introduction to the modern physics ad to the lnf-infn ... · all permeating higgs field the nobel...
TRANSCRIPT
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Introduction to the
Modern Physics ad to
the LNF-INFN activities
Mini-stage in MP, 4-5 August 2014
Catalina Curceanu
LNF-INFN
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Two “scientific revolutions” in the 20th
century:
• Theory of Relativity
• Quantum Mechanics
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Speaks about events occurring in space and time
Relates these events
for
Reference systems
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Special Relativity
Einstein, Lorentz, Poincaré
(1900 1905)
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NEWTON
I. Absolute TIME.
II. Absolute SPACE
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GALILEO
Equivalence between 2 inertial reference systems
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x = x – v t
y = y
t = t
m is the same
x
y y
x
v
• P ( x, y)
( x, y )
O O ( t = 0 O O )
F = m d2 x d t2 = m
d2 x d t2 = F
Galileo laws
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BUT at very high speed (-> light speed)
Strange things happen….
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Earth was supposed to move in ether
t1 : B – E – B
t2 : B – C – B
B
C
E
L
L
D F
in fase
Interferometer
u
E’ B’
C’
F’ D’
sfasati
Michelson & Morley (1887)
2L / c
1 – u2 / c2 t1 =
2L / c t2 =
(1 – u2 / c2 ) ½
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Experimental observation:
∆t =t1-t2 = 0
Light speed is the same no effect due to Earth
moving in ether
Two possible alternatives:
1) Light does not propagate in the same way in various
reference systems – not same physics (Maxwewll
laws)
2) Galileian transformations are not valid!
Michelson & Morley
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Einstein
(1905)
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First picture of Einstein
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Einstein –Aarau public school
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Einstein at Yekes Observatory - 1921
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Einstein and music 1929
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Einstein:1945
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Einstein and Thomas Mann
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Einstein and Charlie Chaplin
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Einstein – last work
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Theory of relativity – postulates:
P1 - laws of physics are the same in all inertial reference systems IRF
Than Maxwell eq. are ok if and only if:
P2 - speed of light is the SAME in all IRS
Ether does not exist (not necessary)
Einstein (1905)
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Time dilation
Distance contraction
Space and time
are part on an
unique quantity
Space-time
x = ( x – v t )
y = y
t = ( t – v x / c 2 )
x
y y
x
v
• P
( x, y) ( x, y )
O O
(>=1) = ( 1 – v2 / c 2 ) - ½
Consequences of P2
L = L/
dt = dt
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Length contraction
• 10% speed of light
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• 86% c
Length contraction
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Length contraction
• 99% c
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Length contraction
• 99.99% c
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Relativity is NOT an exotic
theory
IT REALLY WORKS!!!
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The Global Position System
(GPS)
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GPS
Satelites are moving !!!
D ~ 20,200 km v2/(D+Re) = G Me/(D+Re)
v = 3.87 Km/s
Dt - D t0 = (1 - ) Dt ~ 5 10-12 s
Needs relativity
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The Global Position System
(GPS)
1 orbit ~ 12 hours
t01 – t01’ ~ 6 10-8 s
DD ~ 18 m
v = 3.87 Km/s
t01 – t01’ = (1 - ) t01
And general relativity (gravity)
DD ~ 100 m
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Particle accelerators
v > 0.99 c
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Les Demoiselles
d'Avignon:
Picasso's 1907
excursion into
a fourth dimension
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Girl in a chair
Picasso's 1907
indagine nella
quarta dimensione
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The Persistence of memory, Salvador Dali, 1931
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For very small objects
(as particles, atoms, molecules…)
Heisenberg in 1925, 24 years old
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Conferenza di Solvay (1927)
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Interference
“…the heart of quantum mechanics.
