Quasi-matter bounce and inflation in the light of the CSL model

León, Gabriel; Bengochea, Gabriel R.; Landau, Susana J.

doi:10.1140/epjc/s10052-016-4245-z

Cited by 17 publications

(20 citation statements)

References 67 publications

(201 reference statements)

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“…We found that, by including collapses, the results are different from the standard case, but also that, under certain particular conditions, similar results can be obtained. 5 For instance, in [8,10,25] it was shown that very particular CSL types of models, based on approach (i), could be consistent with both the CMB observations and constraints coming from non-relativistic laboratory situations. 6 Therefore, in a certain sense, even omitting the serious problems mentioned in (i), the results in [11] should be interpreted as merely "casting a shadow" on another particular type of CSL model, which is different from the ones considered in [8,10,25].…”

Section: Gravitation and Quantum Field Theorymentioning

confidence: 90%

Discussions about the landscape of possibilities for treatments of cosmic inflation involving continuous spontaneous localization models

et al. 2020

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In this work we consider a wide variety of alternatives opened when applying the continuous spontaneous localization (CSL) dynamical collapse theory to the inflationary era. The definitive resolution of many of the issues discussed here will have to await, not only for a general relativistic CSL theory, but for a fully workable theory of quantum gravity. Our concern here is to explore these issues, and to warn against premature conclusions. This exploration includes: two different approaches to deal with quantum field theory and gravitation, the identification of the collapse-generating operator and the general nature and values of the parameters of the CSL theory. All the choices connected with these issues have the potential to dramatically alter the conclusions one can draw. We also argue that the incompatibilities found in a recent paper, between the CSL parameter values and the cosmic microwave background observational data, are associated with specific choices made for the extrapolation to the cosmological context of the CSL theory (as it is known to work in non-relativistic laboratory situations) which do not represent the most natural ones.

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Section: Gravitation and Quantum Field Theorymentioning

confidence: 90%

Discussions about the landscape of possibilities for treatments of cosmic inflation involving continuous spontaneous localization models

et al. 2020

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“…With these modifications, theoretical predictions can be made, which then allow these theories to be tested and thus be able to say something about their viability to explain the precise observations, for example, of the CMB. Some predictions have proved very interesting since they have been able to explain certain observational constraints in a more natural and clear way than in the standard case (see for instance, [47][48][49][50][51][52][53][54][55][56][57]) 20 .…”

Section: Facing the Problem And Other Related Issuesmentioning

confidence: 99%

On the quantum description of the early universe

Bengochea

2020

Rev. Mex. Fis. E

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Why is it interesting to try to understand the origin of the universe? Everything we observe today, including our existence, arose from that event. Although we still do not have a theory that allows us to describe the origin itself, the study of the very early era of the universe involves the ideal terrain to analyze the interface between two of today’s most successful physical theories, General Relativity and Quantum physics. But it is also an area in which we have a large number of observational data to test our theoretical ideas. Two of the fathers of Quantum physics, Niels Bohr and Werner Heisenberg, shared some thoughts that could be described with these words: Quantum physics tells us that there is a line between the observed and the observer, and therefore science should be limited to what is observed. We must give up a complete, objective and realistic theory of the world. This article will orbit around these ideas and summarizes how it is that today, from recent works, we are in a position to try to challenge them (at least in part) through cosmology, seeking the quantum description of the early universe.

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“…The implementation of the CSL model into the picture of slow-roll inflation has been analyzed in previous work [42,[46][47][48] (in Refs. [43][44][45] the CSL model is also considered during inflation but based on a different conceptual approach).…”

Section: The Csl Model During Inflationmentioning

confidence: 99%

“…(16). Equation (47), also serves to illustrate the effect of the collapse. As long as λ H 1 the uncertainty of the field δ 2 Qφ will start to decrease with respect to the uncertainty in the vacuum state as expected from a reduction of the wave function.…”

Section: Modification Of the Standard Picturementioning

confidence: 99%

Eternal inflation and the quantum birth of cosmic structure

León

2017

Eur. Phys. J. C

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We consider the eternal inflation scenario of the slow-roll/chaotic type with the additional element of an objective collapse of the wave function. The incorporation of this new agent to the traditional inflationary setting might represent a possible solution to the quantum measurement problem during inflation, a subject that has not reached a consensus among the community. Specifically, it could provide an explanation for the generation of the primordial anisotropies and inhomogeneities, starting from a perfectly symmetric background and invoking symmetric dynamics. We adopt the continuous spontaneous localization model, in the context of inflation, as the dynamical reduction mechanism that generates the primordial inhomogeneities. Furthermore, when enforcing the objective reduction mechanism, the condition for eternal inflation can be bypassed. In particular, the collapse mechanism incites the wave function, corresponding to the inflaton, to localize itself around the zero mode of the field. Then the zero mode will evolve essentially unperturbed, driving inflation to an end in any region of the Universe where inflation occurred. Also, our approach achieves a primordial spectrum with an amplitude and shape consistent with the one that best fits the observational data.

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Quasi-matter bounce and inflation in the light of the CSL model

Cited by 17 publications

References 67 publications

Discussions about the landscape of possibilities for treatments of cosmic inflation involving continuous spontaneous localization models

Discussions about the landscape of possibilities for treatments of cosmic inflation involving continuous spontaneous localization models

On the quantum description of the early universe

Eternal inflation and the quantum birth of cosmic structure

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