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You searched for +publisher:"Indian Institute of Science" +contributor:("Thangavelu, Sundaram"). Showing records 1 – 3 of 3 total matches.

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Indian Institute of Science

1. Boggarapu, Pradeep. Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups.

Degree: PhD, Faculty of Science, 2018, Indian Institute of Science

This thesis is divided into three parts. In the first part we study mixed norm estimates for Riesz transforms associated with various differential operators. First we prove the mixed norm estimates for the Riesz transforms associated with Dunkl harmonic oscillator by means of vector valued inequalities for sequences of operators defined in terms of Laguerre function expansions. In certain cases, the result can be deduced from the corresponding result for Hermite Riesz transforms, for which we give a simple and an independent proof. The mixed norm estimates for Riesz transforms associated with other operators, namely the sub-Laplacian on Heisenberg group, special Hermite operator on Cd and Laplace-Beltrami operator on the group SU(2) are obtained using their Lpestimates and by making use of a lemma of Herz and Riviere along with an idea of Rubio de Francia. Applying these results to functions expanded in terms of spherical harmonics, we deduce certain vector valued inequalities for sequences of operators defined in terms of radial parts of the corresponding operators. In the second part, we study the chaotic behavior of the heat semigroup generated by the Dunkl-Laplacian ∆_κ on weighted LP-spaces. In the general case, for the chaotic behavior of the Dunkl-heat semigroup on weighted Lp-spaces, we only have partial results, but in the case of the heat semigroup generated by the standard Laplacian, a complete picture of the chaotic behavior is obtained on the spaces Lp ( Rd,〖 (φiρ (x ))〗2 dx) where φiρ the Euclidean spherical function is. The behavior is very similar to the case of the Laplace-Beltrami operator on non-compact Riemannian symmetric spaces studied by Pramanik and Sarkar. In the last part, we study mixed norm estimates for the Cesáro means associated with Dunkl-Hermite expansions on〖 R〗d. These expansions arise when one considers the Dunkl-Hermite operator (or Dunkl harmonic oscillator)〖 H〗_κ:=-Δ_κ+|x|2. It is shown that the desired mixed norm estimates are equivalent to vector-valued inequalities for a sequence of Cesáro means for Laguerre expansions with shifted parameter. In order to obtain the latter, we develop an argument to extend these operators for complex values of the parameters involved and apply a version of Three Lines Lemma. Advisors/Committee Members: Thangavelu, Sundaram (advisor).

Subjects/Keywords: Dunkl Transforms; Dunkl Heat Semigroups; Differential Operators; Riesz Transforms; Dunkl-Laplacian; Dunkl Harmonic Oscillator; Heisenberg Group; Heat Semigroups Chaotic Behavior; Dunkl-Hermite Expansions; Dunkl-Hermite Operators; Dunkl Operators; Cesaro Means; Laguerre Function Expansions; Dunkl Heat Semigroup; Mathematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Boggarapu, P. (2018). Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2958

Chicago Manual of Style (16th Edition):

Boggarapu, Pradeep. “Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed October 20, 2020. http://etd.iisc.ac.in/handle/2005/2958.

MLA Handbook (7th Edition):

Boggarapu, Pradeep. “Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups.” 2018. Web. 20 Oct 2020.

Vancouver:

Boggarapu P. Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2020 Oct 20]. Available from: http://etd.iisc.ac.in/handle/2005/2958.

Council of Science Editors:

Boggarapu P. Mixed Norm Estimates in Dunkl Setting and Chaotic Behaviour of Heat Semigroups. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2958


Indian Institute of Science

2. Sanjay, P K. Riesz Transforms Associated With Heisenberg Groups And Grushin Operators.

Degree: PhD, Faculty of Science, 2015, Indian Institute of Science

We characterise the higher order Riesz transforms on the Heisenberg group and also show that they satisfy dimension-free bounds under some assumptions on the multipliers. We also prove the boundedness of the higher order Riesz transforms associated to the Hermite operator. Using transference theorems, we deduce boundedness theorems for Riesz transforms on the reduced Heisenberg group and hence also for the Riesz transforms associated to special Hermite and Laguerre expansions. Next we study the Riesz transforms associated to the Grushin operator G = - Δ - |x|[email protected] on Rn+1. We prove that both the first order and higher order Riesz transforms are bounded on Lp(Rn+1): We also prove that norms of the first order Riesz transforms are independent of the dimension n. Advisors/Committee Members: Thangavelu, Sundaram (advisor).

Subjects/Keywords: Riesz Transforms; Heisenberg Groups; Grushin Operators; Differential Operators; Heisenberg Group; Hermite Polynomials; Hermite Functions; Laguerre Functions; Hermite Expansion; Laguerre Expansion; Mathematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sanjay, P. K. (2015). Riesz Transforms Associated With Heisenberg Groups And Grushin Operators. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2496

Chicago Manual of Style (16th Edition):

Sanjay, P K. “Riesz Transforms Associated With Heisenberg Groups And Grushin Operators.” 2015. Doctoral Dissertation, Indian Institute of Science. Accessed October 20, 2020. http://etd.iisc.ac.in/handle/2005/2496.

MLA Handbook (7th Edition):

Sanjay, P K. “Riesz Transforms Associated With Heisenberg Groups And Grushin Operators.” 2015. Web. 20 Oct 2020.

Vancouver:

Sanjay PK. Riesz Transforms Associated With Heisenberg Groups And Grushin Operators. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2015. [cited 2020 Oct 20]. Available from: http://etd.iisc.ac.in/handle/2005/2496.

Council of Science Editors:

Sanjay PK. Riesz Transforms Associated With Heisenberg Groups And Grushin Operators. [Doctoral Dissertation]. Indian Institute of Science; 2015. Available from: http://etd.iisc.ac.in/handle/2005/2496


Indian Institute of Science

3. Garg, Rahul. On The Role Of The Bargmann Transform In Uncertainty Principles.

Degree: PhD, Faculty of Science, 2014, Indian Institute of Science

Subjects/Keywords: Functional Transforms; Bargmann Transforms; Analytic Vectors; Hardy's Theorem; Weyl Transform; Beurling's Theorem; Schrodinger Representations; Mathematics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Garg, R. (2014). On The Role Of The Bargmann Transform In Uncertainty Principles. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2290

Chicago Manual of Style (16th Edition):

Garg, Rahul. “On The Role Of The Bargmann Transform In Uncertainty Principles.” 2014. Doctoral Dissertation, Indian Institute of Science. Accessed October 20, 2020. http://etd.iisc.ac.in/handle/2005/2290.

MLA Handbook (7th Edition):

Garg, Rahul. “On The Role Of The Bargmann Transform In Uncertainty Principles.” 2014. Web. 20 Oct 2020.

Vancouver:

Garg R. On The Role Of The Bargmann Transform In Uncertainty Principles. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2014. [cited 2020 Oct 20]. Available from: http://etd.iisc.ac.in/handle/2005/2290.

Council of Science Editors:

Garg R. On The Role Of The Bargmann Transform In Uncertainty Principles. [Doctoral Dissertation]. Indian Institute of Science; 2014. Available from: http://etd.iisc.ac.in/handle/2005/2290

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