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SUMMARY:Constraining the Equation of State of Neutron Stars with High Ener
gy Deeply Virtual Exclusive Experiments
DTSTART;VALUE=DATE-TIME:20190411T211500Z
DTEND;VALUE=DATE-TIME:20190411T214000Z
DTSTAMP;VALUE=DATE-TIME:20221006T141448Z
UID:indico-contribution-4064@indico.jlab.org
DESCRIPTION:Speakers: simonetta liuti (university of virginia)\nThe recent
detection of gravitational waves from merging neutron star events has ope
ned a new window on the many unknown aspects of their internal dynamics. A
key role in this context is played by the transition from baryon to quark
matter described in the neutron star equation of state (EoS). In particu
lar\, the binary pulsar observation of heavy neutron stars \nrequires appr
opriately stiff dense matter in order to counter gravitational collapse\,
at variance with the predictions of many phenomenological quark models. \n
On the other side\, the LIGO observations favor a softer EoS therefore pro
viding a lower bound to the equation stiffness. \nWe introduce a quantum c
hromodynamics (QCD) description of the neutron star's high baryon density
regime where the pressure and energy density distributions are directly ob
tained from the matrix elements of the QCD energy momentum tensor. \nRecen
t ab initio calculations allow us to evaluate the energy-momentum tensor i
n a model independent way including both quark and gluon degrees of freedo
m. \nOur approach is a first effort to replace quark models and effective
gluon interactions with a first principles\, fully QCD-based description.
Most importantly\, the QCD energy momentum tensor matrix elements are conn
ected to the Mellin moments of the generalized parton distributions which
can be measured in deeply virtual exclusive scattering experiments. \nAs a
consequence\, we establish a connection between observables from high ene
rgy experiments and from the analysis of gravitational wave events. Both c
an be used to mutually constrain the respective sets of data. \nIn par
ticular\, the emerging QCD-based picture is consistent with the GW170817 n
eutron star merger event once we allow a first-order phase transition from
a low-density nuclear matter EoS to the newly-constructed high-density qu
ark-gluon one.\n\nhttps://indico.jlab.org/event/282/contributions/4064/
LOCATION:Denver\, CO Director's Row H
URL:https://indico.jlab.org/event/282/contributions/4064/
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