scholarly journals Metastable strings and dumbbells in supersymmetric hybrid inflation

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Wilfried Buchmüller
Keyword(s):  
Gravitational Wave ◽  
Topological Defects ◽  
Supersymmetric Model ◽  
Electroweak Symmetry ◽  
First Case ◽  
The Standard Model ◽  
Hybrid Inflation ◽  
Two Phases ◽  
The Right ◽  
Gravitational Wave Background

Abstract We study symmetry breaking and topological defects in a supersymmetric model with gauge group U(2), which can be identified with the right-handed part SU(2)R× U(1)B−L of an extended electroweak symmetry of the Standard Model. The model has two phases of hybrid inflation terminated by tachyonic preheating where either monopoles and strings or, alternatively, dumbbells are formed. In the first case a stochastic gravitational wave background is predicted in the LIGO-Virgo band, possibly extending to the LISA frequency band and to nanohertz frequencies, which is generated by a metastable cosmic string network. In the second case no topological defects survive inflation and no stochastic gravitational wave background is produced.

scholarly journals A SUPERSYMMETRIC MODEL WITH THE GAUGE SYMMETRY SU(3)1 × SU(2)1 × U(1)1 × SU(3)2 × SU(2)2 × U(1)2

2003 ◽  
Vol 18 (14) ◽  
pp. 967-975 ◽  
Author(s):  
J. G. KÖRNER ◽  
CHUN LIU
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Supersymmetry Breaking ◽  
Simple Form ◽  
Electroweak Symmetry Breaking ◽  
Supersymmetric Model ◽  
Electroweak Symmetry ◽  
Gauge Groups ◽  
The Standard Model

A supersymmetric model with two copies of the Standard Model gauge groups is constructed in the gauge mediated supersymmetry breaking scenario. The supersymmetry breaking messengers are in a simple form. The Standard Model is obtained after first step gauge symmetry breaking. In the case of one copy of the gauge interactions being strong, a scenario of electroweak symmetry breaking is discussed, and the gauginos are generally predicted to be heavier than the sfermions.

scholarly journals Gravitational wave background from reheating after hybrid inflation

2008 ◽  
Vol 77 (4) ◽  
Author(s):  
Juan García-Bellido ◽  
Daniel G. Figueroa ◽  
Alfonso Sastre
Keyword(s):  
Gravitational Wave ◽  
Hybrid Inflation ◽  
Gravitational Wave Background

DETECTION OF GRAVITATIONAL WAVES FROM INFLATION

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 116-128 ◽  
Author(s):  
MARC KAMIONKOWSKI ◽  
ANDREW H. JAFFE
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Large Scale ◽  
Planck Scale ◽  
New Physics ◽  
Energy Scale ◽  
Grand Unification ◽  
Microwave Background ◽  
The Right ◽  
Gravitational Wave Background

Recent measurements of temperature fluctuations in the cosmic microwave background (CMB) indicate that the Universe is flat and that large-scale structure grew via gravitational infall from primordial adiabatic perturbations. Both od these observations seem to indicate that we are on the right track with inflation. But what is the new physics responsible for inflation? This question can be answered with observations of the polarization of the CMB. Inflation predicts robustly the existence of a stochastic background of cosmological gravitational waves with an amplitude proportional to the square of the energy scale of inflation. This gravitational-wave background induces a unique signature in the polarization of the CMB. If inflation took place at an energy scale much smaller than that of grand unification, then the signal will be too small to be detectable. However, if inflation had something to do with grand unification or Planck-scale physics, then the signal is conceivably detectable in the optimistic case by the Planck satellite, or if not, then by a dedicated post-Planck CMB polarization experiment. Realistic developments in dector technology as well as a proper scan strategy could produce such a post-Planck experiment that would improve on Planck's sensitivity to the gravitational-wave background by several orders of magnitude in a decade timescale.

Adult-to-Adult Living-Donor Liver Transplantation

Swiss Surgery ◽  
2003 ◽  
Vol 9 (5) ◽  
pp. 227-236 ◽  
Author(s):  
Majno ◽  
Mentha ◽  
Berney ◽  
Bühler ◽  
Giostra ◽  
...  
Keyword(s):  
Liver Transplantation ◽  
Living Donor ◽  
Living Donor Liver Transplantation ◽  
Therapeutic Option ◽  
Donor Liver ◽  
Donor Liver Transplantation ◽  
Multidisciplinary Program ◽  
First Case ◽  
Living Donor Transplantation ◽  
The Right

