Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-10-09
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
PhD Thesis, Queen Mary, U. of London, Supervisor: Bernard J Carr. (134 pages and 9 figures)
Scientific paper
This thesis begins with a study of the origin of cosmological fluctuations with special attention to those cases in which the non-Gaussian correlation functions are large. The analysis shows that perturbations from an almost massless auxiliary field generically produce large values of the non-linear parameter f_NL. The effects of including non-Gaussian correlation functions in the statistics of cosmological structure are explored by constructing a non-Gaussian probability distribution function (PDF). Such PDF is derived for the comoving curvature perturbation from first principles in the context of quantum field theory, with n-point correlation functions as the only input. The non-Gaussian PDF is then used to explore two important problems in the physics of primordial black holes (PBHs): First, to compute non-Gaussian corrections to the number of PBHs generated from the primordial curvature fluctuations. The second application concerns new cosmological observables. The formation of PBHs is known to depend on two main physical characteristics: the strength of the gravitational field produced by the initial curvature inhomogeneity and the pressure gradient at the edge of the curvature configuration. We account for the probability of finding these configurations by using two parameters: The amplitude of the inhomogeneity and its second radial derivative, evaluated at the centre of the configuration. The implications of the derived probability for the fraction of mass in the universe in the form of PBHs are discussed.
No associations
LandOfFree
Primordial Black Holes in non-linear perturbation theory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Primordial Black Holes in non-linear perturbation theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Primordial Black Holes in non-linear perturbation theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-619429