Moduli, modulini and the gravitino have gravitational-strength interactions, and thermal collisions after reheating create all of them with roughly the same abundance. With their mass of order 100GeV, corresponding to gravity-mediated supersymmetry breaking, this leads to the well-known bound γTR ∼ < 10 GeV on the reheat temperature, where γ ≤ 1 is the entropy dilution factor. The vacuum fluctu...

We prove a finite volume lower bound of the order √ logN on the delocalization of a disordered continuous spin model (resp. effective interface model) in d = 2 in a box of size N . The interaction is assumed to be massless, possibly anharmonic and dominated from above by a Gaussian. Disorder is entering via a linear source term. For this model delocalization with the same rate is proved to take...

We prove a finite volume lower bound of the order √ logN on the delocalization of a disordered continuous spin model (resp. effective interface model) in d = 2 in a box of size N . The interaction is assumed to be massless, possibly anharmonic and dominated from above by a Gaussian. Disorder is entering via a linear source term. For this model delocalization with the same rate is proved to take...

In spite of the considerable efforts to explain the experimental Raman spectra of cuprate superconductors, the A1g superconducting response is not yet completely understood. It has been shown that the theoretical description of the A1g Raman response was very sensitive to small changes in the Raman vertex harmonic representations, yielding peak positions varying between ∆ and 2∆ [1]. However, t...

We study the relationship between bipartite entanglement, subsystem particle number and topology in a half-filled free fermion system. It is proposed that the spin-projected particle numbers can distinguish the quantum spin Hall state from other states, and can be used to establish a new topological index for the system. Furthermore, we apply the new topological invariant to disordered system a...

Theory of spin fluctuations as developed in the past 30 years have played important roles in the theory of magnetism in metals, particularly in elucidating the properties around the magnetic instability or quantum critical points. Recently the theory has been extended to deal with the spin fluctuaion-mediated superconductivity with anisotropic order parameters in strongly correlated electron sy...

Contributions to the quark flavor and spin observables from the intrinsic charm in the proton are discussed in the SU(4) quark meson fluctuation model. Our results suggest that the probability of finding the intrinsic charm in the proton is less than 1%. The intrinsic charm helicity is small and negative, ∆c ≃ −(0.003 ∼ 0.015). The fraction of the total quark helicity carried by the intrinsic c...

Magnetic and superconducting ground states can compete, cooperate and coexist. MnP provides a compelling and potentially generalizable example of a material where superconductivity and magnetism may be intertwined. Using a synchrotron-based non-resonant X-ray magnetic diffraction technique, we reveal a spiral spin order in MnP and trace its pressure evolution towards superconducting order via m...

For m bosons, carrying spin (f = 1 2 ) degree of freedom, in Ω single particle levels which are doubly degenerate, one-plus two-body Embedded Gaussian Orthogonal random matrix Ensemble which conserves spin (F ) [BEGOE(1 + 2)-F ] is defined and spectral properties are examined. Using mean field defined by random single particle energies, for fixed-(m,F ) BEGOE(1 + 2)-F , density of states being ...

A magnetoelectronic device is proposed in which a spin-current pulse produces a rapid reversal of the magnetization of a thin film nanomagnet. A spin-transfer torque induces the reversal and the switching speed is determined by the precession frequency of the magnetization in a thin film element’s demagnetization field. Micromagnetic simulations show that this switching occurs above a threshold...