Oral presentation (general slots) Last update on 12/5

Kazuharu Bamba
Title: Inflationary universe in a conformally-invariant two-scalar-field theory with an $R^2$
term
Abstract:
We investigate inflationary cosmology in a theory where there exist two scalar fields which
non-minimally couple to the Ricci scalar and an additional $R^2$ term, which breaks theconformal invariance. In particular, we explore the slow-roll inflation in the case of one
dynamical scalar field and that of two dynamical scalar fields. It is explicitly shown that the
spectral index of the curvature perturbations and the tensor-to-scalar ratio of the density
perturbations can be compatible with the recent Planck results. We also demonstrate thatthe graceful exit from inflation can be realized. Reference: K. Bamba, S. D. Odintsov andP. V. Tretyakov, Eur. Phys. J. C 75,344 (2015) [arXiv:1505.00854 [hep-th]].
Alvaro de la Cruz-Dombriz
Title: Limitations of cosmography in extended theories of gravity
Abstract:
Model-independent methods in cosmology have become an essential tool in order to deal
with an increasing number of theoretical alternatives for explaining the late-timeacceleration of the Universe. In principle, this provides a way of testing the Cosmological
Concordance model under different assumptions and to rule out whole classes ofcompeting theories. One such model-independent method is the so-called cosmographic
approach, which relies only in the homogeneity and isotropy of the Universe on large
scales. We show that this method suffers from many shortcomings, providing biased
results depending on the auxiliary variable used in the series expansion and is unable torule out models or adequately reconstruct theories with higher-order derivatives in either
the gravitational or matter sector. Consequently, in its present form, this method seems
unable to provide reliable or useful results for cosmological applications.
Alessandro Codello
Title: Covariant Effective Field Theory of Gravity
Abstract:
Using covariant methods we construct the effective field theory of gravity as a loop
expansion in inverse powers of the Planck mass, distinguishing classical, leading andnext-to-leading quantum corrections. We then compute the leading corrections in acurvature expansion to quadratic order. We specialize the effective action to FRW
spacetimes and we derive the related effective Friedmann equations.
We show that for particular values of the parameters we recover many different non-local
modifications of general relativity recently proposed that are able to describe both earlyand late time cosmology.
Tatsuo Kobayashi
Title: New forms of potential for string axion inflation

Oral presentation (general slots) Last update on 12/5

Abstract:
We discuss axion inflation within the framework of type IIB superstring theory. New forms
of inflation potential are derived. We also study their implications.
Kenji Kadota
Title: CMB probes on generally correlated axion isocurvature perturbations
Abstract:
We explore the possible cosmological consequence of the coupling between the inflaton
and axion-like fields. As concrete examples, we illustrate that there is a preference for the
existence of the correlated isocurvature modes for the axion monodromy inflation while thenatural inflation disfavors such isocurvature modes. We also show the sensitivity of theforthcoming CMB (lensing and polarization) data on such (scale-dependent) crosscorrelations and how the generally correlated isocurvature parameters can affect theestimation of the conventional Lambda CDM parameters.
Gaetano Lambiase
Title: f(R) cosmology and dark matter
Abstract:
The cosmic evolution of the Universe, as well as the thermal history of particles, ismodified with respect to the standard cosmology if the cosmological background is
described by f(R) theories. In this framework it is discussed the evolution of relics particles(WIMPs) and the connection to the PAMELA experiment.
Digesh Raut
Title: Running Non-Minimal Inflation with Stabilized Inflaton Potential
Abstract:
In the context of the Higgs model involving gauge and Yukawa interactions with the
spontaneous gauge symmetry breaking, we consider λ?4 inflation with non-minimal
gravitational coupling, where the Higgs field is identified as inflaton. Since the inflaton
quartic coupling is very small, once quantum corrections through the gauge and Yukawa
interactions are taken into account, the inflaton effective potential most likely becomes
unstable. In order to avoid this problem, we need to impose stability conditions on theeffective inflaton potential, which lead to not only non-trivial relations amongst the particle
mass spectrum of the model, but also correlations between the inflationary predictions andthe mass spectrum. For concrete discussion, we investigate the minimal B−L extension of
the Standard Model with identification of the B−L Higgs field as inflaton. The stability
conditions for the inflaton effective potential fix the mass ratio amongst the B−L gaugeboson, the right-handed neutrinos and the inflaton. This mass ratio also correlates with the
inflationary predictions. In other words, if the B−L gauge boson and the right-handed
neutrinos are discovered in future, their observed mass ratio provides constraints on the
inflationary predictions.

