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$The Nature Versus Nurture of Anisotropies | With the rapidly growing number of cosmic microwave background measurements on various scales, there is real hope that the number of acceptable models for structure formation will be limited to a very few in the near future. Yet any given model can always be saved by introducing and tuning extraneous free parameters. To better understand this question of ``nature versus nurture'' for temperature fluctuations, it is useful to know not only the general features of anisotropy predictions but also their causes. Extracting the physical content of our other works, we present here a {\it simple} account of cosmic microwave background anisotropies on all scales. In particular, we show that analytic approximations can trace the structure of the so-called ``Doppler peaks,'' which arise due to the {\it adiabatic} oscillations in the photon-baryon fluid. We also show how the finite thickness of the last scattering surface and the Silk damping mechanism can be described in a unified way by photon diffusion. In order to present a specific example, we focus on comparing the primordial isocurvature baryon (PIB) model with the standard cold dark matter model (CDM). In particular, we explain why PIB generically predicts larger {\it non}-oscillatory anisotropies from the 1$^\circ$ to 10$^\circ$ scale which may already be in conflict with experiments.$

ui.adsabs.harvard.edu

1/1/1994

The Nature Versus Nurture of Anisotropies

With the rapidly growing number of cosmic microwave background measurements on various scales, there is real hope that the number of acceptable models for structure formation will be limited to a very few in the near future. Yet any given model can always be saved by introducing and tuning extraneous free parameters. To better understand this question of ``nature versus nurture'' for temperature fluctuations, it is useful to know not only the general features of anisotropy predictions but also their causes. Extracting the physical content of our other works, we present here a {\it simple} account of cosmic microwave background anisotropies on all scales. In particular, we show that analytic approximations can trace the structure of the so-called ``Doppler peaks,'' which arise due to the {\it adiabatic} oscillations in the photon-baryon fluid. We also show how the finite thickness of the last scattering surface and the Silk damping mechanism can be described in a unified way by photon diffusion. In order to present a specific example, we focus on comparing the primordial isocurvature baryon (PIB) model with the standard cold dark matter model (CDM). In particular, we explain why PIB generically predicts larger {\it non}-oscillatory anisotropies from the 1$^\circ$ to 10$^\circ$ scale which may already be in conflict with experiments.
commons.wikimedia.org

10/10/2023

User contributions for Weatherman2009 - Wikimedia Commons

02:0602:06, 7 February 2010 diff hist +3 m File:Pgbeads5.JPG 00:1700:17, 14 January 2010 diff hist −3 m File:IWANOYAMA-Kohun-Ichi.JPG 00:1500:15, 14 January 2010 diff hist −168 ...
en.wikipedia.org

7/4/1899

User:JPRiley/Adden - Wikipedia

From Wikipedia, the free encyclopedia Frank W. CrimpBornJuly 4, 1899LondonDiedJanuary 9, 1990 (aged 90)Milton, MassachusettsNationalityUnited StatesOccupationArchitect The Stoneham Town Hall, completed...
ko.wikipedia.org

더불어민주연합 - 위키백과, 우리 모두의 백과사전

더불어민주연합 더불어민주연합 로고 당직자 공동대표 윤영덕, 백승아 역사 창당 2024년 3월 3일[A] 해산 2024년 5월 8일 선행조직 더불어민주당, 진보당, 새진보연합 더불어민주연합(더불어民主聯合)은 제22대 국회의원 선거를 앞두고 더불어민주당과 진보당, 새진보연합이...