Functional Analysis, Operator Theory, Abstract Differential Equations, Nonlinear analysis. 

Research gate: https://www.researchgate.net/profile/Sachi-Srivastava

• Anand, J., Lata, S. & Srivastava, S. Weighted and Unweighted Composition Operators Close to Isometries. Mediterr. J. Math. 21, 144 (2024). https://doi.org/10.1007/s00009-024-02688-z 

• Ralph Chill, Praveen Sharma, Sachi Srivastava. Reiteration theorems for the interpolation of quasi-subadditive functions on Banach spaces.(2024) Under communication.

• Ralph Chill, Praveen Sharma, Sachi Srivastava. Real interpolation of functions with applications to accretive operators on Banach spaces, Journal of Differential Equations, Volume 402, 2024, Pages 554-592, https://doi.org/10.1016/j.jde.2024.05.024.

• Jatin Anand, Sneh Lata, Sachi Srivastava. Weighted and unweighted composition operators close to isometry.(2024) Under communication.

• Sahiba Arora, Ralph Chill, Sachi Srivastava. Domination of Semigroups on standard forms of von Nuemann Algebras Arch. Math.121, 715-729 (2023). https://doi.org/10.1007/s00013-023-01946y.

• Dharmendra Kumar and Sachi Srivastava. Quantum Extensions of Classical Jacobi Semigroups(2023) Under communication.

• Shard Rastogi, Sachi Srivastava. Polynomial Stability for abstract damped wave equations with delay. (2023) Under communication.

• Dharmendra Kumar, Kalyan B. Sinha, Sachi Srivastava. Quantum dynamical semigroups and stability. J. Math. Anal. Appl. 516 (2022), no. 1, Paper No. 126492, 21 pp.

• Jatin Anand and Sachi Srivastava. A Class of Invariant Subspaces of weighted composition operators on Hardy-Hilbert Spaces. Anal. Math. 48 (2022), no. 4, 925-937.

• Jatin Anand, Niteesh Sahani and Sachi Srivastava. On extension of Beurling Helson Lowdenslager theorem. Advances in Operator Theory. 6(4) 2021.

• Franco Fagnola, Dharmendra Kumar and Sachi Srivastava. A Quantum Laugerre Semigroup. Indian Journal of Pure and Applied Mathematics. 52, (2021), 1201-1200.

• Shard Rastogi and Sachi Srivastava. Strong and Polynomial Stability for Delay Semigroups. Journal of Evolution Equations. 21(2021), no. 1, 441-472.

• Dharmendra Kumar, Kalyan B. Sinha and Sachi Srivastava. Stability of the Markov (Conservativity) Property under Perturbations. Infin. Dimens. Anal. Quantum Probab. Relat. Top. 23 (2020), no. 2, 2050009, 20 pp.

• Abhay Kumar and Sachi Srivastava. Supercyclicity Criteria for C0-Semigroups. Adv. Oper. Theory 5 (2020), no. 4, 1646-1666.

• Anand, J., Bhattacharyya, T. and Srivastava, S. Some thoughts on composition operators on subspaces of the Hardy space. Arch. Math. (Basel) 114, no. 4, 431-444, 2020.

• Isabelle Chalendar, Wolfgang Arendt, Mahesh Kumar and Sachi Srivastava. Powers of composition operators: Asymptotic behaviour on Bergman, Dirichlet and Bloch spaces J. Aust. Math. Soc. 108, no. 3, 289-320, 2020.

• Tarachand Prajapati, K.B. Sinha and Sachi Srivastava. Lyapunov property of positive C0 semigroups on non-commutative Lp spaces. Operators and Matrices, Volume 13, Number 4 (2019), 907-919.

• Abhay Kumar and Sachi Srivastava. Supercyclic C0 semigroups, stability and somewhere dense orbits. Journal of Mathematical Analysis and Applications, 476, 539-548, 2019.

• Shard Rastogi and Sachi Srivastava. Non-analytic growth bound and delay semigroups. Semigroup Forum 99, no. 3, 788-813, 2019.

• Mahesh Kumar and Sachi Srivastava. Convergence of powers of composition operators on certain spaces of Holomorphic functions defined on the right half plane. Archiv der Mathematik,110(5), 487-500, 2018.

• Isabelle Chalendar, Wolfgang Arendt, Mahesh Kumar and Sachi Srivastava. Asymptotic behaviour of powers of composition operators on Banach spaces of Holomorphic functions. Indiana Univ. Math. J. 67 (2018), 1571-1595

•  K.B. Sinha and Sachi Srivastava. Theory of Semigroups and Applications. TRIM series, Hindustan Book Agency, 2017. Electronic version published by Springer.

• Sharad Rastogi and Sachi Srivastava. Quasi-hyperbolicity and delay semigroups. Abstract and Applied Analysis. Article ID 1984874. 2016.

• C.J.K. Batty, R. Chill and S. Srivastava. Maximal Regularity for some Interpolation Sapces. Operator semigroups meet Complex Analysis, Harmonic Analysis and Mathematical Physics Operator Theory: Advances and Applications, Vol 250, 49-66, Birkhauser, 2015.

• B.V.R. Bhat and S. Srivastava. Stability of Quantum dynamical semigroups. Operator semigroups meet Complex Analysis, Harmonic Analysis and Mathematical Physics Operator Theory: Advances and Applications, Vol 250, 67-85, Birkhauser, 2015.

