Search

Based upon a previous axion mass proposal and detection scheme, as well as considering the axion mass ranges suggested by persuasive simulations in recent years, we present a revised axion/ALP search strategy and our calculations, concentrating on a slightly narrower axion mass (and corresponding Compton frequency) window in this report. The sole aim of this study was to provide a pin-point mass value for a resonant cavity detection scheme, and the outcome of calculations presented here reinforces the earlier mass window and the results (slightly different values from our calculations but within the same window) obtained by the calculations and simulations by Kawasaki et al. (2015) and Buschmann et al. (2020). The window comprises the spectral region of 18.99 to 19.01GHz (that falls within the Ku microwave band), with a center frequency of 19.00GHz (+0.1GHz), with equivalence to an axion mass range of 78.6 to 79.6 micro-eV, with the center mass at the value of 78.582 (+5.0) micro-eV, our suggested most likely value for an axionic/ALP field mass, if these fields exist. Our search strategy, as summarized herewith, is based upon the assumption that the dark matter that exists in the current epoch of our physical universe is dominated by axions and thus the local observable axion density is the density of the light cold dark matter, permeating our local neighborhood (mainly in the Milky Way galactic halo). Some ideas and the design of an experiment, based upon the inverse Primakoff effect, and built around a Josephson Parametric Amplifier and Resonant Tunneling Diode combination installed in a resonant RF cavity, are also some possibly novel ideas, as introduced in this report., Comment: 16 pages, 6 figures

A preliminary model of meaningful quanta of information arising from the quantum vacuum, and giving rise to the elementary quantum fields, is presented. We attempt to establish an equivalence of information and physical action, with the quanta (or packets of words) of information as a source of quantum fields (with a possible role in governing the interactions among those), similar to the quantum fields being the source of classical information. The information and quantum fields emerge in an entangled form out of the quantum vacuum, with their common underlying basis bearing intrinsically both a well-defined deterministic (geometric) and probabilistic (stochastic) structure. The description of equivalent energy of a quantum of the electromagnetic field, in terms of its information content, as well as an expression of the signal power, is provided. Various aspects of this problem and its possible implications and repercussions on our understanding of elementary quantum fields and their interactions are discussed. It is suggested that information, in a deterministic form, as well as chaotic processes within the quantum vacuum, give rise to a possible condensation of information into quantum fields., Comment: 8 pages, 1 figure used

A brief review of light dark matter particles and their spectroscopy is presented, specifically aimed at understanding the interaction mechanisms of axion and Axion-Like Particles (ALPs) with matter and an interim proposal and some ideas for possible detection of these evasive particles. In order to venture into the highly challenging spectral regions and extremely weak signals involved with these searches (especially for the DFSZ axions), a different scheme is proposed departing from the conventional resonant cavity mass scan and heterodyne detection methods. We aim to look for a fixed mass axionic field and concentrate our search at the corresponding resonant frequency and its higher harmonics using a simple phase-sensitive dc detection method, which could possibly be helpful in substantially reducing both the hardware, experiment complexities and long run times. The probable mass range suggested in the model presented here begins with 22.5microeV, corresponding to a resonant frequency of 5.4GHz, going all the way to its two multiples of 90 and 112.5microeV (corresponding to 24.3 and 27.0GHz frequencies, respectively), with high probability of finding an axion or ALP around these mass values. We present a comprehensive measurement strategy and spectroscopy technique based upon this model which revolves around a three-stage amplification and phase-sensitive detection scheme to maximize and detect a resonant axionic coupling to the U(1) fields under a coherent Primakoff effect interaction. The feasibility of proposed scheme is demonstrated with some calculations, simulations and preliminary tests. This experimental technique and ideas reported here have significant potential to be developed into an extremely sensitive narrow-range dark matter axion/ALP spectroscopy experiment., Comment: 34 pages and 13 figures

This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years., Comment: 66 pages, 15 figures, 3 tables. Workshop website and agenda: http://www-conf.slac.stanford.edu/darksectors2016/ https://indico.cern.ch/event/507783/ Editors: J. Alexander, M. Battaglieri, B. Echenard, R. Essig, M. Graham, E. Izaguirre, J. Jaros, G. Krnjaic, J. Mardon, D. Morrissey, T. Nelson, M. Perelstein, M. Pyle, A. Ritz, P. Schuster, B. Shuve, N. Toro, R. Van De Water