Dr. Rishi Kumar Tiwari is a distinguished Professor of Mathematics with over 30 years of academic service, currently holding a post secured through the Madhya Pradesh Public Service Commission (2011). He earned his Ph.D. in Mathematics from A.P.S. University, Rewa, in 1998, following an M.Sc. with a Gold Medal. With a prolific research portfolio including 134 national and international publications and six authored books, he has supervised 21 Ph.D. scholars and continues to guide research in cosmology, general relativity, and differential geometry. Dr. Tiwari has presented his work globally, including in Italy, Germany, and South Africa, contributing to international scientific collaborations. His accolades include the DST-ICTP Fellowship (Italy), IASc-INSA-NASI Summer Research Fellowship, and the Shikshavid Samman (2023). Having served as Head of Departments and on multiple academic boards, Dr. Tiwari remains committed to advancing mathematics through education, research, and international cooperation in theoretical physics and cosmology.

Professional Profile 

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Education 

Dr. Rishi Kumar Tiwari holds a strong academic background in science and mathematics. He completed his Higher Secondary education from the Board of Secondary Education, Bhopal, in 1985 with a focus on Physics, Chemistry, and Mathematics. He earned his B.Sc. from A.P.S. University, Rewa, in 1988, and later completed his M.Sc. in Mathematics from the same university in 1990, earning an outstanding, which earned him a Gold Medal. He was awarded a Ph.D. in Mathematics from A.P.S. University in 1998. His doctoral work laid the foundation for a research career focused on general relativity, cosmological modeling, and tensor analysis. Dr. Tiwari’s academic credentials reflect a consistent record of academic excellence and deep subject mastery, serving as the cornerstone for his teaching, research, and scholarly contributions to the field of mathematics and cosmology over the last three decades.

Professional Experience 

Dr. Rishi Kumar Tiwari brings with him over 30 years of extensive teaching experience at both undergraduate and postgraduate levels. He has held several significant academic leadership roles, including Head of the Department of Mathematics and Computer Science at Pt. S.N. Shukla University, Shahdol, and formerly at Govt. Model Science College, Rewa. He has also been a member of various Boards of Studies across reputed institutions like A.P.S. University and Govt. T.R.S. College, Rewa. Selected through the M.P. Public Service Commission in 2011, Dr. Tiwari has not only imparted knowledge but also shaped curricula and research agendas. Under his mentorship, 21 Ph.D. scholars have completed their doctorates, with others currently under supervision. His ability to blend deep mathematical theory with modern cosmological applications makes him a respected academic figure in India. He continues to engage students and researchers in exploring advanced topics in mathematical physics.

Research Interest

Dr. Tiwari’s research interest lies primarily in the fields of General Relativity, Cosmology, Tensor Analysis, and Differential Geometry, with a particular emphasis on exploring homogeneous cosmological models and conharmonic curvature tensors. His contributions to understanding the expanding universe and dark energy models have been presented at premier international conferences, including the TAUP Series and the Texas Symposium on Relativistic Astrophysics. With 134 research papers in reputed journals and conferences, Dr. Tiwari has carved a niche in the academic study of mathematical models underpinning astrophysical phenomena. His involvement in UGC-funded research projects on Bianchi Models and Robertson-Walker cosmologies illustrates his commitment to foundational and applied research. Collaborating with institutions in South Africa and Europe, he frequently shares findings on time-varying deceleration parameters and symmetry models. His international exposure and research depth continue to influence global discussions on theoretical physics and contribute to the development of cosmological theory.

Award and Honors

Throughout his illustrious career, Dr. Rishi Kumar Tiwari has received several awards and fellowships that affirm his academic excellence and research impact. He was awarded the DST-ICTP Fellowship (Italy, 2008), recognizing his work in mathematical physics. In 2012, he received the prestigious IASc-INSA-NASI Summer Research Fellowship, further solidifying his standing in the Indian scientific community. His most recent recognition, the Shikshavid Samman from the Department of Higher Education, Madhya Pradesh (2023), honors his decades-long contribution to higher education and mentorship in mathematics. Additionally, Dr. Tiwari has received two major UGC research grants for his projects on cosmological models. These accolades, combined with invitations for popular and technical talks at institutions like the University of KwaZulu-Natal and Mangosuthu University in South Africa, showcase his international academic reputation. His dedication to theoretical exploration and student development continues to garner respect and admiration in the fields of mathematics and cosmology.

