scholarly journals All the Fundamental Massless Fermion Fields in Superstring Theory: A Rigorous Analysis

2012 ◽  
Vol 03 (09) ◽  
pp. 1027-1030 ◽  
Author(s):  
Edward B. Manoukian
Keyword(s):  
Superstring Theory ◽  
Rigorous Analysis ◽  
Massless Fermion ◽  
Fermion Fields

FERMION PERTURBATIONS IN HIGHER-DIMENSIONAL STRING-THEORY BLACK HOLES

2013 ◽  
Vol 22 (10) ◽  
pp. 1350073
Author(s):  
OWEN PAVEL FERNÁNDEZ PIEDRA ◽  
JOSE BERNAL CASTILLO ◽  
YULIER JIMENEZ SANTANA ◽  
LEOSDAN FIGUEREDO NORIS
Keyword(s):  
Black Hole ◽  
Damping Factor ◽  
Test Field ◽  
Perfect Agreement ◽  
Massless Fermion ◽  
Time Domain Data ◽  
Fermion Fields ◽  
Dimensional Spacetime ◽  
Higher Dimensional ◽  
The Time Domain

In this paper, we report the results of a detailed investigation of the complete time evolution of massless fermion fields propagating in spacetimes of higher-dimensional stringy black hole solutions, obtained from intersecting branes in string/M theory. We write the Dirac equation in D-dimensional spacetime in a form suitable to perform a numerical integration of it, and using a Prony fitting of the time domain data, we determine the quasinormal frequencies that characterize the test field evolution at intermediary times. We also present the results obtained for the quasinormal frequencies using a sixth-order WKB approximation, that are in perfect agreement with the numerical results. The power-law exponents that describe the field relaxation at very late-times are also determined, and we show that they depends upon the dimensionality of spacetime, and are identical to that associated with the relaxation of boson fields for odd dimensions. The dependence of the frequencies and damping factor of the spinor field with the charges of the stringy black hole are studied.

Number of massless fermion families in superstring theory

1985 ◽  
Vol 163 (1-4) ◽  
pp. 118-122 ◽  
Author(s):  
Itzhak Bars ◽  
Matt Visser
Keyword(s):  
Superstring Theory ◽  
Massless Fermion

scholarly journals OBJECT PICTURE, QUASINORMAL MODES AND LATE TIME TAILS OF FERMION PERTURBATIONS IN STRINGY BLACK HOLES WITH U(1) CHARGES

2012 ◽  
Vol 21 (05) ◽  
pp. 1250044 ◽  
Author(s):  
OWEN PAVEL FERNÁNDEZ PIEDRA ◽  
FIDEL SOSA NUÑEZ ◽  
JOSE BERNAL CASTILLO ◽  
YULIER JIMENEZ SANTANA
Keyword(s):  
Black Holes ◽  
Present Report ◽  
Quasinormal Modes ◽  
Late Time ◽  
Massless Fermion ◽  
Time Profiles ◽  
Power Law Decay ◽  
Fermion Fields ◽  
Higher Dimensional ◽  
Boson Fields

The aim of the present report is the study of massless fermion perturbations outside five-dimensional stringy black holes with U(1) charges. The Dirac equation was numerically solved to obtain the time profiles for evolving fermion fields, and the quasinormal frequencies at intermediate times are computed by numerical Prony fitting and semi-analytical Wentzel–Kramers–Brillouin (WKB) expansion at sixth-order. We also computed numerically the latetime power law decay factors, showing that there are in correspondence with previously reported results for the case of boson fields in higher-dimensional odd spacetimes. The dependence of quasinormal frequencies with U(1) compactification charges are studied.

scholarly journals CONSTRAINTS ON THE COSMOLOGICAL CONSTANT DUE TO SCALE INVARIANCE

2010 ◽  
Vol 25 (16) ◽  
pp. 1349-1364 ◽  
Author(s):  
PAVAN K. ALURI ◽  
PANKAJ JAIN ◽  
SUBHADIP MITRA ◽  
SUKANTA PANDA ◽  
NAVEEN K. SINGH
Keyword(s):  
Cosmological Constant ◽  
Scale Invariance ◽  
Vacuum Energy ◽  
Higgs Field ◽  
Gauge Fields ◽  
Simple Relationship ◽  
Massless Fermion ◽  
Fermion Fields ◽  
Effective Cosmological Constant ◽  
The Standard Model

