Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
8,590
result(s) for
"Yin, Wen"
Sort by:
ثقافة الأطعمة الصينية
يتناول كتاب (ثقافة الأطعمة الصينية) والذي قام بتأليفه (زهاو رونغقوانغ) في حوالي (103) صفحة من القطع المتوسط موضوع (عادات الطعام في الصين) مستعرضا المحتويات التالية : الباب الأول : ثقافة مواد الأطعمة الصينية، الباب الثاني : الخاصية الإقليمية لثقافة الأطعمة الصينية، الباب الثالث : التقاليد والطقوس الشعبية للأطمعة الصينية، الباب الرابع : فنون الطبخ الصيني وثقافة التوابل.
Book
Cosmic clues: DESI, dark energy, and the cosmological constant problem
A
bstract
Several attempts to solve the cosmological constant problem, which concerns the value of the cosmological constant being extremely smaller than the Standard Model mass scales, have introduced a scalar field with a very flat potential that can be approximated as linear around any given position. The scalar field scans the cosmological constant in such a way that the current small value is explained. Recently, Dark Energy Spectroscopic Instrument (DESI) reported the results of the first year. Combining the data with CMB, Pantheon, Union3, and/or DES-SN5YR, there is a preference or anomaly, indicating that the dark energy in the current Universe slightly deviates from that in the ΛCDM model and varies over time. In this paper, I show that the simple linear potential of a scalar field that may explain the small cosmological constant, can explain the DESI anomaly. The conclusions do not change by including or not including a thermal friction effect. In particular, the model proposed by the present author in [1], which relaxes the cosmological constant by the condition that inflation ends, predicts a time-dependence of the dark energy close to the one favored by the data.
Journal Article
Muon g − 2 anomaly in anomaly mediation
A
bstract
The long-standing muon
g −
2 anomaly has been confirmed recently at the Fermilab. The combined discrepancy from Fermilab and Brookhaven results shows a difference from the theory at a significance of 4.2
σ
. In addition, the LHC has updated the lower mass bound of a pure wino. In this letter, we study to what extent the
g −
2 can be explained in anomaly mediation scenarios, where the pure wino is the dominant dark matter component. To this end, we derive some model-independent constraints on the particle spectra and
g −
2. We find that the
g −
2 explanation at the 1
σ
level is driven into a corner if the higgsino threshold correction is suppressed. On the contrary, if the threshold correction is sizable, the
g −
2 can be explained. In the whole viable parameter region, the gluino mass is at most 2
−
4 TeV, the bino mass is at most 2 TeV, and the wino dark matter mass is at most 1
−
2 TeV. If the muon
g −
2 anomaly is explained in the anomaly mediation scenarios, colliders and indirect search for the dark matter may find further pieces of evidence in the near future. Possible UV models for the large threshold corrections are discussed.
Journal Article
ثقافة الطعام الصيني
الصين دولة ذات حضارة عريقة وتاريخ طويل، ظلت خلال هذا التاريخ الطويل محتفظة بالكثير من عاداتها وتقاليدها ولغتها حتى ملابس أهلها. يعيش على أرضها ستة وخمسين قومية تتمتع كل قومية منها بعادات وتقاليد وثقافة خاصة. هذا الكتاب رحلة ثقافية شيقة إذ يسلط الضوء على جانب من أهم جوانب الثقافة الصينية ألا وهو \"ثقافة الطعام الصيني. فيلقى الضوء على تاريخ الأطعمة الصينية وثقافتها وتقسيمات المطبخ الصيني وعادات وثقافة الأطعمة الخاصة بالأعياد والمناسبات التقليدية، وثقافة الأطعمة الخاصة بالديانات المختلفة في الصين بما فيها البوذية والطاوية والإسلام والمسيحية وعادات الطعام عند القوميات الصينية، ويهتم بتقديم بعض الجوانب المهمة بثقافة الشاي الصيني وأنواعه وطرق وآداب تناوله هذا الكتاب وجبة دسمة من المعلومات الخاصة بثقافة الأطعمة الصينية التي شهدت خلال السنوات الأخيرة انتشارا واسعا على مستوى العالم بما في ذلك المنطقة العربية.
