Stern<i>et al.</i>Reply:

Stern, Michael; Garmider, V.; Segre, Enrico; Rappaport, M.; Umansky, V.; Bar‐Joseph, I.

doi:10.1103/physrevlett.104.179702

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…These criteria favor the DDE options since ln A, ln B > 0 for them. We use a rich and updated SNIa+BAO+H(z)+LSS+CMB data set, to wit: 31 effective points from the JLA sample of SNIa [18], 11 from BAO [19][20][21][22][23][24], 30 from H(z) [25][26][27][28][29][30][31], 13 from f (z)σ8(z) (LSS, mostly RSD) [19,[32][33][34][35][36][37][38][39][40], and 4 from CMB [41]. See [42,43] for more details.…”

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confidence: 99%

Dynamical dark energy vs. Λ = const in light of observations

Peracaula

Pérez

Gómez-Valent

2018

EPL

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After about two decades of the first observational papers confirming the accelerated expansion of the universe, we are still facing the question whether the cause of it is a rigid cosmological constant Λ-term or a mildly evolving dynamical dark energy (DDE). While studies focusing mainly on CMB measurements do not perceive signs of physics beyond the ΛCDM, in this work we show that if we take a large string SNIa+BAO+H(z)+LSS+CMB of modern cosmological observations, in which not only the CMB but also a rich sample of large scale structure formation data are included, one can extract ∼ 3.3σ signs of DDE using a simple XCDM parameterization. These signs can be enhanced up to near 3.8σ in the context of the running vacuum model (RVM), in which the vacuum energy density is in interaction with dark matter. Recently the RVM has been shown to provide an efficient and economical solution to the σ8-tension, which is one of the intriguing phenomenological problems that has not been possible to solve within the ΛCDM so far. This fact contributes to strengthen the possibility that dynamical vacuum energy, or in general DDE, could be presently favored by the observations.

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confidence: 99%

Dynamical dark energy vs. Λ = const in light of observations

Peracaula

Pérez

Gómez-Valent

2018

EPL

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“…Applying electric fields across the quantum dots (QD) alter the electronic states and hence researches on the quantum confined Stark effect (QCSE) is increasingly important for the applications of QD based devices [1][2][3][4][5]. Coupled double quantum well (CDQW) systems are also ideal for a Bose-Einstein condensation of excitons [6,7] and metal to insulator transitions [8,9].In a bulk semiconductor, with sufficiently high electric fields, excitons can be ionized by driving the electrons and holes in opposite directions. However, unlike a bulk semiconductor, application of electric fields across a quantum well cannot break apart excitons because the barrier prevent such field induced exciton ionization.…”

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confidence: 99%

Optically induced level anticrossing in undoped GaAs/AlGaAs coupled double quantum wells

Shin¹,

Park²,

Kim³

et al. 2010

Journal of Luminescence

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Generation of low-frequency squeezed states

Zeng-Jun¹,

Ze-Hui²,

Sun³

et al. 2016

Acta Phys. Sin.

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Squeezed state of light is an important resource of optical measuerments below the shot noise limit and has been used to improve measurement sensitivity in many areas such as gravitational wave detection, especially in audio frequency region. Compared with the high-frequency squeezed states, the generation of the low-frequency squeezed states is more difficult, because it is limited by several technical noise sources. In this paper we report the observation of more than 2 dB of vacuum squeezing at 1064 nm in the gravitational-wave detection band down to 3 kHz with a double-resonant optical parametric oscillator (OPO). The OPO has a configuration of linear cavity consisting of an input coupling mirror with a transmission of 11% at 532 nm and an output coupling mirror with the transmission of 12% at 1064 nm. The nonlinear materials in the OPO is type-I periodically poled potassium titanyl phosphate (PPKTP) crystal which is chosen for this experiment due to its higher nonlinearity, broader phase matching temperature, and smaller photo-thermal effect. The OPO is pumped by the light of 532 nm from Nd: YVO4/KTP solid-state laser of maximum optical power 3 W. To avoid various noise coupled from the seed beam, the OPO is seeded by vacuum fluctuations instead of coherent field at the fundamental wavelength (1064 nm). A Pound-Drever-Hall (PDH) locking scheme is used to lock the OPO cavity length with the signal derived from the reflected pump beam, so as to lock the pump field and also lock the fundamental field. To make both the pump and seed beams resonant simultaneously, the temperature of the PPKTP is carefully adjusted. The squeezed state can be detected on a homodyne detection by interfering it with the local oscillator (LO) and detected by a balanced detector with two photodiodes (EXT500 T) but having the same quantum efficiency of 86% at 1064 nm. The subsequent electronic noise is analyzed with a low-frequency spectrum analyzer, which shows that the audio noise sources from lab enviroment, locking quality, escape efficiency, propagation loss, homodyne efficiency and detection efficiency have effect on the squeezing pruced by an OPO.

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Sternet al.Reply:

Cited by 4 publications

References 4 publications

Dynamical dark energy vs. Λ = const in light of observations

Dynamical dark energy vs. Λ = const in light of observations

Optically induced level anticrossing in undoped GaAs/AlGaAs coupled double quantum wells

Generation of low-frequency squeezed states

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