Bulk Higgs field in a Randall-Sundrum model with nonvanishing brane cosmological constant (2009)
Dey, Paramita, Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We consider the possibility of Higgs mechanism in the bulk in a generalised Randall-Sundrum model, where a nonvanishing cosmological constant is induced on the visible brane. This scenario has the...
Koley, Ratna, Mitra, Joydip, Pal, Supratik, SenGupta, Soumitra
Thermodynamic properties of Schwarzschild-Anti de-Sitter (Sch-AdS) and Reissner-Nordstr\"om-Anti de-Sitter (RN-AdS) blackholes in 3+1 dimensional spacetime are studied critically with special...
Tunneling across dilaton-axion black holes (2009)
Ghosh, Tanwi, SenGupta, Soumitra
In this work we study both charged and uncharged particles tunneling across the horizon of spherically symmetric dilaton-axion black holes using Parikh-Wilczek tunneling formalism. Such black hole...
Kaluza-Klein modes of bulk fields in a generalized Randall-Sundrum scenario (2009)
Mitra, Joydip, SenGupta, Soumitra
We consider a generalised two brane Randall-Sundrum model with non-zero cosmological constant on the visible TeV brane. Massive Kaluza-Klein modes for various bulk fields namely graviton, gauge field...
Dey, Paramita, Mukhopadhyaya, Biswarup, SenGupta, Soumitra
The Randall-Sundrum model of warped geometry in a five-dimensional scenario, aimed at explaining the hierarchy between the Planck and electroweak scales, is intrinsically unstable in its minimal form...
A Randall-Sundrum scenario with bulk dilaton and torsion (2009)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider a string-inspired torsion-dilaton-gravity action in a Randall-Sundrum brane world scenario and show that, in an effective four-dimensional theory on the visible brane, the rank-2...
Aspects of warped braneworld models (2008)
We review various key issues in connection with the warped braneworld models which provide us with new insights and explanations of physical phenomena through interesting geometrical features of such...
Thermodynamics Of dilaton-axion black holes (2008)
Ghosh, Tanwi, SenGupta, Soumitra
Considering a generalised action for Einstein Maxwell theory in four dimensions coupled to scalar and pseudo-scalar fields, the thermodynamic properties of asymptotically flat black holes solutions...
Modulus stabilization of generalized Randall Sundrum model with bulk scalar field (2008)
Koley, Ratna, Mitra, Joydip, SenGupta, Soumitra
We study the stabilization of inter-brane spacing modulus of generalized warped brane models with a nonzero brane cosmological constant. Employing Goldberger-Wise stabilization prescription of brane...
Entropy of charged dilaton-axion black hole (2008)
Ghosh, Tanwi, SenGupta, Soumitra
Using brick wall method the entropy of charged dilaton-axion black hole is determined for both asymptotically flat and non-flat cases. The entropy turns out to be proportional to the horizon area of...
Fermion localization in generalised Randall Sundrum model (2008)
Koley, Ratna, Mitra, Joydip, SenGupta, Soumitra
A generalized two-brane Randall-Sundrum warped braneworld model admits of solutions of the warp factor for both positive or negative cosmological constant on the visible 3-brane which can resolve the...
Stable two--brane models with bulk tachyon matter (2008)
Das, A., Kar, Sayan, SenGupta, Soumitra
We explore the possibility of constructing stable, warped two--brane models which solve the heirarchy problem, with a bulk non--canonical scalar field (tachyon matter) as the source term in the...
Chiral fermions in a spacetime with multiple warping (2008)
Koley, Ratna, Mitra, Joydip, SenGupta, Soumitra
In a six dimensional brane world model with multiple $S_1/Z_2$ warping, two of the 4-branes at the boundaries have coordinate dependent brane tensions in order to implement the orbifolded boundary...
Soumitra Sengupta, Er Dupuy, Jed Schwartz, Ouri Wolfson, Yechiam Yemini
The Network Management, Analysis, and Testing Environment (NetMATE) project addresses research as well as pragmatic issues related to distributed network management of large, heterogeneous networks....
