Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/20657
COMPARTIR / EXPORTAR:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Título

Sachs-Wolfe at second order: the CMB bispectrum on large angular scales

AutorBoubekeur, Lotfi; Creminelli, P.; D'Amico, G.; Norena, J.; Vernizzi, F.
Palabras claveCMBR theory
non-gaussianity
Cosmological perturbation theory
Fecha de publicación25-ago-2009
EditorInstitute of Physics Publishing
CitaciónJournal of Cosmology and Astroparticle Physics 8 (029) (2009)
ResumenWe calculate the Cosmic Microwave Background anisotropy bispectrum on large angular scales in the absence of primordial non-Gaussianities, assuming exact matter dominance and extending at second order the classic Sachs-Wolfe result delta T/T = Phi/3. The calculation is done in Poisson gauge. Besides intrinsic contributions calculated at last scattering, one must consider integrated effects. These are associated to lensing, and to the time dependence of the potentials (Rees-Sciama) and of the vector and tensor components of the metric generated at second order. The bispectrum is explicitly computed in the flat-sky approximation. It scales as l(-4) in the scale invariant limit and the shape dependence of its various contributions is represented in 3d plots. Although all the contributions to the bispectrum are parametrically of the same order, the full bispectrum is dominated by lensing. In the squeezed limit it corresponds to f(NL)(local) = -1/6 - cos(2 theta), where theta is the angle between the short and the long modes; the angle dependent contribution comes from lensing. In the equilateral limit it corresponds to f(NL)(equil) similar or equal to 3.13.
Versión del editorhttp://dx.doi.org/10.1088/1475-7516/2009/08/029
URIhttp://hdl.handle.net/10261/20657
DOI10.1088/1475-7516/2009/08/029
ISSN1475-7516
Aparece en las colecciones: (IFIC) Artículos

Ficheros en este ítem:
Fichero Descripción Tamaño Formato
Sach.Wolfe.pdf1,13 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo

CORE Recommender

SCOPUSTM   
Citations

50
checked on 08-mar-2024

WEB OF SCIENCETM
Citations

55
checked on 21-feb-2024

Page view(s)

326
checked on 29-mar-2024

Download(s)

322
checked on 29-mar-2024

Google ScholarTM

Check

Altmetric

Altmetric


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.