Constraints on the combined models with R 2 − q $R^{2-q}$ inflation and viable f ( R ) $f(R)$ dark energy
نویسندگان
چکیده
منابع مشابه
Towards large r from [ p , q ] - inflation
The recent discovery of B-mode polarizations in the CMB by the BICEP2 collaboration motivates the study of large-field inflation models which can naturally lead to significant tensor-to-scalar ratios. A class of such models in string theory are axion monodromy models, where the shift symmetry of an axion is broken by some branes. In type IIB string theory such models so far utilized NS5 branes ...
متن کاملNew Large (n, r)-arcs in PG(2, q)
An $(n, r)$-arc is a set of $n$ points of a projective plane such that some $r$, but no $r+1$ of them, are collinear. The maximum size of an $(n, r)$-arc in $PG(2, q)$ is denoted by $m_r(2,q)$. In this paper we present a new $(184,12)$-arc in PG$(2,17),$ a new $(244,14)$-arc and a new $(267,15$)-arc in $PG(2,19).$
متن کاملتوسعه مدل‌های کنترل موجودی (r,Q) و(R,T)
در این مقاله مدل‌های سنتی کنترل موجودی (r,Q) و(R,T) به صورت یک مدل چند‌کالایی با دو هدف کمینه‌سازی هزینه‌ها و سطح خطر و تحت محدودیت‌های بودجه در‌دسترس، حداقل سطح عملکرد، فضای انبار و تعداد کمبود مجاز توسعه یافته‌اند. تابع توزیع تقاضا نرمال بوده و تقاضا با پس‌افت تأمین می‌گردد. ابتدا مدل قطعی و سپس مدل احتمالی- فازی با پارامترهای بودجه فازی، تعداد کمبود مجاز فازی، و فضای انبار که پارامتری احتمال...
متن کاملStructure formation and generalized second law of thermodynamics in some viable f(R)-gravity models
We investigate the growth of matter density perturbations as well as the generalized second law (GSL) of thermodynamics in the framework of f(R)-gravity. We consider a spatially flat FRW universe filled with the pressureless matter and radiation which is enclosed by the dynamical apparent horizon with the Hawking temperature. For some viable f(R) models containing the Starobinsky, Hu-Sawicki, Exp...
متن کاملOn q-Boson Operators and q-Analogues of the r-Whitney and r-Dowling Numbers
We define the (q, r)-Whitney numbers of the first and second kinds in terms of the q-Boson operators, and obtain several fundamental properties such as recurrence formulas, orthogonality and inverse relations, and other interesting identities. As a special case, we obtain a q-analogue of the r-Stirling numbers of the first and second kinds. Finally, we define the (q, r)-Dowling polynomials in t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 2015
ISSN: 0004-640X,1572-946X
DOI: 10.1007/s10509-015-2535-9