We consider the standard model with local scale invariance. The theory shows exact scale invariance of dimensionally regulated action. We show that massless gauge fields, which may be Abelian or non-Abelian, lead to vanishing contribution to the cosmological constant in this theory. This result follows in the quantum theory, to all orders in the gauge couplings. However, we have not considered contributions higher orders in the gravitational coupling. Similarly we also find that massless fermion fields yield null contribution to the cosmological constant. The effective cosmological constant in this theory is nonzero due to the phenomenon of cosmological symmetry breaking, which also gives masses to all the massive fields, besides generating the Planck mass. We find a simple relationship between the curvature scalar and the vacuum value of the Higgs field in the limit when we ignore all other contributions to the energy density besides the vacuum energy.

scholarly journals NONEXISTENCE THEOREMS FOR TRAVERSABLE WORMHOLES

1999 ◽  
Vol 14 (13) ◽  
pp. 843-848 ◽  
Author(s):  
ALBERTO SAA
Keyword(s):  
Scalar Fields ◽  
Massless Fermion ◽  
Real Scalar ◽  
Traversable Wormholes ◽  
Fermion Fields ◽  
Simple Theorem

Gauss–Bonnet formula is used to derive a new and simple theorem of nonexistence of vacuum static nonsingular Lorentzian wormholes. We also derive simple proofs for the nonexistence of Lorentzian wormhole solutions for some classes of static matter such as, for instance, real scalar fields with a generic potential obeying ϕV′(ϕ)≥0 and massless fermion fields.

Satire and Realism in Jane Austen’s Pride and Prejudice: an Interpretative Analysis

2019 ◽  
Vol 3 (1) ◽  
Keyword(s):  
Jane Austen ◽  
The Novel ◽  
Pride And Prejudice ◽  
Rigorous Analysis ◽  
Literary Life ◽  
Interpretative Analysis

Jane Austen is acknowledged for the application of realism and satire in her novels. This paper focuses on the analysis of realism and satire in Jane Austen’s Pride and Prejudice; however, her entire oeuvre spotlights the features (of satire and realism) alongside robust feminism: typical of her literary taste and temperament, not necessarily of the Romantic Age which she lived in. Rigorous analysis and realistic observation reveals that the employment of realism and satire in Pride and Prejudice, are quite obvious, in all sorts of aspects including narrative, settings, themes and characters. Analysis of the novel under study leads to the observation that satire and realism go hand in hand in the said novel—intermittently—and thoughtfully. Conclusively, it is observed that Jane Austen’s literary life had a tremendous influence on how to subsume realism (primarily through matrimonies) of age and satire on a romantic society (whereby ideals collapse headlong), in Pride and Prejudice.

General Takaful claims: An experience of Takaful operator in Malaysia

2017 ◽  
Vol 5 (4) ◽  
pp. 18
Author(s):  
Amirul Afif Muhamat ◽  
Mohamad Nizam Jaafar ◽  
Sharifah Faigah Syed Alwi
Keyword(s):  
Life Insurance ◽  
Islamic Finance ◽  
Rigorous Analysis ◽  
Finance Industry ◽  
General Insurance ◽  
Bright Side ◽  
Main Components ◽  
Islamic Insurance ◽  
Gathering Data ◽  
Observation Period

Takaful is interchangeably referred as Islamic insurance. In Malaysia, the takaful sector is part of the main components for Islamic finance industry. The business can be divided into two: general and family takaful. To ease understanding on this niche sector; general takaful is comparable to general insurance while family takaful is akin to life insurance with special reference needs to be given on the requirement of the business to adhere to the Islamic precepts. The main business in general takaful is motor takaful and this line of business is faced with high takaful claims. This study appraised the factors which affect the general takaful claims based on the experience of one takaful operator in Malaysia (the name of takaful operator is not disclosed due to confidentiality). The factors are: number of claims; fraud; and coverage for protection. The limitation of this study is that the observation period is only 10 years which limits rigorous analysis to be done. Nevertheless, previous studies in this area depict the same limitation – constraint in gathering data that has long observation period. On the bright side, the data in this study is still capable to produce meaningful results to be referred with regards to this issue – general takaful claims.

