Primordial gravitational waves and the collapse of the wave function

León, Gabriel; Kraiselburd, Lucila; Landau, Susana J.

doi:10.1103/physrevd.92.083516

Cited by 17 publications

(21 citation statements)

References 47 publications

(91 reference statements)

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“…[51] one followed a different approach to the problem; the authors successfully applied the CSL collapse mechanism to the inflationary universe but within the semiclassical gravity framework. Consequently, as pointed out in [30,52], the amplitude of the primordial gravitational waves is exactly zero at first order in the perturbations. Therefore, a confirmed detection of primordial gravity waves would make this approach face serious issues.…”

Section: Introductionmentioning

confidence: 91%

Emergence of inflationary perturbations in the CSL model

León

Bengochea

2016

Eur. Phys. J. C

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The inflationary paradigm is the most successful model that explains the observed spectrum of primordial perturbations. However, the precise emergence of such inhomogeneities and the quantum-to-classical transition of the perturbations has not yet reached a consensus among the community. The continuous spontaneous localization model (CSL), in the cosmological context, might be used to provide a solution to the mentioned issues by considering a dynamical reduction of the wave function. The CSL model has been applied to the inflationary universe before and different conclusions have been obtained. In this letter, we use a different approach to implement the CSL model during inflation. In particular, in addition to accounting for the quantum-toclassical transition, we use the CSL model to generate the primordial perturbations, that is, the dynamical evolution provided by the CSL model is responsible for the transition from a homogeneous and isotropic initial state to a final one lacking such symmetries. Our approach leads to results that can be clearly distinguished from preceding works. Specifically, the scalar and tensor power spectra are not time-dependent, and one retains the amplification mechanism of the CSL model. Moreover, our framework depends only on one parameter (the CSL parameter) and its value is consistent with cosmological and laboratory observations.

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Section: Introductionmentioning

confidence: 91%

Emergence of inflationary perturbations in the CSL model

León

Bengochea

2016

Eur. Phys. J. C

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“…In the particular case of CSL theory, its first implementation into the primordial universe, based on the SCG framework, was done in [228], and some of us have continued to explore its consequences. For example, in [239,241,242] it was shown that a strong suppression of primordial B-modes in the CMB is predicted generically. In addition, within that same framework, observational constraints were analyzed in [238], and in [232] it was found that the condition for eternal inflation can be bypassed.…”

Section: Introductionmentioning

confidence: 99%

Emergent universe revisited through the CSL theory

2021

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In this work we analyze how the spectrum of primordial scalar perturbations is modified, within the emergent universe scenario, when a particular version of the Continuous Spontaneous Localization (CSL) model is incorporated as the generating mechanism of initial perturbations, providing also an explanation to the quantum-to-classical transition of such perturbations. On the other hand, a phase of super-inflation, prior to slow-roll inflation, is a characteristic feature of the emergent universe hypothesis. In recent works, it was shown that the super-inflation phase could generically induce a suppression of the temperature anisotropies of the CMB at large angular scales. We study here under what conditions the CSL maintains or modifies these characteristics of the emergent universe and their compatibility with the CMB observations.

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“…Moreover, in [32][33][34], and working in the context of semiclassical gravity, it was shown that the CSLIM predicts a strong suppression of primordial B-modes, i.e. the predicted amplitude of the tensor power spectrum is very small generically (undetectable by current experiments).…”

Section: Introductionmentioning

confidence: 99%

Generation of inflationary perturbations in the continuous spontaneous localization model: The second order power spectrum

León

Piccirilli

2020

Phys. Rev. D

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Cosmic inflation, which describes an accelerated expansion of the early Universe, yields the most successful predictions regarding temperature anisotropies in the cosmic microwave background (CMB). Nevertheless, the precise origin of the primordial perturbations and their quantum-toclassical transition is still an open issue. The continuous spontaneous localization model (CSL), in the cosmological context, might be used to provide a solution to the mentioned puzzles by considering an objective reduction of the inflaton wave function. In this work, we calculate the primordial power spectrum at the next leading order in the Hubble flow functions that results from applying the CSL model to slow roll inflation within the semiclassical gravity framework. We employ the method known as uniform approximation along with a second order expansion in the Hubble flow functions. We analyze some features in the CMB temperature and primordial power spectra that could help to distinguish between the standard prediction and our approach.

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Primordial gravitational waves and the collapse of the wave function

Cited by 17 publications

References 47 publications

Emergence of inflationary perturbations in the CSL model

Emergence of inflationary perturbations in the CSL model

Emergent universe revisited through the CSL theory

Generation of inflationary perturbations in the continuous spontaneous localization model: The second order power spectrum

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