Cosmological Particle Creation and Dynamical Casimir Effect

Setare, M. R.

doi:10.1023/b:ijtp.0000049022.58541.34

Cited by 12 publications

(11 citation statements)

References 29 publications

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“…III, the spacetime was supposed to play the role of a thermal reservoir such that together the mode pairs constitute a closed system as spacetime is expanding. This situation is similar to the second law of phenomenological non-equilibrium thermodynamics [47] and therefore can be modeled with Equation (40). We note that this model provides interesting insight into the notion of the entropy production.…”

Section: Entropy Productionmentioning

confidence: 62%

“…We notice that the form of scale factor Equation (7) is a generalisation of some particular cosmological models, found in literature [39][40][41]. With particular choices of parameters a, b and c we get some well-known models such as radiation dominated universe, which is a case with a = b = 0, c = gives rise to the model discussed in [41].…”

Section: Interpretation Of Resultsmentioning

confidence: 77%

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Entropy Production in the Expanding Universe

Farahmand

Mohammadzadeh

2017

The 4th International Electronic Conference on Entropy and Its Applications

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Abstract:The spacetime is basically curved and dynamical. Thus our knowledge of universe must be extended to a dynamical curved spacetime to understand the nature of the universe. The field theory in the curved spacetime has shown that the evolution of spacetime involving the field in the curved spacetime leads to particle creation. From another perspective, by employing thermodynamics to cosmology, we can learn about the source of current entropy content associated with the universe. From the quantum thermodynamics, it is clear that the inner friction stemming from the quantum fluctuations of the field can produce the entropy. Using this approach, the particle creation due to the expansion of spacetime beginning from the vacuum is shown as an entropic increase. Considering an asymptotically flat Robertson-Walker spacetime, the particle creation entropy is evaluated. Each special scale factor can be used to characterize the cosmic parameters. Thus, the dependence of particle creation entropy on the field parameters and the cosmic parameters allows us to recover information from the underlying structure of the spacetime. Also, by adding an entropy production, indicating the mutual information between created particle and spacetime, to this particle creation entropy, the well-known entanglement measure can obtained to investigate the entanglement of created particles. In fact, the entanglement entropy, measuring the mixedness of the primary state, is affected from the creation and the correlation of the particle.

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Section: Entropy Productionmentioning

confidence: 62%

Section: Interpretation Of Resultsmentioning

confidence: 77%

Entropy Production in the Expanding Universe

Farahmand

Mohammadzadeh

2017

The 4th International Electronic Conference on Entropy and Its Applications

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“…The essential difference between our calculations and that presented in [1] is that this author does not take into account the degeneracy factor (l + 1)…”

Section: Discussionmentioning

confidence: 86%

“…The particle creation in a 1 + 1 spatially closed Robertson-Walker space-time was investigated in [2,5]. The 3 + 1 version of this problem has been investigated in a recent work [1] [9]. However, when generalizing the 1+1 solution to the 3+1 one, this author missed a degeneracy factor leading to an incomplete answer for the total number of particles created as well as the corresponding total energy.…”

Section: Introductionmentioning

confidence: 99%

Particle Creation in a Robertson–Walker Universe Revisited

Pascoal

Farina

2007

Int J Theor Phys

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“…In a 1 + 1 spatially closed Robertson-Walker spacetime, this subject was investigated by N.D. Birell and P.C. Davis [5], while the particle creation for a massive scalar field conformally coupled to a spatially closed Robertson-Walker spacetime was discussed in [6], and revisited recently in [7]. Some authors have shown that the amount of particle production in an arbitrary cosmological background can be determined using only the latetime positive frequency modes alone [8].…”

Section: Introductionmentioning

confidence: 99%

Hawking-de Sitter Thermalization of Quasi-Minkowskian Massless Scalaron Production, Energy Density Content and Back-Reaction

Pîrghie

Dariescu

2009

Int J Theor Phys

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Projecting the closed form expression of the de Sitter scalar field operator onto the Minkowskian positive frequency massless modes, we compute the corresponding Bogolubov coefficient which is associated to the (massless) quasiparticle creation during the stationary quasi-de Sitter stage of the Universe. Thereafter, we derive the expression of the thermalized energy density which reveals an interesting mixture of de Sitter false vacuum and dark-radiation, exotic dust and black body radiation. Setting the temperature to the value of the Hawking one for the de Sitter spacetime, we finally analyze the (straightforward) back-reaction of the newly created "matter" on the scale function. It basically points out three stages of highly continuous evolution represented by an initially short radiationlike era, a somewhat long-lasting connecting phase made of coherent massless oscillations, in its beginnings, ended up by the dark-radiation (i.e. curvature-like term) contribution and, finally, a much slower exponential expansion than the initial de Sitter one.

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Cosmological Particle Creation and Dynamical Casimir Effect

Cited by 12 publications

References 29 publications

Entropy Production in the Expanding Universe

Entropy Production in the Expanding Universe

Particle Creation in a Robertson–Walker Universe Revisited

Hawking-de Sitter Thermalization of Quasi-Minkowskian Massless Scalaron Production, Energy Density Content and Back-Reaction

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