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CEA Irfu – Mois 2011 – 1
CEA Irfu
How a relativistic metric of the earth including a full density profile does affect the neutrino transport?
Olivier Besida
CEA/IRFU/SPP
CEA Irfu – Mois 2011 – 2
Gravitation potential with a uniform density earth
V=GM/r
V= GM(r)/2r3/2GM/R
Naive model
CEA Irfu – Mois 2011 – 3
Toward a Schwartzschild metric inside earth
Hypothesis: no rotation, spherical symmetryStep 1: the metric
V is identified as the Newtonian Gravitational Potential
CEA Irfu – Mois 2011 – 4
Toward a geodesic (step1)
CEA Irfu – Mois 2011 – 5
Toward a geodesic (step 2)
AB
r0
rArB
CEA Irfu – Mois 2011 – 6
Computing time along the geodesic
AB
r0
rArB
CEA Irfu – Mois 2011 – 7
Poisson, Gauss and the gravitational potential
CEA Irfu – Mois 2011 – 8
Density inside earth PREM
rearth=6371km
PREM (Preliminary Reference Earth Model) Dziewonski et Anderson (1981)
Adams–Williamson equation
CEA Irfu – Mois 2011 – 9
Gravity acceleration inside earth
CEA Irfu – Mois 2011 – 10
Gravitation potential PREM
CEA Irfu – Mois 2011 – 11
Gravitation potential PREM inside Earth
CEA Irfu – Mois 2011 – 12
Delay on CERNOPERA neutrino (PREM)
delay=4.1811picoSecondDelay length =1.25433 mm
baseline=730kmSpherical symmetryPREM density modelRotation : ignoredEllipsoidal earth : ignoredGeoid fluctuation : ignoredHeight over surface : ignored1.E+08 iterations
CEA Irfu – Mois 2011 – 13
Effect on CERNOPERA neutrino (PREM)
baseline=730kmSpherical symmetryPREM density modelRotation : ignoredEllipsoidal earth : ignoredGeoid fluctuation : ignoredHeight over surface : ignored
General relativity effect=1.71827e09
CEA Irfu – Mois 2011 – 14
Neutrino delay versus baseline through earth
635km
CEA Irfu – Mois 2011 – 15
General relativity effect inside earth travel
635km
CEA Irfu – Mois 2011 – 16
To be added: WGS 84 Ellipticity of the earth
NOT YET INCLUDED
CEA Irfu – Mois 2011 – 17
To be added: GEOID EGM96 or EGM08
CEA Irfu – Mois 2011 – 18
Gravity deviation from theoretical ellipsoid EGM08 (NASA/GRACE)
CEA Irfu – Mois 2011 – 19
To be added: Bouguer and free air anomaly correction
Land surface (above geoid):
Land subsurface (above geoid):
LNGS=> h=2400m d=1400mCERN=>h=450m d=100m
CEA Irfu – Mois 2011 – 20
Conclusion
A spherical metric was developped describing gravity inside earth usingPREM density model
The calculation of the geodesic CERN to Opera was computedbaseline=730kmdelay=1.25mm=4.18 picoSecondeffect=1.718E09No advanced!
Crossing the whole earthbaseline=12700km1 inch effectdelay=2.59cm=86.65 picoSecondEffect=2.04E09
Possible improvements=ellipticity, geoid, Bouguer correctionMaybe the position of minimal gravitational potential is not the closest pointTo the center of the earth
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