To the Revd R. P. Graves

Martineau, Harriet; Sanders, Valerie

doi:10.1093/oseo/instance.00162994

Cited by 12 publications

(24 citation statements)

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“…From now on we shall be ignoring such factors. Note that in the Schrödinger picture the time evolution of the wave function is determined by the correlator A(k, η); φ k is time independent and should not be confused with the Heisenberg picture mode ψ k (η) (13). The quantum mechanics of cosmological perturbations has been studied in [3,17].…”

Section: Quantum Mechanics Of Inflationary Perturbationsmentioning

confidence: 99%

“…Various arguments and calculations suggesting that a form of such environmental decoherence can indeed occur for inflationary perturbations have been put forward in [8,9,10,11,12,13,14,15,16]. In [9,10,11,12,13,14,16], the environment is taken to consist of the short wavelength modes which are coupled to the long wavelength modes via non-linear couplings. In this paper, we point out that the decoherence of cosmological perturbations can occur in a precisely defined dynamical setting if the role of the environment is played by unobservable isocurvature perturbations generated during multi-field inflation.…”

Section: Introductionmentioning

confidence: 99%

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Decoherence from isocurvature perturbations in inflation

Prokopec

Rigopoulos²

2007

J. Cosmol. Astropart. Phys.

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We discuss the possible role of isocurvature perturbations for the quantum decoherence of the curvature perturbation during inflation. We point out that if the inflaton trajectory in field space is curved, the adiabatic mode is generically coupled to the isocurvature mode and thus tracing out the latter can cause the curvature perturbation to decohere. We explicitly investigate this suggestion in a model of inflation with two decoupled massive fields and find that decoherence is effective for a wide range of mass ratios. In particular, we calculate the entanglement entropy for this model and show that it grows after horizon exit, providing a quantitative measure for decoherence.

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Section: Quantum Mechanics Of Inflationary Perturbationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decoherence from isocurvature perturbations in inflation

Prokopec

Rigopoulos²

2007

J. Cosmol. Astropart. Phys.

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“…A detection of significant primordial non-Gaussianity in the cosmic microwave background (CMB) could rule out simple slow- * wessel.valkenburg@lapp.in2p3.fr † krauss@asu.edu ‡ jan.hamann@lapp.in2p3.fr § Laboratoire de Physique Théorique d'Annecy-le-Vieux, UMR5108 ¶ current address roll inflation [17]. A second possibility is the fact that inflation generally produces a spectrum of tensor perturbations, which could, among other effects, produce an observable B-mode polarization in the CMB [18,19], albeit plagued by uncertainties [20,21]. Note that tensor perturbations are not the only source of B-mode polarization [22,23,24,25], and noninflationary transitions can also produce a similar background [26,27].…”

Section: Introductionmentioning

confidence: 99%

Impact of prior assumptions on Bayesian estimates of inflation parameters and the expected gravitational waves signal from inflation

2008

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There has been much recent discussion, and some confusion, regarding the use of existing observational data to estimate the likelihood that next-generation cosmic microwave background (CMB) polarization experiments might detect a nonzero tensor signal, possibly associated with inflation. We examine this issue in detail here in two different ways: (1) first we explore the effect of choice of different parameter priors on the estimation of the tensor-to-scalar ratio r and other parameters describing inflation, and (2) we examine the Bayesian complexity in order to determine how effectively existing data can constrain inflationary parameters. We demonstrate that existing data are not strong enough to render full inflationary parameter estimates in a parametrization-and priorindependent way and that the predicted tensor signal is particularly sensitive to different priors. For parametrizations where the Bayesian complexity is comparable to the number of free parameters we find that a flat prior on the scale of inflation (which is to be distinguished from a flat prior on the tensor-to-scalar ratio) leads us to infer a larger, and in fact slightly nonzero tensor contribution at 68% confidence level. However, no detection is claimed. Our results demonstratethat all that is statistically relevant at the current time is the (slightly enhanced) upper bound on r, and we stress that the data remain consistent with r = 0.

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“…Such rigorous censorship led to many British officers mistrusting French casualty returns, thinking them falsified. 101 Lieutenant Arthur Griffiths (63rd Regiment) witnessed the 'great scarcity in the French camp', but crucially noted that it was not 'mentioned in any contemporary memoirs'. 102 Overall, this affected the morale of the two armies; the press repeatedly informed the British army that it was a shambles in comparison with the French, while French morale was boosted owing to the praise it received in the British and French press.…”

Section: The French Experiencementioning

confidence: 99%

The French Army and British Army Crimean War Reforms

Dawson¹

2015

19: Interdisciplinary Studies in the Long Nineteenth Century

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To the Revd R. P. Graves

Cited by 12 publications

References 0 publications

Decoherence from isocurvature perturbations in inflation

Decoherence from isocurvature perturbations in inflation

Impact of prior assumptions on Bayesian estimates of inflation parameters and the expected gravitational waves signal from inflation

The French Army and British Army Crimean War Reforms

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