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6/1/23, 12:55 PM
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Jessica Turner6/1/23, 1:00 PM
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Sarif Khan (ITP, University of Goettingen)6/1/23, 2:00 PMTalk
The indirect searches of Dark Matter (DM), in conjugation with the
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so called `missing track searches' at the collider seems to confine fermion
triplet DM mass within a narrow range around $1$ TeV. The canonical picture of
pure triplet fermionic dark matter is in tension since it is under-abundant for
the said mass range. Several preceding studies have shown that the existence of
an extra... -
Emanuele Copello (JGU Mainz)6/1/23, 2:20 PMTalk
We study the production of Dark Matter (DM) in a minimal freeze-in model during inflationary reheating. We analyze the case where a heavier parent particle decays into DM and a Standard Model fermion in two reheating scenarios: bosonic reheating (BR) and fermionic reheating (FR). We show that for a low reheating temperature, BR and FR scenarios predict different lifetimes and masses for the...
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Maximilian Berbig (Bethe Center for Theoretical Physics (BCTP), Physikalisches Institut, Uni Bonn)6/1/23, 3:10 PMTalk
Dirac Leptogenesis is a viable scenario that connects the observed baryon asymmetry of our universe to the possibility that neutrinos are Dirac fermions. After reviewing the basic ingredients of this approach we present two models for parametrically small Dirac neutrino masses. Both constructions also allow for the generation of a lepton asymmetry from out-of-equilibrium particle decays, that...
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Yannis Georis (Université catholique de Louvain (UCLouvain))6/1/23, 3:30 PMTalk
While the Standard Model (SM) has been extremely successful, it fails to explain the origin of neutrino masses and of the baryon asymmetry of the universe. Extending the SM with right-handed neutrinos in the type-I seesaw framework provides the necessary ingredients to solve both of these problems. In addition, one can predict the PMNS angles and other low-energy parameters if we endow the...
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Jinglan Zheng6/1/23, 3:50 PM
LoTSS (LOFAR Two-meter Sky Survey) is one of the major surveys conducted by the LOFAR(Low Frequency Array) network. It is a large-scale project aimed at creating deep, high-resolution radio maps of the northern sky at low frequencies. We present the work of the cosmology group in the LOFAR Surveys Key Science Projects: the count-in-cell statistics of the LoTSS sources(Pashapourahmadabad et...
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Jonah Wagenveld6/1/23, 4:10 PM
The cosmic radio dipole is an anisotropy in the number counts of radio
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sources, analogous to the dipole seen in the cosmic microwave background
(CMB). Measurements of the radio dipole with large radio surveys have
shown that though the radio dipole is aligned in direction with the CMB
dipole, the amplitudes are in tension. These observations present an
intriguing puzzle as to the cause of... -
Ziad Sakr6/1/23, 4:30 PM
Constraints on LCDM and beyond are usually obtained assuming, with different degrees, an underlying model, and that either on the level of the measurements or on the modeling of the systematics or when calculating parts of the theoretical outcomes for models beyond the fiducial one. In this talk we present some of our attempts to extract from the cosmological data information that are as much...
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Philipp Klose (Bern University)6/1/23, 5:20 PM
We revisit the framework of axion-like inflation and consider a warm inflation scenario in which the inflaton couples to the topological charge density of non-Abelian gauge bosons whose self-interactions result in a rapidly thermalizing heat bath. Including both dispersive (mass) and absorptive (friction) effects, we find that the system remains in a weak regime of warm inflation (thermal...
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Isak Stomberg (DESY)6/1/23, 5:40 PMTalk
A stochastic gravitational wave background of cosmological origin is an intriguing possibility to be probed by gravitational wave detectors such as pulsar timing arrays and LISA in the near future. In this talk, I will present a novel “Higgsless” simulation to predict the stochastic gravitational wave spectrum from first-order phase transitions in the early universe. I will present results for...
