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The Impact Of Cold Dark Matter Variants On The Halos Of The First Stars And Galaxies: Angular Momentum And Vortex Creation In BEC Dark Matter
If cold dark matter elementary particles form a Bose-Einstein condensate, their superfluidity may distinguish them from other forms of cold dark matter, including the creation of quantum vortices. We have shown that such vortices are favored in strongly-coupled condensates. Vortex creation causes central densities to drop, thus affecting the dynamics of the gaseous baryonic component and subsequently star formation.Astronom
To observe, or not to observe, quantum-coherent dark matter in the Milky Way, that is a question
In recent years, Bose-Einstein-condensed dark matter (BEC-DM) has become a
popular alternative to standard, collisionless cold dark matter (CDM). This
BEC-DM - also called scalar field dark matter (SFDM) - can suppress structure
formation and thereby resolve the small-scale crisis of CDM for a range of
boson masses. However, these same boson masses also entail implications for
BEC-DM substructure within galaxies, especially within our own Milky Way.
Observational signature effects of BEC-DM substructure depend upon its unique
quantum-mechanical features and have the potential to reveal its presence.
Ongoing efforts to determine the dark matter substructure in our Milky Way will
continue and expand considerably over the next years. In this contribution, we
will discuss some of the existing constraints and potentially new ones with
respect to the impact of BEC-DM onto baryonic tracers. Studying dark matter
substructure in our Milky Way will soon resolve the question, whether dark
matter behaves classical or quantum on scales of kpc.Comment: 23 pages; post-proof version, minor revisions (some more discussion
on cosmological bounds and microlensing; substantially expanded list of
references); invited article to Frontiers in Astronomy and Space Sciences,
within the Research Topic "When Planck, Einstein and Vera Rubin meet. Dark
Matter: What is it? Where is it?
Rapidly Rotating Bose-Einstein Condensates in Homogeneous Traps
We extend the results of a previous paper on the Gross-Pitaevskii description
of rotating Bose-Einstein condensates in two-dimensional traps to confining
potentials of the form V(r) = r^s, . Writing the coupling constant
as we study the limit . We derive rigorously the
leading asymptotics of the ground state energy and the density profile when the
rotation velocity \Omega tends to infinity as a power of . The case
of asymptotically homogeneous potentials is also discussed.Comment: LaTex2e, 16 page
Enabling Electroweak Baryogenesis through Dark Matter
We study the impact on electroweak baryogenesis from a swifter cosmological
expansion induced by dark matter. We detail the experimental bounds that one
can place on models that realize it, and we investigate the modifications of
these bounds that result from a non-standard cosmological history. The
modifications can be sizeable if the expansion rate of the Universe increases
by several orders of magnitude. We illustrate the impact through the example of
scalar field dark matter, which can alter the cosmological history enough to
enable a strong-enough first-order phase transition in the Standard Model when
it is supplemented by a dimension six operator directly modifying the Higgs
boson potential. We show that due to the modified cosmological history,
electroweak baryogenesis can be realized, while keeping deviations of the
triple Higgs coupling below HL-LHC sensitivies. The required scale of new
physics to effectuate a strong-enough first order phase transition can change
by as much as twenty percent as the expansion rate increases by six orders of
magnitude
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