Das, Saurya, Maity, Debaprasad, SenGupta, Soumitra
We consider a generalized Randall Sundrum (RS) brane world scenario with a cosmological constant $\Omega$ induced on the visible brane. We show that for $\Omega0$. However, in this case, the...
Fermion mass splitting, stability and naturalness problems in warped braneworld models (2007)
We generalize the Randall Sundrum warped braneworld model in six and higher dimension and propose a resolution to the mass hierarchy among the standard model fermions. The fine tuning problem in...
Constraining the Randall-Sundrum modulus in the light of recent PVLAS data (2007)
Maity, Debaprasad, Roy, Sourov, SenGupta, Soumitra
Recent PVLAS data put stringent constraints on the measurement of birefringence and dichroism of electromagnetic waves travelling in a constant and homogeneous magnetic field. There have been...
Bulk antisymmetric tensor fields in a Randall-Sundrum model (2007)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider bulk antisymmetric tensor fields of various ranks in a Randall-Sundrum scenario. We show that, rank-2 onwards, the zero-modes of the projections of these fields on the (3+1) dimensional...
Slowly Rotating Dilaton Black hole In Anti-de Sitter Spacetime (2007)
Ghosh, Tanwi, SenGupta, Soumitra
Rotating dilaton black hole solution for asymptotically anti-de Sitter spacetime are obtained in the small angular momentum limit with an appropriate combination of three Liouville-type dilaton...
Stability and hierarchy problems in string inspired braneworld scenarios (2007)
Das, Saurya, Dey, Anindya, SenGupta, Soumitra
We generalise the RS braneworld model by taking into account a general stringy bulk containing the scalar dilaton field and the two-form Kalb-Ramond field, apart from gravity. Assuming small...
Living on the edge in a spacetime with multiple warping (2006)
Choudhury, Debajyoti, SenGupta, Soumitra
The Randall-Sundrum warped braneworld model is generalised to six and higher dimensions such that the warping has a non-trivial dependence on more than one dimension. This naturally leads to a...
A Critical Analysis of Goldberger-Wise Stabilization in Randall-Sundrum Scenario (2006)
Dey, Anindya, Maity, Debaprasad, SenGupta, Soumitra
The Goldberger-Wise mechanism of stabilizing modulus in the Randall-Sundrum braneworld,by introducing a bulk scalar field with quartic interaction terms localized at the 3-branes has been extremely...
The Raychaudhuri equations: a brief review (2006)
Kar, Sayan, SenGupta, Soumitra
We present a brief review on the Raychaudhuri equations. Beginning with a summary of the essential features of the original article by Raychaudhuri and subsequent work of numerous authors, we move on...
Randall-Sundrum with Kalb-Ramond field: return of the hierarchy problem? (2006)
Das, Saurya, Dey, Anindya, SenGupta, Soumitra
We show that when the antisymmetric Kalb-Ramond field is included in the Randall-Sundrum scenario, although the hierarchy problem can be solved, it requires an extreme fine tuning of the Kalb-Ramond...
Supergravity can reconcile dark matter with lepton number violating neutrino masses (2006)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra, Srikanth, Raghavendra
Supersymmetry offers a cold dark matter candidate, provided that lepton number is {\em not violated by an odd number of units}. On the other hand, lepton number violation by even (two) units gives us...
The role of higher derivative bulk scalar in stabilizing a warped spacetime (2006)
Maity, Debaprasad, SenGupta, Soumitra, Sur, Sourav
The backreaction on the Randall-Sundrum warped spacetime is determined in presence of scalar field in the bulk. A general analysis shows that the stability of such a model can be achieved only if the...
Stability analysis of the Randall-Sundrum braneworld in presence of bulk scalar (2006)
Maity, Debaprasad, SenGupta, Soumitra, Sur, Sourav
The stability problem of Randall-Sundrum braneworld is readdressed in the light of stabilizing bulk scalar fields. It is shown that in such scenario the instability persists because of back-reaction...
