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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Universal structure of measurement-induced information in many-body ground states
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Quantifying the accuracy of steady states obtained from the universal Lindblad equation
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Universality of the cross-entropy in Z 2 symmetric monitored quantum circuits
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Universal sublinear resistivity in vanadium kagome materials hosting charge density waves
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Subdiffusive transport in the Fredkin dynamical universality class
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Imprints of the early Universe on axion dark matter substructure
Despite considerable experimental progress large parts of the axionlike particle (ALP) parameter space remain difficult to probe in terrestrial experiments. In some cases, however, small-scale structure of the ALP dark matter (DM) distribution is strongly enhanced, offering opportunities for astrophysical tests. Such an enhancement can be produced by a period of prenucleosynthesis early matter domination (EMD). This cosmology arises in many ultraviolet completions and generates the correct relic abundance for weak coupling f a ~ 10 16 GeV , ALP masses in the range 10 - 13 eV < m a < 1 eV , and without fine-tuning of the initial misalignment angle. This range includes the QCD axion around 10 - 9 - 10 - 8 eV . EMD enhances the growth of ALP small-scale structure, leading to the formation of dense ALP miniclusters which can contain nearly all of DM (depending on ALP mass and reheating temperature). We study the interplay between the initial ALP oscillation, reheating temperature, and effective pressure to provide analytic estimates of the minicluster abundance and properties. ALP miniclusters in the EMD cosmology are denser and more abundant than in Λ CDM . While enhanced substructure generically reduces the prospects of direct detection experiments, we show that pulsar timing and lensing observations can discover these minihalos over a large range of ALP masses and reheating temperatures.
Spacetime and universal soft modes: Black holes and beyond
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Neutrino nonstandard interactions via light scalars in the Earth, Sun, supernovae, and the early Universe
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Dark matter-neutrino interconversion at COHERENT, direct detection, and the early Universe
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Mirror at the edge of the universe: Reflections on an accelerated boundary correspondence with de Sitter cosmology
An accelerated boundary correspondence (ABC) is solved for the de Sitter moving mirror cosmology. The beta Bogoliubov coefficients reveal the particle spectrum is a Planck distribution with temperature inversely proportional to horizon radius. The quantum stress tensor indicates a constant emission of energy flux consistent with eternal equilibrium, while the total energy carried by the particles remains finite. In conclusion, the curved spacetime transformation to flat spacetime with an accelerated boundary is illustrated, and also shown for anti-de Sitter (AdS) spacetime.
Holographic two-point functions in the pseudoconformal universe
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Universal logarithmic behavior in microstate counting and the dual one-loop entropy of AdS 4 black holes
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Universality driven analytic structure of the QCD crossover: Radius of convergence in the baryon chemical potential
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Sterile neutrino dark matter from generalized C P T -symmetric early-Universe cosmologies
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