Currently, I am working as an Assistant Professor (Permanent) at the Department of Mathematics, Ramjas College, University of Delhi, Delhi, India. I have completed a contractual Assistant Professor (adiunkt- research academics) position at the Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, Poland. I completed PhD in Mathematics from the School of Basic Sciences (School of Mathematical & Statistical Sciences), Indian Institute of Technology Mandi, Himachal Pradesh, India. I received my M.Sc. in Applied Mathematics from Gautam Buddha University, Uttar Pradesh, India.
RESEARCH, TEACHING, or OTHER INTERESTS
Applied Mathematics, Modeling and Simulation, Ecological Modeling, Biochemistry
Stability and Bifurcation Analysis of Fractional-Order Delayed Prey-Predator System and the Effect of Diffusion Vikas Kumar, Nitu Kumari International Journal of Bifurcation and Chaos, 2022 Most biological systems have long-range temporal memory. Such systems can be modeled using fractional-order differential equations. The combination of fractional-order derivative and time delay provides the system more consistency with the reality of the interactions and higher degree of freedom. A fractional-order delayed prey–predator system with the fear effect has been proposed in this work. The time delay is considered in the cost of fear; therefore, there are no dynamical changes observed in the system due to time delay in the absence of fear. The existence and uniqueness of the solutions of the proposed system are studied along with non-negativity and boundedness. The existence of biologically relevant equilibria is discussed, and the conditions for local asymptotic stability are derived. Hopf bifurcation occurs in the system with respect to delay parameter. Further, a spatially extended system is proposed and analyzed. Hopf bifurcation also occurs in the extended system due to the delay parameter. Numerical examples are provided in support of analytical findings. Fractional-order derivative improves the stability and damps the oscillatory behaviors of the solutions of the system. Bistability behavior of the system admits stable dynamics by decreasing the fractional-order. Also, chaotic behavior is destroyed by decreasing fractional-order.
A study of chaos and its possible control in an eco-epidemiological model with alternative food source in predator and weak allee effect in prey species Nonlinear Studies, 2021
Exploring the Impact of Time Delay with Fractional Derivative and Diffusion in a Three-Species Food Chain Model V Kumar, N Kumari Iranian Journal of Science, 1-20 , 2025 2025 Citations: 1
Prey-taxis and time delay induced instabilities in a prey–predator system incorporating the smith growth function V Kumar International Journal of Biomathematics, 2550066 , 2025 2025 Citations: 1
Pattern formation and delay-induced instability in a Leslie–Gower type prey–predator system with Smith growth function V Kumar Mathematics and Computers in Simulation 225, 78-97 , 2024 2024 Citations: 13
Spatiotemporal dynamics and Turing patterns in an eco-epidemiological model with cannibalism V Kumar, N Kumari, RP Agarwal Results in Control and Optimization 9, 100183 , 2022 2022 Citations: 16
Impact of nanoparticles on the dynamics of a Crowley–Martin type phytoplankton–zooplankton interaction model V Kumar, B Pramanick Results in Control and Optimization 8, 100139 , 2022 2022 Citations: 5
Modeling wind effect and herd behavior in a predator–prey system with spatiotemporal dynamics D Barman, V Kumar, J Roy, S Alam The European Physical Journal Plus 137 (8), 950 , 2022 2022 Citations: 38
Refugia and Allee effect in prey species stabilize chaos in a tri-trophic food chain model B Nath, N Kumari, V Kumar, KP Das Differential Equations and Dynamical Systems 30 (3), 631-657 , 2022 2022 Citations: 59
Pattern formation study of Hassell-Varley prey-predator system with fear effect V Kumar, N Kumari AIP Conference Proceedings 2435 (1), 020053 , 2022 2022 Citations: 8