Das, Saurya, Dey, Anindya, SenGupta, Soumitra
We re-examine the fine tuning problem of the Higgs mass, when an antisymmetric two form Kalb-Ramond (KR) field is present in the bulk of a Randall-Sundrum (RS) braneworld. Taking into account the...
Charged black holes in generalized dilaton-axion gravity (2005)
Sur, Sourav, Das, Saurya, SenGupta, Soumitra
We study generic Einstein-Maxwell-Kalb-Ramond-dilaton actions, and derive conditions under which they give rise to static, spherically symmetric black hole solutions. We obtain new asymptotically...
Observable signals in a string inspired axion-dilaton background and Randall-Sundrum scenario (2005)
Maity, Debaprasad, SenGupta, Soumitra, Sur, Sourav
Rotation angle of the plane of polarization of the distant galactic radio waves has been estimated in a string inspired axion-dilaton background. It is found that the axion,dual to the field strength...
Split supersymmetry and the role of a light fermion in a supergravity-based scenario (2005)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We investigate split supersymmetry (SUSY) within a supergravity framework, where local SUSY is broken by the F-term of a hidden sector chiral superfield X. With reasonably general assumptions, we...
Spinning Test Particle in Kalb-Ramond background (2004)
Maity, Debaprasad, SenGupta, Soumitra, Sur, Sourav
In this work we explore the geodesic deviations of spinning test particles in a string inspired Einstein-Kalb Ramond background. Such a background is known to be equivalent to a spacetime geometry...
Sparticle spectrum and phenomenology in split supersymmetry: some possibilities (2004)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra
We investigate the split supersymmetry (SUSY) scenario recently proposed by Arkani-Hamed and Dimopoulos, where the scalars are heavy but the fermions are within the TeV range. We show that the...
Bulk Kalb-Ramond field in Randall Sundrum scenario (2004)
Mukhopadhyaya, Biswarup, Sen, Siddhartha, Sen, Somasri, SenGupta, Soumitra
We have considered the most general gauge invariant five-dimensional action of a second rank antisymmetric Kalb-Ramond tensor gauge theory, including a topological term of the form...
Parity-violating Kalb-Ramond-Maxwell interactions and CMB anisotropy in a braneworld (2004)
Maity, Debaprasad, Majumdar, Parthasarathi, SenGupta, Soumitra
Following up on a recent paper by two of us (DM and SS), demonstrating the large enhancement in observable optical activity in radiation from high redshift sources arising from the string-based...
Cosmic Optical Activity in a Randall-Sundrum Braneworld with Bulk Kalb-Ramond field (2003)
Maity, Debaprasad, SenGupta, Soumitra
Optical activity of electromagnetic waves in a string inspired Kalb-Ramond cosmological background is studied in presence of extra spacetime dimension. The Kalb-Ramond-electromagnetic coupling which...
Gravitational Redshift in Einstein-Kalb-Ramond Spacetime and Randall-Sundrum Scenario (2003)
SenGupta, Soumitra, Sur, Saurabh
It is shown that the gravitational redshift as predicted by Einstein's theory, is modified in presence of second rank antisymmetric tensor (Kalb-Ramond) field in a string inspired background...
Kar, Sayan, SenGupta, Soumitra, Sur, Saurabh
Static, spherically symmetric solutions of the Einstein--Kalb--Ramond (KR) field equations are obtained. Besides an earlier known exact solution, we also find an approximate, asymptotically flat...
Parity violation in four and higher dimensional spacetime with torsion (2002)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra, Sur, Saurabh
The possibility of parity violation in a gravitational theory with torsion is extensively explored in four and higher dimensions. In the former case,we have listed our conclusions on when and whether...
Does curvature-dilaton coupling with Kalb Ramond field lead to an accelerating Universe ? (2002)
SenGupta, Soumitra, Sur, Saurabh
In this work we show that the Universe evolving in a spacetime with torsion (originated from a second rank antisymmetric Kalb-Ramond field) and dilaton is free from any big bang singularity and can...
Does a Randall-Sundrum scenario create the illusion of a torsion-free universe? (2002)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We consider spacetime with torsion in a Randall-Sundrum (RS) scenario where torsion, identified with the rank-2 Kalb-Ramond field, exists in the bulk together with gravity. While the interactions of...
