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Nonclassicality of two-mode quantum optical states of an oscillating quantized massive scalar field in the FRW universe

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Abstract

Semiclassical Einstein equations are used to describe the interaction of the back-reaction of the classical gravitational field with quantum matter fields in semiclassical gravity. We in our previous studies have made use of the semiclassical approximation to demonstrate the phenomenon of particle production, commonly called as preheating/reheating of the universe, which occurs after the inflationary epoch during the oscillatory phase of two-mode quantised massive scalar field of the chaotic inflationary model. We have previously used the language of two-mode coherent and squeezed quantum optical states formalisms to represent the massive scalar field; therefore, it would be useful to examine whether the field states exhibits classical or nonclassical nature in the cosmological context. In the present article, we will examine the nonclassical nature of two-mode quantum optical states in the cosmological context. We have made use of the criterion suggested by Lee in quantum optics, for the existence of nonclassical effects in two-mode states and calculated the equivalent Lee’s \({{\mathcal {D}}}_{12}^{(2)}\) parameter with the associated cosmological parameters, to examine the nonclassical nature of the states after inflation during the oscillatory phase of the scalar field.

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The authors confirm that the data supporting the findings of this study are available within this research article.

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Authors and Affiliations

  1. Department of Physics, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India

    Meghna Rathore, Renu Dhayal & K. K. Venkataratnam

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  1. Meghna Rathore
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  2. Renu Dhayal
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  3. K. K. Venkataratnam
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Correspondence to K. K. Venkataratnam.

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Rathore, M., Dhayal, R. & Venkataratnam, K.K. Nonclassicality of two-mode quantum optical states of an oscillating quantized massive scalar field in the FRW universe. Gen Relativ Gravit 54, 57 (2022). https://doi.org/10.1007/s10714-022-02936-1

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