Poster presentation (Last update on 12/5) Scheduled on 12/15

Eromanga Adermann
Title:Exploring the Cosmic Web in Alternative Cosmologies
Abstract:
Using state of the art numerical simulations, I will unravel the observational signatures ofseveral alternative cosmological models in the large scale structure of the cosmic web.
The key observational probe under study is evolution of cosmological voids, in particular
their size, distribution and growth, to provide us with clues to the underlying cosmology ofthe Universe. While the ultimate goal is to include galaxy formation recipes to determine
the true efficacy of using cosmic voids in realistic future surveys with next generation
telescopes, we will present the initial results of the void distribution in the redshift-zero
universe, showing that universes with an evolving and decaying dark sector have asignificant imprint on the void structure when compared to a vanilla Lambda-CDM
cosmology.
Weijian Wang
Title:Radiative Linear Seesaw, Dark Matter and B-L symmetry
Abstract:
We propose a radiated linear seesaw model where the naturally small term µL are
generated at one-loop level and its soft-breaking of lepton number symmetry attributes tothe spontaneous breaking(SSB) of B-L gauge symmetry. The value of B−L charges for
new particles are assigned to satisfy the anomalies cancelation. It is founded that somenew particles may have exotic values of B−L charge such that there exists residual Z2×Z′2symmetry even after SSB of B−L gauge symmetry. The Z2×Z′2 discrete symmetry
stabilizes the these particles as dark matter candidates. In the model, two no-interplay
classes of inert fermions and scalars are introduced, leading to two-component dark
matter candidates. The lepton flavor violation processes, the relic density of dark matter,the direct detection of dark matter and the phenomenology on collider machine areinvestigated.
Nobuhiro Maekawa
Title:Neutrino masses and mixings as signature of GUT and the impact to nucleon decay
Abstract:
First I will show that observed neutrino data give a signature of SU(5) GUT. Only anassumption in SU(5) GUT can explain various hierarchies of quark and lepton masses andmixings.
Next, I will emphasize that the E6 GUT is more attractive because the assumption can bederived in E6 GUT. Under the understanding the Yukawa structures, the ambiguities in
predicting the nucleon decay are reduced. I will show the detail calculation for the nucleon
decay, which can identify the unification group. Especially, I will show that the flavorchanging necleon decay such as p-&gt;mu+pi, whose signal has been found insuperKamiokande recently (2 events), implies larger rank of unification group, although thesignal is still consistent with the back ground (0.9 event).

Poster presentation (Last update on 12/5) Scheduled on 12/15

Seong Youl Choi
Title:Characterizing invisible electroweak particles through single-photon processes at highenergy $e^+e^-$ colliders
Abstract:
We explore the scenarios where the only accessible new states at the electroweak scaleconsist of a pair of color-singlet electroweak particles, whose masses are degenerate at
the tree level and split only by electroweak symmetry breaking at the loop level. Due to the
mass-degeneracy, those lower-lying electroweak states are difficult to observe at the LHC
and rather challenging to detect at the $e^+e^−$ collider as well. We exploit the pair
production in association with a hard photon radiation in high energy e+e− collisions. If
kinematically accessible, such single-photon processes at $e^+e^−$ colliders withpolarized beams enable us to characterize each scenario by measuring the energy andscattering angle of the associated hard photon, and to determine the spin of the nearlyinvisible particles unambiguously through the threshold behavior in the photon energy
distribution.
Erin Edkins Ludert
Title:DarkSide Direct Dark Matter Search with Underground Argon
Abstract:
We will present the recent results of the DarkSide-50 direct dark matter experiment using
low-radioactivity argon from underground sources as a detector medium, the first result
using such a target.? DarkSide-50 is a 50 kg (36.9 kg fiducial) Liquid Argon Time
Projection Chamber located inside a 30 t liquid scintillator neutron veto, which is in turnlocated inside a 1 kt water Cherenkov muon veto. The DarkSide experiment is housed
underground at the Laboratori Nazionali del Gran Sasso (LNGS).
The results of 70.9 live-days of data taking with underground argon?will be presented. This
represents the most sensitive search with an argon target to date.? Underground argon isshown to have strongly suppressed 39Ar activity, making it possible for multi-tonne-year
exposures to be free of this background. Plans for the 20 t detector will also be presented
Mikhail Katanaev
Title:On homogeneous and isotropic universe
Abstract:
We give a simple example of space-time metric, illustrating that homogeneity and isotropyof space slices at all moments of time is not obligatory lifted to a full system of six Killing
vector fields in space-time, thus it cannot be interpreted as a symmetry of a four
dimensional metric. The metric depends on two arbitrary and independent functions oftime. One of these functions is the usual scale factor. The second function cannot be
removed by coordinatetransformations. We prove that it must be equal to zero, if the metric satisfies
Einstein&#039;s equations and the matter energy momentum tensor is homogeneous andisotropic. A new, equivalent, definition of homogeneous and isotropic space-time is given.

