31370057
Conformal transformation of the one-loop effective action for lambda phi4 theory.
The conformal transformation law for the one-loop effective action for the conformally invariant lambdaphi/sup 4/ theory is derived by using an argument due to Dowker. This result is used to compute the conformal transformation law for the variance of the quantum fluctuations around a background field.
118836746
Parity violating gravitational response and anomalous constitutive relations
A bstractWe compute the parity violating part of the time-dependent gravitational response function of an ideal gas of Weyl fermions up to third order in the derivative expansion and give its full tensorial structure. Our main results are two functions that parametrize the energy-momentum tensor in terms of gauge-invariant combinations of vector and tensor metric perturbations. The zero frequency limit of these functions is related with the anomalous constitutive relations and with the full anomalous partition function in the presence of gauge and mixed anomalies. In particular, our results imply the existence of a previously unknown invariant contribution to the parity-odd partition function at third derivative order that we explicitly construct. Beyond the static limit, the gravitational response function may provide valuable insights into time-dependent phenomena driven by anomalies.
118727763
Hamiltonian formulation of the effective kinetic theory for superfluid Fermi liquids
Abstract We present in a local form the time dependent effective description of a superfluid Fermi liquid which includes Landau damping effects at T ≠ 0 . This is achieved by the introduction of an additional variable, the quasiparticle distribution function, which obeys a simple kinetic equation. The transport equation is coupled with first order equations for the Goldstone mode and the particle density. We prove that a main feature of this formulation is its Hamiltonian structure relative to a certain Poisson bracket. We construct the Hamiltonian to quadratic order.
18877350
Renormalization-group method for simple operator problems in quantum mechanics
The failure of conventional perturbation theory due to secularity is considered with renormalization-group tecniques in two operator problems. Specifically, some results concerning the quantum anharmonic oscillator and quantum parametric resonance are obtained with a rather modest effort in comparison to other methods.
122197769
Symmetry breaking in de Sitter spacetime by antipodal symmetric and antisymmetric fields
Abstract The symmetry behaviour of a ϵo 4 model in the identified de Sitter space is considered. The different boundary conditions imposed on the quantum field correspond to antipodally symmetric and antisymmetric cases. For both cases, the variance of the quantum fluctuations around a constant background field is evaluated using a result on the conformal transformation of the effective action.
119103163
Hydrodynamics in 1+1 dimensions with gravitational anomalies
A bstractThe constraints imposed on hydrodynamics by the structure of gauge and gravitational anomalies are studied in two dimensions. By explicit integration of the consistent gravitational anomaly, we derive the equilibrium partition function at second derivative order. This partition function is then used to compute the parity-violating part of the covariant energy-momentum tensor and the transport coefficients.
26432778
Supersymmetric majoron signatures and solar neutrino oscillations.
Spontaneous R-parity breaking in supergravity solves the solar neutrino problem through matter-enhanced neutrino oscillations. The model may be tested in collider experiments and through ''dynamical'' effects associated with the existence of a weakly interacting majoron. Apart from astrophysical effects, majoron emission can produce observable changes in ..mu.. and tau decay spectra for parameter values that substantially reduce the solar neutrino flux. A signature of the model is the possible observation of the decay ..mu -->..e+majoron.
16036250
Dynamical left-right symmetry breaking.
We study a left–right symmetric model which contains only elementary gauge boson and fermion fields and no scalars. The phenomenologically required symmetry breaking emerges dynamically leading to a composite Higgs sector with a renormalizable effective Lagrangian. We discuss the pattern of symmetry breaking and phenomenological consequences of this scenario. It is shown that a viable top quark mass can be achieved for the ratio of the VEVs of the bi–doublet tan β ≡ κ/κ ′ ≃ 1.3–4. For a theoretically plausible choice of the parameters the right–handed scale can be as low as ∼ 20 T eV ; in this case one expects several intermediate and low–scale scalars in addition to the Standard Model Higgs boson. These may lead to observable lepton flavour violation effects including � → eγ decay with the rate close to its present experimental upper bound.
12453573
Resonant conversion of massless neutrinos in supernovae.
It has been noted for a long time that, in some circumstances, massless neutrinos may be mixed in the leptonic charged current. Conventional neutrino oscillation searches in vacuum are insensitive to this mixing. We discuss the effects of resonant massless-neutrino conversions in the dense ! 