A note on dual giant gravitons in AdS4×CP3AdS_{4}\times \mathbb{CP}^{3}

We study some of the properties of dual giant gravitons - D2-branes wrapped on an $S^{2}\subset AdS_{4}$ - in type IIA string theory on $AdS_{4}\times \mathbb{CP}^{3}$. In particular we confirm that the spectrum of small fluctuations about the giant is both real and independent of the size of the graviton. We also extend previously developed techniques for attaching open strings to giants to this D2-brane giant and focus on two particular limits of the resulting string sigma model: In the pp-wave limit we quantize the string and compute the spectrum of bosonic excitations while in the semiclassical limit, we read off the fast string Polyakov action and comment on the comparison to the Landau-Lifshitz action for the dual open spin chain.Comment: v3 significantly changed: added coupling to RR 1-form and turned on worldvolume gauge field, computed gauge field fluctuation, added comments on closure of the sl(2) sector and re-written to improve clarity. This version published in JHE

EFFECT OF MN CONTENT ON THE STRUCTURAL & OPTICAL PROPERTIES OF CO PRECIPITATED MN -ZnO NANO PARTICLES.

Metal oxide nanoparticle applications in energy storage devicewhich receive attention for the future energy requirement. These transition metaloxides, when falling in the nanosized that process more applications in the field suchas data storage, spintronics, biomedicine and telecommunication. Mn-ZnOnanoparticles were synthesized by Co Precipitation method. The oxalic acid solutiondrop wise added to the metal salt solution with continuous stirring to get light pinkprecipitate dried at 1000C . The synthesized powder was calcined at varioustemperatures. Such as 2000C, 3000C, 4000C to obtain block color Mn-ZnOnanoparticles. These particles thus prepared were characterized by FTIR, UV-Visible.The optical band gap of Mn-ZnO nanoparticle was estimated by UV-VisibleSpectroscopy .The direct band gap values were found to be 2.1eV, 2.5eV, and 3eV

Emergence of the fuzzy horizon through gravitational collapse

For a large enough Schwarzschild black hole, the horizon is a region of space where gravitational forces are weak; yet it is also a region leading to numerous puzzles connected to stringy physics. In this work, we analyze the process of gravitational collapse and black hole formation in the context of light-cone M theory. We find that, as a shell of matter contracts and is about to reveal a black hole horizon, it undergoes a thermodynamic phase transition. This involves the binding of D0 branes into D2's, and the new phase leads to large membranes of the size of the horizon. These in turn can sustain their large size through back-reaction and the dielectric Myers effect - realizing the fuzzball proposal of Mathur and the Matrix black hole of M(atrix) theory. The physics responsible for this phenomenon lies in strongly coupled 2+1 dimensional non-commutative dynamics. The phenomenon has a universal character and appears generic.Comment: 24 pages, 4 figures; v2: minor clarifications, citations adde

Towards a Realization of the Condensed-Matter/Gravity Correspondence in String Theory via Consistent Abelian Truncation

We present an embedding of the 3-dimensional relativistic Landau-Ginzburg model for condensed matter systems in an $\mathcal{N}=6$, $U(N)\times U(N)$ Chern-Simons-matter theory (the ABJM model) by consistently truncating the latter to an abelian effective field theory encoding the collective dynamics of ${\cal O}(N)$ of the ${\cal O}(N^2)$ modes. In fact, depending on the VEV on one of the ABJM scalars, a mass deformation parameter $\mu$ and the Chern-Simons level number $k$, our abelianization prescription allows us to interpolate between the abelian Higgs model with its usual multi-vortex solutions and a $\phi^4$ theory. We sketch a simple condensed matter model that reproduces all the salient features of the abelianization. In this context, the abelianization can be interpreted as giving a dimensional reduction from four dimensions.Comment: 4 pages, revtex; reference added, typo corrected; added clarifying paragraphs at end of introduction and on pages 3-4. Version accepted to PR

USE OF LIBRARY RESOURCES AND SERVICES AMONG PG STUDENTS AND RESEARCH SCHOLARS OF ALAGAPPA UNIVERSITY : A STUDY

The main purpose of the study and use of Library resources and Services of Information. The researcher prepared questionnaire with 13 questions to be answered by the respondents about the level and Use of Library Resources and services of the 100 Questionnaries distributed 90 taken for the analysis 65.55% the respondents belong to Female category, 42.22% of the respondents belong to the age group of 26 – 30, 40.00% of respondents belong to the category of Ph.D scholars, 43.33% of respondents belong to the rural area, 42.22% of respondents belong to the Access at Library, 33.33% of respondents belong to the Daily time spent, 22.22% of respondents belong to the purpose of Consult materials for research, 38.88% of respondents belong to the Theses/Dissertations, 23.33% of Respondents belong to the reference services, 32.22% of Respondents belong to theUtilization of Index and abstract, 36.66% of Respondents belong to the Insufficient Internet Access points, 41.11% of Respondents belong to theHighly satisfied

INFORMATION NEEDS AND USE OF LIBRARY RESOURCES BY DIFFERENTLY ABLED SCHOOL STUDENTS, SIVAGANGAI DISTRICT: A CASE STUDY

The Study Analysed Information needs and use of library resources by Differently abled school students.54.08% of the Respondents belong to the female students, 32.65% of respondents were in the age group of below12, (35.71%) respondents were in the group of students 1st-5th, (73.47%) respondents were physically challenged with of use electronic resources, (29.59%) respondents accessed electronic resources Monthly, 50(51.02%) respondents were satisfied with the relevance of the electronic resources, (87.75%) respondents were read of the regularly Newspaper in electronic resources available from the library,73.46% of respondents were Easy to access,92 (93.87%) respondents were visited in other library of the electronic resources available from the library,53(54.08%) respondents used electronic resources to prepare for Education,89 (90.81%) respondents were using internet of the electronic resources available from the library,67(68.37%) respondents used electronic resources to education in library,87 (88.77%) respondents were aware of the electronic resources available from the library,that 65(66.33%) respondents used electronic resources to prepare Textbook,the majority 72 (73.47%) respondents were physically challenged with of use electronic resources,48 (48.98%) respondents need for information in electronic resources to employment information need,journal and books were the most used information resources by the respondents (38, 38.78%)The survey research design was used for the study. The total population includes 132 registered users of the library made up of students from selected Government Schools and community users.A total number of 132 questionnaires were distributed among the respondents. The investigator could collect questionnaires from only 98 out of 132 respondents among whom the questionnaires were distributed

Quantifying selection in immune receptor repertoires

The efficient recognition of pathogens by the adaptive immune system relies on the diversity of receptors displayed at the surface of immune cells. T-cell receptor diversity results from an initial random DNA editing process, called VDJ recombination, followed by functional selection of cells according to the interaction of their surface receptors with self and foreign antigenic peptides. To quantify the effect of selection on the highly variable elements of the receptor, we apply a probabilistic maximum likelihood approach to the analysis of high-throughput sequence data from the $\beta$-chain of human T-cell receptors. We quantify selection factors for V and J gene choice, and for the length and amino-acid composition of the variable region. Our approach is necessary to disentangle the effects of selection from biases inherent in the recombination process. Inferred selection factors differ little between donors, or between naive and memory repertoires. The number of sequences shared between donors is well-predicted by the model, indicating a purely stochastic origin of such "public" sequences. We find a significant correlation between biases induced by VDJ recombination and our inferred selection factors, together with a reduction of diversity during selection. Both effects suggest that natural selection acting on the recombination process has anticipated the selection pressures experienced during somatic evolution

Report of Acoustic Test on PSLV IS.1/2L Structure

The results of acoustic conducted on PSLV IS.1/2L at Acoustic Test Facility are briefly given. It contains test set up, Instrumentation details and tables of spectral response

Ab-inito study on different phases of ferromagnetic CeMnNi4

Using first-principles density functional calculations, we study the possible phases of CeMnNi$_{4}$ and show that the ground state is ferromagnetic. We observed the hexagonal phase to be lowest in energy whereas experimentally observed cubic phase lies slightly higher in energy. We optimized the structure in both phases and in all different magnetic states to explore the possibility of the structural and magnetic phase transitions at ground state. We do not find any phase transitions between the magnetic and non-magnetic phases. The calculated structural, magnetic properties of cubic phase are in excellent agreement with experiments. Further, we do not observe half metallic behavior in any of the phases. However, the cubic phase does have fewer density of states for down-spin component giving a possibility of forming half metallic phase artificially, introducing vacancies, and disorder in lattice