• C.J.K.Batty, R. Chill and S.Srivastava. Maximal regularity for certain non-autonomous second order Cauchy problems. Studia Mathematica. no. 256, (2008), 205 - 223.

• R. Chill and S. Srivastava. Lp Maximal regularity for second order Cauchy problems is independent of p. Boll. Unione Mat. Ital., Series IX, Vol. 1 - 1, (2008), 147 - 158.

• R. Chill and S. Srivastava. Lp Maximal regularity for second order Cauchy problems. M. Zeitschrift, 251 (2005), No. 4,751 -781.

• C.J.K. Batty and S. Srivastava. The non-analytic growth bound of a C0 semigroup and inhomogeneous Cauchy problems. Journal of Differential Equations, 194 (2003) 300-327.

• C.J.K. Batty, M. Blake and S. Srivastava. A non-analytic growth bound for semigroups of operators and Laplace transforms. Integral Equations and Operator Theory, Vol. 45 (2003), No. 2, 1251-54.

• Feb 2017 onwards. Professor, Department of Mathematics, University of Delhi, Delhi

•  Feb 2010 - Feb 2017. Associate Professor, Department of Mathematics University of Delhi, Delhi.

•  Feb 2007 - Jan 2010. Reader, Department of Mathematics University of Delhi, Delhi.

• Jul 2002 to Jan 2007. Senior Lecturer, Department of Mathematics Lady Shri Ram College, University of Delhi.

• Jul 1995 to Jul 2002. Lecturer, Department of Mathematics Lady Shri Ram College, University of Delhi. (On study leave from Oct 1998 to July 2002)

• 2002, DPhil in Mathematics St. Johns College, University of Oxford

Supervisor: C.J.K. Batty

Thesis Title: Laplace transforms,non-analytic growth bounds and C0-semigroups

• 1996, M.Phil in Mathematics, University of Delhi

Supervisor: Ajit Iqbal Singh

Thesis Title: Second Dual of a group algebra, First Class with Distinction.

• 1994, M.A. in Mathematics, Lady Shri Ram College, Univ. of Delhi

Aggregate marks: 93%

2nd Position in the University in M.A./M.Sc.

•  1992, B.A.(Hons) in Mathematics, Lady Shri Ram College, Univ. of Delhi

Aggregate marks: 92.3%

2nd Position in the University in B.A./B.Sc. (Hons)

• Indian National Science Academy Teachers Award 2020.

• Commonwealth Research Award Association of Commonwealth Universities, UK, 1998.

• National Board for Higher Mathematics Research Award Department of Atomic Energy, Government of India, 1994.

• National Board for Higher Mathematics Award for Masters program Department of Atomic Energy, Government of India, 1992.

• 1991 - 1994 Best Student in Mathematics (four consecutive years), Lady Shri Ram College.

• 2nd Position in Allahabad in ISC Class XII examinations, 1989 with 93% aggregate marks.

• July 2022, Invited Visitor, Department of Mathematics, Newcastle University, Newcastle, UK.

• March 2019 to May 2019, Invited Visitor, Department of Mathematics, University of California, Berkeley, USA.

•  June 2015. Invited Visitor, Mathematical Institute, University of Oxford, UK.

• Dec 2005 to Nov 2006, Research Associate, Department of Mathematics Indian Institute of Science, Bangalore. (On academic leave from Lady Shri Ram College )

• April 2005 to May 2005, Invited Visitor, Department of Mathematics, University of Berkeley, USA.

•  May 2004 to July 2004, Invited Visitor, Mathematical Institute, University of Oxford, UK.

• May 2003 to July 2003. Visiting research scholar, Department of Applied Analysis, University of Ulm, Germany.

• Member, Executive Committee, Ramanujan Mathematical Society, 2022 -

• Convener, Research Publications Committee, Ramanujan Mathematical Society, 2022 -

• Member, Executive Committee, Indian Women in Mathematics, NBHM sponsored project, 2016-

• Member, American Mathematical Society and Ramanujan Mathematical Society.

• Mahesh Kumar. Asymptotics of composition operators on Banach spaces of holomorphic functions. May 2019.

• Shard Rastogi. Operator Semigroups for Delay Differential Equations. October 2019.

• Abhay Kumar. Supercyclic C0 semigroups. 2021.

• Tarachand Prajapati. Operator semigroups on non-commutative Lp spaces. August 2021.

•  Dharmendra Kumar.Conservativity, Stability and Perturbations of Quantum Dynamical Semigroups. April 2022.

•  Jatin Anand. Composition Operators and Invariant subspaces. March 2022.

• Pappu Anuragi. Positive C0-semigroups. (Ongoing)

• Praveen Sharma. Non-linear Semigroups. (Ongoing)

•  Pooja. (ongoing)

• Sahiba Arora. Eventually positive C0 semigroups. March 2019.

• Himani Sharma. Semigroups of Composition Operators. December 2017.

• Geeta. Isometries and Semigroups of Isometries on Hilbert C* Modules. August 2017.

• Reena. Quasi Hyperbolic Semigroups of Operators. December 2016.

• Rachna Shokhanda. Cayley Transform of the Generator of a C0 Semigroup. Oct 2015.

• Mahesh Kumar. Norm Continuity of C0 Semigroups, June 2011.