scholarly journals Condensates beyond the horizons

2020 ◽  
Vol 35 (19) ◽  
pp. 2050094
Author(s):  
Jorge Alfaro ◽  
Domènec Espriu ◽  
Luciano Gabbanelli
Keyword(s):  
Black Hole ◽  
Einstein Condensate ◽  
Cosmological Horizon ◽  
De Sitter ◽  
Confining Potential ◽  
Bose Einstein Condensate ◽  
Static Black Hole ◽  
Quasilocal Energy ◽  
Forbidden Region ◽  
Bose Einstein

In this work we continue our previous studies concerning the possibility of the existence of a Bose–Einstein condensate in the interior of a static black hole, a possibility first advocated by Dvali and Gómez. We find that the phenomenon seems to be rather generic and it is associated to the presence of a horizon, acting as a confining potential. We extend the previous considerations to a Reissner–Nordström black hole and to the de Sitter cosmological horizon. In the latter case the use of static coordinates is essential to understand the physical picture. In order to see whether a BEC is preferred, we use the Brown–York quasilocal energy, finding that a condensate is energetically favorable in all cases in the classically forbidden region. The Brown–York quasilocal energy also allows us to derive a quasilocal potential, whose consequences we explore. Assuming the validity of this quasilocal potential allows us to suggest a possible mechanism to generate a graviton condensate in black holes. However, this mechanism appears not to be feasible in order to generate a quantum condensate behind the cosmological de Sitter horizon.

scholarly journals Quantum analogue of a Kerr black hole and the Penrose effect in a Bose-Einstein condensate

2019 ◽  
Vol 99 (21) ◽  
Author(s):  
D. D. Solnyshkov ◽  
C. Leblanc ◽  
S. V. Koniakhin ◽  
O. Bleu ◽  
G. Malpuech
Keyword(s):  
Black Hole ◽  
Kerr Black Hole ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Quantum Analogue ◽  
Penrose Effect ◽  
Bose Einstein

scholarly journals Back-Reaction in Canonical Analogue Black Holes

2020 ◽  
Vol 10 (24) ◽  
pp. 8868
Author(s):  
Stefano Liberati ◽  
Giovanni Tricella ◽  
Andrea Trombettoni
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Density Distribution ◽  
Hawking Radiation ◽  
Einstein Condensate ◽  
Back Reaction ◽  
Unitary Evolution ◽  
Black Hole Evaporation ◽  
Bose Einstein Condensate ◽  
Bose Einstein

We study the back-reaction associated with Hawking evaporation of an acoustic canonical analogue black hole in a Bose–Einstein condensate. We show that the emission of Hawking radiation induces a local back-reaction on the condensate, perturbing it in the near-horizon region, and a global back-reaction in the density distribution of the atoms. We discuss how these results produce useful insights into the process of black hole evaporation and its compatibility with a unitary evolution.

scholarly journals Cold Dark Matter: A Gluonic Bose–Einstein Condensate in Anti-de Sitter Space Time

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 402
Author(s):  
Gilles Cohen-Tannoudji ◽  
Jean-Pierre Gazeau
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Standard Model ◽  
Cold Dark Matter ◽  
Hidden Variables ◽  
Einstein Condensate ◽  
De Sitter ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
The Universe

In the same way as the realization of some of the famous gedanken experiments imagined by the founding fathers of quantum mechanics has recently led to the current renewal of the interpretation of quantum physics, it seems that the most recent progress of observational astrophysics can be interpreted as the realization of some cosmological gedanken experiments such as the removal from the universe of the whole visible matter or the cosmic time travel leading to a new cosmological standard model. This standard model involves two dark components of the universe, dark energy and dark matter. Whereas dark energy is usually associated with the cosmological constant, we propose explaining dark matter as a pure QCD effect, namely a gluonic Bose–Einstein condensate, following the transition from the quark gluon plasma phase to the colorless hadronic phase. Our approach not only allows us to assume a Dark/Visible ratio equal to 11/2 but also provides gluons (and di-gluons, viewed as quasi-particles) with an extra mass of vibrational nature. Such an interpretation would support the idea that, apart from the violation of the matter/antimatter symmetry satisfying the Sakharov’s conditions, the reconciliation of particle physics and cosmology needs not the recourse to any ad hoc fields, particles or hidden variables.

scholarly journals Scalar field as a Bose–Einstein condensate in a Schwarzschild–de Sitter spacetime

