Cooper quartet correlations in infinite symmetric nuclear matter

Guo, Yixin; Tajima, Hiroyuki; Liang, Haozhao

doi:10.1103/physrevc.105.024317

Cited by 14 publications

(5 citation statements)

References 63 publications

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“…This value is also close to the density where E F reaches the alpha binding energy per nucleon ∼ 7 MeV [13]. Even above this density, there is a possibility that alpha-particle-like states may remain as Cooper quartets [32][33][34].…”

Section: In-medium 5 He Statesupporting

confidence: 63%

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

Tajima¹,

Moriya²,

Horiuchi³

et al. 2022

Preprint

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We theoretically investigate the fate of a neutron-alpha p-wave resonance in dilute neutron matter, which may be encountered in neutron stars and supernova explosions. While 5 He is known as a resonant state that decays to a neutron and an alpha particle in vacuum, this unstable state turns into a stable bound state in the neutron Fermi sea because the decay process is forbidden by the Pauli-blocking effect of neutrons. Such a resonance-to-bound transition assisted by the Pauli-blocking effect can be realized in cold atomic experiments for a quantum mixture near the heteronuclear Feshbach resonance.

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Section: In-medium 5 He Statesupporting

confidence: 63%

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

Tajima¹,

Moriya²,

Horiuchi³

et al. 2022

Preprint

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“…In fact, the momentum distribution of fermions forming Cooper pairs has been directly observed in a recent state-of-the-art experiment [8]. Moreover, multi-component Fermi gases can be realized by using different hyperfine states of ultracold atoms (e.g., 6 Li [10], 173 Yb [11]). The long-range order in a multi-component attractive Hubbard model has also been discussed theoretically [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the concept of Cooper pairs has been generalized to cluster states consisting of three or more particles, such as Cooper triples [2,3] and Cooper quartets [4][5][6]. While these kinds of states have been widely discussed in nuclear and condensed matter systems, ultracold atomic gases may provide a promising platform to investigate the existence of nontrivial Cooper multiplets.…”

Section: Introductionmentioning

confidence: 99%

Condensation of Cooper triples

2021

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We theoretically discuss the possible condensation of Cooper triples, which correspond to a threebody version of Cooper pairs, in three-component Fermi systems with three-body attractive interactions. A macroscopic number of Cooper triples can occupy a zero center-of-mass momentum state in the presence of a Fermi surface of constituent particles, even though the three-body operator exhibits anti-commutation relation associated with the Fermi-Dirac statistics. Such a condensation with internal degrees of freedom is similar to bosonization in a system of infinite-component fermions. We propose a variational wave function for condensed Cooper triples and show that in the ground state, the condensed state is energetically favored compared to the normal state. Also, we discuss effects of the Fermi-surface distortion in a lattice system described by a three-component Hubbard model.

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“…Building off of some of the works with the Kerr solution, some others have repeated the studies with other non-Kerr black hole solutions (e.g. [16][17][18]). A recent study using a more realistic disk model and non-Kerr solutions studied the black hole shadow as a whole, but found that the photon ring, i.e.…”

Section: Introductionmentioning

confidence: 99%

Testing gravity with black hole shadow subrings

Ayzenberg¹

2022

Class. Quantum Grav.

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The black hole shadow, first observed by the Event Horizon Telescope in 2017, is the newest method for studying black holes and understanding gravity. Much work has gone into understanding the shadow of a Kerr black hole, including all of the complex astrophysics of the accretion disk, and there are numerous studies of the ideal shadow in non-Kerr black holes and exotic compact objects. This paper presents one of the first studies of the black hole shadow of non-Kerr black holes when the illumination source is an accretion disk. In particular, the ability of current and future very long baseline interformeters to estimate the physical parameters of the black hole spacetime and accretion disk is investigated using two different parametrized black hole metrics that encode a number of possible deviations from Kerr. Both the full shadow image and the individual subrings of the shadow are analyzed as the higher order subrings are weakly dependent on the disk physics and may be a more viable observable for studying the spacetime. The results suggest that with current telescope capabilities and any future earth-based telescopes it will be quite difficult to place strong constraints on departures from the Kerr spacetime, primarily due to the low resolution and strong degeneracies between the spacetime parameters. More optimistically, space-based interferometers may be capable of testing the Kerr nature of black holes and general relativity to comparable or better precision than is currently possible with other observations.

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Cooper quartet correlations in infinite symmetric nuclear matter

Cited by 14 publications

References 63 publications

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

Resonance-to-bound transition of $^5$He in neutron matter and its analogy with heteronuclear Feshbach molecule

Condensation of Cooper triples

Testing gravity with black hole shadow subrings

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