1,069 research outputs found
Nuclear reaction path and requantization of TDDFT
Using a theory of large amplitude collective motion, the adiabatic
self-consistent collective coordinate method, we derive reaction path for the
fusion process at sub-barrier energies. The collective Hamiltonian to describe
the fusion process is constructed, based on the obtained reaction path and
canonical variables. We study the reaction of N=Z stable nuclei, alpha+16O,
16O+16O, and alpha+12C. The results suggest that, after two nuclei touch, the
reaction path is significantly deviated from the simple relative motion, which
may affect the deep sub-barrier fusion cross section.Comment: 8 pages, 2 figures, Proceedings of IIRC symposium "Perspectives of
the Physics of Nuclear Structure
Statistically-Anisotropic Tensor Bispectrum from Inflation
We develop a possibility of generating tensor non-Gaussianity in a kind of
anisotropic inflation, where a gauge field is kinetically coupled to a
spectator scalar field. Owing to this coupling, the coherent mode of the
electric field appears and softly breaks the isotropy of the Universe. We
compute the bispectrum of linearly-polarized tensor perturbations sourced by
the gauge field and find that it is strongly red-tilted and has distinctive
statistical anisotropies including higher-order multipole moments.
Interestingly, the tensor bispectra with the specific combinations of linear
polarization modes are dominant, and their amplitudes depend on the different
sets of multipole moments. This new type of statistically-anisotropic tensor
non-Gaussianity can be potentially testable with the upcoming cosmic microwave
background B-mode polarization experiments.Comment: 25 pages, 4 figure
Idiopathic Retroperitoneal Hematoma
A 34-year-old female presented with sudden onset of severe abdominal pain in a flank distribution. A large mass was palpable in the right upper quadrant on physical examination. Abdominal contrast-enhanced computed tomography showed a well-defined, right-sided, retroperitoneal cystic lesion located between the abdominal aorta and the inferior vena cava (IVC). The tumor size was 55 Γ 58 mm, and it compressed the gallbladder and the duodenum. Upper gastrointestinal radiography revealed a stricture of the second portion of the duodenum by the tumor. T2-weighted magnetic resonance imaging showed that the whole part was hyperintense with hypointense rims, but the inner was partially hypointense. Based on the radiological findings, the preoperative differential diagnosis included retroperitoneal teratoma, Schwannoma, abscess, and primary retroperitoneal tumor. On laparotomy, the tumor was located in the right retroperitoneal cavity. Kocher maneuver and medial visceral rotation, which consists of medial reflection of the upper part of right colon and duodenum by incising their lateral peritoneal attachments, were performed. Although a slight adhesion to the IVC was detected, the tumor was removed safely. Thin-section histopathology examination detected neither tumor tissues nor any tissues such as adrenal gland, ovarian tissue, or endometrial implants. The final pathological diagnosis was idiopathic retroperitoneal hematoma; the origin of the bleeding was unclear. The patient was discharged without any complication 5 days after the operation
On the Impossibility of Post-Quantum Black-Box Zero-Knowledge in Constant Rounds
We investigate the existence of constant-round post-quantum black-box
zero-knowledge protocols for . As a main result, we show that
there is no constant-round post-quantum black-box zero-knowledge argument for
unless . As constant-round
black-box zero-knowledge arguments for exist in the classical
setting, our main result points out a fundamental difference between
post-quantum and classical zero-knowledge protocols. Combining previous
results, we conclude that unless ,
constant-round post-quantum zero-knowledge protocols for exist if
and only if we use non-black-box techniques or relax certain security
requirements such as relaxing standard zero-knowledge to
-zero-knowledge. Additionally, we also prove that three-round and
public-coin constant-round post-quantum black-box -zero-knowledge
arguments for do not exist unless .Comment: 46 page
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