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213 papers · 1 filter
Evaluating Deep Learning Models for Multiclass Classification of LIGO Gravitational-Wave Glitches
Rudhresh Manoharan, Gerald Cleaver
Gravitational-wave detectors are affected by short-duration non-Gaussian noise transients, commonly referred to as glitches, which can obscure astrophysical signals and complicate…
Polymerized spacetime dynamics with multifield source: Unraveling the pre-inflationary Universe
Divya Gupta, Manabendra Sharma, Gustavo S. Vicente +2
We study a multifield model in loop quantum cosmology for a maximally symmetric spacetime governed by the Einstein-Hilbert action minimally coupled to scalar fields. Using a Legend…
Quantum Damping of Cosmological Shear: A New Prediction from Loop Quantum Cosmologies
Wen-Cong Gan, Leila L. Graef, Rudnei O. Ramos +2
We study the dynamics of the Bianchi I universe in modified loop quantum cosmology (mLQC-I) and uncover a robust mechanism for isotropization: the shear is dynamically suppressed a…
Effects of the ekpyrotic mechanism on inflationary phase in loop quantum cosmologies
Christian Brown, Jared Fier, Brian Phillips +2
In bouncing cosmological models, either classical or quantum, the big bang singularity is replaced by a regular bounce. A challenging question in such models is how to keep the she…
Probing modified gravitational-wave dispersion with bursts from eccentric black-hole binaries
Nicholas Loutrel, Ava Bailey, Davide Gerosa
Gravitational waves in general relativity are non-dispersive, yet a host of modified theories predict dispersion effects during propagation. In this work, we consider the impact of…
Stable initial conditions and analytical investigations of cosmological perturbations in a modified loop quantum cosmology
Rui Pan, Jamal Saeed, Anzhong Wang
In this paper, we study cosmological perturbations in a modified theory of loop quantum cosmologies, the so-called mLQC-I model. Our purposes are two-fold: First, using a method de…
Lessons from gauge fixing and polymerization of loop quantum black holes with a cosmological constant
Geeth Ongole, Parampreet Singh, Anzhong Wang
Loop quantization of Schwarzschild black holes with a cosmological constant for polymerization parameters which are constant is studied in the effective spacetime description. We s…
Fundamental Physics and Cosmology with TianQin
Jun Luo, Haipeng An, Ligong Bian +33
The exploration of the surrounding world and the universe is an important theme in the legacy of humankind. The detection of gravitational waves is adding a new dimension to this g…
Testing EGB gravity coupled to bumblebee field and black hole parameter estimation with EHT observations
Misba Afrin, Sushant G. Ghosh, Anzhong Wang
A general covariant Einstein-Gauss-Bonnet Gravity in Four-Dimensional (4D EGB) spacetime is shown to bypass Lovelock's theorem and is free from Ostrogradsky instability. Meanwhile,…
A new quantization scheme of black holes in effective loop quantum gravity
Wen-Cong Gan, Anzhong Wang
Loop quantum cosmology has achieved great successes, in which the polymerization plays a crucial role. In particular, the phase-space-variable dependent polymerization turns out to…
Interacting Models of Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity
Saddam Hussain, Simran Arora, Yamuna Rana +2
We study the dynamics of the interacting models between the Gauss-Bonnet (GB) coupled scalar field and the dark matter fluid in a homogeneous and isotropic background. A key featur…
Inner radius and energy conditions of dark matter halos surrounding Schwarzschild black holes
Zibo Shen, Anzhong Wang, Shaoyu Yin
We study a class of analytic models for a dark matter halo surrounding a Schwarzschild black hole sitting at the center of a galaxy, with a variable inner radius at…
Quasi-Normal Modes of Loop Quantum Black Holes Formed from Gravitational Collapse
Chao Zhang, Anzhong Wang
In this paper, we study the quasi-normal modes (QNMs) of a scalar field in the background of a large class of quantum black holes that can be formed from gravitational collapse of…
Universal properties of the evolution of the Universe in modified loop quantum cosmology
Jamal Saeed, Rui Pan, Christian Brown +2
In this paper, we systematically study the evolution of the Universe in the framework of a modified loop quantum cosmological model (mLQC-I) with various inflationary potentials, i…
Revisiting linear stability of black hole odd-parity perturbations in Einstein-Aether gravity
Shinji Mukohyama, Shinji Tsujikawa, Anzhong Wang
In Einstein-Aether gravity, we revisit the issue of linear stabilities of black holes against odd-parity perturbations on a static and spherically symmetric background. In this the…
A Review of Stable, Traversable Wormholes in f (R) Gravity Theories
Ramesh Radhakrishnan, Patrick Brown, Jacob Mutulevich +3
It has been proven that in standard Einstein gravity, exotic matter is required to stabilize traversable wormholes. Quantum field theory permits these violations due to the quantum…
Analytical models of supermassive black holes in galaxies surrounded by dark matter halos
Zibo Shen, Anzhong Wang, Yungui Gong +1
In this Letter, we present five analytical models in closed forms, each representing a supermassive black hole (SMBH) located at the center of a galaxy surrounded by dark matter (D…
Revisiting quantum black holes from effective loop quantum gravity
Geeth Ongole, Parampreet Singh, Anzhong Wang
We systematically study a family of loop quantizations for the classical Kruskal spacetimes using the effective description motivated from loop quantum gravity for four generic par…
Gravity-induced entanglement between two massive microscopic particles in curved spacetime: II.Friedmann- Lemaître-Robertson-Walker universe
Chi Zhang, Fu-Wen Shu
In our previous work, we have explored quantum gravity induced entanglement of mass (QGEM) in curved spacetime, observing entanglement formation between particles moving along geod…
Quantum geometric formulation of Brans-Dicke theory for Bianchi I spacetime
Manabendra Sharma, Gustavo S. Vicente, Leila L. Graef +2
This paper investigates Bianchi I spacetimes within the Jordan frame of Brans-Dicke theory, incorporating the framework of effective loop quantum gravity. After developing general…
Gravity-induced entanglement between two massive microscopic particles in curved spacetime: I.The Schwarzschild background
Chi Zhang, Fu-Wen Shu
The experiment involving the entanglement of two massive particles through gravitational fields has been devised to discern the quantum attributes of gravity. In this paper, we pre…
On the improved dynamics approach in loop quantum black holes
Hongchao Zhang, Wen-Cong Gan, Yungui Gong +1
In this paper, we consider the Böhmer-Vandersloot (BV) model of loop quantum black holes obtained from the improved dynamics approach. We adopt the Saini-Singh gauge, in which it w…
On the parameters of the spherically symmetric parametrized Rezzolla-Zhidenko spacetime through solar system tests, orbit of S2 star about Sgr A, and quasiperiodic oscillations
Sanjar Shaymatov, Bobomurat Ahmedov, Mariafelicia De Laurentis +4
In this paper, we find the higher order expansion parameters and of spherically symmetric parametrized Rezzolla--Zhidenko (PRZ) spacetime by using its functions of the radi…
Black hole scalarizations induced by parity violations
Hao-Jie Lin, Tao Zhu, Shao-Jun Zhang +1
It is well-known that parity symmetry is broken in the weak interaction but conserved for Einstein's general relativity and Maxwell's electromagnetic theory. Nevertheless, parity s…