Enhanced Tau Lepton Signatures at LHC in Constrained Supersymmetric Seesaw (2009)
We discuss the possible enhancement of the tau lepton events at LHC when the left-handed stau doublet becomes light (which can be even lighter than the right-handed stau). This is illustrated in the...
Heavy Right-Handed Neutrinos and Dark Matter in the $\nu$CMSSM (2009)
Kadota, Kenji, Olive, Keith A.
We perform a systematic study of the effects of the type-I seesaw mechanism on the dark matter abundance in the constrained supersymmetric standard model (CMSSM) which includes three right-handed...
A Sneutrino NLSP in the $\nu$CMSSM (2009)
Kadota, Kenji, Olive, Keith A., Velasco-Sevilla, Liliana
We extend the constrained minimal supersymmetric model (CMSSM) by adding a right-handed neutrino superfield ($\nu$CMSSM) which decouples close to the GUT scale. We study the effects of a right-handed...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G, Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
CMBPol Mission Concept Study: Probing Inflation with CMB Polarization (2008)
Baumann, Daniel, Jackson, Mark G., Adshead, Peter, Amblard, Alexandre, Ashoorioon, Amjad, Bartolo, Nicola, ...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measurements to...
New D-term chaotic inflation in supergravity and leptogenesis (2008)
Kadota, Kenji, Kawano, Teruhiko, Yamaguchi, Masahide
We present a new model of D-term dominated chaotic inflation in supergravity. The F-flat direction present in this model is lifted by the dominant D-term, which leads to chaotic inflation and...
Sterile neutrino dark matter in warped extra dimensions (2007)
We consider a (long-lived) sterile neutrino dark matter scenario in a five dimensional (5D) warped extra dimension model where the fields can live in the bulk, which is partly motivated from the...
D-term chaotic inflation in supergravity (2007)
Kadota, Kenji, Yamaguchi, Masahide
Even though the chaotic inflation is one of the most popular inflation models for its simple dynamics and compelling resolutions to the initial condition problems, its realization in supergravity has...
Warped Leptogenesis with Dirac Neutrino Masses (2007)
Gherghetta, Tony, Kadota, Kenji, Yamaguchi, Masahide
We show how leptogenesis can occur at the TeV scale with neutrinos that possess almost purely Dirac masses and negligible Majorana mass contributions as a consequence of the small wavefunction...
The Decay of the Inflaton in No-scale Supergravity (2006)
Endo, Motoi, Kadota, Kenji, Olive, Keith A., Takahashi, Fuminobu, Yanagida, T. T.
We study the decay of the inflaton in no-scale supergravity and show that decay due to the gravitational interactions through supergravity effects is highly suppressed relative to the case in minimal...
Primordial non-Gaussianity and Dark Energy constraints from Cluster Surveys (2006)
Sefusatti, Emiliano, Vale, Chris, Kadota, Kenji, Frieman, Joshua
Galaxy cluster surveys will be a powerful probe of dark energy. At the same time, cluster abundance is sensitive to any non-Gaussianity of the primordial density field. It is therefore possible that...
D-term Inflation and Leptogenesis by Right-handed Sneutrino (2005)
We discuss a D-term inflation scenario where a right-handed sneutrino can be an inflaton field leading to a viable inflation and leptogenesis, with a minimal form of K\"ahler potential. The decay of...
Parameterizing the Power Spectrum: Beyond the Truncated Taylor Expansion (2005)
Abazajian, Kevork, Kadota, Kenji, Stewart, Ewan D.
The power spectrum is traditionally parameterized by a truncated Taylor series: $ln P(k) = ln P_* + (n_*-1) ln(k/k_*) + {1/2} n'_* ln^2(k/k_*)$. It is reasonable to truncate the Taylor series if...
Kadota, Kenji, Dodelson, Scott, Hu, Wayne, Stewart, Ewan D.
Through a principal component analysis, we study how accurately CMB observables can constrain inflaton potentials in a model independent manner. We apply the general slow-roll approximation in our...
Inflation model building in moduli space (2004)
Kadota, Kenji, Stewart, Ewan D.
A self-consistent modular cosmology scenario and its testability in view of future CMB experiments are discussed. Particular attention is drawn to the enhanced symmetric points in moduli space which...
Uncertainties in the S-Z selected cluster angular power spectrum (2004)
Large SZ selected galaxy cluster surveys are beginning imminently. We compare the dependence of the galaxy cluster angular power spectrum on cosmological parameters, different modeling assumptions...
Modular Cosmology, Thermal Inflation, Baryogenesis and Predictions for Particle Accelerators (2004)
Jeong, Donghui, Kadota, Kenji, Park, Wan-Il, Stewart, Ewan D.
Modular cosmology is plagued by overproduction of unwanted relics, gravitinos and especially moduli, at relatively low energy scales. Thermal inflation provides a compelling solution to this moduli...
Inflation on Moduli Space and Cosmic Perturbations (2003)
Kadota, Kenji, Stewart, Ewan D.
We show that a moduli space of the form predicted by string theory, lifted by supersymmetry breaking, gives rise to successful inflation for large regions of parameter space without any modification...
Successful Modular Cosmology (2003)
Kadota, Kenji, Stewart, Ewan D.
We present a modular cosmology scenario where the difficulties encountered in conventional modular cosmology are solved in a self-consistent manner, with definite predictions to be tested by...
Supergravity Inflation Free from Harmful Relics (2002)
Greene, Patrick B., Kadota, Kenji, Murayama, Hitoshi
We present a realistic supergravity inflation model which is free from the overproduction of potentially dangerous relics in cosmology, namely moduli and gravitinos which can lead to the...