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- Dravins, Dainis
(författare)
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Science with the Cherenkov Telescope Array
- 2019
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Bok (refereegranskat)abstract
- The Cherenkov Telescope Array (CTA), will be the major global observatoryfor very high-energy (VHE) gamma-ray astronomy over the next decadeand beyond. The scientific potential of CTA is extremely broad: fromunderstanding the role of relativistic cosmic particles to the search for darkmatter. CTA is an explorer of the extreme universe, probing environmentsfrom the immediate neighbourhood of black holes to cosmic voids on thelargest scales. Covering a huge range in photon energy from 20 GeV to300 TeV, CTA will improve on all aspects of performance with respect tocurrent instruments. Wider field of view and improved sensitivity will enableCTA to survey hundreds of times faster than previous TeV telescopes. Theangular resolution of CTA will approach 1 arc-minute at high energies —the best resolution of any instrument operating above the X-ray band —allowing detailed imaging of a large number of gamma-ray sources. A one totwo order-of-magnitude collection area improvement makes CTA a powerfulinstrument for time-domain astrophysics, three orders of magnitude moresensitive on hour timescales than Fermi-LAT at 30 GeV. The observatorywill operate arrays on sites in both hemispheres to provide full sky coverageand will hence maximise the potential for the rarest phenomena such asvery nearby supernovae, gamma-ray bursts, or gravitational wave transients.With 99 telescopes on the southern site and 19 telescopes on the northernsite, flexible operation will be possible, with sub-arrays available for specifictasks.
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- Gahm, Gösta, 1942-, et al.
(författare)
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Jord, vatten, luft, eld
- 2013
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Bok (populärvet., debatt m.m.)abstract
- Människan mäter sig nu med naturen i att förändra klimatet, livets villkor och dess utveckling. Jorden är en utsatt planet, inte bara genom människans framfart utan också genom krafter utifrån och ett bombardemang av strålning, partiklar och kroppar från rymden. Miljön formas genom en mångfald processer som verkat sedan jorden bildades för 4,6 miljarder år sedan.Jord, vatten, luft, eld är en pedagogisk och medryckande berättelse om vår värld, från atomerna som utgör våra kroppar till galaxerna som omger oss.
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- Gerlee, Philip, 1980, et al.
(författare)
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Scientific Models : Red Atoms, White Lies and Black Boxes in a Yellow Book
- 2016
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- A zebrafish, the hull of a miniature ship, a mathematical equation and a food chain - what do these things have in common? They are examples of models used by scientists to isolate and study particular aspects of the world around us. This book begins by introducing the concept of a scientific model from an intuitive perspective, drawing parallels to mental models and artistic representations. It then recounts the history of modelling from the 16th century up until the present day. The iterative process of model building is described and discussed in the context of complex models with high predictive accuracy versus simpler models that provide more of a conceptual understanding. To illustrate the diversity of opinions within the scientific community, we also present the results of an interview study, in which ten scientists from different disciplines describe their views on modelling and how models feature in their work. Lastly, it includes a number of worked examples that span different modelling approaches and techniques. It provides a comprehensive introduction to scientific models and shows how models are constructed and used in modern science. It also addresses the approach to, and the culture surrounding modelling in different scientific disciplines. It serves as an inspiration for model building and also facilitates interdisciplinary collaborations by showing how models are used in different scientific fields. The book is aimed primarily at students in the sciences and engineering, as well as students at teacher training colleges but will also appeal to interested readers wanting to get an overview of scientific modelling in general and different modelling approaches in particular.
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- Gerlee, Philip, 1980, et al.
(författare)
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Scientific Models
- 2016
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- A zebrafish, the hull of a miniature ship, a mathematical equation and a food chain - what do these things have in common? They are examples of models used by scientists to isolate and study particular aspects of the world around us. This book begins by introducing the concept of a scientific model from an intuitive perspective, drawing parallels to mental models and artistic representations. It then recounts the history of modelling from the 16th century up until the present day. The iterative process of model building is described and discussed in the context of complex models with high predictive accuracy versus simpler models that provide more of a conceptual understanding. To illustrate the diversity of opinions within the scientific community, we also present the results of an interview study, in which ten scientists from different disciplines describe their views on modelling and how models feature in their work. Lastly, it includes a number of worked examples that span different modelling approaches and techniques. It provides a comprehensive introduction to scientific models and shows how models are constructed and used in modern science. It also addresses the approach to, and the culture surrounding modelling in different scientific disciplines. It serves as an inspiration for model building and also facilitates interdisciplinary collaborations by showing how models are used in different scientific fields. The book is aimed primarily at students in the sciences and engineering, as well as students at teacher training colleges but will also appeal to interested readers wanting to get an overview of scientific modelling in general and different modelling approaches in particular.
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- Henriksson, Göran
(författare)
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A Relativistic Binary Black Hole Model for AP Lib : with Kip Thorne's Kerr Black Hole
- 2018
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Some galaxies have violent activities at their nucleus (AGN). The dominant model is a super massive Black Hole surrounded by a bright accretion disk and a dust ring. I have for the first time identified periodic variations in an AGN, AP Lib. The periods in days are 954 (orbit), 45 (prec. of B-comp.), 3.2 (inner disk edge) and 3.1 (jet spin). The central object is a Black Hole with mass 1.26 billion Msun surrounded by an accretion disk seen at an inclination of 77º.1. A Black Hole with a mass of about 5% of the central object moves in an orbit with period 954 days at a distance of 1900 AU. The inclination of the orbital plane is 87º. In the same orbit there are three clouds at the Lagrange points L3, L4 and L5. These eclipse the bright accretion disk and causes three minima. Gravitational lens effects are also observed. A model for the light emitted from the accretion disk around the Kerr Black Hole, by Kip Thorne, has been used to estimate the distance by comparison with the flux received at the Earth. The three clouds prevent a homogenous inflow of matter to the accretion disk and after correction the distance = 0.70 billion light years and the Hubble parameter = 67.3 km/s/Mpc.
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