scholarly journals TwInflation

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Kaustubh Deshpande ◽  
Soubhik Kumar ◽  
Raman Sundrum
Keyword(s):  
General Structure ◽  
Ultra Violet ◽  
Effective Field ◽  
Fine Tuning ◽  
Hierarchy Problem ◽  
Future Directions ◽  
Cosmic Inflation ◽  
Hybrid Mechanism ◽  
The Face ◽  
Hybrid Inflation

Abstract The general structure of Hybrid Inflation remains a very well-motivated mechanism for lower-scale cosmic inflation in the face of improving constraints on the tensor-to-scalar ratio. However, as originally modeled, the “waterfall” field in this mechanism gives rise to a hierarchy problem (η−problem) for the inflaton after demanding standard effective field theory (EFT) control. We modify the hybrid mechanism and incorporate a discrete “twin” symmetry, thereby yielding a viable, natural and EFT-controlled model of non-supersymmetric low-scale inflation, “Twinflation”. Analogously to Twin Higgs models, the discrete exchange-symmetry with a “twin” sector reduces quadratic sensitivity in the inflationary potential to ultra-violet physics, at the root of the hierarchy problem. The observed phase of inflation takes place on a hilltop-like potential but without fine-tuning of the initial inflaton position in field-space. We also show that all parameters of the model can take natural values, below any associated EFT-cutoff mass scales and field values, thus ensuring straightforward theoretical control. We discuss the basic phenomenological considerations and constraints, as well as possible future directions.

scholarly journals The ultra-violet spectrum of magnesium hydride. 1.—The band at λ 2430

1929 ◽  
Vol 122 (790) ◽  
pp. 442-455 ◽  
Keyword(s):  
Fine Structure ◽  
General Structure ◽  
Energy Levels ◽  
Visible Region ◽  
Ultra Violet ◽  
Present Theory ◽  
Magnesium Hydride ◽  
Electronic Energy ◽  
Band Spectra ◽  
Electronic Energy Levels

The system of bands in the visible region of the emission spectrum of magnesium hydride is now well known. The bands with heads at λλ 5622, 5211, 4845 were first measured by Prof. A. Fowler, who arranged many of the strongest lines in empirical series for identification with absorption lines in the spectra of sun-spots. Later, Heurlinger rearranged these series in the now familiar form of P, Q and R branches, and considered them, with the OH group, as typical of doublet systems in his classification of the fine structure of bands. More recently, W. W. Watson and P. Rudnick have remeasured these bands, using the second order of a 21-foot concave grating, and have carried out a further investigation of the fine structure in the light of the present theory of band spectra. Their detection of an isotope effect of the right order of magnitude, considered with the general structure of the system, and the experimental work on the production of the spectrum, seems conclusive in assigning these bands to the diatomic molecule MgH. The ultra-violet spectrum of magnesium hydride is not so well known. The band at λ 2430 and the series of double lines in the region λ 2940 to λ 3100, which were recorded by Prof. Fowler in 1909 as accompanying the group of bands in the visible region, appear to have undergone no further investigation. In view of the important part played by hydride band spectra in the correlation of molecular and atomic electronic energy levels, it was thought that a study of these features might prove of interest in yielding further information on the energy states of the MgH molecule. The present paper deals with observations on the band at λ 2430; details of an investigation of the other features of the ultra-violet spectrum will be given in a later communication.

scholarly journals The Future of Fat Grafting

2021 ◽  
Vol 41 (Supplement_1) ◽  
pp. S69-S74
Author(s):  
Summer E Hanson
Keyword(s):  
Adipose Tissue ◽  
Breast Reconstruction ◽  
Fat Grafting ◽  
The Other ◽  
Special Topic ◽  
Autologous Fat Grafting ◽  
Upper Arm ◽  
Future Directions ◽  
Autologous Fat ◽  
The Face

Abstract One of the earliest reported cases of autologous fat grafting (AFG) was by Neuber in 1893 and consisted of the transfer of small lobules of fat from the upper arm for cicatrical depression of the face. He advocated the use of smaller grafts, noting that pieces larger than the size of a bean would form cysts. In 1895, Czerny excised a lumbar lipoma and transplanted it to the chest for breast reconstruction. Since these early reports, the knowledge base around AFG has expanded exponentially, as illustrated by the other papers within this special topic. As we embark on the next phase of AFG in the clinical setting, there are several directions which are near-clinical translation. This paper discusses future directions in fat grafting that build on optimization of our current techniques as clinical indications expand, such as supplementing purified lipoaspirate and the associated regulatory burden, or deconstructing adipose tissue to selectively use adipose graft components for a variety of regenerative indications.

