Zobrazeno 1 - 10
of 183
pro vyhledávání: '"Nakamura, Shintaro"'
Autor:
Nakamura, Shintaro, Sugiyama, Masashi
We study the real-valued combinatorial pure exploration of the multi-armed bandit in the fixed-budget setting. We first introduce the Combinatorial Successive Asign (CSA) algorithm, which is the first algorithm that can identify the best action even
Externí odkaz:
http://arxiv.org/abs/2310.15681
Autor:
Nakamura, Shintaro, Sugiyama, Masashi
We study the real-valued combinatorial pure exploration of the multi-armed bandit (R-CPE-MAB) problem. In R-CPE-MAB, a player is given $d$ stochastic arms, and the reward of each arm $s\in\{1, \ldots, d\}$ follows an unknown distribution with mean $\
Externí odkaz:
http://arxiv.org/abs/2308.10238
Autor:
Nakamura, Shintaro, Sugiyama, Masashi
We study the real-valued combinatorial pure exploration problem in the stochastic multi-armed bandit (R-CPE-MAB). We study the case where the size of the action set is polynomial with respect to the number of arms. In such a case, the R-CPE-MAB can b
Externí odkaz:
http://arxiv.org/abs/2306.09202
Optimal transport (OT) has become a widely used tool in the machine learning field to measure the discrepancy between probability distributions. For instance, OT is a popular loss function that quantifies the discrepancy between an empirical distribu
Externí odkaz:
http://arxiv.org/abs/2212.13251
Publikováno v:
Phys. Rev. D 102, 063531 (2020)
We study a coupled dark energy scenario in which a massive vector field $A_{\mu}$ with broken $U(1)$ gauge symmetry interacts with the four-velocity $u_c^{\mu}$ of cold dark matter (CDM) through the scalar product $Z=-u_c^{\mu} A_{\mu}$. This new cou
Externí odkaz:
http://arxiv.org/abs/2004.09384
Autor:
Yanagisawa, Tatsuya, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Nakamura, Shintaro, Awaji, Satoshi, Green, Elizabeth L., Zherlitsyn, Sergei, Wosnitza, Joachim, Yazici, Duygu, White, Benjamin. D., Maple, M. Brian
Publikováno v:
Philosophical Magazine, 2020
In this study, ultrasonic measurements were performed on a single crystal of cubic PrNi$_2$Cd$_{20}$, down to a temperature of 0.02 K, to investigate the crystalline electric field ground state and search for possible phase transitions at low tempera
Externí odkaz:
http://arxiv.org/abs/1911.11914
Publikováno v:
JCAP12(2019)032
We provide a general framework for studying the evolution of background and cosmological perturbations in the presence of a vector field $A_{\mu}$ coupled to cold dark matter (CDM). We consider an interacting Lagrangian of the form $Q f(X) T_c$, wher
Externí odkaz:
http://arxiv.org/abs/1907.12216
Publikováno v:
J. Phys. Soc. Jpn. 88, 023704 (2019)
Successive magnetic phase transitions at $T_1$=17.5 K and $T_2$=18.5 K in Gd$_3$Ru$_4$Al$_{12}$, with a distorted kagome lattice of Gd ions, is studied using resonant X-ray diffraction with polarization analysis. It has been suggested that in this co
Externí odkaz:
http://arxiv.org/abs/1901.04231
Publikováno v:
Phys. Rev. D 99, 063533 (2019)
The gravitational-wave event GW170817, together with the electromagnetic counterpart, shows that the speed of tensor perturbations $c_T$ on the cosmological background is very close to that of light $c$ for the redshift $z<0.009$. In generalized Proc
Externí odkaz:
http://arxiv.org/abs/1811.07541
Publikováno v:
Phys. Rev. D 96, 084005 (2017)
We derive the profile of a vector field coupled to matter on a static and spherically symmetric background in the context of generalized Proca theories. The cubic Galileon self-interaction leads to the suppression of a longitudinal vector component d
Externí odkaz:
http://arxiv.org/abs/1707.09194