-
Florian Kühnel (MPP & LMU Munich)12/05/2023, 09:00
-
Angelo Caravano12/05/2023, 09:30
-
M. Sten Delos (Max Planck Institute for Astrophysics)12/05/2023, 09:40
-
12/05/2023, 09:50
-
Taeho Ryu (The Max-Planck Institute for Astrophysics)12/05/2023, 10:20
-
12/05/2023, 13:30
-
Jakub Klencki (ESO Garching)12/05/2023, 14:00
-
Daniel Gruen (LMU Munich)12/05/2023, 14:10
-
Martyna Chruslinska12/05/2023, 14:20
-
Henrique Rubira (TUM)12/05/2023, 14:30
-
Earl Bellinger (Max Planck Institute for Astrophysics)12/05/2023, 14:40
-
Juan Sebastian Valbuena Bermudez (LMU), Juan Sebastián Valbuena-Bermúdez (MPP & LMU, Munich)12/05/2023, 14:50
-
Jakob Knollmüller (Max Planck Institue for Astrophysics), Jakob Knollmüller (ORIGINS Data Science Lab)12/05/2023, 16:00
-
Sunmyon Chon (MPA)12/05/2023, 16:10
-
David Sweeney (The University of Sydney), David Sweeney (Sydney University)12/05/2023, 16:20
-
Julia Bodensteiner (European Southern Observatory)12/05/2023, 16:30
-
Christian Partmann12/05/2023, 16:40
-
12/05/2023, 16:50
Many accreting black holes and neutron stars exhibit rapid variability
Go to contribution page
in their X-ray light curves, termed quasi-periodic oscillations (QPOs);
The commonly observed type is the low-frequency (< 10 Hz), type-C QPOs,
thought to originate from the Lense-Thirring precession of a hot,
geometrically thick accretion flow misaligned with the black hole spin
axis. Numerous simulations in the past... -
Antoine Mérand (European Southern Observatory)12/05/2023, 17:00
-
Oleg Kaikov (MPP & LMU, Munich)12/05/2023, 17:10
-
Gia Dvali (MPP & LMU, Munich)12/05/2023, 17:20
-
Earl Bellinger (Max Planck Institute for Astrophysics)
The universe is permeated by gravitational waves that originate from a diverse array of astrophysical and cosmological sources. These waves collectively form the stochastic gravitational wave background (SGWB), the characterization of which is a major goal for numerous planned and ongoing missions, such as LIGO, Virgo, NANOGrav, and LISA. The waves comprising the SGWB are absorbed by stars...
Go to contribution page -
Taeho Ryu (The Max-Planck Institute for Astrophysics)
Extreme tidal disruption events (eTDEs) are a new type of tidal disruption event (TDE) with a very different observational signature from regular ones. In eTDEs, the disruption takes place just outside the event horizon, where relativistic gravity leads to dramatic effects. Unlike ordinary TDEs, in which the star (and post-disruption, its center-of-mass) follows a parabolic orbit, in eTDEs,...
Go to contribution page -
Sunmyon Chon (MPA)
Direct collapse black hole formation with the mass of 10^5 Msun is a promising scenario for the origin of high-redshift supermassive black holes. It has usually been supposed that the massive seeds can only form in the primordial gas since the metal enrichment enhances the cooling ability and causes the fragmentation. What actually happens in such an environment, however, has not been...
Go to contribution page -
Jakub Klencki (ESO Garching)
We are currently witnessing an unprecedented era in the exploration of stellar-mass black holes (BHs), as they can now be detected through a multitude of observational techniques. These methods range from the identification of X-ray quiet BHs through precise monitoring of a companion star's motion,examination of accreting BHs in X-ray binaries that emit energy across the entire electromagnetic...
Go to contribution page -
Daniel Gruen (LMU Munich)
In collaboration between the Dark Energy Spectroscopic Instrument (DESI), Carnegie Mellon University, and LMU, we are planning a follow-up campaign of O4 LIGO/Virgo/KAGRA events with the 2m telescope at Wendelstein Observatory. The scope is two-fold. First, we plan to record extended nightly lightcurves of known or suspected counterparts in the optical and near-infrared using the Wide-Field...
Go to contribution page -
Juan Sebastian Valbuena Bermudez (LMU)
We study the annihilation of a pair of ‘t Hooft-Polyakov monopoles due to confinement by a string. We analyze the regime in which the scales of monopoles and strings are comparable. We compute the spectrum of the emitted gravitational waves and find it to agree with the previously calculated pointlike case for wavelengths longer than the system width and before the collision. However, we...
