when general relativity is assumed, and determining the growth index to 8percent. For weak lensing we examine the level of understanding needed of quasi- and nonlinear structure formation in modified gravity theories, and the trade off between stronger precision but greater susceptibility to bias as progressively more nonlinear information is used.

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  • Journal Name: Physical Review D; Related Information: Journal Publication Date: 19 January 2007

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  • Report No.: LBNL-61880
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevD.75.023519 | External Link
  • Office of Scientific & Technical Information Report Number: 962910
  • Archival Resource Key: ark:/67531/metadc928077

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 31, 2007

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:23 p.m.

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Huterer, Dragan & Linder, Eric V. Separating Dark Physics from Physical Darkness: Minimalist Modified Gravity vs. Dark Energy, article, January 31, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc928077/: accessed January 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.