Geometric flows and black hole entropy (2007)
Samuel, J., Chowdhury, Sutirtha Roy
Restricted Access.
Surface tension and the cosmological constant (2006)
One of the few predictions from quantum gravity models is Sorkin's observation that the cosmological constant has quantum fluctuations originating in the fundamental discreteness of spacetime at the...
Comparison of acute toxicities of two chemotherapy schedules for head and neck cancers (2006)
Geeta, S, Padmanabhan, T, Samuel, J, Pavithran, K, Iyer, S, Kuriakose, M
DNA elasticity: topology of self-avoidance (2006)
Samuel, J., Sinha, Supurna, Ghosh, Abhijit
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Euler buckling-induced folding and rotation of red blood cells in an optical trap (2006)
Ghosh, Abhijit, Sinha, Supurna, Dharmadhikari, J.A., Roy, S., Dharmadhikari, A.K., Samuel, J., ...
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Hariharan, P., Samuel, J., Sinha, Supurna
Bell's theorem reveals contradictions between the predictions of quantum mechanics and the EPR postulates for a pair of particles only in situations involving imperfect statistical correlations....
Novel IL-6 haplotypes and disease association (2005)
Fife, M.S., Ogilvie, E.M., Kelberman, D., Samuel, J., Gutierrez, A., Humphries, S.E., ...
Interleukin-6 (IL-6) is a pleiotropic cytokine crucial in both adaptive and innate immunity. Numerous genetic studies have shown association with variants of this gene in a multitude of diseases and...
Of connections and fields - II. Chern's mathematical ideas in physics (2005)
In the first part of this article we gave an elementary introduction to Chern's ideas and their impact on modern physics. In this concluding article we describe some more advanced applications of...
Of connections and fields - I. Chern's mathematical ideas in physics (2005)
We describe some instances of the appearance of Chern's mathematical ideas in physics. By means of simple examples, we bring out the geometric and topological ideas which have found application in...
Inequivalence of statistical ensembles in single molecule measurements (2005)
We study the role of fluctuations in single molecule experimental measurements of force-extension (f-zeta) curves. We use the wormlike chain (WLC) model to bring out the connection between the...
Euler buckling in red blood cells: An optically driven biological micromotor (2005)
Ghosh, A., Sinha, Supurna, Dharmadhikari, J. A., Roy, S., Dharmadhikari, A. K., Samuel, J., ...
We investigate the physics of an optically-driven micromotor of biological origin. A single, live red blood cell, when placed in an optical trap folds into a rod-like shape. If the trapping laser...
ANALYSIS OF AN APERTURE ANTENNA SYSTEM LOADED WITH AN INHOMOGENEOUS DIELECTRIC. (2005)
An analysis is made of an aperture system loaded with an inhomogeneous dielectric. The system consists of two parts. The first part is a section of rectangular waveguide extending from negative...
In this paper we investigate the propagation of long-term climate variabilities and climate changes through a catchment system to the flood frequency curve, through the use of a rainfall-runoff model...
Samuel, J., Sivapalan, M., Franks, Stewart William
In this paper we investigate the propagation of long-term climate variabilities and climate changes through a catchment system to the flood frequency curve, through the use of a rainfall-runoff model...
Measuring the general relativistic curvature of wavefronts (2004)
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
Molecular elasticity and the geometric phase (2003)
We present a method for solving the wormlike-chain (WLC) model for twisting semiflexible polymers to any desired accuracy. We show that the WLC free energy is a periodic function of the applied twist...
Elasticity of semiflexible polymers (2002)
We present a method for solving the wormlike chain model for semiflexible polymers to any desired accuracy over the entire range of polymer lengths. Our results are in excellent agreement with recent...
Hidden symmetries in deformed microwave resonators (2002)
We explain the “hidden symmetries” observed in wave functions of deformed microwave resonators in recent experiments. We also predict that other such symmetries can be seen in microwave...
Topological phases near a triple degeneracy (2001)
We study the pattern of three-state topological phases that appears in systems with real Hamiltonians and wave functions. We give a simple geometric construction for representing these phases. We...
Comment on "Immirzi parameter in quantum general relativity" (2001)
The Immirzi parameter is a free parameter which appears in the physical predictions of loop quantum gravity and is sometimes viewed as a quantization ambiguity. Interpretations have been offered for...
Comment on Holst’s Lagrangian formulation (2001)
We make two observations about Holst’s derivation of Barbero’s Hamiltonian formulation from a covariant Lagrangian. While Holst’s derivation does appear to be correct, there are two points in...
Is Barbero's Hamiltonian formulation a gauge theory of Lorentzian gravity? (2000)
Restricted Access.
Brownian motion on a sphere: distribution of solid angles (2000)
Krishna, M.M.G., Samuel, J., Sinha, Supurna
Restricted Access.
Transport along null curves (2000)
Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
The amoral scientists - The tragedy of Hiroshima (2000)
Murthy, M.V.N., Shankar, R., Rao, Madan, Samuel, J., Sitaram, Alladi
Hariharan, P., Samuel, J., Sinha, Supurna
Restricted Access.