Bulk torsion fields in theories with large extra dimensions (2001)
Mukhopadhyaya, Biswarup, Sen, Somasri, SenGupta, Soumitra
We study the consequences of spacetime torsion coexisting with gravity in the bulk in scenarios with large extra dimensions. Having linked torsion with the Kalb-Ramond antisymmetric tensor field...
Generation of Neutrino mass in a Kalb-Ramond Background in large extra dimensions (2001)
SenGupta, Soumitra, Sinha, Aninda
In this paper we investigate whether spacetime torsion induced by a Kalb-Ramond field in a string inspired background can generate a mass for the left-handed neutrino. We consider an...
Cosmic optical activity from an inhomogeneous Kalb-Ramond field (2001)
Kar, Sayan, Majumdar, Parthasarathi, SenGupta, Soumitra, Sur, Saurabh
The effects of introducing a harmonic spatial inhomogeneity into the Kalb-Ramond field, interacting with the Maxwell field according to a `string-inspired' proposal made in earlier work are...
Spacetime torsion and parity violation: a gauge invariant formulation (2001)
Mukhopadhyaya, Biswarup, SenGupta, Soumitra, Sur, Saurabh
The possibility of parity violation through spacetime torsion has been explored in a scenario containing fields with different spins. Taking the Kalb-Ramond field as the source of torsion, an...
Spherically Symmetric Solutions of Gravitational Field Equations in Kalb-Ramond Background (2001)
SenGupta, Soumitra, Sur, Saurabh
Static spherically symmetric solution in a background spacetime with torsion is derived explicitly. The torsion considered here is identified with the field strength of a second rank antisymmetric...
Fermion helicity flip by parity violating torsion (2001)
SenGupta, Soumitra, Sinha, Aninda
The helicity flip of a spin-1/2 Dirac fermion interacting with a torsion- field endowed with a pseudo-tensorial extension is analysed. Taking the torsion to be represented by a Kalb-Ramond field, we...
Does a Kalb-Ramond field make spacetime optically active (2000)
Kar, Sayan, Majumdar, Parthasarathi, Sengupta, Soumitra, Sinha, Aninda
A spacetime with torsion produced by a Kalb-Ramond field coupled gravitationally to the Maxwell field, in accordance with a recent proposal by two of us (PM and SS), is argued to lead to an optical...
Parity Violating Gravitational Coupling Of Electromagnetic Fields (1999)
Majumdar, Parthasarathi, SenGupta, Soumitra
A manifestly gauge invariant formulation of the coupling of the Maxwell theory with an Einstein Cartan geometry is given, where the space time torsion originates from a massless Kalb-Ramond field...
A geometrical interpretation of parity violation in gravity with torsion (1998)
Mukhopadhyaya, Biswarup, Sengupta, Soumitra
In a space-time with torsion, the action for the gravitational field can be extended with a parity-violating piece. We show how to obtain such a piece from geometry itself, by suitably modifying the...
Gaugino mass in the Heterotic string with Scherk-Schwarz compactification (1998)
Majumdar, Parthasarathi, SenGupta, Soumitra
The generic observable sector gaugino mass in the weakly-coupled heterotic string compactified to four dimensions by the Scherk-Schwarz scheme (together with hidden sector gaugino condensation...
Duality Invariance of Cosmological Solutions with Torsion (1998)
Gangopadhyay, Debashis, Sengupta, Soumitra
We show that for a string moving in a background consisting of maximally symmetric gravity, dilaton field and second rank antisymmetric tensor field, the $O(d) \otimes O(d)$ transformation on the...
Construction of Maximally Symmetric Solutions for the Metric (1997)
Gangopadhyay, Debashis, Sengupta, Soumitra
We construct new maximally symmetric solutions for the metric. We then show that for a string moving in a background consisting of maximally symmetric gravity, dilaton field and second rank...
