› › Search For Light Primordial Black Holes With Veritas Using Gamma

Search for Light Primordial Black Holes with VERITAS Using Gamma Γ-ray and Optical Observations

Author : Konstantin Johannes Pfrang

Publisher :

Page : 0 pages

File Size : 16,16 MB

Release : 2023*

Category :

ISBN :

Get eBook

Book Description

The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of four imaging atmospheric Cherenkov telescopes (IACTs). VERITAS is sensitive to very-high-energy gamma-rays in the range of 100 GeV to >30 TeV. Hypothesized primordial black holes (PBHs) are attractive targets for IACTs. If they exist, their potential cosmological impact reaches beyond the candidacy for constituents of dark matter. The sublunar mass window is the largest unconstrained range of PBH masses. This thesis aims to develop novel concepts searching for light PBHs with VERITAS. PBHs below the sublunar window lose mass due to Hawking radiation. They would evaporate at the end of their lifetime, leading to a short burst of gamma-rays. If PBHs formed at about 10^15 g, the evaporation would occur nowadays. Detecting these signals might not only confirm the existence of PBHs but also prove the theory of Hawking radiation. This thesis probes archival VERITAS data recorded between 2012 and 2021 for possible PBH signals. This work presents a new ...



Search for Very-high-energy Gamma-ray Emission from Primordial Black Holes with Veritas

Author : Simon Archambault

Publisher :

Page : pages

File Size : 41,95 MB

Release : 2016

Category :

ISBN :

Get eBook

Book Description

"Primordial black holes are black holes that may have formed from density fluctuations in the early universe. It has been theorized that black holes slowly evaporate. If primordial black holes of initial mass 10^14g (or 10^−20 times the mass of the Sun) were formed, their evaporation would end in this epoch, in a bright burst of very-high-energy gamma rays. A Cherenkov telescope experiment like VERITAS can then look for these primordial black hole bursts in its data, in the hopes of constraining the rate-density of their final evaporation. This work describes the search for such black holes, using the VERITAS telescopes, as well as developing new techniques in order to reach better limits. The 99% C.L. upper limits obtained in this work are of 2.22 × 10^4 pc^−3 yr^−1, an improvement from previous VERITAS limits by a factor of 6, as well as from limits measured by other experiments." --







Searching for Dark Matter with Cosmic Gamma Rays

Author : Andrea Albert

Publisher : Morgan & Claypool Publishers

Page : 64 pages

File Size : 15,21 MB

Release : 2016-09-06

Category : Science

ISBN : 1681742691

Get eBook

Book Description

Searching for Dark Matter with Cosmic Gamma Rays summarizes the evidence for dark matter and what we can learn about its particle nature using cosmic gamma rays. It has almost been 100 years since Fritz Zwicky first detected hints that most of the matter in the Universe that doesn't directly emit or reflect light. Since then, the observational evidence for dark matter has continued to grow. Dark matter may be a new kind of particle that is governed by physics beyond our Standard Model of particle physics. In many models, dark matter annihilation or decay produces gamma rays. There are a variety of instruments observing the gamma-ray sky from tens of MeV to hundreds of TeV. Some make deep, focused observations of small regions, while others provide coverage of the entire sky. Each experiment offers complementary sensitivity to dark matter searches in a variety of target sizes, locations, and dark matter mass scales. We review results from recent gamma-ray experiments including anomalies some have attributed to dark matter. We also discuss how our gamma-ray observations complement other dark matter searches and the prospects for future experiments.



Searching for Primordial Black Holes

Author : Olivia Ross

Publisher :

Page : 0 pages

File Size : 38,40 MB

Release : 2020

Category : Astrophysics

ISBN :

Get eBook

Book Description

Primordial black holes (PBH) are a promising candidate for dark matter. Because they do not interact with light and are potentially quite small, we aim to develop new observational probes that might allow us to constrain or detect them. Pulsars are extremely regular clocks and are thus quite sensitive probes of gravitational perturbation. If a PBH were captured in orbit around a pulsar, its gravitational impacts on the pulsar may lead to visible and periodic changes in the pulsar timing, providing a unique opportunity for observations. By studying three-body dynamics as a mechanism of capture, we have found equations for capture rates and ejection timescales, leading to estimates of captured populations of PBHs in arbitrary binary systems. We find that the ejection timescale for the solar system is on the scale of 5 x 105 years, which agrees with previous work. We have also analyzed the distribution of orbital parameters of these bound objects. Knowing the expected size and orbital parameters of a population of bound PBHs in any given binary system allows us to predict the visible effects in pulsar timing. If we see the effects we expect, we have further reason to believe that PBHs exist. If we do not see these effects, we can further constrain PBHs.



