本次会议共收录 601 篇报告,分布于 60 个分会。可按标题、作者或正文关键词检索。
共 601 条结果
ZAIGA (the Zhaoshan long-baseline Atom Interferometer Gravitation Antenna) is a proposed underground long-baseline atom interferometer (AI) facility, aiming for experimental research on gravitation and related problems. It includes gravitational wave detection…
Abstract. Since the work of Kaluza it has been known that Maxwell’s equations are mathematically a subset of the Ricci curvature tensor in five dimensions. In the present paper a complete set of equations for the 5D Ricci curvature tensor is described that rep…
Thanks to its all-sky coverage, the Planck mission had the unique capability of detecting the brightest strongly lensed high-z galaxies in the sky. The combination of boosted luminosity and stretching of images offers a unique opportunity to pierce into their…
We present a proof of concept for an alternative method of strong gravitational lens finding using a conditional Generative Adversarial Network (cGAN). We use Early Release Observation (ERO) images of the Perseus Cluster from Euclid, covering 0. 57sq.degrees o…
There is an open debate about whether some galactic centers (including Sgr A*) could actually be supermassive dark matter cores made of fermions with masses in the range of 60-350 keV. We discuss the possibility of pinpointing mergers of such cores using mHz g…
We develop a non-conventional description of the vacuum energy in quantum field theory in terms of quantum entropy. Precisely, we show that the vacuum energy of any non-interacting quantum field at zero temperature is proportional to the quantum entropy of the…
The possibility that the vacuum energy density (VED) could be time dependent in the expanding Universe is intuitively more reasonable than just a rigid cosmological constant for the entire cosmic history. The framework of the running vacuum model (RVM) is a re…
This talk presents a new avenue to black hole evaporation using a heat-kernel approach in the context of effective field theory analogous to deriving the Schwinger effect. Applying this method to an uncharged massless scalar field in a Schwarzschild spacetime,…
In this talk we show that the relevant physical information in the construction of a vacuum state is encoded in the selection of a Lagrangian subspace of the space of complexified solutions. In particular we show the existence of a one-to-one correspondence be…
Observations by Planck indicate that CMB anisotropies are consistent with predictions of nearly Gaussian primordial perturbations as the one generated in slow roll inflation. On the other hand, loop quantum cosmology (LQC) generates a non-Gaussian bispectrum.…
A thin circular structure vibrating in the central plane of a black hole will be investigated. This circular ring (string loop) can be considered a simplified model for thin magnetic flux tubes (in plasma physics), and connections to accreting fluid structures…
In this work, we construct the Raychaudhuri equation in f(R̄, T̄) gravity in the context of a noncanonical theory, which is the K-essence theory. We solved the modified Raychaudhuri equation for the additive form of f(R̄, T̄), which is f1(R̄) + f2(T̄). In this…
The radio pulsar PSR J0901-4046 exhibits very slow rotation with a spin period 76 s, which is unusually low for a neutron star. Typically the spin period of radio pulsars ranges 1.4 ms to 23.5 s, when they are divided into various sub-classes, e.g. transient,…
We calculate the effect of dark matter on the ringdown waveform and shadow of supermassive black holes at the core of galaxies. Our main focus is on the supermassive black hole at the core of M87, which is large enough to allow for viable observational data. W…
There are evidences for neutron stars (NSs) with the rotational frequency of several 100th of Hz and moderate magnetic fields, though magnetars are slowly spinning. Hence, if their magnetic and rotating axes are misaligned (nonzero obliquity angle), hence they…
It is known that all wormholes violate classical energy conditions, non-negativity constraints on contractions of the stress-energy tensor. Since these conditions are violated by quantum fields, it was believed that wormholes can be constructed in the context…
In this work we analyze traversable wormhole spacetimes in the framework of a covariant generalization of Einstein’s General Relativity known as energy-momentum squared gravity. Here, we show that a wide variety of wormhole solutions for which the matter field…
The NICER (Neutron star Interior Composition ExploreR) X-ray telescope on the International Space Station can provide a powerful approach to the magnetar and FRB connections using its large effective area and prompt follow-up observation of transients. Our NIC…
Molecular clouds in the Galactic Center reprocess radiation from past outbursts, generating a strong Fe Kα fluorescent line (6.4 keV). Reflecting the radiation that reaches them as mirrors, these clouds retain the historical activity of their illuminating sour…
The X-ray spectra of isolated neutron stars (INSs) typically include a thermal component, that comes from the cooling surface, and a non-thermal component, produced by highly-relativistic particles accelerated in the stellar magnetosphere. Hot spots from retur…
The X-ray spectra of isolated neutron stars (INSs) typically include a thermal component, that comes from the cooling surface, and a non-thermal component, produced by highly-relativistic particles accelerated in the stellar magnetosphere. Hot spots from retur…
We present the Imaging X-ray Polarimetry Explorer (IXPE) observation of the gamma-ray burst (GRB) 221009A, which reached Earth on October 9, 2022. Although IXPE was not originally designed for this purpose, the exceptional brightness of GRB 221009A allowed it…
The launch of the IXPE telescope in late 2021 finally made polarization measurements in the 2-8 keV band a reality, more than 40 years after the pioneering observations of the OSO-8 satellite. In the first two years of operations, IXPE targeted more than 60 so…
Recently, a previously quiescent nearby galactic nucleus, ASASSN-20qc, went to an outburst during which it has shown quasioperiodic ultra-fast outflows (qUFOs) with changing column density every cca 8 days. Different physical mechanisms have been proposed to e…
I observe that some of the key challenges faced by quantum-gravity research, and particularly by quantum-gravity phenomenology, can be traced back to grey area of our understanding of the interface between quantum mechanics and special relativity…