Holographic estimate of electromagnetic mass
نویسنده
چکیده
Using the gauge/gravity duality, we calculate the electromagnetic contributions to hadron masses, where mass generates dynamically by strong QCD interactions. Based on the Sakai-Sugimoto model of holographic QCD we find that the electromagnetic mass of proton is 0.48 MeV larger than that of neutron, which is in agreement with recent lattice results. Similarly for pions we obtain mπ± −mπ0 = 1.8 MeV, roughly half of the experimental value. The electromagnetic mass of pions is found to be independent of Nc and ’t Hooft coupling and its scale is set only by the Kaluza-Klein scale of the model, MKK = 949 MeV.
منابع مشابه
The matter spectral density from lensed CMB observations
We use local likelihood estimates of gravitational shear and convergence from lensed cosmic microwave background observations to estimate the projected mass spectral density. Typically there is an additive bias when using a plug-in estimate of the spectral density from a noisy estimate of the random field. We explore the possibility of adjusting this bias by subtracting an approximate power spe...
متن کاملBright branes for strongly coupled plasmas
We use holographic techniques to study photon production in a class of finite temperature, strongly coupled, large-Nc SU(Nc) quark-gluon plasmas with Nf ≪ Nc quark flavours. Our results are valid to leading order in the electromagnetic coupling constant but non-perturbatively in the SU(Nc) interactions. The spectral function of electromagnetic currents and other related observables exhibit an i...
متن کاملGlucose-Sensitive Holographic (Bio)Sensors: Fundamentals and Applications
Nowadays sensors and especially biosensors play an important role in medical diagnosis and detection of food and environment contaminations. Biosensors’ facilities have been improved significantly by using technologies such as surface plasmon resonance, microfluidics, laser, and electrochemistry. These technologies are now available on chips in micro- and nano-scale and are capable of mea...
متن کاملDynamics of Baryons from String Theory and Vector Dominance
We consider a holographic model of QCD from string theory, à la Sakai and Sugimoto, and study baryons. In this model, mesons are collectively realized as a five-dimensional U(NF ) = U(1) × SU(NF ) Yang-Mills field and baryons are classically identified as SU(NF ) solitons with a unit Pontryagin number and Nc electric charges. The soliton is shown to be very small in the large ’t Hooft coupling ...
متن کاملElectromagnetic Baryon Form Factors from Holographic QCD
In the holographic model of QCD suggested by Sakai and Sugimoto, baryons are chiral solitons sourced by D4 instantons in bulk of size 1/ √ λ with λ = gNc. We quantize the D4 instanton semiclassically using ~ = 1/(Ncλ) and non-rigid constraints on the vector mesons. The holographic baryon is a small chiral bag in the holographic direction with a Cheshire cat smile. The vector-baryon interactions...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2015