Poster presentation (Last update on 12/5) Scheduled on 12/15

Ooba Junpei:
Title:Planck constraints on scalar-tensor cosmology and the variation of the gravitational
constant
Abstract:
We present cosmological constraints on the scalar-tensor theory of gravity using CMB
angular power spectrum data from Planck 2015 results. The model we consider is theharmonic attractor model, in which the scalar field has its harmonic potential with curvature($￥beta$) in the Einstein conformal frame and the theory relaxes toward the Einstein
gravity with time. The data contain {￥it TT}, {￥it EE}, {￥it TE} angular power spectra ofthe CMB and we carried out the data analysis to constrain the cosmological parameters by
the MCMC method. As a result, we find that the present deviation from the Einstein gravity(${￥alpha_0}^2$) is constrained as ${￥alpha_0}^2&lt;10^{-4-50￥beta^3}￥ (2￥sigma)$and ${￥alpha_0}^2&lt;3￥times10^{-4-50￥beta^3}￥ (4￥sigma)$ for $0&lt;￥beta&lt;
0.45$. The variation of the effective gravitational constant at the recombination epoch isconstrained as $G_{￥rm rec}/G_0&lt;1.0030￥ (2￥sigma)$ and $G_{￥rm rec}/G_0&lt;
1.0065￥ (4￥sigma)$. Our result shows that The deviation of the gravitational constant at
the recombination epoch from the today&#039;s value is smaller than 1￥%, it is verystrong constraint on the variation of the gravitational constant.
Peiwen Wu
Title:Scalar Dark Matter with a Vector-like Top Partner
Abstract:
We investigated the phenomenology of the extension of the SM with a singlet scalar (S)and a vector-like top partner (T) which has the same quantum number as the right-handed
top quark. By assuming a Z2 dark parity to the new particles, we have the scalar S acting
as the dark matter (DM) candidate. We studied the suitable parameter space consistent
with the observed DM relic density, vacuum stability as well as the current DM direct
detection experiments. For the production of a pair of T which later decay into DMs andthe top quark pair, we also discussed the possible constraints on the model from CMS
ttbar+MET measurement at 8 TeV.
Juan Carlos Gomez
Title:Breaking $mu- au$ symmetry through the ${ f Q}_{6}$ flavour group
Abstract:
In a supersymmetry scenario, we study masses and mixings for leptons through the ${ f Q}_{6}$ flavour symmetry. In the simplest case, the ${ f M}_{u}$ effective neutrino mass matrix, that comes from the type I see-saw mechanism, breaks
the $mu leftrightarrow
au$ interchange symmetry. As consequence, the reactor andatmospheric angles are deviated of $0^{circ}$ and $45^{circ}$, respectively. At first glance,
the model might accommodate very well the reactor and atmospheric angles in good
agreement with the experimental data.

Poster presentation (Last update on 12/5) Scheduled on 12/15

Shinsuki Asaba
Title:The effect of the supersonic relative motion between baryons and dark matter on thestructure formation
Abstract:
One of aims of upcoming radio interferometers such as Square Kilometre Array is anobserving small-scale structure via the 21-cm hyperfine structure line from neutralhydrogen atoms before the epoch of reionization. It is expected that this observables
contain a wealth of information about unresolved cosmological questions. On the other
hand, Tseliakhovich &amp; Hirata (2010) have pointed out the supersonic relative motion
between baryons and dark matter after the recombination suppresses abundances of thesmall mass halos. This suppression impacts succeeding first star or galaxy formations, thereionization history and galaxy distributions. The modeling of the suppression by thesupersonic streaming motion is desired for high precision cosmology by utilizing future
observations.
We have modeled the effect of the supersonic relative motion on the structure formation by
expanding the spherical collapse model. When the delay of the collapse time of dark
matter halo by the supersonic motion is converted into the change of the critical density inPress-Schechter formalism, we found that the suppression of the halo abundance at themass scale of 10^5M_odot reaches a half at z=10. We also compare the mass function
estimated from the Press-Schechter formalize to the result of the cosmological N-bodysimulation.
Shohei Okawa
Title:Form factor effects in a Higgs portal pionic dark matter model
Abstract:
It is an interesting possibility that dark matter interacts the SM particles only through theHiggs portal.
If we consider a QCD-like confining gauge theory in the hidden sector, the pseudo NambuGoldstone bosons arising from the spontaneous chiral symmetry breaking are the lightest
hadron-like particles in the hidden sector and can therefore be dark matter.
We call this dark matter candidates dark pions.
In this presentation, we will show that the portal interaction between the Higgs and thedark pions is related to scalar form factor of the dark pion and enhancement effects by thisform factor relax constraint on the dark matter mass.
Toshinori Matsui
Title:Gravitational waves as a probe of extended Higgs sectors with the first orderelectroweak phase transition
Abstract:
We discuss spectra of gravitational waves which are originated by the strongly first orderphase transition at the electroweak symmetry breaking, which is required for a successful
scenario of electroweak baryogenesis. Such spectra are numerically evaluated in a set ofPoster presentation (Last update on 12/5) Scheduled on 12/15

