Speaker:

Dr. Anand K. Jha (Dept. Of Physics, IIT Kanpur)

Title:

Temporal Coherence in Two-Photon Interference - II

Date:

July 4th, 2013

Time:

11:00 am - 12:00 noon.

Venue:

FB 482

Speaker:

Dr. Anand K. Jha (Dept. Of Physics, IIT Kanpur)

Title:

Temporal Coherence in Two-Photon Interference

Date:

June 18th, 2013

Time:

11:00 am - 12:00 noon.

Venue:

FB 482

Abstract:

In the earlier two talks, we had discussed two-photon interference and
entanglement from a very broad perspective. The aim of this talk (and the
next few) is to get into in-depth discussions about two-photon
interference and related phenomena. In this talk we will be discussing the
role of temporal coherence and indistinguishability in two-photon
interference. We will keep our discussions of temporal coherence centered
around parametric down-conversion, a non-linear optical phenomenon that
produces entangled two-photon field.

Speaker:

Dr. Kedar B. Khare (Dept. Of Physics, IIT Delhi)

Title:

How many measurements are needed to generate an N-pixel image?

Date:

June 10th, 2013

Time:

11:00 am - 12:00 noon.

Venue:

FB 382

Abstract:

In Scientific and Technological research ranging from sub-nano to astronomical length scales, imaging systems are playing a key role as tools that allow us to visualize natural phenomena or objects of interest,thereby, directly influencing new discoveries. With ever increasing demands on imaging performance (e.g. resolution, speed, sensitivity to
noise, etc.), it is becoming clear that imaging systems of tomorrow need to acquire, process and utilize imaging data in an efficient non-redundant manner. In this seminar I will discuss some current ideas on imagerecovery from "incomplete" or sub-Nyquist sampled data with examples from my own research work in diagnostic healthcare and optical imaging. It will be shown that a hybrid approach - combining imaging hardware and new image recovery algorithm ideas - allows us to overcome conventionally perceived limits on imaging systems.

Speaker:

Dr. Anurag Sahay ( Inst. of Physics, Bhubaneswar)

Title:

Tunnelling in Anti de Sitter Space and in its Boundary Matrix Dual

Date:

07.06.2013 ( Friday)

Time:

4:00 PM

Venue:

FB 382

Abstract:

For charged black hole, within the grand canonical ensemble, the decay rate from thermal AdS to the black hole at a fixed high temperature increases with the chemical potential. We check that this feature is well captured by a phenomenological matrix model expected to describe its strongly coupled dual. This comparison is made by explicitly constructing the kink and bounce solutions around the de-confinement transition and
evaluating the matrix model effective potential on the solutions.

Speaker:

Dr. Anand Kumar Jha (Dept. Of Physics, IIT Kanpur)

Title:

Two-Phonton Interference and Entanglement - II

Date:

May 7th, 2013 (Friday)

Time:

4:15-5:15 pm

Venue:

FB-382

Speaker:

Dr. Anand Kumar Jha (Dept. Of Physics, IIT Kanpur)

Title:

Two-Phonton Interference and Entanglement - I

Date:

May 3rd, 2013 (Friday)

Time:

3:45-5:00 pm

Venue:

FB-382

Speaker:

Prof. S. Dutta Gupta (University of Hyderabad, Hyderabad)

Title:

Bending light the wrong way!

Date:

17 April 2013

Time:

3.00 PM

Venue:

FB 382

Speaker:

Ravi Manohar (IITK)

Title:

A lightfront non-perturbative study of generalized parton distributions

Date:

March 12, Tuesday

Time:

4 pm

Venue:

FB-382

Abstract:

We give a study of interface between the nonperturbative lightfront amplitude calculation for an electron in a trap and an experimentally-accessible distribution functions using such light front amplitudes. It will be helpful to investigate these distribution functions at weak (QED) coupling as well as at an artificially large coupling. Additionally it will be interesting to map out the effects of a confining potential (external harmonic oscillator) trap on these distribution functions. Epoch to this project, we investigate the generalized parton distributions H(x,\zeta;,t) in the forward limit for a dressed-electron using the nonperturbative lightfront amplitude calculated in the harmonic oscillator basis.

Speaker:

Mridupawan Deka (JINR, Dubna, Russia).

Title:

Quark and Gluon Angular Momenta Contributions to Nucleon Spin

Date:

26 February, Tuesday

Time:

4 pm

Venue:

FB-382

Abstract:

The nucleon spin structure has been a longstanding issue in hadronic physics, both experimentally and theoretically. From the polarized Deep Inelastic Scattering experiments and Lattice QCD calculations, it has been found that the contribution coming from the quark spin is rather small (~25%). Now, it is widely accepted that the rest of the nucleon spin should come from the gluon spin and the orbital angular momenta of quarks and gluons. In this talk, I will present a complete Lattice QCD calculation of the quark and glue angular momenta inside a proton. The calculation is carried out on a 16^3×24 quenched lattice using the standard Wilson action.

Speaker:

Dr. R. Chelakkot, School of Engineering and Applied Sciences (SEAS), Harvard University, USA

Title:

Semiflexible polymers: Instabilities under confinement,
constraint and activity.