Advances In Very High Energy Astrophysics: The Science Program Of The Third Generation Iacts For Exploring Cosmic Gamma Rays

Author : Reshmi Mukherjee

Publisher : World Scientific

Page : 507 pages

File Size : 25,21 MB

Release : 2024-09-03

Category : Science

ISBN : 9813275731

Get eBook

Book Description

Very-high-energy astrophysics studies the most energetic photons in the sky, allowing the exploration of violent and extreme non-thermal phenomena in the Universe. Significant advances in knowledge have been made in this field using ground-based imaging atmospheric Cherenkov telescopes (IACTs) as detectors, to study these physical processes in the Universe. This book reviews the progress in the field since the advent of the second generation IACTs around 2004. Going through the scientific highlights obtained by the three current instruments of this kind, H.E.S.S., MAGIC and VERITAS, operating now for more than 15 years, this book presents a state-of-the-art knowledge in four areas of modern astrophysics and cosmology, namely the origin of the cosmic rays, the physics of compact objects and their resulting relativistic outflows, gamma-ray cosmology, and the search for dark matter. Along with a detailed review of the outstanding scientific outcomes, a summary of the key technological developments that yielded the recognized success of the technique is also provided.This book is written for early-career academics in the fields of astrophysics, high energy physics and cosmology. At the same time, it can serve as a source of reference for the expert in the field.



High Energy Gamma-Ray Astronomy

Author : Felix A. Aharonian

Publisher : American Institute of Physics

Page : 908 pages

File Size : 49,37 MB

Release : 2001-04-27

Category : Science

ISBN : 9781563969904

Get eBook

Book Description

This conference was attended by leading experts in the field of gamma-ray astronomy as well as students and postdocs from around the world. The symposium concerned the basic observational and theoretical topics and the objectives of the rapidly developing field of gamma-ray astronomy in the energy range above 10 GeV, with emphasis on the connections between physics at GeV and TeV energies by which the most violent processes in the universe manifest themselves. The topics ranged from particle acceleration in different astrophysical environments, the origin of cosmic rays, and the relativistic astrophysics of jets and winds from compact galactic objects and active galactic nuclei, to observational cosmology. They comprised almost all known and expected gamma-ray populations and their contributions to the non-thermal inventory of the Universe. The symposium was primarily concerned with the scientific aspects of the field and less with the development of instrumentation.



New Worlds, New Horizons in Astronomy and Astrophysics

Author : National Research Council

Publisher : National Academies Press

Page : 324 pages

File Size : 10,47 MB

Release : 2011-02-04

Category : Science

ISBN : 0309157994

Get eBook

Book Description

Driven by discoveries, and enabled by leaps in technology and imagination, our understanding of the universe has changed dramatically during the course of the last few decades. The fields of astronomy and astrophysics are making new connections to physics, chemistry, biology, and computer science. Based on a broad and comprehensive survey of scientific opportunities, infrastructure, and organization in a national and international context, New Worlds, New Horizons in Astronomy and Astrophysics outlines a plan for ground- and space- based astronomy and astrophysics for the decade of the 2010's. Realizing these scientific opportunities is contingent upon maintaining and strengthening the foundations of the research enterprise including technological development, theory, computation and data handling, laboratory experiments, and human resources. New Worlds, New Horizons in Astronomy and Astrophysics proposes enhancing innovative but moderate-cost programs in space and on the ground that will enable the community to respond rapidly and flexibly to new scientific discoveries. The book recommends beginning construction on survey telescopes in space and on the ground to investigate the nature of dark energy, as well as the next generation of large ground-based giant optical telescopes and a new class of space-based gravitational observatory to observe the merging of distant black holes and precisely test theories of gravity. New Worlds, New Horizons in Astronomy and Astrophysics recommends a balanced and executable program that will support research surrounding the most profound questions about the cosmos. The discoveries ahead will facilitate the search for habitable planets, shed light on dark energy and dark matter, and aid our understanding of the history of the universe and how the earliest stars and galaxies formed. The book is a useful resource for agencies supporting the field of astronomy and astrophysics, the Congressional committees with jurisdiction over those agencies, the scientific community, and the public.



Neutrino Mass

Author : Guido Altarelli

Publisher : Springer

Page : 0 pages

File Size : 11,69 MB

Release : 2004-02-24

Category : Science

ISBN : 3540449019

Get eBook

Book Description

Reviews the current state of knowledge of neutrino masses and the related question of neutrino oscillations. After an overview of the theory of neutrino masses and mixings, detailed accounts are given of the laboratory limits on neutrino masses, astrophysical and cosmological constraints on those masses, experimental results on neutrino oscillations, the theoretical interpretation of those results, and theoretical models of neutrino masses and mixings. The book concludes with an examination of the potential of long-baseline experiments. This is an essential reference text for workers in elementary-particle physics, nuclear physics, and astrophysics.