El Prestige: comparativa de los regímenes internacionales de responsabilidad civil

2019 ◽  
Vol 37 (3) ◽  
pp. 31
Author(s):  
Raquel Fernández González ◽  
Marcos Íñigo Pérez Pérez
Keyword(s):  
Institutional Economics ◽  
Geographical Area ◽  
New Institutional Economics ◽  
Rigorous Analysis ◽  
Judicial Process ◽  
Main Research ◽  
Civil Responsibility ◽  
The One ◽  
High Degree ◽  
The Prestige

The return of institutions to the main research agenda has highlighted the importance of rules in economic analysis. The New Institutional Economics has allowed a better understanding of the case studies that concern different areas of knowledge, also the one concerning the management of natural resources. In this article, the institutional analysis focuses on the maritime domain, where two large civil liability regimes for pollution coexist (OPA 90-IMO), each in a different geographical area (United States - Europe). Therefore, a comparative analysis is made between the two large regimes of civil responsibility assignment applying them to the Prestige catastrophe. In this way, the allocation and distribution of responsibilities in the investigation and subsequent judicial process of the Prestige is compared with an alternative scenario in which the applicable compensation instruments are governed by the provisions of the Oil Polution Act of 1990 (OPA 90), in order to establish a rigorous analysis on the effects that the different norms can have in the same scenario. In the comparative established in the case of the Prestige, where the responsibilities were solved very slowly in a judicial process with high transaction costs, the application of rules governed by the OPA 90 would not count with such a high degree of imperfection. This is so, since by applying the preponderance of the evidence existing in OPA 90 there would be no mitigation for the presumed culprits. On the other hand, the agents involved in the sinking would not be limited only to the owner, but also that operators or shipowners would be responsible as well. In addition, the amount of compensation would increase when counting in the damage count the personal damages, the taxes without perceiving and the ecological damage caused in a broad sense, damages not computable in the IMO.

scholarly journals Role of miRNAs in Normal Endometrium and in Endometrial Disorders: Comprehensive Review

2021 ◽  
Vol 10 (16) ◽  
pp. 3457
Author(s):  
Kamila Kolanska ◽  
Sofiane Bendifallah ◽  
Geoffroy Canlorbe ◽  
Arsène Mekinian ◽  
Cyril Touboul ◽  
...  
Keyword(s):  
Endometrial Cancer ◽  
Mirna Expression ◽  
Expression Patterns ◽  
Mirna Regulation ◽  
Rigorous Analysis ◽  
Sexual Hormones ◽  
Physiological Mechanisms ◽  
Normal Endometrium ◽  
Gynecological Disorders

The molecular responses to hormonal stimuli in the endometrium are modulated at the transcriptional and post-transcriptional stages. Any imbalance in cellular and molecular endometrial homeostasis may lead to gynecological disorders. MicroRNAs (miRNAs) are involved in a wide variety of physiological mechanisms and their expression patterns in the endometrium are currently attracting a lot of interest. miRNA regulation could be hormone dependent. Conversely, miRNAs could regulate the action of sexual hormones. Modifications to miRNA expression in pathological situations could either be a cause or a result of the existing pathology. The complexity of miRNA actions and the diversity of signaling pathways controlled by numerous miRNAs require rigorous analysis and findings need to be interpreted with caution. Alteration of miRNA expression in women with endometriosis has been reported. Thus, a potential diagnostic test supported by a specific miRNA signature could contribute to early diagnosis and a change in the therapeutic paradigm. Similarly, specific miRNA profile signatures are expected for RIF and endometrial cancer, with direct implications for associated therapies for RIF and adjuvant therapies for endometrial cancer. Advances in targeted therapies based on the regulation of miRNA expression are under evaluation.

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