extended scalar sectors with additional N isospin-singlet fields as a concrete example ofrenormalizable theories. We show the produced gravitational waves can be significant, sothat they are detectable at future gravitational wave interferometers. Furthermore, weconclude that future detailed observation of gravitational waves can be generally useful asa probe of extended scalar sectors with the first order phase transition. This talk is basedon arXiv:1509.08394 [hep-ph], with M. Kakizaki and S. Kanemura.
Wataru Kuramoto
Title:Nucleon Electric Dipole Moments in High-Scale Supersymmetric Models
Abstract:
The electric dipole moments (EDMs) of electron and nucleons are promising probes of thenew physics. In generic high-scale supersymmetric (SUSY) scenarios such as models
based on mixture of the anomaly and gauge mediations, gluino has an additional
contribution to the nucleon EDMs. In this paper, we studied the effect of the CP-violating
gluon Weinberg operator induced by the gluino chromoelectric dipole moment in the highscale SUSY scenarios, and we evaluated the nucleon and electron EDMs in the scenarios.
We found that in the generic high-scale SUSY models, the nucleon EDMs may receive thesizable contribution from the Weinberg operator. Thus, it is important to compare thenucleon EDMs with the electron one in order to discriminate among the high-scale SUSYmodels.
Yoshihiro Kurosawa
Title:Asymmetric dark matter and effective number of neutrinos
Abstract:
We study the effect of the MeV-scale asymmetric dark matter annihilation on the effective
number of neutrinos $N_{m eff}$ at the epoch of the big bang nucleosynthesis. If theasymmetric dark matter $chi$ couples more strongly to the neutrinos $u$ than to the photons $gamma$ and electrons $e^-$, $Gamma_{chigamma, chi e} llGamma_{chi u}$, or $Gamma_{chigamma, chi e} gg Gamma_{chi u}$, the lower mass
limit on the asymmetric dark matter is about $18$ MeV for $N_{m eff}simeq 3.0$.
Shu-Yu Ho
Title:Exploring X-Ray Lines as Scotogenic Signals
Abstract:
We consider some implications of X-ray lines from certain astronomical objects aspotential effects of dark matter decay in the context of the scotogenic model, whereneutrinos acquire mass radiatively via one-loop interactions with dark matter. As anexample, we focus on the 3.5 keV line recently detected in the X-ray spectra of galaxy
clusters, assuming that it stands future scrutiny. We explore the scenario in which the line
originates from the slow decay of fermionic dark matter in the model. After obtaining a
number of benchmark points representing the parameter space consistent with the newdata and various other constraints, we make predictions on several observables in leptonic
processes. They include the effective Majorana mass in neutrinoless double-beta decay,

Poster presentation (Last update on 12/5) Scheduled on 12/15

the sum of neutrino masses, and the rate of flavor-changing decay mu -&gt; e gamma, aswell as the cross sections of e+e- collisions into final states containing nonstandard
particles in the model. These are testable in ongoing or future experiments and thus offer
means to probe the scotogenic scenario studied.
Daiki Yasuhara
Title:Contribution of right-handed neutrinos for reheting era leptogenesis
Abstract:
Recently, Y.Hamada and K.Kiyoharu suggest a novel leptogenesis scenario which requires
only higher dimensional operators in addition to the standard model. The lepton number
asymmetry can be produced by the scattering between the standard model particles.
In this study, I confirm that typical models with heavy right-handed neutrinos can derivenecesary higher dimensional operators and CP breaking phases and evaluate its size.