Date:

18 February (Monday)

Time:

4:00 PM

Venue:

FB 382

Speaker:

Bindusar Sahoo (Nikhef, Amsterdam)

Title:

Topologically massive higher-spin gravity

Date:

February 13, wednesday

Time:

4 pm

Venue:

FB-382

Abstract:

In the last couple of decades a theory has been developed by Vasiliev to consider interacting theories of fields with spin greater than 2 which is known as higher-spin gravity. This theory has received a lot of attention recently in the context of AdS-CFT correspondence. The theory in various dimensions is conjectured to be dual to well known conformal field theories in the boundary. In the light of this recent development, we will discuss the higher-spin analogue of topologically massive gravity in three dimensions, which we call topologically massive higher-spin gravity. We will start with a brief introduction and motivation to consider higher-spin theories. This will be followed by a brief introduction and overview of current results in higher-spin theories and topologically massive gravity. This will be followed by our work on topologically massive higher-spin gravity. We will discuss various semi classical as well as quantum results of the theory considered by us.

Speaker:

Arnab Kundu (Univ of Texas at Austin)

Title:

Dynamics of Fundamental Flavours in Holographic Duals of Large N Gauge Theories.

Date:

Feb 4, 2013 Monday

Time:

2:30 pm

Venue:

FB-382

Abstract:

Using the gauge-gravity duality, more specifically the AdS/CFT correspondence, we will discuss strongly coupled dynamics of fundamental flavours in large N gauge theories. We will primarily focus on the physics of chiral symmetry breaking by introducing flavour degrees of freedom in the so called Klebanov-Witten model. We will discuss the physics of the flavour sector in and beyond the probe limit. We will conclude with some general remarks.

Speaker:

Dr. Umakanta Tripathy (Visiting Scientist, TIFR, Mumbai)

Title:

Detecting malaria and imaging extra cellular matrix in tissues by multi-modal nonlinear laser scanning microscopy (NLSM)

Date:

5th February, 2013

Time:

12:00 noon

Venue:

FB 382

Abstract:

Multi-modal nonlinear laser scanning microscopy (NLSM), also known as multiphoton microscopy or higher harmonic generation microscopy is a powerful research tool that combines the advanced optical techniques of laser scanning microscopy with long wavelength multi- photon fluorescence excitation to capture high resolution and threedimensional (3D) images of specimens. Some of the core advantages that include label free imaging, depth imaging & minimizing photo-bleaching allows investigations on thick, living and fixed cells/tissues that would not otherwise be possible with conventional imaging techniques. Two-photon fluorescence (TPF), second harmonic generation (SHG), & third harmonic generation (THG) techniques are used as imaging tools. In the present talk, we will focus the use of multi-modal NLSM as an imaging device for the early detection and quantification of the malaria pigment (hemozoin) by THG technique. The obtained results will guide the optimal design of malaria detection technologies that exploit the THG response of hemozoin. In addition, multi-modal NLSM imaging of extra cellular matrix in tissues (collagen and elastin) to investigate the structural remodeling of the human ascending aorta with dilation, and documenting the geometrical properties of vocal folds (human & porcine) by SHG and TPF technique will also be presented. The results acquired would provide valuable information for better understanding the tissue biomechanics that may assist clinicians for rapid and reliable disease diagnosis.

Speaker:

Prof. Dharam Vir Ahluwalia (Universidade Estadual de Campinas, Brazil
and TIFR)

Title:

Elko Spinors and dark matter

Date:

17 January, Thursday

Time:

11 AM - 1 PM and 4 PM - 6 PM (with refreshment breaks)

Venue:

382 FB

Speaker:

Dr. Prasanna Kulkarni,
( Departamento de Fisica de la MateriaCondensada,Universidad Autonoma de Madrid, Madrid,Spain )

Title:

Elko Spinors and dark matter

Date:

17 January, Thursday

Time:

11 AM - 1 PM and 4 PM - 6 PM (with refreshment breaks)

Venue:

382 FB

Speaker: 
Title: 
Date: 
Time: 
Venue:

Purnendu Chakraborty
Gluon condensate and nonperturbative QCD propagators above deconfinement temperature
02 Jan 2013 (Wednesday)
4:00 PM (FB382)

Speaker: 
Title: 
Date: 
Time: 
Venue:

Udai Raj Singh
Inhomogeneous superconducting gap and symmetry breaking in FeSe0.4Te0.6 studied by spectroscopic imaging STM
27 Dec 2012 (Thursday)
11:00 AM (FB382)

Speaker:
Title:
Date:
Time:
Venue:

Dr. T. Arun Kumar 
Study of perfluoropolymer as an alignment layer for nematic liquid crystals
27 Dec 2012 (Thursday)
4:00 PM 
FB382

Speaker:
Title:
Date:
Time:
Venue:

Prof. Dharam Vir Ahluwalia 
Elko Dark Matter
24 Dec 2012 (Monday)
4:00 PM 
FB382

Speaker:
Title:
Date:
Time:
Venue:

Dr. Amar Nath Gupta
Transition path time, diffusion constant and folding rate of protein determined from reconstructed free-energy landscape analysis 
12 Dec 2012 (Wednesday)
4:00 PM (FB382)

Speaker:
Title:
Date:
Time:
Venue:

Dr. Shiva Kumar Malapaka, Leeds University, UK
A study of magnetic helicity in forced and decaying 3D-MHD turbulence
4 pm
FB-382

Speaker:
Title:
Date:
Time:
Venue:

Dr. Anindya Das
Superconductor-semiconductor junctions: Cooper pairs splitting and Majorana quasiparticles 
22 Nov 2012 (Thursday)
4:00 PM (FB382)

Speaker:
Title:
Date:
Time:
Venue:

Dr. Naveen Kumar
Relativistic beam-plasma interaction and its applications for particle acceleration and fast ignition fusion in plasmaa 
20 Nov 2012 (Tuesday)
11:00 am 
FB 382

Speaker:
Title:
Date:
Time:
Venue:

T. K. Saxena
Automation in research and industry
6th Nov 2012 (Tuesday)
4:00 pm
FB 382