Fumihiro Takayama

J-GLOBAL         Last updated: Jun 4, 2019 at 16:30
 
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Name
Fumihiro Takayama
Affiliation
Kyoto University
Job title
Associate Professor
Degree
Ph.D(東北大学)

Published Papers

 
Tatsuo Kobayashi, Yuji Omura, Fumihiro Takayama, Daiki Yasuhara
JHEP 1510(2015)042      May 2015   [Refereed]
Flavor symmetric model is one of the attractive Beyond Standard Models (BSMs)
to reveal the flavor structure of the Standard Model (SM). A lot of efforts
have been put into the model building and we find many kinds of flavor
symmetries and setups ...
Yuta Hamada, Tatsuo Kobayashi, Atsushi Ogasahara, Yuji Omura, Fumihiro Takayama, Daiki Yasuhara
JHEP10(2014)183      May 2014   [Refereed]
We revisit the discrete dark matter model with Tex flavor symmetry
originally introduced by M.Hirsch {\it et.al}. We show that radiative
corrections can lead to non-zero Tex and non-zero mass for the
lightest neutrino. We find an inter...
W. Buchmüller; A. Ibarra; T. Shindou; F. Takayama; D. Tran
Journal of Cosmology and Astroparticle Physics   2009(9)    Jun 2009   [Refereed]
We analyze the cosmic-ray signatures of decaying gravitino dark matter in a
model independent way based on an operator analysis. Thermal leptogenesis and
universal boundary conditions at the GUT scale restrict the gravitino mass to
be below 600 Ge...
J.A.R. Cembranos; A. Rajaraman; F. Takayama
EPL   82(2)    2008   [Refereed]
J.L. Feng; B.T. Smith; F. Takayama
Physical Review Letters   100(2)    Sep 2007   [Refereed]
Neutralino dark matter is well motivated, but also suffers from two
shortcomings: it requires gravity-mediated supersymmetry breaking, which
generically violates flavor constraints, and its thermal relic density \Omega
is typically too large. We p...
F. Takayama
Physical Review D - Particles, Fields, Gravitation and Cosmology   77(11)    Apr 2007   [Refereed]
We discuss the impact of charged massive particle big bang
nucleosynthesis(CBBN) to explore the nature of the reheating of the Universe in
the case that a new extremely long-lived charged massive particle(CHAMP)
exists. If the mass of the CHAMP is...
K. Kohri; F. Takayama
AIP Conference Proceedings   903 587-590   2007
We consider Big Bang Nucleosynthesis(BBN) with long lived charged massive
particles. Before decaying, the long lived massive particles recombines with a
light element to form a bound state like a hydrogen atom. We discuss the
possible change of pr...
K. Kohri; F. Takayama
Physical Review D - Particles, Fields, Gravitation and Cosmology   76(6)    May 2006   [Refereed]
We consider Big Bang Nucleosynthesis (BBN) with long lived charged massive
particles. Before decaying, the long lived charged particle recombines with a
light element to form a bound state like a hydrogen atom. This effect modifies
the nuclear rea...
Jose A. R. Cembranos, Jonathan L. Feng, Arvind Rajaraman, Bryan T. Smith, Fumihiro Takayama
ECONFC0508141:ALCPG0334,2005      Mar 2006
SuperWeakly-Interacting Massive Particles (superWIMPs) produced in the late
decays of other particles are well-motivated dark matter candidates and may be
favored over standard Weakly-Interacting Massive Particles (WIMPs) by small
scale structure ...
Jose A. R. Cembranos, Antonio Dobado, Jonathan L. Feng, Antonio L. Maroto, Arvind Rajaraman, Fumihiro Takayama
ECONFC0508141:ALCPG0110,2005      Dec 2005
We summarize the main features of several dark matter candidates in
extra-dimensional theories. In particular, we review Kaluza-Klein (KK)
gravitons in universal extra dimensions and branons in brane-world models. KK
gravitons are superWIMP (super...

Conference Activities & Talks

 
Tiny flavor symmetry breaking neutrino masses and dark matter [Invited]
Fumihiro Takayama
Dark Side of the Universe 2017 at Daegeon, South Korea   10 Jul 2017   
Neutrino and dark matter portal to new horizon beyond standard model [Invited]
Fumihiro Takayama
Hamburg University - Kyoto University joint symposium   Jun 2017   
Majorana Fermion Dark Matter from Flavor Symmetry [Invited]
Fumihiro Takayama
Dark Side of the Universe 2016 at Bergen, Norway   25 Jul 2016   
Revisiting Discrete Dark Matter Model: non-zero theta13 and \nu_R dark matter [Invited]
Fumihiro Takayama
Dark Dide of the Universe 2104 at Cape Town, South Africa   17 Oct 2014   
Variants of dark matter properties in elementary particle models [Invited]
Fumihiro Takayama
SKKU International Symposium on Astrophysics and Cosmology: from Particle to Universe   2 Dec 2013