Publications Top Notes

• Title: Perfect fluid Bianchi Type-I cosmological models with time varying G and Λ
  Authors: JP Singh, RK Tiwari
  Year: 2008
  Citations: 63
  Source: Pramana – Journal of Physics, Vol. 70 (4), pp. 565–574

• Title: Bianchi type-I cosmological models with time dependent G and Λ
  Authors: RK Tiwari
  Year: 2008
  Citations: 43
  Source: Astrophysics and Space Science, Vol. 318 (3), pp. 243–247

• Title: Phase transition of LRS Bianchi type-I cosmological model in $f(R,T)$ gravity
  Authors: RK Tiwari, D Sofuoğlu, VK Dubey
  Year: 2020
  Citations: 42
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 17 (12), Article ID: 2050187

• Title: Cosmological tests of parametrization $q(z)$ in FLRW cosmology
  Authors: A Bouali, BK Shukla, H Chaudhary, RK Tiwari, M Samar, G Mustafa
  Year: 2023
  Citations: 41
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 20 (09), Article ID: 2350152

• Title: Scenario of two-fluid dark energy models in Bianchi type-III Universe
  Authors: RK Tiwari, A Beesham, BK Shukla
  Year: 2018
  Citations: 41
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 15 (11), Article ID: 1850189

• Title: Cosmological model with variable deceleration parameter in $f(R,T)$ modified gravity
  Authors: RK Tiwari, A Beesham, B Shukla
  Year: 2018
  Citations: 38
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 15 (07), Article ID: 1850115

• Title: Bianchi type-III cosmological models with gravitational constant G and the cosmological constant Λ
  Authors: JP Singh, RK Tiwari, P Shukla
  Year: 2007
  Citations: 36
  Source: Chinese Physics Letters, Vol. 24 (12), pp. 3325

• Title: Anisotropic model with decaying cosmological term
  Authors: RK Tiwari, A Beesham
  Year: 2018
  Citations: 33
  Source: Astrophysics and Space Science, Vol. 363 (11), Article: 234

• Title: Some Robertson-Walker models with time dependent G and Λ
  Authors: RK Tiwari
  Year: 2009
  Citations: 33
  Source: Astrophysics and Space Science, Vol. 321 (2), pp. 147–150

• Title: Time varying G and Λ cosmology in $f(R,T)$ gravity theory
  Authors: RK Tiwari, A Beesham, R Singh, LK Tiwari
  Year: 2017
  Citations: 31
  Source: Astrophysics and Space Science, Vol. 362 (8), Article: 143

• Title: Transit cosmological models with domain walls in f(R, T) gravity
  Authors: RK Tiwari, A Beesham, A Pradhan
  Year: 2017
  Citations: 30
  Source: Gravitation and Cosmology, Vol. 23 (4), pp. 392–400

• Title: Cosmological models with viscous fluid and variable deceleration parameter
  Authors: RK Tiwari, A Beesham, BK Shukla
  Year: 2017
  Citations: 30
  Source: The European Physical Journal Plus, Vol. 132 (1), Article: 20

• Title: An LRS Bianchi type-I cosmological model with time-dependent Λ term
  Authors: JP Singh, RK Tiwari
  Year: 2007
  Citations: 27
  Source: International Journal of Modern Physics D, Vol. 16 (04), pp. 745–754

• Title: Cosmographic studies of $q(z)$ parametrization in $f(R,T)$ framework
  Authors: BK Shukla, A Bouali, H Chaudhary, RK Tiwari, MS Martín
  Year: 2023
  Citations: 24
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 20 (14), Article ID: 2450007

• Title: Quadratically varying deceleration parameter in $f(R,T)$ gravity
  Authors: RK Tiwari, D Sofuoğlu
  Year: 2020
  Citations: 24
  Source: International Journal of Geometric Methods in Modern Physics, Vol. 17 (10), Article ID: 2030003

Conclusion 

Dr. Rishi Kumar Tiwari stands as a paragon of dedication, intellect, and international engagement in the realm of mathematical sciences. From earning a Gold Medal in his master’s studies to mentoring 21 Ph.D. scholars and producing an expansive body of scholarly work, he exemplifies the ideals of academic leadership. His prolific research, particularly in the areas of general relativity and cosmological modeling, has transcended national borders, earning him respect across continents. Participation in global scientific platforms and collaborations with African and European institutions underline his commitment to knowledge exchange and cross-cultural academic growth. With multiple leadership roles in universities and active contributions to curriculum development and academic governance, Dr. Tiwari continues to shape the future of mathematical education and research in India. His legacy is built not only on research excellence but also on his lifelong mission to inspire, educate, and innovate in the ever-evolving landscape of mathematical physics.