616 EB-Strengthening of Carbon reinforced plastics

Oguri, Kazuta; Mizutani, Akihiro; Motai, Norihito; Tonegawa, Akira; Nishi, Yoshitake

doi:10.1299/jsmeintmp.10.2.508

Cited by 87 publications

(169 citation statements)

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“…Qi et al (2018) have found that, combining about 16000 strong lensing events combined with the distance information provided by 500 compact radio quasars, one can constrain the cosmic curvature with an accuracy of Ω k 10 −3 , which is comparable to the precision of Planck 2015 results. The upcoming LSST, which will monitor nearly half of the sky for 10 years by repeatedly scanning the field and is supposed to find ∼ 10 3 lensed quasars (Oguri & Marshall 2010), will greatly improve this direct geometrical measurement for cosmic curvature.…”

Section: Resultsmentioning

confidence: 99%

Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems

Zhou

2020

ApJ

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Model-independent measurements for the cosmic spatial curvature, which is related to the nature of cosmic space-time geometry, plays an important role in cosmology. On the basis of the Distance Sum Rule in the Friedmann-Lemaître-Robertson-Walker metric, (distance ratio) measurements of strong gravitational lensing (SGL) systems together with distances from type Ia supernovae observations have been proposed to directly estimate the spatial curvature without any assumptions for the theories of gravity and contents of the universe. However, previous studies indicated that a spatially closed universe was strongly preferred. In this paper, we re-estimate the cosmic curvature with the latest SGL data which includes 163 well-measured systems. In addition, possible factors, e.g. combination of SGL data from different surveys and stellar mass of the lens galaxy, which might affect estimations for the spatial curvature, are considered in our analysis. We find that, except the case where only SGL systems from the Sloan Lens ACS Survey are considered, a spatially flat universe is consistently favored at very high confidence level by the latest observations. It is suggested that the increasing number of well-measured strong lensing events might significantly reduce the bias of estimation for the cosmic curvature.

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Section: Resultsmentioning

confidence: 99%

Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems

Zhou

2020

ApJ

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“…On the one hand, further progress in this direction has recently been achieved by the very-long-baseline interferometry (VLBI) observations, which showed that the angular diameter distances insensitive to the opacity of the Universe can be derived from the compact structure in intermediate luminosity radio quasars (Cao et al 2017b,c). More importantly, LSST should detected 3000 galactic-scale strong lensing systems with quasars acting as background sources (Oguri & Marshall 2010), which, combined with strongly lensed SNe Ia, will results in more stringent constraints on the opacity of the Universe. The quasar simulation was carried out in the following way: (I) When calculating the sampling distribution (number density) of lensed quasars expected for the baseline survey planned with LSST, we adopt the differential rate of lensed quasar events as a function of z s , based on the standard double power law for the quasar luminosity function calibrated by strong lensing effects (Oguri & Marshall 2010).…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…More importantly, LSST should detected 3000 galactic-scale strong lensing systems with quasars acting as background sources (Oguri & Marshall 2010), which, combined with strongly lensed SNe Ia, will results in more stringent constraints on the opacity of the Universe. The quasar simulation was carried out in the following way: (I) When calculating the sampling distribution (number density) of lensed quasars expected for the baseline survey planned with LSST, we adopt the differential rate of lensed quasar events as a function of z s , based on the standard double power law for the quasar luminosity function calibrated by strong lensing effects (Oguri & Marshall 2010). (II) In each simulation, there are 3000 lensed quasars covering the redshift range of 0.40 < z < 5.0 and 1000 data points are located in the redshifts of 0.40 < z < 1.70.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

Ma¹,

Cao²,

Zhang³

et al. 2019

ApJ

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In this paper, we present a scheme to investigate the opacity of the Universe in a cosmological-modelindependent way, with the combination of current and future measurements of type Ia supernova sample and galactic-scale strong gravitational lensing systems with SNe Ia acting as background sources. The observational data include the current newly-compiled SNe Ia data (Pantheon sample) and simulated sample of SNe Ia observed by the forthcoming Large Synoptic Survey Telescope (LSST) survey, which are taken for luminosity distances (D L ) possibly affected by the cosmic opacity, as well as strongly lensed SNe Ia observed by the LSST, which are responsible for providing the observed time-delay distance (D ∆t ) unaffected by the cosmic opacity. Two parameterizations, τ (z) = 2βz and τ (z) = (1 + z) 2β − 1 are adopted for the optical depth associated to the cosmic absorption. Focusing on only one specific type of standard cosmological probe, this provides an original method to measure cosmic opacity at high precision. Working on the simulated sample of strongly lensed SNe Ia observed by the LSST in 10 year z-band search, our results show that, with the combination of the current newly-compiled SNe Ia data (Pantheon sample), there is no significant deviation from the transparency of the Universe at the current observational data level. Moreover, strongly lensed SNe Ia in a 10 year LSST z-band search would produce more robust constraints on the validity of cosmic transparency (at the precision of ∆β = 10 −2 ), with a larger sample of unlensed SNe Ia detected in future LSST survey. We have also discussed the ways in which our methodology could be improved, with the combination of current and future available data in gravitational wave (GW) and electromagnetic (EM) domain. Therefore, the proposed method will allow not only to check the foundations of observational cosmology (a transparent universe), but also open the way to identify completely new physics (non-standard physics).

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“…Further into the future, the LSST project (Abell et al 2009) expects to observe the entire Southern hemisphere to much greater depth in multiple visits, with still better image quality (about 0.7 arcsec). This will find a very large number of strong lens systems (Oguri & Marshall 2010) but from a finding sample too large to rely on complete searches by eye, as has hitherto been possible (e.g. Jackson 2008) and automated algorithms will be required.…”

Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

New lensed quasars from the MUSCLES survey

Jackson¹,

Rampadarath²,

Ofek³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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Gravitational lens systems containing lensed quasars are important as cosmological probes, as diagnostics of structural properties of the lensing galaxies and as tools to study the quasars themselves. The largest lensed quasar sample is the SDSS Quasar Lens Search, drawn from the Sloan Digital Sky Survey (SDSS). We are attempting to extend this survey using observations of lens candidates selected from a combination of the quasar sample from the SDSS and the UKIRT Infrared Deep Sky Survey (UKIDSS). This adds somewhat higher image quality together with a wider range of wavelength for the selection process. In previous pilot surveys we observed 5 objects, finding 2 lenses; here we present further observations of 20 objects in which we find 4 lenses, of which 2 are independently discovered in SQLS (in preparation). Following earlier work on the combination of these two surveys, we have refined our method and find that use of a colour-separation diagnostic, where we select for separations between components which appear to decrease in wavelength, is an efficient method to find lensed quasars and may be useful in ongoing and future large-scale strong lensing surveys with instruments such as Pan-STARRS and LSST. The new lenses have mostly high flux ratios, with faint secondaries buried in the lensing galaxy and typically 6-10 times less bright than the primary. Our survey brings the total number of lenses discovered in the SDSS quasar sample to 46, plus 13 lenses already known. This is likely to be up to 60-70% of the total number of lensed quasars; we briefly discuss strategies by which the rest might be found.Comment: 12 pages, 7 figures. Accepted by MNRA

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616 EB-Strengthening of Carbon reinforced plastics

Cited by 87 publications

References 0 publications

Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems

Model-independent Estimations for the Cosmic Curvature from the Latest Strong Gravitational Lensing Systems

Testing Cosmic Opacity with the Combination of Strongly Lensed and Unlensed Supernova Ia

New lensed quasars from the MUSCLES survey

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