Controlling chaos and pattern formation study in a tritrophic food chain model with cannibalistic intermediate predator N Kumari, V Kumar The European Physical Journal Plus 137 (3), 1-23 , 2022 2022 Citations: 26
Stability and Bifurcation Analysis of Fractional-Order Delayed Prey–Predator System and the Effect of Diffusion V Kumar, N Kumari International Journal of Bifurcation and Chaos 32 (01), 2250002 , 2022 2022 Citations: 12
Bifurcation study and pattern formation analysis of a tritrophic food chain model with group defense and Ivlev-like nonmonotonic functional response V Kumar, N Kumari Chaos, Solitons & Fractals 147, 110964 , 2021 2021 Citations: 43
Stability and bifurcation analysis of Hassell–Varley prey–predator system with fear effect V Kumar, N Kumari International Journal of Applied and Computational Mathematics 6 (5), 150 , 2020 2020 Citations: 33
A study of chaos and its possible control in an eco-epidemiological model with alternative food source in predator and weak allee effect in prey species. B Nath, V Kumar, N Kumari, K Pada Das, S Maiti Nonlinear Studies 27 (3) , 2020 2020 Citations: 1
Controlling chaos in three species food chain model with fear effect V Kumar, N Kumari AIMS Math 5 (2), 828-842 , 2020 2020 Citations: 47
MOST CITED SCHOLAR PUBLICATIONS
Refugia and Allee effect in prey species stabilize chaos in a tri-trophic food chain model B Nath, N Kumari, V Kumar, KP Das Differential Equations and Dynamical Systems 30 (3), 631-657 , 2022 2022 Citations: 59
Controlling chaos in three species food chain model with fear effect V Kumar, N Kumari AIMS Math 5 (2), 828-842 , 2020 2020 Citations: 47
Bifurcation study and pattern formation analysis of a tritrophic food chain model with group defense and Ivlev-like nonmonotonic functional response V Kumar, N Kumari Chaos, Solitons & Fractals 147, 110964 , 2021 2021 Citations: 43
Modeling wind effect and herd behavior in a predator–prey system with spatiotemporal dynamics D Barman, V Kumar, J Roy, S Alam The European Physical Journal Plus 137 (8), 950 , 2022 2022 Citations: 38
Stability and bifurcation analysis of Hassell–Varley prey–predator system with fear effect V Kumar, N Kumari International Journal of Applied and Computational Mathematics 6 (5), 150 , 2020 2020 Citations: 33
Controlling chaos and pattern formation study in a tritrophic food chain model with cannibalistic intermediate predator N Kumari, V Kumar The European Physical Journal Plus 137 (3), 1-23 , 2022 2022 Citations: 26
Spatiotemporal dynamics and Turing patterns in an eco-epidemiological model with cannibalism V Kumar, N Kumari, RP Agarwal Results in Control and Optimization 9, 100183 , 2022 2022 Citations: 16
Pattern formation and delay-induced instability in a Leslie–Gower type prey–predator system with Smith growth function V Kumar Mathematics and Computers in Simulation 225, 78-97 , 2024 2024 Citations: 13
Stability and Bifurcation Analysis of Fractional-Order Delayed Prey–Predator System and the Effect of Diffusion V Kumar, N Kumari International Journal of Bifurcation and Chaos 32 (01), 2250002 , 2022 2022 Citations: 12
Pattern formation study of Hassell-Varley prey-predator system with fear effect V Kumar, N Kumari AIP Conference Proceedings 2435 (1), 020053 , 2022 2022 Citations: 8
Impact of nanoparticles on the dynamics of a Crowley–Martin type phytoplankton–zooplankton interaction model V Kumar, B Pramanick Results in Control and Optimization 8, 100139 , 2022 2022 Citations: 5
Exploring the Impact of Time Delay with Fractional Derivative and Diffusion in a Three-Species Food Chain Model V Kumar, N Kumari Iranian Journal of Science, 1-20 , 2025 2025 Citations: 1
Prey-taxis and time delay induced instabilities in a prey–predator system incorporating the smith growth function V Kumar International Journal of Biomathematics, 2550066 , 2025 2025 Citations: 1
A study of chaos and its possible control in an eco-epidemiological model with alternative food source in predator and weak allee effect in prey species. B Nath, V Kumar, N Kumari, K Pada Das, S Maiti Nonlinear Studies 27 (3) , 2020 2020 Citations: 1