Survey of Issues Misak Sargsian Florida International University

Survey of IssuesMisak Sargsian

Florida International University

Structure of the NucleonStructure of the Nucleon

Nuclear MatterNuclear Matter

Electromagnetic Interaction

Strong Interaction

Quark Degrees of Freedom

Neutron Stars

Pandharipande, Heiselberg, 2000

Microscopic Structure of NN Interactionand properties of Dense Nuclear Matter

Degenerate neutron and electron Fermi Gas

Oppenheimer-Volkoff model, 1939

Observational

Microscopic Structure of NN , NNN, ... Interactions

NN interaction

In the Lab

How to get nucleons close together

Probing at large relative momenta

In the Lab

Day,Frankfurt, MS, Strikman, PRC 1993

Egiyan, et al PRC 2004

Egiyan, et al PRL 2006

What we Learned from A(e,e’)X Reactions

neutron

proton

6p and 6n

rate

calculate the expected proton rate

92% of the time two-nucleon high density fluctuations

are ptoron and neutron

4% of the time proton-proton or neutron-neutron

Piasetzky, Sargsian, Strikman, Frankfurt, WatsonPRL 2006

Important Implication for the structure of the neutron stars

3N Intercation

Relativistic Effects

Effectively Repulsive ?

In the Lab

Chemical Potential and Quantum Field

Classical Thermodynamics for Open Systems

Added energy due to Ni matter introduced to the system

Diffusive Equilibrium

Particles in the Cold Dense Matter

Everything may change when kinetic energy

of NN system exceeds 300 MeV

The system becomes effectively open

Particles which leave the star do not contribute in

Kaon Condensation

Interaction is attractivekaon energy decreases with density

Strangeness Enhancement

In the Lab

The role of in High Density Fluctuations

Role of the Strangeness in High Density Fluctuations

Hyperon N interaction

Chiral Restoration

Chiral Restoration and Hidden Color

In the world where chiral symmetry is broken

Deuteron (t=0,s=1) two nucleons two-separately color neutral objects

In the world where chiral symmetry is unbroken

Signature of Chiral Simmetry Restoration

with an increase of internal momenum in the deuteron

Survey Experiments

with an increase of internal momenum in the deuteron

Quark Matter

Estimates done within Bag Model

In the Lab

Probing superfast quarks

Hard Disintegration

N

N

d

Modification of quark distributions

in nucllei (EMC effect)

α,pt

d

e

e’

x,

Q2