The report reviews the observed topologic and geometric properties of natural channel networks, and compares them with predictions derived from assumptions of random topology and random link lengths....
Statistical Geometric Similarity in Drainage Networks. (1998)
The most commonly used quantitative parameters for characterizing channel networks are those derived from a Horton analysis. Although these parameters give useful information about individual...
Joint Distribution Functions for Link Lengths and Drainage Areas. (1998)
The elementary link lengths, l, and associated drainage areas, a, in drainage basins may be considered as correlated random variables drawn from a bivariate population. A theoretical model for the...
The coaxial cable - how cable TV operators use the Laplacian operator (1997)
This article illustrates the interplay between topology and analysis in the context of an everyday example. We describe how topology governs the trans- mission of TV signals through a cable. This...
The geometric phase and ray space isometries (1997)
We study the behaviour of the geometric phase under isometries of the ray space. This leads to a better understanding of a theorem first proved by Wigner: isometries of the ray space can always be...
Thomas rotation and polarized light: A non-abelian geometric phase in optics (1997)
We describe a non-abelian Berry phase in polarization optics, suggested by an analogy due to Nityananda between boosts in special relativity and the effect of elliptic dichroism on polarized light....
The Pancharatnam phase as a strictly geometric phase: A demonstration using pure projections (1997)
Hariharan, P., Ramachandran, Hema, Suresh, K.A., Samuel, J.
Restricted Access.
Poincare sphere representation for three state systems (1996)
We point out that the Poincare sphere can be used to represent the rays of a three state quantum system. Those interested in geometric phase phenomena may find this representation a useful aid to...
Merons and Thomas precession (1996)
In a recent study of Thomas precession of electron spin in the context of the Dirac equation, Shankar and Mathur identify the non-Abelian Berry potential (arising from Kramers degeneracy) with the...
Brownian motion and magnetism (1994)
We present an interesting connection between Brownian motion and magnetism. We use this to determine the distribution of areas enclosed by the path of a particle diffusing on a sphere. In addition,...
The Aharonov-Bohm effect (1994)
Quantum mechanics teaches us that matter consists of waves. Interference of matter waves gives rise to delicate effects best illustrated by the double slit experiment. Aharonov and Bohm showed that...
Comment on ``Meaning of the Wave Function'' (1994)
We draw attention to an elementary flaw in a recently proposed experiment to measure the wave function of a single quantum system.
Fractional spin from gravity (1993)
Friedman and Sorkin have observed that the total angular momentum of an asymptotically flat, vacuum, quantum gravitational field in 3+1 dimensions need not be integral. We pursue this idea in the...
Fermat's principle in general relativity (1992)
Kovner has observed that Fermat's principle can be used to describe the motion of light rays in arbitrary gravitational fields, not just stationary ones. We give a simple demonstration of this fact.
Bianchi cosmologies: the role of spatial topology (1991)
Restricted Access.
2+1 quantum gravity as a toy model for the 3+1 theory (1989)
Ashtekar, A., Husain, V., Rovelli, C., Samuel, J., Smolin, L.
Restricted Access.
Duality and conformal structure (1989)
Dray, T., Kulkarni, Ravi, Samuel, J.
In four dimensions, two metrics that are conformally related define the same Hodge dual operator on the space of two-forms. The converse, namely, that two metrics that have the same Hodge dual are...
General setting for Berry's phase (1988)
Open Access. Reprinted in La Fase di Berry - Ed. Franco Salmistraro. Universita degli Studi di Pavia, p89,1994
Observation of topological phase by use of a laser interferometer. (1988)
Open Access. Reprinted in Selected papers on interference, interferometry and interferometric metrology. Ed. P Hariharan & D Malacara. Vol. MS110 in Milestones in Optics. SPIE, 1995
Comment on `Spinning cosmic strings and quantization of energy' (1987)
A Comment on the Letter by P. O. Mazur, Phys. Rev. Lett. 57, 929 (1986).
Classical models for Regge trajectories (1987)
Biedenharn, L.C., Van Dam, H., Marmo, G., Morandi, G., Mukunda, N., Samuel, J., ...
Restricted Access.
A Lagrangian basis for Ashtekar's reformulation of canonical gravity (1987)
A manifestly covariant Lagrangian is presented which leads to the reformulation of canonical general relativity using new variables recently discovered by Ashtekar.
Classical models for Regge trajectories (1987)
Biedenharn, LC, Van Dam, H, Marmo, G, Morandi, G, Mukunda, N, Samuel, J, ...
Classical and quantum theory of extended objects, or particles with internal degrees of freedom,played an important role in physics in the last two decades spurred mainly by the goal of understanding...
Classical models for Regge trajectories (1987)
Biedenharn, LC, Van Dam, H, Marmo, G, Morandi, G, Mukunda, N, Samuel, J, ...
Classical and quantum theory of extended objects, or particles with internal degrees of freedom,played an important role in physics in the last two decades spurred mainly by the goal of understanding...
