Academic Articles & Research Papers

Theoretical Astrophysics

This volume provides comprehensive coverage of all aspects of cosmology and extragalactic astronomy at an advanced level. Beginning with an overview of the key observational results and necessary terminology, it goes on to cover important t...

Frontiers of Astrophysics

Eugene H Avrett (ed) London and Cambridge, Mass: Harvard University Press 1976 pp vi + 554 price £15 This is very much the Harvard view of the universe – not just the editor but most of the contributors are associated with Harvard Universit...

Astrophysics for Physicists

1. Introduction 2. Interaction of radiation with matter 3. Stellar astrophysics I: basic theoretical ideas and observational data 4. Stellar astrophysics II: nucleosynthesis and other advanced topics 5. End states of stellar collapse 6. Our...

Astronomy and Astrophysics

A star is by definition a celestial object, bound by self-gravity, in which thermal energy is produced from a nonthermal source (nuclear reactions) and is radiated outward from the object’s surface to its surroundings. We shall extend this ...

Astronomy and astrophysics

Exploring Ru 4d oxide Ba2XRuO6 (X = Y, Lu, Sc) for spintronics: pressure-dependent first-principles study

Recent advances in the precise control of electromagnetic and transport properties, and the miniaturization of electronic devices, have introduced new prospects in the development of practical quantum computing. Double perovskites have gain...

Detection of Majorana zero mode in the vortex

Abstract Majorana zero modes, which behave like Majorana fermions, are quasiparticle excitations in condensed matter systems. They obey non-Abelian statistics, and have been proposed as building blocks of topological quantum computers. They...

Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

Topological superconducting systems are expected to exhibit a range of exotic physics which are particularly useful for application in quantum computing technologies. Here, the authors report the synthesis of LaNiGa2 which exhibits both top...

Interplay between charge-density-waves, disorder, and superconductivity in transition metal dichalcogenides

Transition metal dichalcogenides (TMDs) are a fascinating class of materials known for their various electronic properties and potential applications in nanoelectronics, quantum computing, and energy storage. This review explores the intric...

Pegasus: A Framework for Mapping Complex Scientific Workflows onto Distributed Systems

This paper describes the Pegasus framework that can be used to map complex scientific workflows onto distributed resources. Pegasus enables users to represent the workflows at an abstract level without needing to worry about the particulars...

Self-Normalizing Neural Networks

Deep Learning has revolutionized vision via convolutional neural networks (CNNs) and natural language processing via recurrent neural networks (RNNs). However, success stories of Deep Learning with standard feed-forward neural networks (FNN...

Planetary shielding and surface precipitation of solar energetic particles during BepiColombo's close Mercury flyby.

On the Dual Nature of Atmospheric Escape

Planetary atmospheres cannot remain hydrostatic at all altitudes because they approach finite density at infinite radius, implying infinite mass. Classical treatments address this in two directions: either retain a hydrostatic structure whi...

The Messy Nature of Fiber Spectra: Star–Quasar Pairs Masquerading as Dual Type 1 AGNs

Theoretical studies predict that the most significant growth of supermassive black holes (SMBHs) occurs in late-stage mergers, coinciding with the manifestation of dual active galactic nuclei (AGNs), and both major and minor mergers are exp...

An IXPE-led X-Ray Spectropolarimetric Campaign on the Soft State of Cygnus X-1: X-Ray Polarimetric Evidence for Strong Gravitational Lensing

We present the first X-ray spectropolarimetric results for Cygnus X-1 in its soft state from a campaign of five IXPE observations conducted during 2023 May–June. Companion multiwavelength data during the campaign are likewise shown. The 2–8...

A Deep SETI Search for Technosignatures in the TRAPPIST-1 System with FAST

The Five-hundred-meter Aperture Spherical Telescope (FAST) is the world’s largest single-dish radio telescope, and the search for extraterrestrial intelligence (SETI) is one of its five key science objectives. We conducted a targeted search...

Chemical and Orbital Signatures of Three Hypervelocity Stars: Constraints on the Origins

We present a chemodynamical analysis of three hypervelocity stars (HVS) selected from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope medium-resolution spectroscopic survey and Gaia. The high-resolution follow-up observation w...

Reconnaissance with JWST of the J-region Asymptotic Giant Branch in Distance Ladder Galaxies: From Irregular Luminosity Functions to Approximation of the Hubble Constant

We study stars in the J-regions of the asymptotic giant branch (JAGB) of near-infrared color–magnitude diagrams in the maser host NGC 4258 and four hosts of six Type Ia supernovae (SNe Ia): NGC 1448, NGC 1559, NGC 5584, and NGC 5643. These ...

Soft theorems for boosts and other time symmetries

Abstract We derive soft theorems for theories in which time symmetries — symmetries that involve the transformation of time, an example of which are Lorentz boosts — are spontaneously broken. The soft theorems involve unequal-time correlati...

Particles and Astrophysics