tag:blogger.com,1999:blog-2846514233477399562.post2348951867883897498..comments2023-07-04T13:22:56.302+01:00Comments on RĂ‰SONAANCES: Non-Gaussian CMBJesterhttp://www.blogger.com/profile/08947218566941608850noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-2846514233477399562.post-24644523192540361592008-02-10T16:37:00.000+01:002008-02-10T16:37:00.000+01:00For an excellent review see astro-ph/0406398.For an excellent review see astro-ph/0406398.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-59211791115645690572008-02-08T18:10:00.000+01:002008-02-08T18:10:00.000+01:00There is no derivation really. Gaussianity follows...There is no derivation really. Gaussianity follows when the inflaton scalar field behaves as a free field in a curved background, so that its different Fourier frequencies oscillate independently. For a derivation of density perturbations from inflation see for example Lyth Riotto hep-ph/9807278.Jesterhttps://www.blogger.com/profile/16844247827820646813noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-927120107928306792008-02-03T18:58:00.000+01:002008-02-03T18:58:00.000+01:00Where can i find a formal mathematical derivation ...Where can i find a formal mathematical derivation of the Gaussianity of CMB?<BR/><BR/>many thanksAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-85222752538762683892008-01-21T10:28:00.000+01:002008-01-21T10:28:00.000+01:00Yes. I agree that curvaton is just a possible expl...Yes. I agree that curvaton is just a possible explanation. For example, Ekpyrotic scenario is an alternative model. ^-^<BR/><BR/>I also checked the paper by Y&W. They claimed that they found a large positive local(squezzed) type non-Gaussianity in the abstract.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-83973471009737210462008-01-20T19:57:00.000+01:002008-01-20T19:57:00.000+01:00I don't think much because i dont know much about ...I don't think much because i dont know much about CMB analyses. But, as far as i think, 1) Y&W don't claim the non-gaussianity is squeezed, they just didn't do their analyses for other types 2) At this stage it's far too early to discriminate between the models. Curvaton is a possible explanation, but just one of many.Jesterhttps://www.blogger.com/profile/16844247827820646813noreply@blogger.comtag:blogger.com,1999:blog-2846514233477399562.post-51201522677441513102008-01-20T06:25:00.000+01:002008-01-20T06:25:00.000+01:00It is very interesting. Yadav and Wandelt also str...It is very interesting. <BR/><BR/>Yadav and Wandelt also stressed that the shape of large non-Gaussianity is squeezed type which means k_1 is much smaller than k_2 and k_3. Curvaton scenario provides a possible explanation on it. I found that the author in 0801.0467 claimed that the inflation scale should be roughly at GUT scale in order to obtain such a large squeezed type non-Gaussianity in curvaton model. <BR/><BR/>What do you think about it?Anonymousnoreply@blogger.com