A gravitational analog of the Dirac monopole (1986)
We present an exact analogy between rotation in stationary geometries and magnetic fields based on a natural decomposition of spacetime into space and time in the spirit of Kaluza-Klein theories....
We present a detailed comparison of two models for relativistic classical particle interactions recently discussed in the literature-one based on independent particle variables, and the other on...
The effect of muscle protein on nonheme iron bioavailability /--by J. Samuel Godber. (1984)
Typescript.
Vita.
Comment on “the question of an upper bound on entropy” (1983)
Restricted Access.
Dynamics and symmetry for constrained systems:a geometrical analysis (1983)
Marmo, G, Mukunda, N, Samuel, J
This is a very interesting and well-written expository paper on the Hamiltonian formulation for constrained systems and its symmetry from the geometrical point of view. Coordinate-free and...
Dynamics and symmetry for constrained systems: a geometrical analysis (1983)
Marmo, G., Mukunda, N., Samuel, J.
Restricted Access.
Dynamics and symmetry for constrained systems:a geometrical analysis (1983)
Marmo, G, Mukunda, N, Samuel, J
This is a very interesting and well-written expository paper on the Hamiltonian formulation for constrained systems and its symmetry from the geometrical point of view. Coordinate-free and...
Includes vita and abstract.
Corrélation angulaire (d, pγ) dans la réaction9Be(d, p) 10Be (1960)
Gorodetzky, S., Samuel, J., Gallmann, A.
En vue de vérifier les prédictions de la théorie des ondes distordues dans les réactions de stripping, nous avons entrepris de mesurer la corrélation angulaire 9Be(d, pγ) 10Be dans le plan...
Courbes d'excitation de certains rayonnements γ dans la réaction 12C(d, p) 13C (1960)
Gorodetzky, S., Gallmann, A., Fintz, P., Samuel, J.
Les intensités des rayonnements γ de désexcitation des trois premiers niveaux excités de 13C vers le niveau fondamental ont été mesurées dans la réaction 12C(d, p)13C entre Ed = 1,2 et...
Corrélation angulaire (d, pγ) dans la réaction9Be(d, p) 10Be (1960)
Gorodetzky, S., Samuel, J., Gallmann, A.
En vue de vérifier les prédictions de la théorie des ondes distordues dans les réactions de stripping, nous avons entrepris de mesurer la corrélation angulaire 9Be(d, pγ) 10Be dans le plan...
Courbes d'excitation de certains rayonnements γ dans la réaction 12C(d, p) 13C (1960)
Gorodetzky, S., Gallmann, A., Fintz, P., Samuel, J.
Les intensités des rayonnements γ de désexcitation des trois premiers niveaux excités de 13C vers le niveau fondamental ont été mesurées dans la réaction 12C(d, p)13C entre Ed = 1,2 et...
Corrélation angulaire (d, pγ) dans la réaction9Be(d, p) 10Be (1960)
Gorodetzky, S., Samuel, J., Gallmann, A.
En vue de vérifier les prédictions de la théorie des ondes distordues dans les réactions de stripping, nous avons entrepris de mesurer la corrélation angulaire 9Be(d, pγ) 10Be dans le plan...
Courbes d'excitation de certains rayonnements γ dans la réaction 12C(d, p) 13C (1960)
Gorodetzky, S., Gallmann, A., Fintz, P., Samuel, J.
Les intensités des rayonnements γ de désexcitation des trois premiers niveaux excités de 13C vers le niveau fondamental ont été mesurées dans la réaction 12C(d, p)13C entre Ed = 1,2 et...
Pharmacokinetics and metabolism of E-5-(2-[131I]iodovinyl)-2'-deoxyuridine in dogs.
Samuel, J, Gill, M J, Iwashina, T, Tovell, D R, Tyrrell, D L, Knaus, E E, ...
E-5-(2-Iodovinyl)-2'-deoxyuridine (IVdU) is a potent inhibitor of herpes simplex virus type 1 replication in vitro. The selective antiviral activity of IVdU is due to preferential phosphorylation by...
Gill, M J, Samuel, J, Wiebe, L I, Knaus, E E, Tyrrell, D L
We have synthesized a 131I-radiolabeled antiviral compound (E)-5-(2-iodovinyl)-2'-deoxyuridine (IVdU) and shown that this agent was selectively trapped within rabbit kidney cells, infected in vitro...
Pharmacokinetics and metabolism of E-5-(2-[131I]iodovinyl)-2'-deoxyuridine in dogs.
Samuel, J, Gill, M J, Iwashina, T, Tovell, D R, Tyrrell, D L, Knaus, E E, ...
E-5-(2-Iodovinyl)-2'-deoxyuridine (IVdU) is a potent inhibitor of herpes simplex virus type 1 replication in vitro. The selective antiviral activity of IVdU is due to preferential phosphorylation by...
Gill, M J, Samuel, J, Wiebe, L I, Knaus, E E, Tyrrell, D L
We have synthesized a 131I-radiolabeled antiviral compound (E)-5-(2-iodovinyl)-2'-deoxyuridine (IVdU) and shown that this agent was selectively trapped within rabbit kidney cells, infected in vitro...