Executing production schedules in the face of uncertainties: A review and some future directions

2005 ◽  
Vol 161 (1) ◽  
pp. 86-110 ◽  
Author(s):  
Haldun Aytug ◽  
Mark A. Lawley ◽  
Kenneth McKay ◽  
Shantha Mohan ◽  
Reha Uzsoy
Keyword(s):  
Future Directions ◽  
The Face

Cloud Approach for the Medical Information System

2018 ◽  
pp. 238-261
Author(s):  
Ekaterine Kldiashvili
Keyword(s):  
Cloud Computing ◽  
Information System ◽  
Medical Information ◽  
Healthcare Services ◽  
Healthcare Research ◽  
Effective Field ◽  
Medical Information System ◽  
New Models ◽  
The Face ◽  
Intensive Development

Healthcare informatics is an important and effective field. It is characterized by the intensive development and design of the new models and protocols. The special emphasize is done on medical information system (MIS) and cloud approaches for its implementation. It is expected that this technology can improve healthcare services, benefit healthcare research, and change the face of health information technology. This chapter discusses the application of cloud computing for the medical information system practical usage.

scholarly journals Axion hilltops, Kahler modulus quintessence and the swampland criteria

2019 ◽  
Vol 34 (28) ◽  
pp. 1950164 ◽  
Author(s):  
Maxim Emelin ◽  
Radu Tatar
Keyword(s):  
Degrees Of Freedom ◽  
Initial Conditions ◽  
Effective Field ◽  
Fine Tuning ◽  
De Sitter ◽  
Moduli Stabilization ◽  
Nonperturbative Effect ◽  
Initial Conditions Problem ◽  
Field Excursion ◽  
Hubble Time

We study the interplay among extrema of axion potentials, Kahler moduli stabilization and the swampland criteria. We argue that moving away from the minima of nonperturbatively generated axion potentials can lead to a runaway behavior of moduli that govern the couplings in the effective field theory. The proper inclusion of these degrees of freedom resolves the conflict between periodic axion potentials and the gradient de Sitter criterion, without the need to invoke the refined de Sitter criterion. We investigate the possibility of including this runaway direction as a model of quintessence that satisfies the swampland criteria. Using a single nonperturbative effect, the maximum along the axion direction provides such a runaway direction, which is unstable in the axion directions, sensitive to initial conditions and too steep to allow for a Hubble time of expansion without violating the field excursion criterion. Adding a second nonperturbative effect generates a saddle point in the potential satisfying the refined de Sitter criterion, which solves the steepness problem and improves the initial conditions problem although some fine-tuning remains required.

scholarly journals Evil and the god of indifference

2020 ◽  
Vol 88 (3) ◽  
pp. 259-272
Author(s):  
László Bernáth ◽  
Daniel Kodaj
Keyword(s):  
Bayesian Framework ◽  
Problem Of Evil ◽  
Fine Tuning ◽  
Classical Theism ◽  
The Face ◽  
Evidential Problem Of Evil

Abstract The evidential problem of evil involves a rarely discussed challenge, namely the challenge of defending theism against the hypothesis of a morally indifferent creator. Our argument uses a Bayesian framework and it starts by showing that if the only alternative to classical theism is naturalistic atheism, then fine-tuning can render theism virtually certain, even in the face of evil. But if the alternatives include the hypothesis of a morally indifferent creator, theism is defeated even if the fine-tuning premise is accepted. The resulting version of the evidential problem is unsolvable using the tools that are currently deployed by theists against evil.

scholarly journals NONUNIVERSAL GAUGINO MASSES AND NATURAL SUPERSYMMETRY

2013 ◽  
Vol 28 (13) ◽  
pp. 1350046 ◽  
Author(s):  
ILIA GOGOLADZE ◽  
FARIHA NASIR ◽  
QAISAR SHAFI
Keyword(s):  
Standard Model ◽  
Quark Mass ◽  
Higgs Mass ◽  
Mass Range ◽  
Fine Tuning ◽  
Hierarchy Problem ◽  
Light Stop ◽  
High Scale ◽  
Little Hierarchy Problem ◽  
Gaugino Masses

We demonstrate that natural supersymmetry is readily realized in the framework of SU(4)c×SU(2)L×SU(2)Rwith nonuniversal gaugino masses. Focusing on ameliorating the little hierarchy problem, we explore the parameter space of this model which yields small fine-tuning measuring parameters (natural supersymmetry) at the electroweak scale (ΔEW) as well as at high scale (ΔHS). It is possible to have both ΔEWand ΔHSless than 100 in these models, (2% or better fine-tuning), while keeping the light CP-even (Standard Model-like) Higgs mass in the 123–127 GeV range. The light stop quark mass lies in the range [Formula: see text], and the range for the light stau lepton mass is [Formula: see text]. The first two family squarks are in the mass range [Formula: see text], and for the gluino we find [Formula: see text]. We do not find any solution with natural supersymmetry which yields significant enhancement for Higgs production and decay in the diphoton channel.

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