In reality it contains the only mystery
...” R.P.Feynman (1965)
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Interferenza da due sorgenti
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Single particle interference
parete a
2 fenditure
Sorgente
A
B
schermo
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parete
Sorgente
A
B
otturatore
Single particle interference
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parete
Sorgente
Probabilità
di rivelare
una particella
PA(x)
A
B
otturatore
Single particle interference
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parete
Sorgente Probabilità
di rivelare
una particella
PB(x)
A
B
otturatore
Single particle interference
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parete
Sorgente
A
B Probabilità
di rivelare
una particella
P(x) = PA(x) + PB(x)
What happens when both
“doors” are opened?
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Quantum interference
A
B
Probabilità totale
di rivelare
una particella
P(x)
Frange di
interferenza
The particle passes from BOTH doors!!
Sorgente
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Interferenza da due sorgenti
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Schrodinger cat
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Teleportation: Phantasy or reality?
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F.Riggi, Microcosmo e macrocosmo, Vacanze studio Gennaio 2002
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The atom in the beginning of ‘900 The Thompson’s atom
Rutherford e Bohr - atom
Quantum mechanics - atom
The nucleus structure The nucleus today
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Higgs
boson
Z boson
W boson
photon
g gluon
t tau
n t t-neutrino
b bottom
t top
m muon
n m m-neutrino
s strange
c charm
e electron
ne e-neutrino
d down
up u
Le
pto
ns
Quark
s
!!!
Fermions Bosons
The Standard Model
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The fundamental forces
Force Intensity
Weak 1029 Weak decays:
n p + e- + n
Electromagnetic 1040 Hold atoms as a whole
Strong 1043 Hold nuclei as a whole
Gravitation 1 Keeps you on the chair
Effect
Z boson
W boson
photon
g gluon
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abell2218 blu
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Galassie a Spirale
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Galassie Ellittiche
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Galassie Lenticolari
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Galassie Irregolari, come la Nube di Magellano
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10 anni luce
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100 anni luce
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1000 a. l.
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10 000 a. l.
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100 000 a. l.
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1000 000 a. l.
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10 000 000 a. l.
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100 000 000 a. l.
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1 miliardo a. l.
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Istituto Nazionale di Fisica Nucleare
The INFN promotes, coordinates and performs
scientific research in the sub-nuclear,
nuclear and astroparticle physics, as well as
the research and technological development
necessaries to the activities in these sectors,
in strong connection with the University and
in the framework of international cooperation
and confrontation
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1951 4 University Sections
Milano, Torino, Padova, e Roma
1957 Laboratori Nazionali di
Frascati
Frascati
La nascita dell’INFN
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Laboratori del Sud
(Catania)
19 Sections
11 Related Groups
4 National
Laboratories
INFN today
VIRGO-EGO European Gravitational Observatory
Legnaro Gran Sasso
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Fundamental research
• Studies of the ultimate matter structure
• Search for gravitational waves
• Developments of theoretical
models
• Development and construction of particle detectors
• Studies and development of accelerating techniques
• Material studies and bio-medical research
with the synchrotron light
What are the activities performed at Laboratori
Nazionali di Frascati?
• Development and support for computing
systems and nets
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Frascati National Labs (LNF)
Total Staff
of which:
364
Researchers
98
Technologist/
Engineers
57
Technicians
170
Administration/
Services
39
External Users
546
Italian
346
Foreign
200
Visitors
3960
Stages
310
Conference
Workshops
17
Participants
to
Conf. / Work.
776
Master Courses
1 (27 positions)
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LNF
FLAME
DAFNE
SPARC
BTF
DAFNE-light
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Frascati electrosynchrotron 1959-1975
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Observing on fixed target
• Matter is mainly empty
• All those particles which did not interact get lost
• Energy loss by moving the center of mass
• Target is complex
synchrotron
LINAC
target S
L
p+/-
e-,e+,p …
p, n, etc
detectors
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First Frascati’s idea
• The non-interacting particles can be re-used in the
successive rounds
• Collisions are performed in the center of mass frame
• The circulating particles can be either elementary or
complex (nuclei or atoms)
detector
Accumulation ring Bruno Touschek
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e+ e-
m-
m+
Second Frascati’s idea
t +
t -
e-
e+
E = 2me c2 E = 2mm c2 E = 2mt c2
E = m c2
Bigger the energy is, more and more
particles can be studied
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Matter-antimatter colliders
ADA a Frascati 1959
ADONE a Frascati nel 1969
DAFNE LEP al CERN di Ginevra 1988
LHC at Cern (pp)
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FINUDA
DAΦNE
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Out of the electron – positron collisions the Φ meson can be
produced; it decays immediately in other two particles, the K-
mesons (kaons). The kaons can be both neutrals or charged.
