the mysterious dark matter and dark energy in our cosmos · doug singleton, csu fresno august 2nd,...
TRANSCRIPT
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Doug Singleton, CSU Fresno
August 2nd , 2018 Universidad de Colima
The Mysterious Dark Matter and
Dark Energy in our Cosmos
SNe 1994D (HST)
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ANCIENT GREEK COSMOLOGY
RENAISSANCE COSMOLOGY
MODERN COSMOLOGY
DARK MATTER & QUINTESSENCE
COMPOSITION OF THE UNIVERSE
CONCLUSIONS: ANCIENT X MODERN
PLAN OF THE TALK
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1. Greek Philosophy & Cosmology
Socrates (469-399 B.C.)
PreSocratics: Thales, Heraclitus,
Pythagoras, Parmenides, Zenon, Empedocles,
Filolau, Anaxagoras, Diogenes…
Thales (624-546 B.C.) Water - the basic element!
Empedocles : Water, air, earth & fire (4)
Filolau & others : 4 + Quintessence/Aether
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3 GREEK COSMOLOGISTS
COSMOS = SOLAR SYSTEM + STARS
ImprovedGeocentric Model - Unified the system of
Epicycles, Equants and Deferents. 13-
volume series book – ALMAGEST!
Eudoxus (408-355 B.C.): Model
around anwith 27 spheres rotating
stationary earth
Aristotle (384-322 B.C.):
Model with 55 Spheres
Ptolemy (90-160 A.D.):
?
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Aristotle (384 – 322 B. C.)
Major Figure of Greek Science
Politics,Ethics,History,Physics,Biology,Logic!
Cosmological Propositions:
Universe is Finite, Spherical and limited by the Stars Sphere
The Center of the Universe is the Earth, Spherical and Inert
Each Planet and also the Moon/Sun have their own Sphere
Neither vacuum nor time exist outside the Sky!
5 elements: Water, Air, Earth, Fire & Aether (Quintessence)
Quintessence is the matter of the celestial bodies
Geocentrism: Standard Cosmological
model for 16 Centuries!
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Q: WHY WAS THE 5TH ELEMENT
(QUINTESSENCE) PROPOSED BY
THE GREEKS?
A: Because the moon seems to be heavy
but does not move to the center of the Earth
(Heavy bodies fall to the center of the Universe!)
Roughly speaking Quintessence was
hypothesized in order to solve a
problem of acceleration!
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Purgatory
PARADISE THE EMPYREAN
HELL
JERUSALEM
Divine Comedy - Dante Alighieri (1320)
Greek Legacy
Christian View+
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2. RENAISSANCE COSMOLOGY
Copernicus (1473-1543): Heliocentrism
Tycho Brahe (1546-1601): Precision
Astronomical Observations!
COSMOS ?
Giordano Bruno (1548-1600): Defense of an Infinite Universe. Earth was not the center.
“Other Universes”
Heretic - Executed in Rome (burned at the stake!)
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KEPLER (1571-1630): Empirical Laws
describing the planetary motion
GALILEO (1564-1642)
Defense of Copernican
Cosmology (Telescope)
NEWTON (1642-1727): Universal Gravitation
Newtonian Cosmology (1692): “ The
Universe must consist of a large amount of masses
separated by large distances, that is, the Universe is
Infinite (Euclidean) with the matter concentrated in
parts due to the gravitational attraction”
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3 laws of motion plus the lawof
Gravitation explained many
different phenomena....
• Motion of the planets around the
Sun
• Orbits of the Comets
• Fall of bodies, Tides, etc.
Solved the majority of problems
in Astronomy and “terrestrial
physics”.
The Newton laws unified and generalized the works of Copernicus, Tycho Brahe, Kepler and Galileo.
Infinite Universe Without Quintessence!
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3. COSMOLOGY IN THE 20th CENTURY
DISCOVERY OF
THE UNIVERSE
EXTENSION AND
ITS
COMPLEXITY!
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MODERN COSMOLOGY...
EINSTEIN
FRIEDMANN
HUBBLE
PENZIAS-WILSON
SUPERNOVAS
QUINTESSENCE?
(DARK ENERGY)
1917 Static Universe
1922 Big-Bang Model
1929 Expansion Discovery
1965 Radiation of 3 K
1998 Accelerating Universe
Contemporary
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BUT ! Einstein thought the Universe was Static.
In1917, to permit a
static, non - expanding
Universe, Einstein
invented the
“Cosmological Constant”
Λ
Later was discovered that
the Universe was
expanding!
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The Expanding Universe
Zs. f. Phys. 10, 377, 1922
A. A. Friedmann (1888-1925)
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Repercussion of Friedmann’s Article
Zs. f. Phys. 11, 326, 1922
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Finally!