Oral presentation (general slots) Last update on 12/5

Kohei Kamada
Title: Standard Model Higgs in the Inflationary Universe
Abstract:
Recent results of collider physics suggests that the Standard Model Higgs potential ismetastable if there are no physics beyond the Standard Model. If it is really metastable,high scale inflation is problematic since the Standard Model Higgs is destabilized during
inflation and falls down to the unwanted true vacuum. Here I consider the nontrivial
interaction of the Standard Model Higgs to generate additional mass term for it during
inflation. I show that this helps for the our electroweak vacuum to be selected. Moreover, I
point out that the additional mass term does not have to be larger than the Hubble
parameter during inflation.
Carlotta Pittori
Title:Dark matter signatures in a mostly unexplored gamma-ray energy window
Abstract:
One of the major scientific objectives of gamma-ray instruments is the search for dark
matter (DM) by means of the production of secondary gamma-rays after the annihilation or
decay of the DM particle candidates.
The Galactic Center is still expected to be the brightest source of DM annihilations in the
gamma-ray sky by several orders of magnitude. Resolving the inner region of our Galaxy
in the MeV - GeV domain remains one of the outstanding problems of modern
astrophysics.
The energy range 0.3 MeV - 100 MeV between Compton and pair production regimes inparticular is unique for studying matter evolution, antimatter generation, very energetic
phenomena in compact objects and massive black holes, but it is notoriously difficult to
study.
It would require an efficient instrument working both in the Compton scattering regime
from 0.1 MeV up to about 15 MeV, and in the electron-positron pair production regime athigher energies, with excellent background subtraction capability.
Until now, instruments in this energy range lacked the sensitivity for a breakthrough.
The e-ASTROGAM Mission (M. Tavani, V. Tatischeff et al.) to be proposed to ESA M5 Callfor a Medium-size Mission will add the as yet unexplored MeV - GeV range to Dark Matter
investigations with excellent angular resolution and exposure. Models will be tested in a
spectral range not currently studied in order to disentangle the possible DM contribution
from the diffuse background, the point sources contribution and the other possible
explanations.
Hong-Bo Jin (Canceled)Title: Spectra of cosmic ray electrons and diffuse gamma rays with the constraints of
AMS-02 and HESS data
Abstract:
Recently, AMS-02 reported their observed results of cosmic rays(CRs). In addition to the
AMS-02 data, we add HESS data to estimate the spectra of CR electrons and the diffuse

Oral presentation (general slots) Last update on 12/5

gamma rays above TeV. In the conventional diffusion model, a global analysis is performedon the spectral features of CR electrons and the diffuse gamma rays by GALRPOP
package. The results show that the spectrum structure of the primary component of CR
electrons can not be fully reproduced by a simple power law and the relevant break isaround hundred GeV. The spectrum of CR electrons does not need to add TeV cutoff tomatch the features of HESS data too. Based on the difference between the fluxes of CR
electrons and the primary component of them, the predicted excess of CR positrons is
consistent with the interpretations as pulsar or dark matter. In the analysis of the Galactic
diffuse gamma rays with the indirect constraint of AMS-02 and HESS data, it is found thatthe fluxes of Galactic diffuse gamma rays are consistent with GeV data of Fermi-LAT in thehigh latitude regions. That strongly constrains the production of the gamma rays from theannihilation or decay of dark matter in the Galaxy.
Ki-Young Choi
Title:
Abstract:
The isocurvature perturbation of WIMP can be generated during the early matterdominated era at small scales. This mode is not erased during the kinetic decoupling andremains large enough to make a substantial contribution to the formation of small scale
structures.
I will talk about the generation of the isocurvature perturbation for the WIMP dark matterand the implications.
Yue-Lin Suming Tsai
Title: Searching for Singlet- Doublet Mixing Majorana DM
Abstract:
Dark Matter searching is usually model-dependent.
However, with simple assumptions, it is still possible to character DM from current DM
experimental data, including cosmology, DM direct detection, DM indirect detection, andcolliders. I will fist review our result for pure Singlet Majorana DM and then present our
updated result for Singlet- Doublet Mixing Majorana DM.
Tsuguo Aramaki (CDMS)
Title: Recent results from the second CDMSlite run and overview of the SuperCDMS
Abstract:
The CDMS low ionization threshold experiment (CDMSlite) uses Ge detectors operated ata relatively high bias voltage, where the enhanced phonon signal from the Neganov-Lukeeffect allows us to lower the energy threshold. The recent results of 70kg-days exposure in
the second CDMSlite run exclude new parameter space for low-mass dark matterparticles, in the dark matter mass range of 1.6 - 5.5 GeV. The SuperCDMS collaboration ismoving forward with the design and construction of the SuperCDMS SNOLAB project.
Overview of the project and our progress to date will also be presented.

