Zobrazeno 1 - 10
of 154
pro vyhledávání: '"Blum, Kfir"'
Autor:
Blum, Kfir, Teodori, Luca
If ultralight boson fields exist, then vacuum misalignment populates them with nonzero relic abundance. For a broad range of particle mass $m$ the field condenses into fuzzy cores in massive galaxies. We use numerical simulations to test this idea, e
Externí odkaz:
http://arxiv.org/abs/2409.04134
Autor:
Blum, Kfir, Mirbabayi, Mehrdad
We show that quantum fluctuations of an expanding phase transition bubble give rise to gravitational wave (GW) emission, even when considering a single bubble, without bubble collisions or plasma effects. The ratio of GW energy to the total bubble en
Externí odkaz:
http://arxiv.org/abs/2403.20164
Autor:
Blum, Kfir, Rosner, Omri
We study tunneling in one-dimensional quantum mechanics using the path integral in real time, where solutions of the classical equation of motion live in the complex plane. Analyzing solutions with small (complex) energy, relevant for constructing th
Externí odkaz:
http://arxiv.org/abs/2309.07585
Autor:
Blum, Kfir
Upcoming studies at the Large Hadron Collider (LHC) aim to extend the rapidity coverage in measurements of the production cross section of antinuclei ${\rm \bar d}$ and $\overline{^3\rm He}$. We illustrate the impact of such studies on cosmic ray (CR
Externí odkaz:
http://arxiv.org/abs/2306.13165
Autor:
Teodori, Luca, Blum, Kfir
Publikováno v:
Published in: JCAP 08 (2023) 065
Massive elliptical galaxies, that serve as lenses in gravitational lensing time delay measurements of the Hubble parameter $H_0$, often reside in a host group. We consider degeneracies in the modeling of the group halo. When the group effect on imagi
Externí odkaz:
http://arxiv.org/abs/2305.19151
Publikováno v:
ApJL 932 L10 (2022)
Ultra-diffuse galaxies that contain a large sample of globular clusters (GCs) offer an opportunity to test the predictions of galactic dynamics theory. NGC5846-UDG1 is an excellent example, with a high-quality sample of dozens of GC candidates. We sh
Externí odkaz:
http://arxiv.org/abs/2202.10179
We make a number of comments regarding modeling degeneracies in strong lensing measurements of the Hubble parameter $H_0$. The first point concerns the impact of weak lensing associated with different segments of the line of sight. We show that exter
Externí odkaz:
http://arxiv.org/abs/2201.05111
Publikováno v:
Phys.Rev.D 105 (2022) 8, 083015
We look for and place observational constraints on the imprint of ultralight dark matter (ULDM) soliton cores in rotation-dominated galaxies. Extending previous analyses, we find a conservative constraint which disfavors the soliton-host halo relatio
Externí odkaz:
http://arxiv.org/abs/2111.03070
Autor:
Blum, Kfir, Teodori, Luca
Gravitational lensing time delays offer an avenue to measure the Hubble parameter $H_0$, with some analyses suggesting a tension with early-type probes of $H_0$. The lensing measurements must mitigate systematic uncertainties due to the mass modellin
Externí odkaz:
http://arxiv.org/abs/2105.10873
Publikováno v:
Phys. Rev. D 104, 043021 (2021)
We investigate what the orbits of globular clusters (GCs) in the Fornax dwarf spheroidal (dSph) galaxy can teach us about dark matter (DM). This problem was recently studied for ultralight dark matter (ULDM). We consider two additional models: (i) fe
Externí odkaz:
http://arxiv.org/abs/2102.11522