Sonia Paban

Constraints on the Baryogenesis Scale from Neutrino Masses

Over the past few years it has been realized1 that at temperatures above ~m w/αw transitions that violate baryon (B) and lepton (L) number occur rapidly since, due to the electroweak anomaly, these quantum numbers are not conserved. Indeed,

Constraints from extended supersymmetry in quantum mechanics

\begin{array}{*{20}{c}} {{\partial _\mu }j_\mu ^B = \frac{{g_2^2}}{{32{\pi ^2}}}{n_f}(\frac{1}{3}x3)F_{\mu v}^a\tilde F_a^{\mu v}} \\ {{\partial _\mu }j_\mu ^L = \frac{{g_2^2}}{{32{\pi ^2}}}{n_f}F_{\mu v}^a\tilde F_a^{\mu v}} \\ {{\partial _\mu }j_\mu ^{B - L} = 0.} \end{array}

Evidence for winding states in noncommutative quantum field theory

Recent astronomical observations indicate that the universe is accelerating. We argue that generic quintessence models that accommodate the present day acceleration tend to accelerate eternally. As a consequence the resulting spacetimes exhibit event horizons. Hence, quintessence poses the same problems for string theory as asymptotic de Sitter spaces.Recent astronomical observations indicate that the universe is acceler- ating. We argue that generic quintessence models that accomodate the present day acceleration tend to accelerate eternally. As a consequence the resulting spacetimes exhibit event horizons. Hence, quintessence poses the same problems for string theory as asymptotic de Sitter spaces.

Bounds on microscopic physics from P and T violation in atoms and molecules

Abstract We consider quantum mechanical gauge theories with sixteen supersymmetries. The Hamiltonians or Lagrangians characterizing these theories can contain higher derivative terms. In the operator approach, we show that the free theory is essentially the unique abelian theory with up to four derivatives in the following sense: any small deformation of the free theory, which preserves the supersymmetries, can be gauged away by a unitary conjugation. We also present a method for deriving constraints on terms appearing in an effective Lagrangian. We apply this method to the effective Lagrangian describing the dynamics of two well-separated clusters of D0-branes. As a result, we prove a non-renormalization theorem for the ν 4 interaction.

Electric dipole moment of electron

The idea that asymptotic de Sitter space can be described by a finite Hilbert Space implies that any quantum measurement has an irreducible innacuracy. We argue that this prevents any measurement from verifying the existence of the Poincare recurrences that occur in the mathematical formulation of quantum de Sitter (dS) space. It also implies that the mathematical quantum theory of dS space is not unique. There will be many different hamiltonians, which give the same results, within the uncertainty in all possible measurements.

CP violation from three-gluon operators in the supersymmetric standard model

Higher derivative terms in the effective action of certain Yang-Mills theories can be severely constrained by supersymmetry. We show that requiring sixteen supersymmetries in quantum mechanical gauge theory determines the v6 term in the effective action. Even the numerical coefficient of the v6 term is fixed in terms of lower derivative terms in the effective action.

Non-Gaussianity from excited initial inflationary states

We study noncommutative field theories at finite temperature to learn more about the degrees of freedom in the non-planar sector of these systems. We find evidence for winding states. At temperatures for which the thermal wavelength is smaller than the noncommutativity scale, there is a drastic reduction of the degrees of freedom in the non-planar sector. In this regime, the non-planar sector has thermodynamics resembling that of a 1+1 dimensional field theory.