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EuCAPT White Paper: Opportunities and Challenges for Theoretical Astroparticle Physics in the Next Decade

R. Alves Batista, +131 more
TLDR
The European Consortium for Astroparticle Theory (EuCAPT) white paper as mentioned in this paper explores upcoming theoretical opportunities and challenges for our field of research with particular emphasis on the possible synergies among different subfields, and the prospects for solving the most fundamental open questions with multi-messenger observations.
Abstract
Astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with IceCube, the direct detection of gravitational waves with LIGO and Virgo, and many others. This white paper is the result of a collaborative effort that involved hundreds of theoretical astroparticle physicists and cosmologists, under the coordination of the European Consortium for Astroparticle Theory (EuCAPT). Addressed to the whole astroparticle physics community, it explores upcoming theoretical opportunities and challenges for our field of research, with particular emphasis on the possible synergies among different subfields, and the prospects for solving the most fundamental open questions with multi-messenger observations.

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Citations
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Journal Article

The Observation of Gravitational Waves from a Binary Black Hole Merger

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Bow-Shock Pulsar Wind Nebulae Searches Aided by the North American Nanohertz Observatory for Gravitational Waves

TL;DR: The North American Nanohertz Observatory for Gravitational Waves (NANOW) is a collaboration of researchers who are actively engaged in using North American radio telescopes to detect and study gravitational waves (GWs) via pulsar timing.

Oscillons after Inflation

TL;DR: In this article, it was shown that in a class of well-motivated single-field models, inflation is followed by self resonance, leading to copious oscillon generation and a lengthy period of oscillon domination.

A Reverse Shock in GRB 130427A

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A response to O. Arandjelovic's critique of "The reproducibility of research and the misinterpretation of p-values"

TL;DR: The main criticism of my piece in this article seems to be that my calculations rely on testing a point null hypothesis, i.e. the hypothesis that the true effect size is zero.
References
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Dark Compact Planets

TL;DR: In this paper, the authors investigate compact objects formed by dark matter admixed with ordinary matter made of neutron-star matter and white-dwarf material, and obtain dark compact planets with Jupiter-like masses and radii of few hundred Km.
Journal ArticleDOI

Magnetic reconnection and hot-spot formation in black-hole accretion disks

TL;DR: In this paper, the authors perform axisymmetric general-relativistic resistive magnetohydrodynamics simulations to model reconnection and plasmoid formation in a range of accretion flows and find that only hot spots forming in magnetically arrested disks can potentially explain the energetics of Sgr A* flares.
Posted Content

Scratches from the Past: Inflationary Archaeology through Features in the Power Spectrum of Primordial Fluctuations

TL;DR: Inflation may provide unique insight into the physics at the highest available energy scales that cannot be replicated in any realistic terrestrial experiment as discussed by the authors, and features in the primordial power spectrum are generically predicted in a wide class of models of inflation and its alternatives.
Journal ArticleDOI

Observing invisible axions with gravitational waves

TL;DR: In this paper, the Peccei-Quinn symmetry associated to an axion has been restored after inflation and axion strings inevitably produce a contribution to the stochastic gravitational wave background.
Posted Content

Baby Universes, Holography, and the Swampland

TL;DR: In this article, it was shown that the Hilbert space of the universe states must be one-dimensional in a consistent theory of quantum gravity, and the role of an ensemble in holographic theories in the context of theories of quantum quantum gravity in $d = 2$ (such as JT gravity and possible cousins in$d = 3$), which are incomplete physical theories that should be viewed as branes in a higher dimensional theory of QG for which an ensemble plays no role.
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