Zobrazeno 1 - 10
of 326
pro vyhledávání: '"Lyth, David"'
Publikováno v:
Phys. Rev. D 95, 103503 (2017)
A new model of thermal inflation is introduced, in which the mass of the thermal waterfall field is dependent on a light spectator scalar field. Using the $\delta N$ formalism, the "end of inflation" scenario is investigated in order to ascertain whe
Externí odkaz:
http://arxiv.org/abs/1702.08855
Autor:
Lyth, David H.
The CMB anisotropy at $\ell\lsim 60$ seems to have some special features which include (i) a dipole modulation and (ii) a decrease in power. It is known that both of these effects can be generated if a curvaton-type field has a super-horizon perturba
Externí odkaz:
http://arxiv.org/abs/1405.3562
Autor:
Lyth, David H.
The tensor fraction $r\simeq 0.16$ found by BICEP2 corresponds to a Hubble parameter $H\simeq 1.0\times 10^{14}\GeV$ during inflation. This has two implications for the (single-field) slow-roll inflation hypothesis. First, the inflaton perturbation m
Externí odkaz:
http://arxiv.org/abs/1403.7323
Autor:
Lyth, David H.
Erickcek, Kamionkowski and Carroll proposed in 2008 that the dipole modulation of the CMB could be due to a very large scale perturbation of the field $\phi$ causing the primordial curvature perturbation. We repeat their calculation using weaker assu
Externí odkaz:
http://arxiv.org/abs/1304.1270
Autor:
Lyth, David H., Karčiauskas, Mindaugas
The inflaton might be coupled to a gauge field through a term f^2(\phi) F_\mu\nu F^\mu\nu. If f \propto a^{-2} where a(t) is the scale factor, the perturbation \delta W of the gauge field generates a potentially observable statistically anisotropic c
Externí odkaz:
http://arxiv.org/abs/1302.7304
Autor:
Lyth, David H., Karciauskas, Mindaugas
We present the first complete calculation of the curvature perturbation generated during the hybrid inflation waterfall, caused by the coupling of the waterfall field to a gauge field A whose kinetic function f^2 depends on the inflaton field. We imp
Externí odkaz:
http://arxiv.org/abs/1209.4266
Autor:
Lyth, David H., Karciauskas, Mindaugas
If the waterfall field of hybrid inflation couples to a U(1) gauge field, the waterfall can generate a statistically anisotropic contribution to the curvature perturbation. We investigate this possibility, generalising in several directions the semin
Externí odkaz:
http://arxiv.org/abs/1204.6619
Autor:
Lyth, David H.
Without demanding a specific form for the inflaton potential, we obtain an estimate of the contribution to the curvature perturbation generated during the linear era of the hybrid inflation waterfall. The spectrum of this contribution peaks at some w
Externí odkaz:
http://arxiv.org/abs/1201.4312