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After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also… (More)

We calculate analytically and numerically the production of superheavy dark matter (X) when it is coupled to the inflaton field φ within the context of a slow-roll mφφ /2 inflationary model with coupling gXφ/2. We find that X particles with a mass as large as 1000 Hi, where Hi is the value of the Hubble expansion rate at the end of inflation, can be… (More)

There is no known fundamental reason to demand as a cosmological initial condition that the bulk possess an SO(3, 1) isometry. On the contrary, one expects bulk curvature terms that violate the SO(3, 1) isometry at early epochs, leading to a violation of Lorentz invariance on our brane. Demanding that the Lorentz noninvariant terms are small leads to a new… (More)

We consider the cosmology that results if our observable universe is a 3-brane in a higher dimensional universe. In particular, we focus on the case where our 3-brane is located at the Z2 symmetry fixed plane of a Z2 symmetric five-dimensional spacetime, as in the Hořava-Witten model compactified on a Calabi-Yau manifold. As our first result, we find that… (More)

We show that, contrary to the standard lore, dark matter may be superheavy (many orders of magnitude larger than the weak scale). We show that massive particles may be produced naturally during the transition from the inflationary phase to either a matter-dominated or radiation-dominated phase as a result of the expansion of the background spacetime acting… (More)

We consider a scenario in which our observable universe is a 3-dimensional surface (3-brane) living in extra dimensions with a warped geometry. We show that “lensed” density perturbations from other branes serve as possible seeds for structure formation on our observable brane (without inflation), and, in addition, provide constraints on braneworld… (More)

- Michal Brhlik, Daniel J. H. Chung, Gordon L. Kane
- 2008

Suppose the lightest superpartner (LSP) is observed at colliders, and WIMPs are detected in explicit experiments. We point out that one cannot immediately conclude that cold dark matter (CDM) of the universe has been observed, and we determine what measurements are necessary before such a conclusion is meaningful. We discuss the analogous situation for… (More)

- Daniel J. H. Chung, Björn Garbrecht, Michael J. Ramsey-Musolf, Sean Tulin
- Physical review letters
- 2009

We analyze the quantum transport equations for supersymmetric electroweak baryogenesis including previously neglected bottom and tau Yukawa interactions and show that they imply the presence of a previously unrecognized dependence of the cosmic baryon asymmetry on the spectrum of third generation quark and lepton superpartners. For fixed values of the… (More)

Density perturbations generated from inflation almost always have a spectral index ns which runs (varies with the wavelength). We explore a running spectral index scenario in which the scalar spectral index runs from blue (ns > 1) on large length scales to red (ns < 1) on short length scales. Specifically, we look for a correlation between the length scale… (More)

- Daniel Choi, Hyun O Jin, Daniel J. H. Chung, Kaichiro Sasa, Takahisa Koike
- Trees
- 2008

To evaluate the effect of ectomycorrhizal colonization on growth and physiological activity of Larix kaempferi seedlings grown under soil acidification, we grew L. kaempferi seedlings with three types of ectomycorrhizae for 180 days in acidified brown forest soil derived from granite. The soil had been treated with an acid solution (0 (control), 10, 30, 60,… (More)