A Fourier-transform-based interferometric technique for measuring the elastic anisotropy of a nematic liquid crystal

The forces that arise between two iron particles in a nematic liquid crystal with a strong homeotropic anchoring were studied. For the first time, the short range repulsive force resulting from the presence of a hedgehog defect between two particles was precisely determined thanks to application of a small magnetic field and observation of the equilibrium position resulting from the balance between the elastic and magnetic forces. Above a given threshold force, the particles stuck together whereas the hedgehog defect was expelled and transformed into a Saturn ring located between the particles. The attractive part of the interparticle force was determined with the same method on the entire range of separation distances; we found that the equilibrium distance between two particles was r = 1.19 +/- 0.05 ( was the average diameter of the pair of particles).

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Probing the Anisotropic Expansion History of the Universe With Cosmic Microwave Background

Mohapatra

Saumia

Srivastava

2012

Int. J. Mod. Phys. A

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We propose a simple technique to detect any anisotropic expansion stage in the history of the universe starting from the inflationary stage to the surface of last scattering from the cosmic microwave background radiation (CMBR) data. We use the property that any anisotropic expansion in the universe would deform the shapes of the primordial density perturbations and this deformation can be detected in a shape analysis of superhorizon fluctuations in CMBR. Using this analysis we obtain the constraint on any previous anisotropic expansion of the universe to be less than about 35%.

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A Fourier-transform-based interferometric technique for measuring the elastic anisotropy of a nematic liquid crystal

Cited by 4 publications

References 9 publications

Nonlinear infrared optical measurements of elastic constants in nematic liquid crystal

Nonlinear infrared optical measurements of elastic constants in nematic liquid crystal

Measurement of Elastic Forces between Iron Colloidal Particles in a Nematic Liquid Crystal

Probing the Anisotropic Expansion History of the Universe With Cosmic Microwave Background

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