41 citations · 145 across the 25 of their papers we have counts for
25 papers
Control of emission interval and timing in triggered periodic superradiance
Hideaki Hara, Riku Omoto, Noboru Sasao +6
To achieve more controllable development of coherence in solids, we investigated the effect of a trigger laser tuned to the superradiance transition wavelength on periodic superrad…
Observational tests for a class of scalar-tensor gravity
Kunio Kaneta, Kin-ya Oda, Motohiko Yoshimura
We study observational bounds in a class of scalar-tensor gravity theories recently proposed. Either an upper or lower bound on a conformal factor in these theories is derived from…
A common origin of two accelerating universes: inflation and dark energy
Kunio Kaneta, Kin-ya Oda, Motohiko Yoshimura
We develop a quantum theory of inflaton and its decay product of various gauge boson pairs to investigate the preheating towards thermalized universe. The inflaton decay into gauge…
Analytical and numerical studies of periodic superradiance
Hideaki Hara, Yuki Miyamoto, Junseok Han +6
We conduct a theoretical study to understand the periodic superradiance observed in an Er:YSO crystal. First, we construct a model based on the Maxwell-Bloch equations for a reduce…
Parametrically amplified super-radiance towards hot big bang universe
Motohiko Yoshimura, Kunio Kaneta, Kin-ya Oda
We propose a mechanism of preheating stage after inflation, using a new idea of parametrically amplified super-radiance. Highly coherent state, characterized by macro-coherence of…
Accelerating universe at early and late times in extended Jordan-Brans-Dicke gravity
Kunio Kaneta, Kin-ya Oda, Motohiko Yoshimura
We propose a scenario that can explain the early-time inflation and the late-time dark energy within a unified framework. A scalar potential combining power-law and exponential typ…
Parity violating magnetization at neutrino pair emission using trivalent lanthanoid ions
H. Hara, A. Yoshimi, M. Yoshimura
A new detection method using magnetization generated at triggered radiative emission of neutrino pairs (RENP), (ato…
Macro-coherent radiative emission of neutrino pair between parity-even atomic states
M. Tashiro, B. P. Das, J. Ekman +3
A new scheme to determine the neutrino mass matrix is proposed using atomic de-excitation between two states of a few eV energy spacing. The determination of the smallest neutrino…
New method of galactic axion search
M. Yoshimura, N. Sasao
An appealing candidate of the galactic dark matter is the axion, which was postulated to solve the strong CP (Charge-conjugation Parity) violation problem in the standard particle…
A new method of creating high intensity neutron source
T. Masuda, A. Yoshimi, M. Yoshimura
We propose a new scheme of producing intense neutron beam whose yields exceed those of existing facilities by many orders of magnitude. This scheme uses the recently proposed photo…
Yet another symmetry breaking to be discovered
M. Yoshimura
The discovery of spontaneous symmetry breaking in particle physics was the greatest contribution in Nambu's achievements. There is another class of symmetries that exist in the low…
Basic oscillation measurables in the neutrino pair beam
T. Asaka, M. Tanaka, M. Yoshimura
It is shown that the vector current contribution of neutrino interaction with electrons in ion gives rise to oscillating component, which is absent for the axial-vector contributio…
Photon and neutrino-pair emission from circulating quantum ions
M. Yoshimura, N. Sasao
The recent proposal of photon and neutrino pair beam is extensively investigated. Production rates, both differential and total, of single photon, two-photon and neutrino-pair emit…
Neutrino mass determination using circulating heavy ions
M. Yoshimura
We study process of radiative neutrino pair emission from coherently excited heavy ions (quantum mixture of two ionic states, the grou…
Determination of CP violation parameter using neutrino pair beam
M. Yoshimura, N. Sasao
Neutrino oscillation experiments under neutrino pair beam from circulating excited heavy ions are studied. It is found that detection of double weak events has a good sensitivity t…
Neutrino pair and gamma beams from circulating excited ions
M. Yoshimura, N. Sasao
We propose a new method of producing neutrino pair beam that consists of a mixture of neutrinos and anti-neutrinos of all flavors. The idea is based on a coherent neutrino pair emi…
Radiative emission of neutrino pair free of quantum electrodynamic backgrounds
M. Yoshimura, N. Sasao, M. Tanaka
A scheme of quantum electrodynamic (QED) background-free radiative emission of neutrino pair (RENP) is proposed in order to achieve precision determination of neutrino properties s…
Experimental method of detecting relic neutrino by atomic de-excitation
M. Yoshimura, N. Sasao, M. Tanaka
The cosmic background neutrino of temperature 1.9 K affects rates of radiative emission of neutrino pair (RENP) from metastable excited atoms, since its presence blocks the pair em…
Two-photon paired solitons supported by medium polarization
M. Yoshimura, N. Sasao
We derive for the first time fundamental equations that describe soliton spatial profiles consisting of two-photon mode fields and macroscopic polarization of medium. Numerical sol…
Thorium isomer for radiative emission of neutrino pair
N. Sasao, S. Uetake, A. Yoshimi +2
It is proposed to use the isomer ionic ground state Th embedded in transparent crystals for precision determination of unknown neutrino parameters. Isolation from s…
Radiative emission of neutrino pair from nucleus and inner core electrons in heavy atoms
M. Yoshimura, N. Sasao
Radiative emission of neutrino pair (RENP) from atomic states is a new tool to experimentally investigate undetermined neutrino parameters such as the smallest neutrino mass, the n…
Dynamics of two-photon paired superradiance
M. Yoshimura, N. Sasao, M. Tanaka
We develop for dipole-forbidden transition a dynamical theory of two-photon paired superradiance, or PSR for short. This is a cooperative process characterized by two photons back…
Light Propagation and Paired Superradiance in Coherent Medium
M. Yoshimura
The problem of light propagation of frequency corresponding to half of the energy difference between a metastable excited state and the ground state of atoms is examined, and solve…
Parity violating observables in radiative neutrino pair emission from metastable atoms
M. Yoshimura, A. Fukumi, N. Sasao +1
We report on a possibility of measuring parity violating effects in radiative neutrino pair emission from metastable atoms; asymmetric angular distribution of emitted photons from…