1,583 research outputs found
Meson Life Time in the Anisotropic Quark-Gluon Plasma
In the hot (an)isotropic plasma the meson life time is defined as a
time scale after which the meson dissociates. According to the gauge/gravity
duality, this time can be identified with the inverse of the imaginary part of
the frequency of the quasinormal modes, , in the (an)isotropic black
hole background. In the high temperature limit, we numerically show that at
fixed temperature(entropy density) the life time of the mesons
decreases(increases) as the anisotropy parameter raises. For general case, at
fixed temperature we introduce a polynomial function for and observe
that the meson life time decreases. Moreover, we realize that ,
where and are entropy density and temperature of the plasma
respectively, can be expressed as a function of anisotropy parameter over
temperature. Interestingly, this function is a Pad\'{e} approximant.Comment: 5 pages, 4 figures, 1 tabl
Meson Excitation at Finite Chemical Potential
We consider a probe stable meson in the holographic quark-gluon plasma at
zero temperature and chemical potential. Due to the energy injection into the
plasma, the temperature and chemical potential are increased to arbitrary
finite values and the meson is also excited. Excitation time tex is the time at
which the meson falls into the final excited state. We study the effect of
various parameters of theory on the excitation time and observe that for larger
values of final temperature and chemical potential the excitation time
increases. Furthermore, our outcomes show that the more stable mesons are
excited sooner.Comment: 10 pages, 9 figures, references added, appendix added, typos
correcte
A bioinspired optoelectronically engineered artificial neurorobotics device with sensorimotor functionalities
Development of the next generation of bio- and nano-electronics is inseparably connected to the innovative concept of emulation and reproduction of biological sensorimotor systems and artificial neurobotics. Here, we report for the first time principally new artificial bioinspired optoelectronic sensorimotor system for the controlable immitation of opto-genetically engineered neurons in the biological motor system. The device is based on inorganic optical synapse (In-doped TiO2 nanofilm) assembled into a liquid metal (galinstan) actuator. The optoelectronic synapse generates polarised excitatory and inhibitory postsynaptic potentials to trigger the liquid metal droplet to vibrate and then mimic the expansion and contraction of biological fibre muscle. The low-energy consumption and precise modulation of electrical and mechanical outputs are the distinguished characteristics of fabricated sensorimotor system. This work is the underlying significant step towards the development of next generation of low-energy the internet of things for bioinspired neurorobotic and bioelectronic system
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