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Open
Time70 Billions yrs
Sca
lefa
cto
ra
(t)
Flat k=0
Einstein-de Sitter (1931)
Closed k=1
(Friedmann, 1922)
(Friedmann, 1924)
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The Early Universe Was
Smaller , Denser , Hotter
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sEdwin Hubble (Expansion – 1929)
vH0d (H0 Hubble'sconstant)
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THE OBSERVED UNIVERSE
• Basic Cosmological Parameter:
H0 - Hubble Constant
q0 - Decelerating Parameter
i - Density Parameter
22a 0 H0
k 1 i total
i
oa
ttoH
a|
o ttoa2q
aa|
c
i tto
i |B , , , DM , Q, tot
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PROBLEMS IN COSMOLOGY
Universe with 3 known substances (1970)
1) Normal Matter (electrons & nucleons)
2) Radiation (CMB)
3) Neutrinos
2 Unknown (and Strange) SubstancesDARK SECTOR!
DARK MATTER (1972)
DARK ENERGY QUINTESSENCE (1998)
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• Beware of the Dark Side…
Master Yoda
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On the Dark Sector...
How do we know that
Dark Matter exists?
We infer the DM existence through its
influence on gravitationally bounded
systems in several scales of interest
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Rotation Curve M33
R (kpc)105
v (km/s)
100
50
Expected from
Luminous disk
observed
DM 1. Galaxy Rotation Curves
V(r) = [GM(r) /r]1/2
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30
DM 2: Gravitational Lensing in Clusters
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What is the nature of Dark Matter?
Dark Matter is nonbaryonic!
b 0.04
0.5 bDM
Primordial Nucleosynthesis (Deuterium)
Late 60’s:
b 0.0449 0.0028
DM 0.222 0.026 b
Compare to WMAP-Planck results (1σ )
Peebles 1968
0.04
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WHAT ABOUT DARK ENERGY?
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1998
18 December 1998
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Measuring Distances By Brightness
Use Supernovae As
Standard Light Bulbs
LUMINOSITY DISTANCE
For “Standard” Light Bulbs
Faint Distant
Bright Close
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35
Distances with SNe Ia (main advantages)
SNe are “Light Balls” ! LSNe 1010 LSol
Their luminosities (L) and (F) are known
Spectral Information redshift z
The Hubble diagram can be drawn (H0 , q0)
Unified Sample (740 SNe) – Amanullah et al. ApJ, 2014
Information on the density parameters (ΩM, ΩΛ)
The best standard candles (1998 – 2016)
Ideal to estimate cosmological parameters
L
L)1/2
4Fd (
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Supernova is the Explosion of a Star
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Riess et al astro-ph/9410054
Hubble’s
data
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85 SNe
local13 Distant
SNe1 Very
Far
1998: Acceleration! (Riess et al. 1998)
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1) Acceleration
2) Subtraction
TOTAL= 1 (CMB)
Models with
= 0.3 (LSS + …)
= 1 0.3 = 0.7
Present View
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Descoberta!
PerlmNobuel Ptterize -
2r011– Schmidt
- Riess
19
98
Visão Corrente
1998
Perlmutter – Schmidt - Riess
Nobel Prize - 2011
Present View
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41
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SOURCE OF ACCELERATION?
•Normal Matter implies deceleration
because Gravity is an attractive force!
• Negative Pressure accelerates the Universe
(RELATIVISTIC EFFECT! )
• Quintessence:
The energy density is positive but
its pressure is negative.
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scale
facto
ra(t
)
time
Newton
a G 3panormal
3p 0Einstein
Dark Energy?
a 0
3p 0
acceleration
time
a 0
scale
facto
ra(t
)
Negative
Pressure!
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Lensing
CMBSNe Ia
X- Ray
LSS
DE 70%
DM 25%
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Quintessence:
70%
Stars:
0.5%
Hydrogen +
Helium: 4%
Heavy
Element:
0.03%
Dark Matter:
25%
Neutrinos:
0.3%
Composition
of the Cosmos
?
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CONCLUSION
Basic vision of the Cosmos changed with the
development of Physics and Astronomy:
• The current Universe is accelerating (1998)
• Supernovas are the best probe (other evidences)
• 2 unknown substances: DM/DE (Quintessence)
Greeks were partially correct! TheUniverse has 5 basic “elements”:
Photons, Baryons, Neutrinos,
Dark Matter and Quintessence!
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THANK YOU!
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25
Martins, Lima & Chimenti MNRAS 2015
Rotation Curves for 24 galaxies
Gas -
Stars –
DM -
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Distant galaxy
Observer
Galaxy clusters
(Gravitational lens)
Light rays are deflected by gravity
Dark Matter 2: Gravitational Lensing
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c2 R
4GM
Light ray equation: u2
c2
3GMd 2uu
d 2
1 , 7 5 ' ' d e a r c o
Evidence 2. Gravitational Lensing
Aparent Position
Real position
relativistic correction
M
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Fonte
Observador
Lens
GRAVITACIONAL LENSING
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Image
ImageLens
Observer