The Meaning of Maximal Symmetry in Presence of Torsion (1997)
Gangopadhyay, Debashis, Sengupta, Soumitra
We show that the usual physical meaning of maximal symmetry can be made to remain unaltered even if torsion is present. All that is required is that the torsion fields satisfy some mutually...
Generalising The Concept Of Maximal Symmetry Of Spacetimes In The Presence Of Torsion (1994)
Gangopadhyay, Debashis, Sengupta, Soumitra
A possible generalisation is given to the meaning of maximal symmetry in the presence of torsion
Divyakant Agrawal, Soumitra Sengupta
Abstract- A version control mechanism is proposed that enhances the modularity and extensibility of multiversion concurrency control algorithms. We decouple the multiversion algorithms into two...
Divyakant Agrawal, Soumitra Sengupta
Abstract-A version control mechanism is proposed that en-hances the modularity and extensibility of multiversion concur-rency control algorithms. We decouple the multiversion algo-rithms into two...
NETMATE: A Network Management Environment (1991)
Alexander Dupuy, Soumitra Sengupta, Ouri Wolfson, Yechiam Yemini
The Network Management, Analysis, and Testing Environment (NETMATE) project proposes the design and implementation of a comprehensive data model to address the problems in distributed network...
Design of the Netmate Network Management System (1991)
Alexander Dupuy, Er Dupuy, Soumitra Sengupta, Ouri Wolfson, Yechiam Yemini
The Network management, analysis, and testing environment (Netmate) project addresses research and experimental issues in distributed network management of large, heterogeneous networks. This paper...
Optimistic concurrency control for prolog databases /--by Soumitra Sengupta. (1987)
Thesis (Ph. D.)--State University of New York at Stony Brook, 1987.
Distributed optimistic concurrency control with reduced rollback (1987)
Divyakant Agrawal, Arthur J. Bernstein, Pankaj Gupta, Soumitra Sengupta
terests include design of algo-rithms for concurrent systems, optimistic protocols and distrib-uted systems. Arthur Bernstein is a Professor of Computer Science at the State
Starren, Justin, Hripcsak, George, Sengupta, Soumitra, Abbruscato, C.R., Knudson, Paul E., Weinstock, Ruth S., ...
The Columbia University Informatics for Diabetes Education and Telemedicine IDEATel) project is a four-year demonstration project funded by the Centers for Medicare and Medicaid Services with the...
Chen, Elizabeth S., Hripcsak, George, Patel, Vimla L., Sengupta, Soumitra, Gallagher, Richard J., Cimino, James J.
Starren, Justin, Hripcsak, George, Sengupta, Soumitra, Abbruscato, C.R., Knudson, Paul E., Weinstock, Ruth S., ...
The Columbia University Informatics for Diabetes Education and Telemedicine IDEATel) project is a four-year demonstration project funded by the Centers for Medicare and Medicaid Services with the...
Chen, Elizabeth S., Hripcsak, George, Patel, Vimla L., Sengupta, Soumitra, Gallagher, Richard J., Cimino, James J.
Emergency Department Access to a Longitudinal Medical Record
Hripcsak, George, Sengupta, Soumitra, Wilcox, Adam, Green, Robert A.
Our goal is to assess how clinical information from previous visits is used in the emergency department. We used detailed user audit logs to measure access to different data types. We found that...
An Audit Server for Monitoring Usage of Clinical Information Systems
Gallagher, Richard J., Sengupta, Soumitra, Hripcsak, George, Barrows, Randolph C., Clayton, Paul D.
The Token Ring Local Area Network: Implementation Considerations
Conklin, George S., Clayton, Paul D., Sengupta, Soumitra, Smith, Lorraine, McCormack, Megan, Subak-Sharpe, David, ...
Heterogeneity in Health Care Computing Environments
This paper discusses issues of heterogeneity in computer systems, networks, databases, and presentation techniques, and the problems it creates in developing integrated medical information systems....
A Model for Expanded Public Health Reporting in the Context of HIPAA
Sengupta, Soumitra, Calman, Neil S., Hripcsak, George
The advent of electronic medical records and health information exchange raise the possibility of expanding public health reporting to detect a broad range of clinical conditions and of monitoring...