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32 papers · 1 filter
Dynamics of a Pair of Interacting Spins Coupled to an Environmental Sea
M. Dube, P. C. E. Stamp
We solve for the dynamics of a pair of spins, coupled to each other and also to an environmental sea of oscillators. The environment mediates an indirect interaction between the sp…
New constraints on R-parity violation from μ-e conversion in nuclei
K. Huitu, J. Maalampi, M. Raidal +1
We derive new constraints on the products of explicitly R-parity violating couplings and in MSSM from searches for μ-e conversion in nuclei. We concentrate on the loop ind…
Sum rules in the superpartner spectrum of the minimal supersymmetric standard model
Yoshiharu Kawamura, Tatsuo Kobayashi Jisuke Kubo
Assuming that the string inspired, universal sum rules for soft supersymmetry-breaking terms, which have been recently found both in a wide class of four-dimensional superstrings a…
The case for a cosmological constant
Matts Roos, S. M. Harun-or-Rashid
Taking the Hubble constant to be in the range 60 - 75 km/s Mpc we show that three independent conditions strongly rule out the standard model of flat space with vanishing cosmologi…
Lattice Approximation of Quantum Statistical Traces at a Complex Temperature
Jani Lukkarinen
We prove that the simple condition on the potential V, \int exp(-t V) < \infty for all t>0, is sufficient for the lattice approximation of the trace Tr[A exp(-b H)] with (Re b)>0 t…
An open systems approach to calculating time dependent spectra
Martti Havukainen, Stig Stenholm
A new method to calculate the spectrum using cascaded open systems and master equations is presented. The method uses two state analyzer atoms which are coupled to the system of in…