Oral presentation (general slots) Last update on 12/5

Natsumi Nagata
Title: Probing gaugino coannihilation with displaced vertex searches
Abstract:
It has been widely known that bino-like dark matter in the supersymmetric theories ingeneral suffers from over-production. The situation can be drastically improved if anothergaugino has a mass slightly heavier than the bino dark matter as it reduces the dark
matter abundance through coannihilation. In this work, we consider such a bino-gaugino
coannihilation scenario in high-scale supersymmetric models and study the prospects for
exploring this bino-gaugino coannihilation scenario at the LHC. We show that searches forlong-lived particles with displaced vertices offer a strong tool to test this scenario in collider
experiments.
Feng Luo
Title: Gluino Coannihilation
Abstract:
Some variants of the minimal supersymmetric extension of the Standard Model (MSSM)
feature a strip in parameter space where the lightest neutralino is identified as the lightest
supersymmetric particle (LSP), the gluino is the next-to-lightest supersymmetric particle(NLSP) and is nearly degenerate with the LSP, and the relic cold dark matter density isbrought into the range allowed by astrophysics and cosmology by coannihilation with thegluino NLSP. We calculate the relic density along this gluino coannihilation strip in the
MSSM, including the effects of gluino-gluino bound states, and taking into account thedecoupling of the gluino and LSP densities that occurs for a squark to gluino mass ratio
larger than order of 100. We find that the LSP may weigh up to ~ 8 TeV with the correct
dark matter density.
Sang Hui Im
Title: Realizing the relaxion with multiple axions and its UV completion with high scale
supersymmetry
Abstract:
We discuss a scheme to implement the relaxion solution to the hierarchy problem withmultiple axions, and present a UV-completed model realizing the scheme.
All axions $phi_i$ (i=1, 2, ..., N) in our model are periodic with similar decay constants well
below the Planck scale. In the limit of a large number of axions N &gt;&gt; 1, the relation$phi$ corresponds to an exponentially long flat direction in the N-dimensional compact
field space of $phi_i$, which is shaped by a series of mass mixings between nearby
axions.
Those mass mixings cause a multiplicative helical windings of flat direction, yielding arelaxion field range $Delta phi$ = 2pi f_eff ~ 2pi n_1 n_2 ... n_{N-1} f, where the modeldependent integers n_i are all bigger than the unity.
Both the scalar potential driving the evolution of $phi$ during the inflationary epoch andthe $phi$-dependent Higgs boson mass vary with an exponentially large periodicity of O

Oral presentation (general slots) Last update on 12/5

(f_eff), while the back reaction potential stabilizing the relaxion has a periodicity of O(f). A
natural UV completion of our scheme can be found in high scale or (mini) split
supersymmetry (SUSY) scenario with the axion scales generated by SUSY breaking as
f_i ~ (m_{SUSY} M_*)^{1/2} where the soft SUSY breaking scalar mass m_{SUSY} is well
above the weak scale, but much lower than the fundamental scale M_* which may be
identified as the Planck scale or the GUT scale.
Takaaki Nomura
Title: SU(2)$_L \times$SU(2)$_R$ minimal dark matter with simplified Higgs sector
Abstract:
We construct the minimal dark matter models in the left-right symmetric extensions of thestandard model (SM), where the gauge symmetry SU(3)$_C\times$SU(2)$_L\times$SU(2)$_R\times$U(1)$_{B-L}$ is broken into its subgroup SU(3)$_C imes$U(1)$_{m em}$ by nonzero VEVs of a SU(2)$_R$ doublet $H_R$ and a SU(2)$_L\times$ SU(2)$_R$ bidoublet $H$. A possible candidate of dark matter is explored in the framework ofminimal dark matter considering SU(2)$_{L, R}$ multiplet scalar bosons and fermions.
Then we focus on SU(2)$_R$ quintuplet fermions with $B-L$ charges 0, 2 and 4 as theminimal dark matter candidates and investigate phenomenology of them. We show thatthe dark matter in the model can provide observed relic density with 2 TeV $W&#039;$
boson which is motivated by the ATLAS diboson excess and CMS $eejj$ excess. The
possible mass of dark matter is predicted for each $B-L$ charge. We then estimate thescattering cross section of dark matter with nucleon and production cross section of
charged components in the quintuplets at the LHC.
Kaori Fuyuto
Title: Aspects of CP violation in electroweak baryogenesis
Abstract:
We discuss the aspects of CP-violating effects on electroweak baryogensis in models
where an extra Higgs doublet, a singlet and electroweak-interacting fermions are added. It
is found that one CP-phase that directly relates the baryon asymmetry of the Universe(BAU) to the electric dipole moment (EDM) exists. Moreover, it is obtained that theparameter region for the successful BAU can be verified by the electron EDM in near
future.
Masato Yamanaka
Title: Leptogenesis in $E_6 \times U(1)_A$ SUSY GUT model
Abstract:
We study the thermal leptogenesis in the $E_6imes U(1)_A$ SUSY GUT model in which
realistic masses and mixings of quarks and leptons can be realized. We show that thesufficient baryon number can be produced by the leptogenesis in the model, in which themass parameter of the lightest right-handed neutrino is predicted to be smaller than
$10^8$ GeV. The essential point is that the mass of the lightest right-handed neutrino canbe enhanced in the model because it has a lot of mass terms whose mass parameters areOral presentation (general slots) Last update on 12/5

