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Author : Michael Loyola Brown
Release : 2003
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Probing Dark Matter with Intrinsic and Extrinsic Galaxy Alignments by : Michael Loyola Brown
Download or read book Probing Dark Matter with Intrinsic and Extrinsic Galaxy Alignments written by Michael Loyola Brown. This book was released on 2003. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael Loyola Brown
Release : 2003
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Probing Dark Matter with Intrinsic and Extrinsic Galaxy Alignments by : Michael Loyola Brown
Download or read book Probing Dark Matter with Intrinsic and Extrinsic Galaxy Alignments written by Michael Loyola Brown. This book was released on 2003. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Masato Shirasaki
Release : 2015-11-18
Genre : Science
Kind : eBook
Book Rating : 967/5 ( reviews)
Book Synopsis Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics by : Masato Shirasaki
Download or read book Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics written by Masato Shirasaki. This book was released on 2015-11-18. Available in PDF, EPUB and Kindle. Book excerpt: In this book the applicability and the utility of two statistical approaches for understanding dark energy and dark matter with gravitational lensing measurement are introduced. For cosmological constraints on the nature of dark energy, morphological statistics called Minkowski functionals (MFs) to extract the non-Gaussian information of gravitational lensing are studied. Measuring lensing MFs from the Canada–France–Hawaii Telescope Lensing survey (CFHTLenS), the author clearly shows that MFs can be powerful statistics beyond the conventional approach with the two-point correlation function. Combined with the two-point correlation function, MFs can constrain the equation of state of dark energy with a precision level of approximately 3–4 % in upcoming surveys with sky coverage of 20,000 square degrees. On the topic of dark matter, the author studied the cross-correlation of gravitational lensing and the extragalactic gamma-ray background (EGB). Dark matter annihilation is among the potential contributors to the EGB. The cross-correlation is a powerful probe of signatures of dark matter annihilation, because both cosmic shear and gamma-ray emission originate directly from the same dark matter distribution in the universe. The first measurement of the cross-correlation using a real data set obtained from CFHTLenS and the Fermi Large Area Telescope was performed. Comparing the result with theoretical predictions, an independent constraint was placed on dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter.
Author : Charles Keeton
Release : 2014-04-30
Genre : Science
Kind : eBook
Book Rating : 126/5 ( reviews)
Book Synopsis A Ray of Light in a Sea of Dark Matter by : Charles Keeton
Download or read book A Ray of Light in a Sea of Dark Matter written by Charles Keeton. This book was released on 2014-04-30. Available in PDF, EPUB and Kindle. Book excerpt: What’s in the dark? Countless generations have gazed up at the night sky and asked this question—the same question that cosmologists ask themselves as they study the universe. The answer turns out to be surprising and rich. The space between stars is filled with an exotic substance called “dark matter” that exerts gravity but does not emit, absorb, or reflect light. The space between galaxies is rife with “dark energy” that creates a sort of cosmic antigravity causing the expansion of the universe to accelerate. Together, dark matter and dark energy account for 95 percent of the content of the universe. News reporters and science journalists routinely talk about these findings using terms that they assume we have a working knowledge of, but do you really understand how astronomers arrive at their findings or what it all means? Cosmologists face a conundrum: how can we study substances we cannot see, let alone manipulate? A powerful approach is to observe objects whose motion is influenced by gravity. Einstein predicted that gravity can act like a lens to bend light. Today we see hundreds of cases of this—instances where the gravity of a distant galaxy distorts our view of a more distant object, creating multiple images or spectacular arcs on the sky. Gravitational lensing is now a key part of the international quest to understand the invisible substance that surrounds us, penetrates us, and binds the universe together. A Ray of Light in a Sea of Dark Matter offers readers a concise, accessible explanation of how astronomers probe dark matter. Readers quickly gain an understanding of what might be out there, how scientists arrive at their findings, and why this research is important to us. Engaging and insightful, Charles Keeton gives everyone an opportunity to be an active learner and listener in our ever-expanding universe. Watch a video with Charles Keeton: Watch video now. (http://www.youtube.com/watch?v=Uc3byXNS1G0).
Author : 周家俊
Release : 2023
Genre : Dark matter (Astronomy)
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Probing High-z Galaxies and Dark Matter with Gravitational Lensing by : 周家俊
Download or read book Probing High-z Galaxies and Dark Matter with Gravitational Lensing written by 周家俊. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt:
