Study on wormhole geometry with $$\rho (R, R^{'})$$ ρ(R,R′) matter in modified gravity

Nisha Godani (Department of Mathematics, Institute of Applied Sciences and Humanities, GLA University, Mathura, Uttar Pradesh, India) ; Smrutirekha Debata (Government Polytechnic, Goa, India) ; Shantanu Biswal (Department of Physics, Gandhi Institute for Technological Advancement, Bhubaneswar, India) ; Gauranga Samanta (Department of Mathematics, BITS Pilani K K Birla Goa Campus, Goa, India)

In this work, static traversable wormholes are investigated in $$R^2$$ R2 gravity with logarithmic trace term T, where R denotes the Ricci scalar, and $$T=-\rho +p_r+2p_t>0$$ T=-ρ+pr+2pt>0 , the trace of the energy momentum tensor. The connection between energy density of the matter component and the Ricci scalar is taken into account. Exact wormhole solutions are determined for three different novel forms of energy density: $$\rho =\alpha _1 R+\beta _1 R^{'}e^{\xi _1 R}$$ ρ=α1R+β1R′eξ1R , $$\rho =\alpha _2 R e^{\xi _2 R}$$ ρ=α2Reξ2R and $$\rho =\alpha _3 R^2+\beta _2 R^{'} e^{\xi _3 R^{'}}$$ ρ=α3R2+β2R′eξ3R′ , where prime denotes derivative with respect to r. The parameters $$\alpha _1$$ α1 , $$\beta _1$$ β1 , $$\xi _1$$ ξ1 , $$\alpha _2$$ α2 , $$\xi _2$$ ξ2 , $$\alpha _3$$ α3 , $$\xi _3$$ ξ3 and $$\beta _2$$ β2 play an important role for the absence of exotic matter inside the wormhole geometry. The parameter space is separated into numerous regions where the energy conditions are obeyed.

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      "value": "In this work, static traversable wormholes are investigated in $$R^2$$ <math><msup><mi>R</mi><mn>2</mn></msup></math>  gravity with logarithmic trace term T, where R denotes the Ricci scalar, and $$T=-\\rho +p_r+2p_t&gt;0$$ <math><mrow><mi>T</mi><mo>=</mo><mo>-</mo><mi>\u03c1</mi><mo>+</mo><msub><mi>p</mi><mi>r</mi></msub><mo>+</mo><mn>2</mn><msub><mi>p</mi><mi>t</mi></msub><mo>&gt;</mo><mn>0</mn></mrow></math> , the trace of the energy momentum tensor. The connection between energy density of the matter component and the Ricci scalar is taken into account. Exact wormhole solutions are determined for three different novel forms of energy density: $$\\rho =\\alpha _1 R+\\beta _1 R^{'}e^{\\xi _1 R}$$ <math><mrow><mi>\u03c1</mi><mo>=</mo><msub><mi>\u03b1</mi><mn>1</mn></msub><mi>R</mi><mo>+</mo><msub><mi>\u03b2</mi><mn>1</mn></msub><msup><mi>R</mi><msup><mrow></mrow><mo>\u2032</mo></msup></msup><msup><mi>e</mi><mrow><msub><mi>\u03be</mi><mn>1</mn></msub><mi>R</mi></mrow></msup></mrow></math> , $$\\rho =\\alpha _2 R e^{\\xi _2 R}$$ <math><mrow><mi>\u03c1</mi><mo>=</mo><msub><mi>\u03b1</mi><mn>2</mn></msub><mi>R</mi><msup><mi>e</mi><mrow><msub><mi>\u03be</mi><mn>2</mn></msub><mi>R</mi></mrow></msup></mrow></math>  and $$\\rho =\\alpha _3 R^2+\\beta _2 R^{'} e^{\\xi _3 R^{'}}$$ <math><mrow><mi>\u03c1</mi><mo>=</mo><msub><mi>\u03b1</mi><mn>3</mn></msub><msup><mi>R</mi><mn>2</mn></msup><mo>+</mo><msub><mi>\u03b2</mi><mn>2</mn></msub><msup><mi>R</mi><msup><mrow></mrow><mo>\u2032</mo></msup></msup><msup><mi>e</mi><mrow><msub><mi>\u03be</mi><mn>3</mn></msub><msup><mi>R</mi><msup><mrow></mrow><mo>\u2032</mo></msup></msup></mrow></msup></mrow></math> , where prime denotes derivative with respect to r. The parameters $$\\alpha _1$$ <math><msub><mi>\u03b1</mi><mn>1</mn></msub></math> , $$\\beta _1$$ <math><msub><mi>\u03b2</mi><mn>1</mn></msub></math> , $$\\xi _1$$ <math><msub><mi>\u03be</mi><mn>1</mn></msub></math> , $$\\alpha _2$$ <math><msub><mi>\u03b1</mi><mn>2</mn></msub></math> , $$\\xi _2$$ <math><msub><mi>\u03be</mi><mn>2</mn></msub></math> , $$\\alpha _3$$ <math><msub><mi>\u03b1</mi><mn>3</mn></msub></math> , $$\\xi _3$$ <math><msub><mi>\u03be</mi><mn>3</mn></msub></math>  and $$\\beta _2$$ <math><msub><mi>\u03b2</mi><mn>2</mn></msub></math>  play an important role for the absence of exotic matter inside the wormhole geometry. The parameter space is separated into numerous regions where the energy conditions are obeyed."
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Published on:
16 January 2020
Publisher:
Springer
Published in:
European Physical Journal C , Volume 80 (2020)
Issue 1
Pages 1-21
DOI:
https://doi.org/10.1140/epjc/s10052-019-7596-4
Copyrights:
The Author(s)
Licence:
CC-BY-4.0
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