High Energy Neutrinos from Gamma Ray Bursts: Theoretical Predictions, Experimental Searches, and Prospects for Detection


Book Description

Abstract Gamma-ray bursts (GRBs) are the most luminous transient events in the observed Universe. However, there is no direct observational evidence for what exactly drives a GRB. The most widely accepted model for these cosmic events is the fireball model where it is thought that a substantial fraction of the kinetic energy of the source is converted to gamma-radiation by shock accelerated electrons emitting synchrotron and inverse-Compton radiation. The acceleration of protons in the gamma-ray emitting region of the GRB has been hypothesized as well. In this hadronic acceleration model, it is predicted that protons may interact with gamma-ray photons to produce a burst of neutrinos at energy ∼10^14 eV during prompt emission and energy ∼10^18 eV during afterglow emission. Several experimental searches for these high energy neutrinos have been conducted and no GRB neutrinos have yet been found. The analytical prediction for neutrino flux has been replaced with a more thorough numerical prediction for neutrino flux. The neutron model of GRBs, where only neutrons can escape the GRB and reach Earth as cosmic rays, has been ruled out by the experimental work of IceCube and ANTARES. Upgraded versions of current experiments such as IceCube, ANTARES, ANITA and ARA, as well as new experiments such as KM3NeT, are preparing to probe and further constrain the fireball paradigm of GRB neutrino production. This review includes: Introduction Early theoretical predictions for neutrino fluences due to GRBs Overview of high energy neutrino experiments and related physics Experimental searches for high energy neutrinos from GRBs Prospects for detection of high energy neutrinos from GRBs High Energy Neutrinos from Gamma Ray Bursts: Theoretical Predictions, Experimental Searches, and Prospects for Detection was originally written as a review submitted for my Ph.D. candidacy paper on Nov 23, 2015. It has been edited for a "Short Read" on Amazon Kindle Direct Publishing in Oct 2020. It is a public domain work. Special thanks to the Connolly group at Ohio State University (OSU) and the physics and astronomy departments at OSU. Moreover, I am grateful for the contribution of each and every scientist and author listed in the "References" section of this review. This review would not be possible without their published science and hard work. Please let me know if you find any mistakes or problems, I will fix it. My email is [email protected]. I am happy for this to be a living document. I am anxious to improve it but feel that it needs to be out at this point before that can happen.




A Search for High-energy Neutrino Emission from Gamma-ray Bursts


Book Description

A century after their discovery, the origin of cosmic rays remains one of the most enduring mysteries in physics. They can have energies that exceed 1020 eV, a hundred million times as energetic as the most powerful Earth-bound particle accelerators and must therefore be produced in the universe's most violent environments. Direct observation of their origins, however, has proven difficult due to deflection of charged cosmic ray particles in galactic and intergalactic magnetic fields, obscuring their true origins. Astronomy using electrically neutral particles, such as photons and neutrinos, does not, however, share this difficulty. This work presents a search for neutrino emission from one of the primary candidates for the sources of the highest-energy cosmic rays, Gamma-Ray Bursts, using the recently-completed IceCube neutrino telescope located at the South Pole. The null result obtained from this search contradicts well-established predictions for the neutrino flux from Gamma-Ray Bursts if they are the cosmic ray sources, forcing a reevaluation of these theoretical models.










High Energy Neutrino Telescopes


Book Description

We will review the scientific case for neutrino astronomy. It has been made since the 1950's by pioneers who realized that, of all high-energy particles, only neutrinos can directly convey astrophysical information from the edge of the Universe and from deep inside its most cataclysmic high-energy regions near black holes. With the Antarctic Muon And Neutrino Detector Array (AMANDA), we have performed the first scans of the sky using neutrinos of TeV-energy and above as cosmic messengers. We will discuss the search for neutrino emission from gamma-ray bursts and active galaxies, which are known sources of high-energy gamma-rays. We searched with improved sensitivity for magnetic monopoles, and for a cold dark matter signal from the center of the Earth. Most importantly, by observing neutrinos produced by cosmic rays in the Earth's atmosphere we present a proof of concept for an expandable technology with which to build the ultimate kilometer-scale neutrino observatory, IceCube.




High Energy Neutrinos from Gamma-ray Bursts


Book Description

Neutrino astronomy began with the detection of solar neutrinos, supernova neutrinos(SN1987A) and more recently the 37 events in IceCube which are very likelyto be an astrophysical origin. The result from IceCube is perhaps the most excitingdiscovery of the year 2013, capping a several decades long search. Variousastrophysical candidates have been proposed as sources of high energy neutrinos,although the origin of the IceCube neutrinos remains a mystery. Gamma-raybursts (GRBs), the most energetic explosions in the universe, were considered asthe most promising source for high energy cosmic rays and neutrinos (with AGNs).However, a previous search of GRB neutrinos by IceCube surprised the GRB communitywith negative results, challenging the simple standard picture of GRBprompt emission which is called the \internal shock" model. In this thesis we givea closer investigation of this model as well as several leading alternative models.With a careful consideration of the particle physics and the model parameters weshow that the previous negative result with GRB neutrinos is not surprising, andonly those models with extremely optimistic parameters can be ruled out. Wepredict that GRBs are unlikely to be the sole sources of the IceCube events, butsignals of GRB neutrinos may be detected in the near future, with the neutrinotelescopes such as IceCube/DeepCore, KM3Net, ARA, ARIANNA, ANITA etc.




High Energy Astrophysical Neutrinos


Book Description

This book provides a pedagogical introduction to the likely sources of these neutrinos, their propagation and detection mechanisms. Detection of high energy neutrinos of extragalactic origin has led to an interdisciplinary field of research, involving astronomy, astrophysics and particle physics. An extensive review of various detectors and the observations is provided that consolidates the latest findings. Above a few tens of TeVs, neutrinos are conceived as more reliable messengers for astronomy than photons as these photons get absorbed in the background photon field. Determining the neutrino spectrum not only helps in exploring astrophysical objects like AGN, GRB, etc. but also allows us to study particle physics at unprecedented energies. This introductory book is intended to help advanced undergraduate and graduate students to get into the subject with ease, and it simultaneously caters to practicing theoretical or experimental physicists as a reference book.




New Prospects for High-energy Neutrinos from Gamma-ray Bursts


Book Description

High-energy neutrinos from Gamma-Ray Bursts (GRBs) have been expected since the pre-Swift era. Such signals may be detected by future large neutrino detectors such as IceCube. Recently Swift has shown several novel phenomena. We suggest the new prospects for high-energy neutrino emission in the Swift era. Expected signals, if detected, are useful for revealing of the nature of GRBs.




Gamma-ray and Neutrino Signatures of Galactic Cosmic-ray Accelerators


Book Description

This book addresses three “hot” topics concerning the general problem of the origin of Galactic cosmic rays, namely (1) the acceleration, propagation, and radiation of particles in supernova remnants; (2) very high energy neutrinos from the Galactic Center; and (3) the potential held by the next-generation gamma-ray and neutrino detectors CTA and KM3NeT for studying extended non-thermal sources in the Galaxy. The topics are intrinsically connected to determining the nature (“hadronic or leptonic?”) of gamma-ray emissions from young and middle-aged supernova remnants and the search for cosmic-ray PeVatrons. The results and conclusions provided here are based on extensive analytical and numerical simulations, which are formulated and presented in a straightforward format that can be readily used in the interpretations of gamma-ray and neutrino observations, as well as for confident predictions for future measurements.




The Physics of Gamma-Ray Bursts


Book Description

A complete text on the physics of gamma-ray bursts, the most brilliant explosions since the Big Bang.