Does the small CMB quadrupole moment suggest new physics?
نویسندگان
چکیده
منابع مشابه
Does the small CMB quadrupole moment suggest new physics?
Motivated by WMAP’s confirmation of an anomalously low value of the quadrupole moment of the CMB temperature fluctuations, we investigate the effects on the CMB of cutting off the primordial power spectrum P (k) at low wave numbers. This could arise, for example, from a break in the inflaton potential, a prior period of matter or radiation domination, or an oscillating scalar field which couple...
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A widespread myth asserts that all small universe models suppress the CMB quadrupole. In actual fact, some models suppress the quadrupole while others elevate it, according to whether their low-order modes are weak or strong relative to their high-order modes. Elementary geometrical reasoning shows that a model’s largest dimension determines the rough value lmin at which the CMB power spectrum ...
متن کاملWhy CMB physics?
The aim of these lectures is to introduce some basic problems arising in gravitation and modern cosmology. All along the discussion the guiding theme is provided by the phenomenological and theoretical properties of the Cosmic Microwave Background (CMB). These lectures have been prepared for a regular Phd course of the University of Milan-Bicocca. e-mail address: [email protected]
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We address the question of the intrinsic quadrupole moment Q0 of the nucleon in various models. All models give a positive intrinsic quadrupole moment for the proton. This corresponds to a prolate deformation. We also calculate the intrinsic quadrupole moment of the ∆(1232). All our models lead to a negative intrinsic quadrupole moment of the ∆ corresponding to an oblate deformation. PACS numbe...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2003
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2003/09/010