F
K
K
e-
e- e- e-
e- e-
e-
e-
e-
e-
The K are the particles used by the three experiments,
DEAR, FINUDA and KLOE, to reach their scientific goals.
The DAΦNE luminosity allows to produce about
10000 K in a second
e+
e+
e+
e+
e+
e+ e+
e+
Physics at DAΦNE
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The DEAR experiment
investigates the strong
force by studying the
kaonic atoms (in which a K-
is substituting an atomic
electron).
DEAR/SIDDHARTA (DAΦNE Exotic Atom Research)
K-
p
Kaonic hydrogen
n=25
n=2
n=1
2p 1s (Ka )
X ray of interest
SDDs
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KLOE (K LOng Experiment)
KLOE studies the differences
between matter and antimatter
in the kaon decay processes
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Light (photons)
Charged
particle
European Synchrotron
Radiation Facility
Synchrotron light (DAΦNE-luce)
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Laser of high power (> 100 TW), able to produce pulses of 6 J in 20 fs at 10 Hz
FLAME:Frascati Laser for Acceleration and
Multidisciplinary Experiments
Started
December 2010
1)If FLAME beam is injected into a gas the electrons inside get highly
accelerated (new acceleration technique)
2)If FLAME beam is colliding head-on with an electron beam (SPARC) an
intense source of X rays is produced
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1) New acceleration technique
In few cm electrons get accelerations as in present accelerators of hundred
meters
L’impulso laser produce nel plasma
un’onda di scia simile a quella che
lascia dietro di sè un’imbarcazione
Su quest’onda parte degli elettroni
del plasma acquistano energia come
un surfista che cavalca un’onda.
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Electron beams from Linac (SPARC) with energies about 25-50 MeV collide with
FLAME beam
2) Intense X rays source
Resulting in
monochromatic X ray
beams with energies
between 20 and 800
keV
.
Medical diagnosis and material science
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Medical diagnosis
Mamography
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Gravity force`
Distortion of space-time
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The electromagnetic waves
are produced by an electric
charge in movement
Gravitational waves are
produced by masses in
movement….
Antenna Butta la
pasta!
Gravitational waves: an analogy
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Gravitational waves The gravitational waves have an intensity 1040
times smaller than the electromagnetic one
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• Supernova in our Galassia h=10-18
• Supernova in Virgo h=10-21
• Thermal noise @ T=300 K, DL=10-16 m
• Thermal noise @ T=3 K, DL=10-17 m
• Thermal noise @ T=300 mK DL=10-18 m
Search for gravitational waves:
NAUTILUS
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Large Hadron Collider
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Large Hadron Collider
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J. Nielsen 106
Higgs Decay to Photons
Rare decay in SM
LHC detectors have
been optimized to
find this peak!
H t
t
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All permeating Higgs field
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All permeating Higgs field
The Nobel Prize in Physics 2013 was awarded jointly to
François Englert and Peter W. Higgs "for the theoretical
discovery of a mechanism that contributes to our
understanding of the origin of mass of subatomic
particles, and which recently was confirmed through the
discovery of the predicted fundamental particle, by the
ATLAS and CMS experiments at CERN's Large Hadron
Collider“ – Francois Englert, Peter Higgs
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Einstein – last black-board
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String theory
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Einstein quotes
Try not to become a man of success, but rather try to become a man of value.
There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.
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NAUTILUS
ATLAS
Auditorium
ADA e ADONE
KLOE
OPERA
DAFNE
Centro di
Calcolo
FISA
BTF DAFNE-L
FINUDA
DEAR
Laboratori Nazionali di Frascati, info: http://www.lnf.infn.it/sis/