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107 papers · 1 filter
Critical behaviour in
S. Mukherjee, P. Raychaudhuri, A. K. Nigam
We have studied the critical behaviour in near the paramagnetic-ferromagnetic transition temperature. We have analysed our dc magnetisation data near the…
Triaxial projected shell model approach
J. A. Sheikh, K. Hara
The projected shell model analysis is carried out using the triaxial Nilsson+BCS basis. It is demonstrated that, for an accurate description of the moments of inertia in the transi…
Absence of local thermal equilibrium in two models of heat conduction
Abhishek Dhar, Deepak Dhar
A crucial assumption in the conventional description of thermal conduction is the existence of local thermal equilibrium. We test this assumption in two simple models of heat condu…
Competing Drifting Radio Subpulses in PSR B0031-07
M. Vivekanand, B. C. Joshi
The pair of drifting subpulses of the radio pulsar PSR B0031-07 appear to be well separated from each other on the average, overlapping at less than one thirtieth of the peak energ…
Measurement of the High-Mass Drell-Yan Cross Section and Limits on Quark-Electron Compositeness Scales
B. Abbott
We present a measurement of the Drell-Yan cross section at high dielectron invariant mass using 120/pb of data collected in pbar-p collisions at sqrt(s) = 1.8 TeV by the D0 collabo…
The magnetoresistance in GdNi: Magnetic-polaronic-like effect near Curie temperature and low temperature sign reversal
R. Mallik, E. V. Sampathkumaran, P. L. Paulose +1
The results of magnetoresistance ()measurements in GdNi, in the temperature range 4.2 to 300 K are reported. The sign of above the Curie temperature (Tc= 70 K) is nega…
Residual resistivity ratio and its relation to the positive magnetoresistance behavior in natural multilayer LaMn2Ge2; relevance to artificial multilayer physics
S. Majumdar, R. Mallik, E. V. Sampathkumaran +1
Results of low temperature magnetoresistance () and isothermal magnetization (M) measurements on polycrystalline ferromagnetic (T_C close to 300 K) natural multilayers, LaMn_…
Analytical results for random walk persistence
Clement Sire, Satya N. Majumdar, Andreas Rudinger
In this paper, we present the detailed calculation of the persistence exponent for a nearly-Markovian Gaussian process , a problem initially introduced in [Phys. Rev. Let…
Large extra dimensions and deep-inelastic scattering at HERA
Prakash Mathews, Sreerup Raychaudhuri, K. Sridhar
In scenarios motivated by string theories, it is possible to have extra Kaluza-Klein dimensions compactified to rather large magnitudes, leading to large effects of gravity at scal…
Double Asymptotic Scaling in Drell-Yan Processes
Rahul Basu, Sourendu Gupta
Double scaling may be observed in the Drell-Yan process at the Tevatron and in the ALICE detector at the Large Hadron Collider in a window of masses. In the double scaling limit of…
Superconducting Gap Anisotropy and Quasiparticle Interactions: a Doping Dependent ARPES Study
J. Mesot, M. R. Norman, H. Ding +11
Comparing ARPES measurements on Bi2212 with penetration depth data, we show that a description of the nodal excitations of the d-wave superconducting state in terms of non-interact…
The effect of the total density of states at Fermi level on spin polarised tunnelling in granular La0.55Ho0.15Sr0.3MnO3
P. Raychaudhuri, A. K. Nigam, R. Pinto +2
We study the spin polarised tunnelling mechanism through magnetisation and magnetoresistance in the granular polycrystalline colossal magnetoresistive manganite, La0.55Ho0.15Sr0.3M…
Large Low Temperature Magnetoresistance and Magnetic Anomalies in TbPdSi and DyPdSi
R. Mallik, E. V. Sampathkumaran, P. L. Paulose
The results of heat-capacity, magnetic susceptibility, electrical resistivity and magnetoresistance measurements on the compounds TbPdSi and DyPdSi, are re…
Observation of a temperature dependent electrical resistance minimum above the magnetic ordering temperature in GdPdSi
R. Mallik, E. V. Sampathkumaran, M. Strecker +1
Results on electrical resistivity, magnetoresistance, magnetic Results on electrical resistivity, magnetoresistance, magnetic susceptibility, heat capacity and Gd Mossbauer measure…
Transport and magnetic anomalies due to A-site ionic size mismatch in LaCaBa_{x}MnO
R. Mallik, E. S. Reddy, P. L. Paulose +2
We present results of electrical resistivity, magnetoresistance and ac and dc magnetic susceptibility on polycrystalline samples of the type La(0.5)Ca(0.5-x)Ba(x)MnO(3) synthesized…
A See-Saw Model for Atmospheric and Solar Neutrino Oscillations
Ernest Ma, D. P. Roy, Utpal Sarkar
We have constructed an explicit see-saw model containing two singlet neutrinos, one carrying a gauge charge with an intermediate mass scale of GeV alon…
Maximally Causal Quantum Mechanics
S. M. Roy
We present a new causal quantum mechanics in one and two dimensions developed recently at TIFR by this author and V. Singh. In this theory both position and momentum for a system p…
A Bound on Violations of Lorentz Invariance
R. Cowsik, B. V. Sreekantan
Recently Coleman and Glashow [1] have developed a model which allows the introduction of a small violation of Lorentz invariance. Observational signatures arise because this intera…
Dualities and the SL(2,Z) Anomaly
Sunil Mukhi
The SL(2,Z) anomaly recently derived for type IIB supergravity in 10 dimensions is shown to be a consequence of T-duality with the type IIA string, after compactification to 2 dime…
Correlations and Freezing in Steadily Settling Suspensions
Rangan Lahiri, Sriram Ramaswamy
We study the liquid-solid transition in a collection of interacting particles moving through a dissipative medium under the action of a constant, spatially uniform external force,…
Limit constructions over Riemann surfaces and their parameter spaces, and the commensurability group actions
Indranil Biswas, Subhashis Nag
To any compact hyperbolic Riemann surface , we associate a new type of automorphism group -- called its *commensurability automorphism group*, . The members of $ComAu…
Maximally Realistic Causal Quantum Mechanics
S. M. Roy, Virendra Singh
We recently constructed a causal quantum mechanics in 2 dim. phase space which is more realistic than the de Broglie-Bohm mechanics as it reproduces not just the position but also…
Monopoles and Solitons in Fuzzy Physics
S. Baez, A. P. Balachandran, S. Vaidya +1
Monopoles and solitons have important topological aspects like quantized fluxes, winding numbers and curved target spaces. Naive discretizations which substitute a lattice of point…
Brane Constructions, Conifolds and M-Theory
Keshav Dasgupta, Sunil Mukhi
We show that a set of parallel 3-brane probes near a conifold singularity can be mapped onto a configuration of intersecting branes in type IIA string theory. The field theory on t…