67,796 research outputs found
Gauged Clockwork Theory
We consider the gauged clockwork theory with a product of multiple
gauge groups and discuss the continuum limit of the theory to a massless gauged
with linear dilaton background in five dimensions. The localization of
the lightest state of gauge fields on a site in the theory space naturally
leads to exponentially small effective couplings of external matter fields
localized away from the site. We discuss the implications of our general
discussion with some examples, such as mediators of dark matter interactions,
flavor-changing -meson decays as well as D-term SUSY breaking.Comment: 22 pages, 2 figures, Expanded discussion on dark matter mediator, To
be published in Physics Letters
Softness of Supersymmetry Breaking on the Orbifold
We consider supersymmetry breaking due to a Scherk-Schwarz twist or localized
mass terms in 6d supersymmetric gauge theory compactified on the
orbifold . We show that the Scherk-Schwarz breaking in 6d is
equivalent to the localized breaking with mass terms along the lines in extra
dimensions. In the presence of the considered supersymmetry breaking, we find
that there arises a finite one-loop mass correction to a brane scalar due to
the KK modes of bulk gauge fields.Comment: JHEP style file of 16 pages, no figures, published versio
The novel E3 ligase of PPAR?? TRIM25 regulates adipocyte differentiation
Department of Biological SciencesPeroxisome proliferator-activated receptor ?? (PPAR??) is a ligand-dependent transcription factor which regulates glucose homeostasis and adipocyte differentiation. Its transcriptional activity is regulated by not only ligands but also post-translational modifications (PTMs). In this study, we demonstrate a novel E3 ligase of PPAR??, TRIM25 directly induces ubiquitination of PPAR?? followed by proteasome-dependent degradation. During the adipocyte differentiation, both mRNA and protein expression of TRIM25 significantly decreased and negatively correlated with the expression of PPAR??. Stable expression of TRIM25 reduces PPAR?? protein levels, but not mRNA expression, and suppressed adipocyte differentiation in 3T3-L1 cells. In contrast, specific knock-down of TRIM25 increases PPAR?? protein levels and stimulates adipocyte differentiation. Furthermore, TRIM25 knock-out mouse embryonic fibroblast (MEFs) shows an increased ability for adipocyte differentiation compared with wild-type MEFs. Taken together, these data indicate that TRIM25 is a novel E3 ubiquitin ligase of PPAR??, and depict TRIM25 as a novel target for PPAR??-involved metabolic diseases.ope
Gauge Coupling Unification in a 6D SO(10) Orbifold GUT
We consider the gauge coupling running in a six-dimensional SO(10) orbifold
GUT model. The bulk gauge symmetry is broken down to the standard model gauge
group with an extra U(1)_X by orbifold boundary conditions and the extra U(1)_X
is further broken through the U(1)_{B-L} breaking with bulk hyper multiplets.
We obtain the corrections of Kaluza-Klein massive modes to the running of the
gauge couplings and discuss their implication to the successful gauge coupling
unification.Comment: 10 pages, 2 figures, version to appear in Physics Letters
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