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  1. No Access

    Article

    Reheating constraints on modified quadratic chaotic inflation

    The reheating era of inflationary universe can be parameterized by various parameters like reheating temperature \(T_{\text {re}}\) ...

    Sudhava Yadav, Rajesh Goswami, K. K. Venkataratnam… in The European Physical Journal Plus (2024)

  2. No Access

    Chapter and Conference Paper

    Relativistic Modelling for Anisotropic Stellar Object

    In this study, closed-form solutions for a spherically symmetric anisotropic matter distribution were obtained using the space-time geometry of Finch-Skea. We have shown that the class of solutions can be empl...

    Ankita Jangid, K. K. Venkataratnam in Advances in Mathematical Modelling, Applie… (2024)

  3. No Access

    Article

    Models of Anisotropic Stars in Spherically Symmetric Space-Time

    We introduce a new, well-mannered and stable model. To create the model, we used well-known Finch–Skea [1] ansatz for the metric potential ...

    Ankita Jangid, B. S. Ratanpal, K. K. Venkataratnam in Gravitation and Cosmology (2023)

  4. No Access

    Article

    Anisotropic Compact Star Model on Finch–Skea Space-Time

    We demonstrate a new anisotropic solution to the Einstein field equations in Finch–Skea space-time. The physical features of a stellar configuration have been studied in previous investigations. We create a mo...

    Ankita Jangid, B. S. Ratanpal, K. K. Venkataratnam in Gravitation and Cosmology (2023)

  5. No Access

    Article

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

    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 h...

    Meghna Rathore, Renu Dhayal, K. K. Venkataratnam in General Relativity and Gravitation (2022)

  6. Article

    Open Access

    Validity of semiclassical limit to quantum gravity in two-mode oscillating quantized massive scalar field quantum cosmology

    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 h...

    Meghna Rathore, Renu Dhayal, K. K. Venkataratnam in The European Physical Journal C (2022)

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  7. No Access

    Article

    Nonclassical nature of thermal quantum states in the oscillating FRW Universe

    We used coherent thermal and squeezed thermal vacuum states to represent the massive inflaton field in the semi-classical gravity; therefore, it would be useful to examine whether the field exhibits classical ...

    Renu Dhayal, Meghna Rathore, Rahul Singhal… in The European Physical Journal Plus (2021)

  8. No Access

    Article

    Density fluctuations and single-mode thermal states in the FRW universe

    Using single-mode squeezed and coherent thermal states formalism, we analyzed the validity of the semiclassical Einstein equation (SCEE) in the flat Friedmann–Robertson–Walker universe by analyzing the density...

    Renu Dhayal, Meghna Rathore, Vijay Kumar Kambila… in The European Physical Journal Plus (2020)

  9. No Access

    Article

    Single-Mode Squeezed Thermal States and Black Holes

    By using single-mode squeezed thermal states prescription, we study the particle production due to thermal black hole. We analyze that thermal squeezing for a black hole can also be a possible mechanism in ord...

    Renu Dhayal, Meghna Rathore… in International Journal of Theoretical Physi… (2019)

  10. No Access

    Article

    Investigations on the Thermal Stability of Fullerene-Based (Ag-C70) Nanocomposite Thin Films

    Fullerene-based bi-functional nanocomposite thin film (Ag nanoparticles embedded in fullerene C70 matrix) is synthesized by thermal co-deposition method. Thermal stability of Ag-C70 nanocomposite is investigated ...

    Rahul Singhal, R. Vishnoi, H. Inani, P. Sharma, K. K. Venkataratnam… in Plasmonics (2017)

  11. No Access

    Article

    Analytical Study of Two-Mode Thermal Squeezed States and Black Holes

    We study the two-mode thermal squeezed states formalism to examine the particle creation by black holes.We also study the entropy generation and derive an equation for Hawking temperature in terms of squeezed ...

    K. K. Venkataratnam in International Journal of Theoretical Physics (2017)

  12. No Access

    Article

    Preparation and characterization of PAN–KI complexed gel polymer electrolytes for solid-state battery applications

    The free standing and dimensionally stable gel polymer electrolyte films of polyacrylonitrile (PAN): potassium iodide (KI) of different compositions, using ethylene carbonate as a plasticizer and dimethyl form...

    N KRISHNA JYOTHI, K K VENKATARATNAM, P NARAYANA MURTY… in Bulletin of Materials Science (2016)