Physics / Stellar & Compact Objects
Stellar physics, compact objects, and high-energy astrophysical phenomena. Research spans black hole thermodynamics, stellar evolution, radiative processes, and accretion physics.
Stellar mass black holes accreting at a super-Eddington rate produce strong outflows and non-thermal radiation up to PeV energy. Recently, very high energy (VHE) emission was discovered from the environment of the galactic microquasar V4641 Sgr, which is known to experience super-Eddington outbursts
The existence of high-redshift quasars may indicate that massive black hole seeds formed via supermassive Population III stars in atomic-cooling halos with large gas inflow rates; however, the dependence of this process on halo assembly rate and radiative background remains poorly constrained. We pr
We study periodic orbits and the associated gravitational radiation of a magnetized (uncharged) test particle carrying a magnetic dipole moment with coupling constant beta, moving in the equatorial plane of a rotating, magnetized Kerr black hole immersed in an external asymptotically uniform magneti
Gravitational wave observations have found over 300 merging binary black holes, yet their origins remain uncertain. Recent work showed that many may come from isolated stellar binaries whose orbits shrink through stable mass transfer. If true, their spins may help to distinguish this channel from ot
On 2025 August 18, the LIGO-Virgo-KAGRA collaboration reported a sub-threshold gravitational-wave (GW) candidate, S250818k, consistent with a binary neutron star (NS) merger potentially involving a sub-solar-mass compact object. Follow-up electromagnetic (EM) observations identified a Type IIb super
Shot-noise anisotropies in the nHz gravitational wave background (GWB) are a promising target for pulsar timing arrays (PTAs). If the nHz GWB is sourced by merging supermassive black hole binaries (SMBHBs), as current evidence suggests, the shot-noise signal is expected to be large, potentially of o
The inspiral and merger of two supermassive black holes (SMBHs) releases immense energy in low-frequency gravitational waves (GWs). Recent pulsar timing array (PTA) observations of the stochastic nHz GW background (GWB) are consistent with a SMBH binary origin. GW data from PTAs and from the upcomin
We present an extensive radio monitoring campaign of the unique extragalactic transient GRB 250702B, with observations spanning 0.65-233 GHz from 6-356 d (observer frame) post-discovery. The radio emission shows a smoothly evolving peaked synchrotron spectrum consistent with an adiabatic shock expan
This thesis investigates the underexplored role of music within early Coptic literature to address a significant gap in early Christian musicology. While substantial research has been conducted on Greek, Latin, and Syriac language sources (McKinnon, 1987; Page 2010), Coptic-language texts have been
Overview This dataset provides the results of a high-fidelity cosmological simulation exploring the non-linear dynamics of a universe dominated by Primordial Black Holes (PBHs). The simulation was executed on NVIDIA Blackwell (B200) hardware at a native resolution of $2560^3$ ($16.7$ billion voxels)
This supplement extends the dimensionless predictions of the main document to absolute mass scales and cosmological observables, addressing the dimensional transmutation problem. It bridges dimensionless topological predictions to physical mass scales in GeV.
This supplement extends the dimensionless predictions of the main document to absolute mass scales and cosmological observables, addressing the dimensional transmutation problem. It bridges dimensionless topological predictions to physical mass scales in GeV.
This work presents a rigorous mathematical formulation of cosmological mechanics within the Cosmological Thermosynthesis Theory v3.2 (TTC v3.2). The theory posits that spacetime and all fundamental interactions emerge from a primordial superfluid of ultralight scalar bosons termed etherions, with ma
The third paper in a four-paper series connecting FCC lattice cohomology, Apollonian circle packing, and post-quantum cryptography. Papers 1 and 2 proved that the FCC cycle space carries a natural V4 symmetry and that the FCC primitive cell is the symmetric Apollonian seed in R³’¹, with the directed
Abstract The Unified Hyperdimensional Chrono Theory (UHCT) V.5.1.25 advances a comprehensive framework that elevates time as the primordial dimension, from which space, matter, and quantum phenomena emerge as relational constructs. This innovative theory seamlessly integrates fractional calculus for
The Spiriton CentriSpin Cyclic Cosmology (SCCC') derives the complete Standard Model, general relativity, a first-principles theory of consciousness, and cyclic cosmology from a single pre-geometric input: the torsion charge class [Q_T] in KW_1(R) = Z/2, fixed uniquely at [Q_T] = 1 by motivic K-theo