Living donor liver transplantation is a relatively new procedure in which the right side of the liver is harvested in a healthy donor and transplanted into a recipient. After the first case in 1994, over 3000 cases have been done worldwide. This review summarizes the reasons why the procedure is needed, describes its main technical aspects, highlights the boundaries in which it can be done safely, summarizes the current experience worldwide and describes the main points of the program in our unit. We argue that living-donor transplantation is a viable alternative to a long time on the waiting list for several patients, and it can be performed safely and successfully provided that all precautions are undertaken to minimize the risks in the donor and to increase the chances of a good outcome in the recipients. If these prerequisites are met, and within the framework of a structured multidisciplinary program, we believe that living-donor liver transplantation should be funded by health insurances as a recognized therapeutic option.

scholarly journals Primary Gastrointestinal Stromal Tumor of the Liver with Cystic Changes

2019 ◽  
Vol 13 (1) ◽  
pp. 58-65
Author(s):  
Takashi Tashiro ◽  
Fumihiro Uwamori ◽  
Yukiomi Nakade ◽  
Tadahisa Inoue ◽  
Yuji Kobayashi ◽  
...  
Keyword(s):  
Liver Tumors ◽  
Past History ◽  
Brain Infarction ◽  
Arterial Phase ◽  
First Case ◽  
Positron Emission ◽  
Cystic Changes ◽  
Multiple Bone Metastases ◽  
The Right ◽  
Cells Of Cajal

Gastrointestinal stromal tumors (GISTs) are known to originate specifically from the intestinal cells of Cajal located in the gastrointestinal mesenchyme. GISTs developing outside of the digestive tract have barely been reported. We encountered a first case of large primary GISTs in the liver with cystic changes. A 63-year-old man with a past history of brain infarction visited our hospital. The computed tomography (CT) revealed a 6-cm and a 10-cm mass in the right and the caudal lobe of the liver, respectively. These tumors have marginal enhancement in the arterial phase; however, they presented as hypodense in the internal tumor sites. Both liver tumors had cystic changes. Gastrointestinal examinations using endoscopy revealed no other gastrointestinal tumors, and [18F]-fluoro-2-deoxy-D-glucose positron emission tomography/CT revealed multiple bone metastases in addition to the liver tumors. The liver tumor specimens were composed of spindle cells, and the immunohistochemical staining for c-Kit and for DOG1, as discovered on GIST, was positive. The patient was diagnosed with primary hepatic GIST with cystic changes.

scholarly journals Emphysematous pyelonephritis with air bubble in the inferior vena cava

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Tiffany A. Perkins ◽  
Alberic Rogman ◽  
Murali K. Ankem
Keyword(s):  
Septic Shock ◽  
Inferior Vena Cava ◽  
Inferior Vena ◽  
Vena Cava ◽  
Rare Presentation ◽  
Emphysematous Pyelonephritis ◽  
Case Presentation ◽  
Air Bubble ◽  
First Case ◽  
The Right

Abstract Background Emphysematous pyelonephritis (EPN) with gas in the inferior vena cava (IVC) is a rare presentation and to our knowledge, this is the first case report in the urologic literature. Case presentation A 35-Year-old obese diabetic Hispanic female presented to the emergency room with a clinical picture of septic shock. Prompt computerized tomography scan revealed EPN with gas throughout the right renal parenchyma and extending to the right renal vein, IVC, and pulmonary artery. She died before surgical intervention Conclusion This case demonstrates that patients presenting with severe EPN have a high mortality risk and providers should acknowledge that septic shock, endogenous air emboli, or a combination of both could result in cardiovascular collapse and sudden death.

scholarly journals A critical look at the electroweak phase transition

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Andreas Ekstedt ◽  
Johan Löfgren
Keyword(s):  
Phase Transition ◽  
Generic Model ◽  
Electroweak Symmetry ◽  
Electroweak Phase Transition ◽  
Gauge Dependence ◽  
Perturbative Methods ◽  
The Standard Model ◽  
Gauge Fixing ◽  
Infrared Divergences ◽  
General Gauge

Abstract The electroweak phase transition broke the electroweak symmetry. Perturbative methods used to calculate observables related to this phase transition suffer from severe problems such as gauge dependence, infrared divergences, and a breakdown of perturbation theory. In this paper we develop robust perturbative tools for dealing with phase transitions. We argue that gauge and infrared problems are absent in a consistent power-counting. We calculate the finite temperature effective potential to two loops for general gauge-fixing parameters in a generic model. We demonstrate gauge invariance, and perform numerical calculations for the Standard Model in Fermi gauge.

Sign in / Sign up

Export Citation Format

Share Document