Fellow Craft
103. Criteria of confinement. Wilson loop - physical discussion
It is often said that the most physically relevant criterion of confinement is the behaviour of the potential between two fermions: confinement implies the linear growth of potential between two charges with distance. (…)
92. A new theory of galaxy formation needed
It is well known that an ordinary galaxy can be described by seven physical parameters: total mass, baryon fraction, age, specific angular momentum, specific heat energy (related to random motion within the galaxy), its radius and concentration. (…)
85. Hard thermal loops: what is it?
Suppose that you are a person studying non-equilibrium diagrammatic methods. (…)
80. Watching worlds collide: bubbles, bubbles, bubbles
Getting tired of malicious attacks by anti-landscapists, Spencer Chang, Matt Kleban and Thomas Levi released a paper about one observable effect on string theory landscape. (…)
53. Eternal inflation: stochastic approach 1 (Inflationary perturbations 7)
In this post I start to discuss physics of eternal inflation - regime where superhorizon cosmological perturbations become of the order 1.
50. Planck 2008: day 4
4th day of the Planck 2008 was devoted to unparticle physics (feat. Howard Georgi himself) and AdS/QCD.
48. Planck 2008: day 3
The third day of Planck 2008 was devoted to experimental side of LHC, physics of hidden sectors, quirks and N=1 SQCD.
45. Quantization of cosmological perturbations. Mukhanov-Sasaki variable (Inflationary perturbations 5)
I introduce Mukhanov-Sasaki variable, show how to quantize inflationary perturbations and again calculate the power spectrum of primordial perturbations - by QFT this time.
44. Cosmological perturbations in the presence of scalar field (Inflationary perturbations 5)
I discuss cosmological perturbation theory in the Universe where the dominant component of matter is a scalar field. It is show that spectrum of inflationary perturbations is nearly flat.
43. Schwinger-Keldysh: Martin-Siggia-Rose diagrammatics (non-equilibrium diagrammatic methods 2)
I start to discuss Martin-Siggia-Rose diagrammatic methods and transition from Fokker-Planck equation back to quasiclassical Schwinger-Keldysh action.
40. Inflation: field-theoretic description (Inflationary perturbations 4)
I discuss simplest field theoretic models of inflation, dynamics of inflation at the level of background and Hamilton-Jacobi formalism for inflation.
33. Schwinger-Keldysh: information carried by Keldysh Green’s functions (nonequilibrium diagrammatic methods 1)
I discuss information carried by Keldysh Green’s functions in the non-equilibrium quantum field theory.
31. Schwinger-Keldysh: brief review (Nonequilibrium diagrammatic methods 1)
I briefly discuss what physical problems require the use of non-equilibrium diagr. QFT methods. I also review the structure of Green functions in SK formalism.
25. Geometry and causal structure of de Sitter space (Inflationary perturbations 4)
I discuss geometry, causal structure and behavior of QFT Green functions in de Sitter space
19. Disorder on the landscape: non-technical intro
Today I will kindly allow myself a bit of selfpromotion As I said yesterday, our paper “Disorder on the landscape” is finally out (by the way, Lubos Motl already has a very nice post about it on his blog). (…)
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