Book
Scale and quality of Peccei-Quinn symmetry and weak gravity conjectures
A
bstract
The promising solution to the strong CP problem by a Peccei-Quinn (PQ) symmetry may introduce quality and hierarchy problems, which are both relevant to Planck physics. In this paper, we study whether both problems can be explained by introducing a simple hidden gauge group which satisfies the WGC or its variant. As a concrete example, we point out that a weakly-coupled hidden SU(
N
) gauge symmetry, which is broken down to SO(
N
), can do this job in the context of a Tower/sub-Lattice WGC. Cosmology is discussed.
Journal Article
Thermal production of cold “hot dark matter” around eV
A
bstract
A very simple production mechanism of feebly interacting dark matter (DM) that rarely annihilates is thermal production, which predicts the DM mass around eV. This has been widely known as the hot DM scenario. Despite there are several observational hints from background lights suggesting a DM in this mass range, the hot DM scenario has been considered strongly in tension with the structure formation of our Universe because the free-streaming length of the DM produced from thermal reactions was thought to be too long. In this paper, I show that the previous conclusions are not always true depending on the reaction for bosonic DM because of the Bose-enhanced reaction at very low momentum. By utilizing a simple 1 ↔ 2 decay/inverse decay process to produce DM, I demonstrate that eV range bosonic DM can be thermally produced in a cold manner from a hot plasma through a model-independent analysis applicable to axion, hidden photon, and other bosonic DM candidates. As a result, bosonic DM in the eV mass range may still be unique and theoretically well-motivated. I also discuss some caveats arising from this phenomenon in the freeze-in production of DM, and present a related system that can suppress the hot plasma with thermal reaction.
Journal Article
Feebly-interacting Peccei-Quinn model
A
bstract
The QCD axion is widely studied as a dark matter (DM) candidate and as a solution to the strong CP problem of the Standard Model. In conventional field-theoretic models, a much larger mass scale than the electroweak (EW) scale is typically introduced to spontaneously break Peccei-Quinn (PQ) symmetry with a large enough axion decay constant,
f
a
, thereby avoiding constraints from star cooling. In this paper, I propose an alternative approach to achieving the large decay constant: a PQ scalar field with a large wave function renormalization constant, analogous to a feebly coupled gauge theory. Other dimensionless parameters are
O
1
in the unit of the EW scale for the naturalness. This framework predicts a light PQ Higgs boson with a mass ~ (EW scale)
2
/
f
a
. Exotic particles associated with the PQ anomaly are expected to have masses around the EW scale. The proposed model alleviates both the PQ quality and EW scale fine-tuning problems and introduces interesting axion-PQ Higgs cosmologies, encompassing: slim axion DM from a fat string network, heavy axion DM from PQ Higgs condensate fragmentation, PQ Higgs DM, and axion-PQ Higgs co-DM scenarios. Potential experimental signatures are explored, including fifth-force tests, DM detections, accelerator searches, and gravitational wave observations by employing lattice simulation. Possible extensions of the scenario are also discussed.
Journal Article
Radiative lepton mass and muon g − 2 with suppressed lepton flavor and CP violations
A
bstract
The recent experimental status, including the confirmation of the muon
g −
2 anomaly at Fermilab, indicates a Beyond Standard Model (BSM) satisfying the following properties: 1) it enhances the
g −
2 2) suppresses flavor violations, such as
μ → eγ
, 3) suppresses CP violations, such as the electron electric dipole moment (EDM). In this letter, I show that the eigenbasis of the mass matrix and higher dimensional photon operators can be automatically aligned if the masses of heavy leptons are generated radiatively together with the
g −
2. As a result, the muon
g −
2 is enhanced but the EDM of the electron and
μ → eγ
rate are naturally suppressed. Phenomenology and applications of the mechanism to the B-physics anomalies are argued.
Journal Article
Explaining electron and muon g − 2 anomaly in SUSY without lepton-flavor mixings
A
bstract
We propose a SUSY scenario to explain the current electron and muon
g
− 2 discrepancies without introducing lepton flavor mixings. Threshold corrections to the Yukawa couplings can enhance the electron
g
− 2 and flip the sign of the SUSY contributions. The mechanism predicts a flavor-dependent slepton mass spectrum. We show that it is compatible with the Higgs mediation scenario.
Journal Article