2017 ◽  
Vol 26 (04) ◽  
pp. 1750032 ◽  
Author(s):  
Elías Castellanos ◽  
Celia Escamilla-Rivera ◽  
Claus Lämmerzahl ◽  
Alfredo Macías
Keyword(s):  
Scalar Field ◽  
Field Configuration ◽  
Einstein Condensate ◽  
De Sitter ◽  
Bose Einstein Condensate ◽  
Sitter Spacetime ◽  
Sitter Background ◽  
The Stability ◽  
Bose Einstein ◽  
Natural Way

In this paper, we analyze some properties of a scalar field configuration, where it is considered as a trapped Bose–Einstein condensate in a Schwarzschild–de Sitter background spacetime. In a natural way, the geometry of the curved spacetime provides an effective trapping potential for the scalar field configuration. This allows us to explore some thermodynamical properties of the system. Additionally, the curved geometry of the spacetime also induces a position-dependent self-interaction parameter, which can be interpreted as a kind of gravitational Feshbach resonance, that could affect the stability of the cloud and could be used to obtain information about the interactions among the components of the system.

scholarly journals Correlations between a Hawking particle and its partner in a 1+1D Bose-Einstein condensate analog black hole

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Richard A. Dudley ◽  
Alessandro Fabbri ◽  
Paul R. Anderson ◽  
Roberto Balbinot
Keyword(s):  
Black Hole ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Birth of a quasi-stationary black hole in an outcoupled Bose–Einstein condensate

2014 ◽  
Vol 16 (12) ◽  
pp. 123033 ◽  
Author(s):  
J R M de Nova ◽  
D Guéry-Odelin ◽  
F Sols ◽  
I Zapata
Keyword(s):  
Black Hole ◽  
Einstein Condensate ◽  
Stationary Black Hole ◽  
Bose Einstein Condensate ◽  
Bose Einstein

scholarly journals Is a Bose–Einstein condensate a good candidate for dark matter? A test with galaxy rotation curves

2020 ◽  
Vol 29 (09) ◽  
pp. 2050063 ◽  
Author(s):  
Elías Castellanos ◽  
Celia Escamilla-Rivera ◽  
Jorge Mastache
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Einstein Condensate ◽  
Average Particle ◽  
Rotation Curves ◽  
Massive Scalar Field ◽  
Thomas Fermi ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
Galaxy Rotation Curves

We analyze the rotation curves that correspond to a Bose–Einstein Condensate (BEC)-type halo surrounding a Schwarzschild-type black hole to confront predictions of the model upon observations of galaxy rotation curves. We model the halo as a BEC in terms of a massive scalar field that satisfies a Klein–Gordon equation with a self-interaction term. We also assume that the bosonic cloud is not self-gravitating. To model the halo, we apply a simple form of the Thomas–Fermi approximation that allows us to extract relevant results with a simple and concise procedure. Using galaxy data from a subsample of SPARC data base, we find the best fits of the BEC model by using the Thomas–Fermi approximation and perform a Bayesian statistics analysis to compare the obtained BEC’s scenarios with the Navarro–Frenk–White (NFW) model as pivot model. We find that in the centre of galaxies, we must have a supermassive compact central object, i.e. supermassive black hole, in the range of [Formula: see text] which condensate a boson cloud with average particle mass [Formula: see text] eV and a self-interaction coupling constant [Formula: see text], i.e. the system behaves as a weakly interacting BEC. We compare the BEC model with NFW concluding that in general the BEC model using the Thomas–Fermi approximation is strong enough compared with the NFW fittings. Moreover, we show that BECs still well-fit the galaxy rotation curves and, more importantly, could lead to an understanding of the dark matter nature from first principles.

scholarly journals Black-Hole evaporation and quantum-depletion in Bose–Einstein condensates

2020 ◽  
pp. 2150006
Author(s):  
Ivan Arraut
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Temperature Regime ◽  
Hawking Radiation ◽  
Einstein Condensate ◽  
Zero Temperature ◽  
Black Hole Evaporation ◽  
Bose Einstein Condensate ◽  
Bose Einstein ◽  
Bogoliubov Transformations

We study the analogy between the Hawking radiation in Black-Holes and the quantum depletion process of a Bose–Einstein condensate by using the Bogoliubov transformations method. We find that the relation between the Bogoliubov coefficients is similar in both cases (in the appropriate regimes). We then connect the condensate variables with those associated to the Black-Hole, demonstrating then that the zero temperature regime of the condensate is equivalent to the existence of an event horizon in gravity.

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