predicted to be the same order of magnitude which is smaller than $10^8$ GeV. We showthat O(10) enhancement for the lightest right-handed neutrino mass issufficient for the observed baryon asymmetry. Note that such mass enhancements do notchange the predictions of neutrino masses and mixings at the low energy scale in the$E_6$ model which has six right-handed neutrinos. In the calculation, we include theeffects of supersymmetry and flavor in final states of the right-handed neutrino decay. We
show that the effect of supersymmetry is quite important even in the strong washout
regime when the effect of flavor is included. This is because the washout effects on theasymmetries both of the muon and the electron become weaker than that of the tau
asymmetry.
Chiristoph Toennis (ANTARES)
Title: The indirect search for dark matter with the ANTARES neutrino telescope
Abstract:
The indirect search for dark matter is is amongst the utmost important topics in neutrino
telescopes. The ANTARES neutrino telescope has been installed on the bottom of theMediterranean Sea in 2007 and has been taken data since then. In this talk the results ofthe different analyses for dark matter signals from different potential sources producedwith different analysis methods will be presented. The specific advantages of neutrino
telescopes in general and of ANTARES in particular will be explained. In particular thelimits from the searches for dark matter annihilations in the Sun and the Galactic Center
currently are amongst the best for neutrino telescopes.
Joe Sato
Title: MeV scale leptonic force for cosmic neutrino spectrum and muon anomalous
Abstract:
Characteristic patterns of cosmic neutrino spectrum reported by the IceCube collaborationand long-standing inconsistency between theory and experiment in muon anomalous
magnetic moment are simultaneously explained by an extra leptonic force mediated by agauge field with a mass of the MeV scale. With different assumptions for redshift
distribution of cosmic neutrino sources, diffuse neutrino flux is calculated with thescattering between cosmic neutrino and cosmic neutrino background through the new
leptonic force. Our analysis sheds light on a relation among lepton physics at the threedifferent scales, PeV, MeV, and eV, and provides possible clues to the distribution ofsources of cosmic neutrino and also to neutrino mass spectrum.
Arman Esmaili Taklimi
Title: Interpreting the IceCube events by decaying dark matter: hints and constraints
Abstract:
The observed events by IceCube, notably the PeV cascades accompanied by events atlower energies, are clearly in excess over the background of atmospheric flux and beg foran astroparticle physics explanation. I will discuss the possibility to interpret the IceCube
data by PeV mass scale decaying Dark Matter. I discuss the generic signatures of thisOral presentation (general slots) Last update on 12/5