Go to contribution page -
Henrique Rubira (TUM)
(short) Overview on simulations of stochastic GWs
Go to contribution page -
Oleg Kaikov (MPP & LMU, Munich)
Black holes are considered to be exceptional due to their time evolution and information processing. However, it was recently proposed that these properties are generic for objects, the so-called saturons, that attain the maximal entropy permitted by unitarity. We verify this connection within a renormalizable SU(N) invariant theory. We also review the concept of saturation of the universal...
Go to contribution page -
Christian Partmann
Recent observations have established that dwarf galaxies can host black holes of intermediate mass (IMBHs). With modern numerical models, we would like to test the evolutionary impact of IMBHs. Our novel subsolar-mass (0.8 solar mass) resolution simulations of dwarf galaxies have a resolved three phase ISM and account for non-equilibrium heating, cooling, and chemistry processes. The stellar...
Go to contribution page -
Angelo Caravano
If gauge fields are coupled to an axion field during inflation, they can lead to unique observational signatures, such as primordial black holes and sourced gravitational waves. However, this system often shows strong backreaction effects, invalidating the standard perturbation theory approach. In this work, we present the first nonlinear lattice simulation of an axion-U(1) system during...
Go to contribution page -
Florian Kühnel (MPP & LMU Munich)
What is the nature of dark matter? This unknown part of the Universe's content is to the best of our current understanding about five times as abundant as ordinary matter. Despite decades of intense research, its characteristics still remain mysterious. Yet, it is essential for explaining the structure in our Universe. The usual assumption is that the dark matter comprises weakly-interacting...
Go to contribution page -
M. Sten Delos (Max Planck Institute for Astrophysics)
Primordial black holes (PBHs) form from large-amplitude initial density fluctuations and may comprise some or all of the dark matter. If PBHs have a broadly extended mass spectrum, or in mixed PBH-particle dark matter scenarios, the extreme density fluctuations necessary to produce PBHs also lead to the formation of a much greater abundance of dark matter minihalos that could form even before...
Go to contribution page -
Jakob Knollmüller (ORIGINS Data Science Lab)
We introduce the Resolve method, a Bayesian approach for radio-interferometry that employs Variational Inference and Gaussian Processes. This method enables robust uncertainty quantification and advanced multi-domain imaging, essential for black hole studies. We demonstrate Resolve's effectiveness by confirming the Event Horizon Telescope (EHT) Collaboration's results on the supermassive black...
Go to contribution page -
Martyna Chruslinska
We are now routinely detecting gravitational waves (GW) emitted by merging black holes and neutron stars. Those are the afterlives of massive stars that formed all across the Universe - at different times and with different metallicities (i.e. abundances of elements heavier than helium).
Go to contribution page
Birth metallicity plays an important role in the evolution of massive stars.
Consequently, the population... -
David Sweeney (The University of Sydney)
A new 4-dimensional model describing the Galactic distribution of neutron stars (NSs) and black holes (BHs). The compact remnants created as stars die in supernova explosions — the Galactic Underworld — are found to exhibit a fundamentally different distribution and structure to the visible Galaxy. Our simulated distribution of NSs and BHs is significantly less concentrated into a thin disk,...
Go to contribution page -
Julia Bodensteiner (European Southern Observatory)
One of the main uncertainties in understanding the pathway of stars becoming gravitational-wave sources according to the isolated binary channel are binary interaction physics. Important constraints, such as on the mass-transfer efficiency or the spin-up of the mass-gaining star, that determine the future evolution of the system, are lacking. Those can be provided by detecting and...
Go to contribution page -
Erik Curiel (MCMP (LMU Munich)/BHI (Harvard))
I give a heuristic overview of the emission of radiation by black holes when quantum effects are taken into account---the "Hawking effect". I shall not work through any particular derivation of the effect in detail, as the rough, intuitive ones tend to be badly misleading, and the precise, rigorous ones are too technically demanding given the constraints of this talk. I shall rather sketch...
Go to contribution page -
Erik Curiel (MCMP (LMU Munich)/BHI (Harvard))
-
Antoine Mérand (European Southern Observatory)
Microlensing is currently the only observational method to detect isolated stellar mass black holes. However, microlensing light curve alone does not allow to disentangle the mass from the distance to the lens. Astrometric follow up of microlensing using HST has recently produced the first tangible isolated BH mass measurement, but at a large observational cost. We argue the recently...
Go to contribution page
Choose timezone
Your profile timezone: