Indrani Banerjee
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Continuous Gravitational Wave from Magnetized White Dwarfs and Neutron Stars: Possible Missions for LISA, DECIGO, BBO, ET Detectors
MNRAS 000,1{16 (2019) Preprint 8 January 2020 Compiled using MNRAS LATEX style file v3.0 Continuous gravitational wave from magnetized white dwarfs and neutron stars: possible missions for LISA, DECIGO, BBO, ET detectors Surajit Kalita? and Banibrata Mukhopadhyay† Department of Physics, Indian Institute of Science, Bangalore 560012, India Accepted XXX. Received YYY; in original form ZZZ ABSTRACT Recent detection of gravitational wave from nine black hole merger events and one neutron star merger event by LIGO and VIRGO shed a new light in the field of as- trophysics. On the other hand, in the past decade, a few super-Chandrasekhar white dwarf candidates have been inferred through the peak luminosity of the light-curves of a few peculiar type Ia supernovae, though there is no direct detection of these objects so far. Similarly, a number of neutron stars with mass > 2M have also been observed. Continuous gravitational wave can be one of the alternate ways to detect these com- pact objects directly. It was already argued that magnetic field is one of the prominent physics to form super-Chandrasekhar white dwarfs and massive neutron stars. If such compact objects are rotating with certain angular frequency, then they can efficiently emit gravitational radiation, provided their magnetic field and rotation axes are not aligned, and these gravitational waves can be detected by some of the upcoming de- tectors, e.g. LISA, BBO, DECIGO, Einstein Telescope etc. This will certainly be a direct detection of rotating magnetized white dwarfs as well as massive neutron stars. Key words: gravitational waves { (stars:) white dwarfs { stars: magnetic field { stars: neutron { stars: rotation 1 INTRODUCTION black hole of mass ∼ 62:2M . -
The Council and the Governing Board
The Council Ved Prakash, Secretary, and the Governing Board University Grants Commission, New Delhi. S. G. Rajasekaran, The Council The Institute of Mathematical Sciences, Chennai. President V. S. Ramamurthy, Secretary to the Government of India, A.S. Nigavekar, Department of Science and Technology, New Delhi. Chairperson, University Grants Commission, New Delhi. C.V. Vishveshwara, Honorary Director, Vice-President Jawaharlal Nehru Planetarium, Bangalore. V.N. Rajasekharan Pillai, The following members have served in the Council for Vice-Chairperson, part of the year University Grants Commission, New Delhi. Arnab Rai Choudhuri, Members Indian Institute of Science, Bangalore. N. Mukunda, S. S. Dattagupta, [Chairperson, Governing Board], Director, Satyendra Nath Bose National Centre Centre for Theoretical Studies, for Basic Sciences, Kolkata. Indian Institute of Science, Bangalore. Deepak Dhar, Shishir K. Dube, Tata Institute of Fundamental Research, Mumbai. Director, Indian Institute of Technology, Kharagpur. G.K. Mehta, Vice-Chancellor, Ashok Kumar Gupta, University of Allahabad. J.K. Institute of Applied Physics, University of Allahabad. Janak Pandey, Vice-Chancellor, Kota Harinarayana, University of Allahabad. Vice-Chancellor, University of Hyderabad. R.R. Pandey, Vice-Chancellor, A.K. Kembhavi, Deendayal Upadhyay Gorakhpur University. IUCAA, Pune. S. R. Rajaraman, A.S. Kolaskar, School of Physical Sciences, Vice-Chancellor, Jawaharlal Nehru University, New Delhi. University of Pune. Nityananda Saha, R.A. Mashelkar, Vice-Chancellor, Director General, University of Kalyani. Council of Scientific and Industrial Research, New Delhi. S.S. Suryawanshi, Vice-Chancellor, G. Madhavan Nair, Swami Ramanand Teerth Marathwada Secretary to the Government of India, University, Nanded. Department of Space, Bangalore. J.A.K. Tareen, Rajaram Nityananda, Vice-Chancellor, Centre Director, University of Kashmir, Srinagar. -
