Conveners
Absolute stability of strange quark matter: from dark matter to stellar evolution: Thursday block 1
- Giuseppe Pagliara ()
- Alessandro Drago (University of Ferrara)
Absolute stability of strange quark matter: from dark matter to stellar evolution: Thursday block 2
- Alessandro Drago (University of Ferrara)
- Giuseppe Pagliara ()
Description
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/deconfinement transition, at
small baryonic chemical potential, is not first order, which seemed to
be a crucial requirement to produce large clusters of quarks. A few
recent observations on very massive (in GW190814 binary) and very light
(in supernova remnant HESS J1731-347) compact stars have renewed the
interest on the hypothesis of the absolute stability of strange quark
matter, which, if true, would have enormous consequences for our
understanding of the universe. We would like to revisit the conditions
under which strangelets can be produced in the Early Universe, the many
phenomenological implications of their existence and the most promising
techniques to detect this type of objects. This session aims at
gathering both theoreticians and experimentalists, expert on compact
stars, cosmology, cosmic rays, heavy ions in order provide a wide
overview on the present research activities on strange quark matter.
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 has been predicted, ranging from 1 to 2 solar mass strange stars, to smaller strange dwarfs and even strange planets. While...
Although calculations of QCD thermodynamics from first-principle lattice simulations are limited to zero net-density due to the fermion sign problem, several methods have been developed to extend the equation of state (EoS) to finite values of the $B,~Q,~S$ chemical potentials. Taylor expansion around $\mu_i=0~(i=B,~Q,~S)$ enables to cover with confidence the region up to $\mu_i/T=2.5$....
In the binary-driven hypernova (BdHN) scenario, long gamma-ray bursts (GRBs) originate in a binary system composed of a carbon-oxygen (CO) star and a neutron star (NS) companion in close orbit. The collapse of the CO star generates a newborn NS ($\nu$NS) at its center and a type Ic supernova (SN) explosion. Part of the SN ejecta is accreted onto the NS companion and onto the $\nu$NS by...
We present a series of numerical simulations of the pair creation process in the electrosphere of strange star using the Vlasov–Maxwell equations. The mechanism of pair creation in the electrosphere of compact objects is revisited, paying attention to evaporation of electrons and acceleration of electrons and positrons, which were previously not addressed in the literature.
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/deconfinement transition, at small baryonic chemical potential, is not first order, which seemed to be a crucial requirement in order to...
We present a superfluid dark star model consisting of relativistic dark bosons with two-body self-interaction. The obtained masses, radii, and tidal deformability depend in a simple way on the boson mass and interaction strength. We report first results on binary mergers: the distinctive amplitude and frequency of the emitted gravitational waves are well within reach of terrestrial interferometers.
The nature of dark matter is still a mystery. The possibility exists that dark matter is not made of elementary particles, but instead of “macroscopic” objects. In this class of scenarios, dubbed “macro DM”, the small interaction rates of dark matter are achieved through a small number density, as opposed to a small cross section. Examples of macro DM include clumps of strange quark matter...
In this paper, we develop a new model representing a spherically symmetric dark matter fluid sphere that could describe compact stellar objects. We consider that the compact star contains two regions namely, an isotropic inner core region with constant density and an anisotropic outer region with a specific realistic equation of state. We solve the system of field equation by assuming a...