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Alessandro Lenoci (DESY)6/1/23, 6:00 PMTalk
The adiabatic growth of a central massive black hole could compress the surrounding dark matter halo, leading to a steeper profile of the dark matter halo. This phenomenon is called adiabatic compression. We investigate the adiabatic compression of wave dark matter - a light bosonic dark matter candidate with its mass smaller than a few eV. Using the adiabatic theorem, we show that the...
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Tobias Schröder (Institute for Theoretical Physics, University of Münster)6/1/23, 6:20 PMTalk
In recent years, the asymptotic structure of gravity and gauge theories has been studied extensively. This was, however, done almost exclusively for (asymptotically) flat spacetimes with a few exceptions.
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In this talk, I will give an overview of the asymptotic structure of electrodynamics in certain FLRW spacetimes. I will first introduce asymptotic symmetries and then show their relation to... -
Richard von Eckardstein (Institute for Theoretical Physics, University of Münster)6/2/23, 9:00 AMTalk
Axion inflation is an attractive particle physics model of inflation with a rich phenomenology, due to the parity violating production of gauge-fields in this model, which may have implications for the production of gravitational waves, scalar perturbations and the baryon asymmetry. In recent years, a scenario with strong back-reaction of the gauge fields onto the inflaton in this model has...
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Mubarak Abdallah (UCLouvain-CP3)6/2/23, 9:20 AMTalk
The behavior of scalar fields in a thermal plasma plays an important role in the study of the early universe, and it is relevant for addressing problems in astrophysics and cosmology. In this talk, we present a calculation of the dissipation rate in a simple scalar model at a finite temperature. We discuss the impact of thermal masses on the quasi-particle kinematics and show the different...
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Aleksandr Chatrchyan (DESY, Hamburg)6/2/23, 9:40 AMTalk
Light scalar fields, such as axions, can play an important role in cosmology. In this talk I will discuss the mechanism of cosmological relaxation of the electroweak scale, which provides a dynamical solution to the Higgs mass hierarchy problem. In the simplest model, the Higgs mass is scanned during inflation by a light field, the relaxion, whose slow-roll dynamics selects a naturally small...
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Guillem Domenech6/2/23, 10:30 AM
Primordial black holes are often assumed to form by the collapse of large primordial fluctuations. However, it might not be the only channel. Yukawa forces are attractive, and they can be much stronger than gravity, leading to an instability similar to gravitational collapse in the early universe. I will present recent advancements on the growth of fluctuations in the very early universe from...
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Stefan Zentarra (ETH Zürich)6/2/23, 10:50 AMTalk
It is common physics knowledge that the N-body problem cannot be solved analytically for $N>2$. Indeed, it has been proven that for general initial conditions the particle trajectories can not be expressed in terms of elementary functions. However, if we consider different observables, e.g., density n-point functions, this theorem does not directly apply. Moreover, when working with such...
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Lukas Gülzow (Karlsruhe Institute of Technology - Institute of Astroparticle Physics)6/2/23, 11:10 AMTalk
Recent Gaia observations suggest that some hypervelocity stars (HVSs) might originate from outside the Galaxy. We ask if these HVSs could come from as far as Andromeda. Therefore, we simulate HVSs originating in Andromeda with initial conditions based on attributes of high velocity stars measured in the Milky Way and a simple model for the gravitational potential of Andromeda and the Milky...
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Fabian Schmidt6/2/23, 12:00 PM
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Francesco Costa (ITP, University of Goettingen)
We present a Spin 3/2 FIMP dark matter (DM) candidate. FIMP dark matter is produced via the freeze-in mechanism that
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generally implies tiny coupling between the DM and the standard model particles, making DM direct detection and
collider searches almost hopeless. This is not the case for a spin 3/2 DM at low reheating temperature, where direct
detection and collider bounds play a... -
Jessica TurnerTalk
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Philipp Schicho (Goethe University Frankfurt)Talk
Beyond the Standard Model (SM) physics is required to explain both dark matter (DM) and the baryon asymmetry of the universe, the latter possibly generated during a strong first-order electroweak phase transition. While many proposed models tackle these problems independently, it is interesting to inquire whether the same model can explain both. Here, I focus on a DM model featuring an inert...
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