5.1 Project Name: Performance Based Resource Management and Load Balancing in Cloud. 5.1.1 Contributing Faculty Members 5.1.2 S
SELF APPRAISAL REPORT SUBGROUP : MOBILE & INNOVATIVE COMPUTING 5.1 Project Name: Performance based Resource Management and Load balancing in Cloud. 5.1.1 Contributing Faculty Members Name : Dr. Sarbani Roy Department/School : Computer Science and Engineering Journal Publications Number : 11 Journals +1 Book Chapter Conference Publications Number : 48 Patents Number : Nil Policy Documents Number : Nil H Index Number : 7 ( http://scholar.google.com/citations?hl=en&user=vembv2sAAAAJ) Cumulative Impact Factor Number : Total Citations Number : 150 ( http://scholar.google.com/citations?hl=en&user=vembv2sAAAAJ) Awarded and ongoing doctoral thesis guidance Number: 3 ongoing Awarded and ongoing Masters thesis guidance Number : 23 awarded 5.1.2 Special Achievements Name : Sarbani Roy Name of the award: 1. Awarded and availed Fulbright-Nehru Senior Research Fellowship 2012-2013. 2. Awarded UGC RAMAN Postdoctoral Fellowship 2012-2013 (not availed). 3. Awarded cLink (with the support of Erasmus Mundus Programme of the European Union) Postdoctoral Fellowship 2012-2013 (not availed). 5.1.3 Relevant Projects in Last 10 years including the Ongoing Projects 1. Working as a Principal Investigator of Project Title: Performance based Resource Management and Load balancing in Cloud Environment, Sponsor: under the project “Mobile Computing and Innovative Applications” under UPE - Phase II, 2012-2015. 2. Worked as a co-investigator of NRDMS project entitled “Development of an Integrated Web Portal for Healthcare Management based on Sensor-grid Technologies“, under School of Mobile computing & Communication, Jadavpur University, India, 2011-2014. 3. Worked as a co-investigator of UGC project entitled “Monitoring Air Pollution Using GIS and Sensor Technology “, under department of Computer Science and Engineering, Jadavpur University, India, 2011-2013. -
Indian Institute of Astrophysics
INDIAN INSTITUTE OF ASTROPHYSICS ACADEMIC REPORT 2006–07 EDITED BY : S. K. SAHA EDITORIAL ASSISTANCE : SANDRA RAJIVA Front Cover : High Altitude Gamma Ray (HAGAR) Telescope Array Back Cover (outer) : A collage of various telescopes at IIA field stations Back Cover (inner) : Participants of the second in-house meeting held at IIA, Bangalore Printed at : Vykat Prints Pvt. Ltd., Airport Road Cross, Bangalore 560 017 CONTENTS Governing Council 4. Experimental Astronomy 35 Honorary Fellows 4.1 High resolution astronomy 35 The year in review 4.2 Space astronomy 36 1. Sun and solar systems 1 4.3 Laboratory physics 37 1.1 Solar physics 1 5. Telescopes and Observatories 39 1.2 Solar radio astronomy 8 5.1 Kodaikanal Observatory 39 1.3 Planetary sciences 9 5.2 Vainu Bappu Observatory, Kavalur 39 1.4 Solar-terrestrial relationship 10 5.3 Indian Astronomical Observatory, 2. Stellar and Galactic Astronomy 12 Hanle 40 2.1 Star formation 12 5.4 CREST, Hosakote 43 2.2 Young stellar objects 12 5.5 Radio Telescope, Gauribidanur 43 2.3 Hydrogen deficient stars 13 6. Activities at the Bangalore Campus 45 2.4 Fluorine in evolved stars 14 6.1 Electronics laboratory 45 2.5 Stellar parameters 15 6.2 Photonics laboratory 46 2.6 Cepheids 15 6.3 Mechanical engineering division 47 2.7 Metal-poor stars 16 6.4 Civil engineering division 47 2.8 Stellar survey 16 6.5 Computer centre 47 2.9 Binary system 17 6.6 Library 47 2.10 Star cluster 17 7. Board of Graduate Studies 49 2.11 ISM 18 8. -
