Maryam Aghaei Abchouyeh
A5030955750- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Noncommutative and Quantum Gravity Theories
- Atomic and Subatomic Physics Research
- Relativity and Gravitational Theory
- earthquake and tectonic studies
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
Sejong University
2021-2024
Ulsan National Institute of Science and Technology
2021
Korea University of Science and Technology
2021
Isfahan University of Technology
2012-2019
Research Institute for Astronomy and Astrophysics of Maragh
2018-2019
We report the observation of a coalescing compact binary with component masses $2.5\text{-}4.5~M_\odot$ and $1.2\text{-}2.0~M_\odot$ (all measurements quoted at 90% credible level). The gravitational-wave signal GW230529_181500 was observed during fourth observing run LIGO-Virgo-KAGRA detector network on 2023 May 29 by LIGO Livingston Observatory. primary source has mass less than $5~M_\odot$ 99% credibility. cannot definitively determine from data alone whether either is neutron star or...
Abstract We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 (all measurements quoted at 90% credible level). The gravitational-wave signal GW230529_181500 was observed during fourth observing run LIGO–Virgo–KAGRA detector network on 2023 May 29 by LIGO Livingston observatory. primary source has mass less than 5 99% credibility. cannot definitively determine from data alone whether either is neutron star or black hole. However, given...
Continuous gravitational waves (CWs) emission from neutron stars carries information about their internal structure and equation of state, it can provide tests General Relativity. We present a search for CWs set 45 known pulsars in the first part fourth LIGO--Virgo--KAGRA observing run, as O4a. conducted targeted each pulsar using three independent analysis methods considering single-harmonic dual-harmonic models. find no evidence CW signal O4a data both models upper limits on amplitude...
Weak interactions in neutron $\beta$-decay exhibit parity violation through the preferential emission of right-handed antineutrinos. We identify this symmetry breaking with a reduction phase space due to small neutrino mass. During brief interval momentum exchange, mass puts process close bifurcation horizon Rindler space, doubly covered by Minkowski ${\cal M}$ as dictated Equivalence Principle general relativity. In limit arbitrarily mass, two-sheet covering effectively collapses into...
Abstract The physical trigger powering supernovae following the core collapse of massive stars is believed to involve a neutron star (NS) or black hole (BH), depending largely on progenitor mass. A potentially distinct signature long-duration gravitational-wave (GW) bursts from BH central engines by their ample energy reservoir E J in angular momentum, far more so than an NS can provide. natural catalyst for this radiation surrounding high-density matter form nonaxisymmetric disk torus....
Lambda cold dark matter ($\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$) is increasingly facing challenges in late-time cosmology, notably the Hubble parameter $H(z)$ at redshift zero known as ${H}_{0}$-tension. Extensions to $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ have been approached mostly by models with an extra parameter. In this work, we provide a framework for evaluating viability of cosmology investigating unparticle case study. Unparticle proposes scale invariant contribution...
The double neutron star (DNS) merger event GW170817 signifies the first multimessenger (MM) with electromagnetic-gravitational (EM-GW) observations. LIGO-Virgo-KAGRA observational runs O4-5 promise to detect similar events and as yet unknown GW signals, which require confirmation in two or more detectors comparable performance. To this end, we quantify duty cycles of science quality data coincident H1L1-observations, further seek consistent rates astrophysical transients upcoming EM-GW...
Abstract The magnetar SGR 1935+2154 is the only known Galactic source of fast radio bursts (FRBs). FRBs from were first detected by Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB and Survey for Transient Astronomical Radio Emission 2 in 2020 April, after conclusion LIGO, Virgo, KAGRA Collaborations’ O3 observing run. Here, we analyze four periods gravitational wave (GW) data GEO600 detector coincident with FRB activity CHIME/FRB, as well X-ray glitches NICER NuSTAR close to time...
We propose a correspondence between an Anyon Van der Waals fluid and (2+1) dimensional AdS black hole. Anyons are particles with intermediate statistics that interpolates Fermi-Dirac Bose-Einstein one. A parameter $\alpha$ ($0<\alpha<1$) characterizes this of Anyons. The equation state for the shows it has quasi $\alpha > \alpha_c$, but $\alpha< \alpha_c$. By defining general form metric hole considering temperature to be equal fluid, we construct exact thermodynamic properties is consistent...
Dynamical behavior and future singularities of $f(R, T,R_{\mu\nu}T^{\mu\nu})$ gravitational theory are investigated. This model is a more complete form the $f(R,T)$ gravity which can offer new dynamics for universe. We investigate this case $f = R + \alpha R_{\mu\nu}T^{\mu\nu}$ using method autonomous dynamical systems by assuming an interaction between matter dark energy. The fixed points identified results consistent with standard cosmology show that small $\alpha$, radiation dominated era...
The physical trigger powering supernovae following the core collapse of massive stars is believed to involve a neutron star (NS) or black hole (BH), depending largely on progenitor mass. A potentially distinct signature long-duration gravitational wave (GW) burst from BH central engines by their ample energy reservoir $E_J$ in angular momentum, far more so than an NS can provide. natural catalyst for this radiation surrounding high-density matter form non-axisymmetric disk torus. Here, we...
The magnetar SGR 1935+2154 is the only known Galactic source of fast radio bursts (FRBs). FRBs from were first detected by CHIME/FRB and STARE2 in 2020 April, after conclusion LIGO, Virgo, KAGRA Collaborations' O3 observing run. Here we analyze four periods gravitational wave (GW) data GEO600 detector coincident with FRB activity CHIME/FRB, as well X-ray glitches NICER NuSTAR close to time one FRBs. We do not detect any significant GW emission events. Instead, using a short-duration search...
We present the results of a search for gravitational-wave transients associated with core-collapse supernova SN 2023ixf, which was observed in galaxy Messier 101 via optical emission on 2023 May 19th, during LIGO-Virgo-KAGRA 15th Engineering Run. define five-day on-source window an accompanying signal may have occurred. No gravitational waves been identified data when at least two observatories were operating, covered $\sim 14\%$ this window. report detection efficiency various possible...
Entropic force originates in the assumption that there is a horizon for universe. This gives rise to additional terms equations of motion. Using dynamical system calculations, our results show presence dark energy certain conditions, last attractor this theory will be epoch, but absence energy, entropic portion have lead role late time universe and responsible accelerated expansion that. Interestingly, assuming both their share density universe, we found that, conditions dominated epoch...
Unparticle cosmology gives an unconventional outlook on the dark sector of cosmology, increasingly challenging $\Lambda\mbox{CDM}$ by $H_0$-tension. This model derives from a finite temperature broken conformal symmetry radiation, described non-radiative correction with unknown sign in energy density. breaking has ambiguity, which corrections about IR fixed point are normal or tachyonic. While first been ruled out recent study, latter possesses late-time $T_c\simeq 4\,T_{CMB}$ associated...