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
We study the spontaneous breaking of diffeomorphism invariance using the proper-time non-perturbative flow equation in quantum gravity. In particular, we analyze the structure of the UV critical manifold of conformally reduced Einstein-Hilbert theory and study…
We study the effects that a √ −FµνFµν in the action can have and we find, 1. Combined with a Maxwell term −FµνFµν it gives a confining behavior. 2. adding a ¨mass term¨AµAµ , a source genrates a Coulomb component with asymptotic strength independent of the cha…
Our Galactic Center (GC) is the closest and most accessible galactic nucleus, which provides us with the unique opportunity to conduct resolved star formation studies in extreme environments. Despite the need for very high gas densities to overcome the tidal f…
The search and characterization of the electromagnetic counterparts of gravitational wave emitters requires the collaborative efforts of researchers with both theoretical and observational expertise extending over the full range of the electromagnetic spectrum…
Observation of cosmic gamma-rays in the MeV range have long been considered both promising and challenging. The challenges directly result from the physics of the photon-matter interaction at these energies, being dominated by incoherent Compton scattering, fo…
The collapse of a spherically symmetric ball of dust has been intensively studied in Loop Quantum Gravity (LQG). From a quantum theory, it is possible to recover a semiclassical regime through a polymerization procedure. In this setting, general solutions to t…
To describe the dark side of the Universe, we adopt a novel approach where dark energy is explained as an electrically charged majority of dark matter. Dark energy, as such, does not exist. The Friedmann equation at the present time coincides with that in a co…
For the first time in the literature, a dark matter (DM) halo model based on first physical principles such as (quantum) statistical mechanics and thermodynamics is used to try to reproduce 6D phasespace observations in stellar streams. We model both DM haloes…
Stochastic (i.e. the achromatic component of timing noise unrelated to interstellar propagation) and secular variations in the spin frequency ν of a rotation-powered pulsar complicate the interpretation of the measured second derivative of the spin frequency ν…
Forty years ago, Witten suggested that dark matter could be composed of macroscopic clusters of strange quark matter. This idea was very popular for several years, but it dropped out of fashion once lattice QCD calculations indicated that the confinement/decon…
Strange-quark matter (SQM) may be the true ground state of hadronic matter. In this case,the observed pulsars may actually be strange stars, but not neutron stars. According to the SQM hypothesis, the existence of a hydrostatically stable sequence of SQM stars…
Most domains of science are experiencing a paradigm shift due to the advent of a new generation of instruments and detectors which produce data and data streams at an unprecedented rate. The scientific exploitation of these data, namely Data Driven Discovery,…
Current small scale cosmological controversies are coming down to the precision level of observations. The key point is whether a better understanding of baryonic physics, dark matter physics, or both is required to address these challenges. In this talk, I wi…
All particles created through the Hawking process have to be generated in the collapsing object. The black hole internal states should be related to the precollapsed state (a one-to-one correspondence between the internal state and precollapse configuration).…
In this talk I will present the evolution of perturbations in a sub-class of Horndeski models characterised by shift symmetry, considering a very general parametrisation of the background. I will show how the free background parameters affect the evolution of…
The GW-Universe Toolbox is a software package designed to simulate observations of various types of gravitational wave (GW) source populations using a wide range of GW detectors, including ground-based and space-based laser interferometers, as well as pulsar t…
The aim of our work is to study the origin of the spectral transitions of transient black hole binaries. In this work, we find signatures of spectral state transition (hard to soft state) while studying the radiative shock for the accretion flow. The gradient…
We develop a framework to study the properties of mass outflows from a relativistic, viscous, magnetized, advective accretion flow around a rotating black hole (BH). While doing so, we assume that the disk is mainly threaded by the toroidal component of magnet…
We investigate the properties of relativistic accretion flow in a Kerr-Taub-NUT (KTN) spacetime in presence or absence of shock waves. This spacetime, characterized by the spin parameter or Kerr parameter (ak) and the gravitomagnetic charge or NUT parameter (n…
In this talk, I will summarize the results presented during the Parallel session focused on the AMS- 02 experiment on the International Space Station, together with their interpretation. In particular, I will discuss the latest flux measurements. The precision…
Over more than a decade, along with my group members I have been exploring the possible violation of Chandrasekhar mass-limit significantly and possible new mass-limit(s). They are indirectly supported by some observations of peculiar type Ia supernovae. The p…
We present a superfluid dark star model consisting of relativistic dark bosons with two-body selfinteraction. The obtained masses, radii, and tidal deformability depend in a simple way on the boson mass and interaction strength. We report first results on bina…
Magnetic fields in regions of strong gravity play a crucial role in the explanation of various astrophysical phenomena, such as e.g. the formation and collimation of relativistic jets observed in black hole systems of different mass scales. In this presentatio…
Supernova gravitational waves are the next candidates to those from the compact binary mergers. The gravitational waves generally depend on the supernova models, such as the progenitor mass and equation of state (EOS) for a higher-density region. So, even if o…
Ultraluminous X-ray sources are the X-ray binaries with X-ray luminosity exceeding the Eddington limit of a 10 solar mass black hole. Recent consensus is that these sources are powered mainly by super-Eddington accretion onto stellar-mass compact objects. An i…