Diffusive Instability in a Prey-Predator System with Time-Dependent Diffusivity
IJMMS 2003:66, 4195–4203 PII. S0161171203207274 http://ijmms.hindawi.com © Hindawi Publishing Corp. DIFFUSIVE INSTABILITY IN A PREY-PREDATOR SYSTEM WITH TIME-DEPENDENT DIFFUSIVITY RAKHI BHATTACHARYYA, BANIBRATA MUKHOPADHYAY, and MALAY BANDYOPADHYAY Received 20 July 2002 An ecological model for prey-predator planktonic species has been considered, in which the growth of prey has been assumed to follow a Holling type II function. The model consists of two reaction-diffusion equations and we extend it to time- varying diffusivity for plankton population. A comparative study of local stability in case of constant diffusivity and time varying diffusivity has been performed. It has been found that the system would be more stable with time varying diffusivity depending upon the values of system parameter. 2000 Mathematics Subject Classification: 37G15. 1. Introduction. In 1952, Turing [10] proposed a diffusion-reaction theory of morphogenesis on the basis of well-known laws of physical chemistry. This concept has been extended to develop the theory of biological pattern for- mation. In an ecological context, Segel and Jackson [8] were the first to ap- ply Turing’s model to predator-prey system. Since then, diffusive instability has been playing an important role in the study of ecosystem [4, 5, 6]. In the above-mentioned studies, the considered system parameters are all time- independent and the ratio of diffusivities of predator and prey beyond a criti- cal value determines the diffusive instability of the system. In case of oceanic diffusion, the diffusivities can vary with time. Horizontal currents in the sea depend upon the depth of the sea. -
Arxiv:1912.00900V3 [Gr-Qc] 13 Jan 2021 at a New Mass-Limit ∼ 2.6M , Explaining a Possible Origin of Over-Luminous Peculiar Type Ia Supernovae
January 14, 2021 1:37 WSPC/INSTRUCTION FILE IJMPD2 International Journal of Modern Physics D © World Scientific Publishing Company Significantly super-Chandrasekhar mass-limit of white dwarfs in noncommutative geometry Surajit Kalita Department of Physics, Indian Institute of Science, Bangalore 560012, India [email protected] Banibrata Mukhopadhyay Department of Physics, Indian Institute of Science, Bangalore 560012, India [email protected] T. R. Govindarajan The Institute of Mathematical Sciences, Chennai 600113, India Chennai Mathematical Institute, Kelambakkam, Chennai 603103, India [email protected], [email protected] Received Day Month Year Revised Day Month Year Chandrasekhar made the startling discovery about nine decades back that the mass of compact object white dwarf has a limiting value, once nuclear fusion reactions stop therein. This is the Chandrasekhar mass-limit, which is ∼ 1:4M for a non-rotating non-magnetized white dwarf. On approaching this limiting mass, a white dwarf is be- lieved to spark off with an explosion called type Ia supernova, which is considered to be a standard candle. However, observations of several over-luminous, peculiar type Ia supernovae indicate that the Chandrasekhar mass-limit to be significantly larger. By considering noncommutativity among the components of position and momentum vari- ables, hence uncertainty in their measurements, at the quantum scales, we show that the mass of white dwarfs could be significantly super-Chandrasekhar and thereby arrive arXiv:1912.00900v3 [gr-qc] 13 Jan 2021 at a new mass-limit ∼ 2:6M , explaining a possible origin of over-luminous peculiar type Ia supernovae. The idea of noncommutativity, apart from the Heisenberg's uncer- tainty principle, is there for quite sometime, without any observational proof however.