Pankaj Jain

The dynamical mixing of light and pseudoscalar fields

We solve the general problem of mixing of electromagnetic and scalar or pseudoscalar fields coupled by axion-type interactions Lint = gϕϕεμναβFμνFαβ. The problem depends on several dimensionful scales, including the magnitude and direction of background magnetic field, the pseudoscalar mass, plasma frequency, propagation frequency, wave number, and finally the pseudoscalar coupling. We apply the results to the first consistent calculations of the mixing of light propagating in a background magnetic field of varying directions, which show a great variety of fascinating resonant and polarization effects.

Uncovering the scaling laws of hard exclusive hadronic processes in a comprehensive endpoint model

We show that an endpoint-overlap model can explain the scaling laws observed in exclusive hadronic reactions at large momentum transfer. The model assumes one of the valence quarks carries most of the hadron momentum. Hadron form factors and fixed-angle scattering are related directly to the quark wave function, which can be directly extracted from experimental data. A universal linear endpoint behavior explains the proton electromagnetic form factor, proton–proton fixed-angle scattering, and the

Angular power spectrum of CMB anisotropy from WMAP

t

Probing Dark Energy with Light: Propagation and Spontaneous Polarization

t-dependence of proton–proton scattering at large

Bounds on Extended Godel-Type Metrics from Type Ia Supernova Data

s>>t

Large Scale Anisotropy due to Early Phase of Inflation

s>>t. Endpoint constituent counting rules relate the number of quarks in a hadron to the power-law behavior. All proton reactions surveyed are consistent with three quarks participating. The model is applicable at laboratory energies and does not need assumptions of asymptotically high energy regime. A rich phenomenology of lepton–hadron scattering and hadron–hadron scattering processes is found in remarkably simple relationships between diverse processes.