scenario, including its energy spectrum distortion with respect to the benchmark
expectation for astrophysical sources, as well as the peculiar anisotropies. A directcomparison with the data show a good match with the above-mentioned features. I further
discuss possible future checks of this scenario by EAS experiments, both by detecting theprompt gamma ray flux from decaying dark matter, or the induced anisotropies in thecosmic ray flux. Finally, I will discuss what we can learn about the properties of PeV-scale
dark matter if the observed high energy neutrinos originate from conventional
astrophysical sources.
Takashi Toma
Title: Self-interacting dark matter and monochromatic lines
Abstract:
We study the correlation between a monochromatic signal from annihilating dark matterand its self-interacting cross section. We apply our argument to a complex scalar dark
sector, where the pseudoscalar plays the role of a warm dark matter candidate while thescalar mediates its interaction with the Standard Model. We combine the recent
observation of the cluster Abell 3827 for self-interacting dark matter and the constraints on
the annihilation cross section
for monochromatic lines. We also confront our model to a set of recent experimental
analyses and find that such an extension can naturally produce a monochromatic keVsignal corresponding to recent observations of Perseus or Andromeda while in themeantime predicts self-interacting cross section of the order of $sigma/m simeq 0.1 1~mathrm{cm^2/g}$ as recently claimed in the observation of the cluster Abell 3827.
Lorenzo Calibbi
Title: The Flavour Portal to Dark Matter
Abstract:
In this seminar, I will first review the main features of models of fermion masses andmixing based on new symmetries of flavour. I will then discuss how light the new flavour
dynamics is allowed to be by the constraints from flavour-changing processes andpossible UV completions of this kind of models.
I will then introduce dark matter (DM) as a fermionic singlet under the Standard Model(SM) gauge group that is however charged under the flavour symmetry. Interactions
between DM and SM particles are then only mediated by the scalar fields thatspontaneously break the flavour symmetry, the so-called flavons. In the case of gauged
flavour symmetries, the interactions are also mediated by the flavour gauge bosons. I will
discuss the construction and the generic features of this class of models and then thephenomenology of an explicit example.
Seungwon Baek
Title: Dark matter and muon (g-2) in an extended Ma model
Abstract:Oral presentation (general slots) Last update on 12/5

We consider right-handed neutrino dark matter $N_1$ in local $U(1)_{L_mu-L_ au}$extended Ma model. With the light $U(1)_{mu- au}$ gauge boson ($m_{Z'} sim {cal O}(100)$ MeV) and small $U(1)_{mu- au}$ gauge coupling ($g_{Z'}sim 10^{-4}-10^{-3}$)
which can accommodate the muon $(g-2)$ anomaly and is still allowed by otherexperimental constraints, we show that we can get correct relic density of dark matter for
wide range of dark matter mass ($M_1 sim 10-100$ GeV), although the gauge coupling
constant $g_{Z'}$ is small. This is due to the fact that the annihilation cross section of dark
matter pair is enhanced by $M_1^4/m_{Z'}^4$ in the processes $N_1 N_1 o Z' Z'$ or $N_1
N_1 o Z' H_2$. We also consider the constraints from direct detection, collider searches.
Yuji Omura
Title: Flavor violating Z’ from SO(10) SUSY GUT in High-Scale SUSY
Abstract:
We propose an SO(10) supersymmetric grand unified theory (SUSY GUT), where the SO(10) gauge symmetry breaks down to SU(3)_c times SU(2)_L times U(1)_Y times U(1)_X
at the GUT scale and U(1)_X is radiatively broken at the SUSY-braking scale. In order toachieve the observed Higgs mass around 126 GeV and also to satisfy constraints on
flavor- and/or CP-violating processes, we assume that the SUSY-breaking scale is O(100)
TeV, so that the U(1)_X breaking scale is also O(100) TeV. One big issue in the SO(10)GUTs is how to realize realistic Yukawa couplings. In our model, not only 16-dimensional
but also 10-dimensional matter fields are introduced to predict the observed fermion
masses and mixings. The Standard-Model quarks and leptons are linear combinations of
the 16- and 10-dimensional fields so that the U(1)_X gauge interaction may be flavorviolating. We investigate the current constraints on the flavor-violating Z&#039; interaction
from the flavor physics and discussprospects for future experiments.
Kentarou Mawatari
Title: Dark matter study in the FeynRules/MadGraph5_aMC@NLO framework
Abstract:
We present recent development of simulation tools in the FeynRules/
MadGraph5_aMC@NLO framework to study dark matter at colliders as well as in direct/
indirect dark matter experiments. We show some results for simplified dark matter models
as an example.
(The talk is based on arXiv:1508.05327.)
Seng Pei Liew
Title: Benchmark models for Dark Matter searches at the LHC
Abstract:
We introduce a minimal set of simplified Dark Matter models to facilitate the collider studyof Dark Matter at the LHC. In particular, we focus on the interplay between missing energy
plus X (mono-X) searches and other direct new particle searches within the framework ofsimplified models. Our systematic characterization of simplified Dark Matter models will

Oral presentation (general slots) Last update on 12/5

serve as a guideline for inventing and optimizing mono-X searches for Run-2 and futureruns of the LHC.
Chaehyun Yu
Title: Mono-quarkonium production for dark matter search
Abstract:
We investigate the dark matter production associated with a heavy quarkonium for thedark matter search at colliders. We adopt the effective field theory approach for theinteraction of dark matter with Standard Model (SM) particles. We discuss the dark matterwith flavor-dependent couplings and show that the mono-quarkonium production could be
more effective for the charm-philic or bottom-philic dark matter models. We also discuss
the limitation of the EFT approach at colliders.