Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Huston, Ian"'
Autor:
Huston, Ian
Inflationary cosmology is the leading explanation of the very early universe. Many diff erent models of inflation have been constructed which fit current observational data. In this work theoretical and numerical methods for constraining the paramete
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516704
Autor:
Huston, Ian, Christopherson, Adam J.
Inflationary models involving more than one scalar field naturally produce isocurvature perturbations. However, while these are fairly well studied, less is known about their evolution through the reheating epoch, when the inflationary fields decay i
Externí odkaz:
http://arxiv.org/abs/1302.4298
How much does the curvature perturbation change after it leaves the horizon, and when should one evaluate the power spectrum? To answer these questions we study single field inflation models numerically, and compare the evolution of different curvatu
Externí odkaz:
http://arxiv.org/abs/1301.7613
Autor:
Huston, Ian, Christopherson, Adam J.
Non-adiabatic pressure perturbations naturally occur in models of inflation consisting of more than one scalar field. The amount of non-adiabatic pressure present at the end of inflation can have observational consequences through changes in the curv
Externí odkaz:
http://arxiv.org/abs/1211.6976
Publikováno v:
JCAP 1209 (2012) 001
We calculate the conditions required to produce a large local trispectrum during two-field slow-roll inflation. This is done by extending and simplifying the 'heatmap' approach developed by Byrnes et al. The conditions required to generate a large tr
Externí odkaz:
http://arxiv.org/abs/1203.6844
Publikováno v:
Class. Quantum Grav. 30 (2013) 065008
How much does the curvature perturbation change after it leaves the horizon, and when should one evaluate the power spectrum? To answer these questions we study single field inflation models numerically, and compare the evolution of different curvatu
Externí odkaz:
http://arxiv.org/abs/1111.6940
Autor:
Huston, Ian, Christopherson, Adam J.
Publikováno v:
Phys. Rev. D 85, 063507 (2012)
Isocurvature perturbations naturally occur in models of inflation consisting of more than one scalar field. In this paper we calculate the spectrum of isocurvature perturbations generated at the end of inflation for three different inflationary model
Externí odkaz:
http://arxiv.org/abs/1111.6919
Autor:
Huston, Ian, Malik, Karim A.
Publikováno v:
JCAP10(2011)029
We numerically calculate the evolution of second order cosmological perturbations for an inflationary scalar field without resorting to the slow-roll approximation or assuming large scales. In contrast to previous approaches we therefore use the full
Externí odkaz:
http://arxiv.org/abs/1103.0912
Autor:
Alabidi, Laila, Huston, Ian
Publikováno v:
JCAP 1008:037,2010
In this paper we summarise the status of single field models of inflation in light of the WMAP 7 data release. We find little has changed since the 5 year release, and results are consistent with previous findings. The increase in the upper bound on
Externí odkaz:
http://arxiv.org/abs/1004.4794
Autor:
Huston, Ian, Malik, Karim A.
Publikováno v:
JCAP0909:019,2009
We numerically solve the Klein-Gordon equation at second order in cosmological perturbation theory in closed form for a single scalar field, describing the method employed in detail. We use the slow-roll version of the second order source term and ar
Externí odkaz:
http://arxiv.org/abs/0907.2917