MODERN PARTICLE PHYSICS How we got here, and where we’re...

Jim Brau Univ. of Oregon QuarkNet June 28, 2006

MODERN PARTICLE PHYSICS

How we got here, and where we’re going

Mysteries of the Universe

• Quarks• Leptons• Higgs Bosons• Supersymmetric

Particles• SuperString

Theory

• Dark Matter• Dark Energy

and the cosmological constant

• Accelerating Universe

• Gravity Waves• Extra Dimensions

The End of Physics

Albert A. Michelson, at the dedication of Ryerson Physics Lab, U. of Chicago, 1894

The Miracle Year - 1905

RelativityQuantum PhysicsAtoms

1915 -General Theory of Relativity,the theory of gravity, based on warped space

Missing from understanding of the Universe in 1905?

Physics in 1905

Quantum MechanicsNuclear Physics

Elementary Particles

Missing from understanding of the Universe in 1905?

Physics in 1905

Edwin Powell Hubble (1889-1953)

Einstein’s Theoretical Discoveries– Light comes in small packets - photons

– The speed of light is a constant• Independent of observer’s motion

Einstein’s Theoretical Discoveries– Light comes in small packets - photons

– E=mc2

– Space is warped by massive objects

– “Cosmological constant”

– Many others

– Light comes in small packets - photons

– E=mc2

– Space is warped by massive objects

– “Cosmological constant”

– Many others

• Remain central to our exploration of the universe

Einstein’s Theoretical Discoveries

•xx•xx

Einstein and Quantum Mechanics

Quantum Mechanics and Gravity

Inconsistent?

Einstein’s Dream

• To understand the underlying simplicity behind the vast complexities of Nature

Suspected gravity was a key

Unification

Understand how nature’s forces are relatedelectricity, magnetism, and gravityelectromagnetism

Einstein’s Dream Today• Today, STRING THEORY

– Unifies all forces– Overcomes inconsistencies between

gravity and quantum mechanics• Ultimate Explanation?

– from the tiniest quanta to the cosmos

• The Dream Lives On

• There are encouraging signs that success is near

The Universe is Mysterious, but Comprehensible

Willamette HallNo doubt about it

Desh – we’ve mathematically expressed the purpose of the

universe. God, how I love

the thrill of scientific discovery

The Next RevolutionToday on the threshold of a revolution in understanding of the Universe

Recent discoveries

and powerful set of tools:

• What is the universe made of?– Ordinary matter and the known forces? Or more?

• How does it work?– From the sub-atomic to the cosmic scale

• How many spatial dimensions are there?– Just 3, or more (hidden dimensions)

• Why does matter have mass?• What was the Big Bang?

The Frontier NowThe Frontier Now

Convergence of the Large and the Small

Modern scientific instruments

FermilabFermilab, near Chicago, near Chicago

Stanford Linear AcceleratorStanford Linear Accelerator

LIGO Laboratory, HanfordLIGO Laboratory, Hanford

Hubble Space TelescopeHubble Space Telescope

Cerro Cerro TololoTololo, Chile, Chile

• probe laws of the cosmos in 2 ways

1. Super-microscope

2. Creation of massive matter (E=mc2)Heavy ordinary matterDark Matter

Particle Accelerators

← ANTI-PROTONPROTON →

What is matter?

• All matter we are familiar with is composed of atoms, or parts of atoms– Living things – butterflys, elephants, people …– Inanimate things – rocks, watches, cannonballs …– Astrophysical objects – planets, moon, stars,

asteroids …Even cosmic rays!

What is matter?Experiments with particle colliders have

advanced our detailed understanding of matter and how it behaves

What is matter?• Quarks

– combine to make protons and neutrons

• Leptons– eg. electron, neutrino

• Force Carriers– defines behavior of matter

We have a precise understanding of matter and its behavior

The Structure of Matter

Are atoms alone a sufficient basis for explaining the Universe?

No – not even close

Halo of Dark Matter

How do we know that galaxies are surrounded by dark halo?

Galaxies are spinning too fast to be held together by gravity of the stars

Vera Rubin1950s

• 1930s motions of clusters of galaxies cannot be understood – Fritz Zwicky

• 1990-2000s Refined studies show dark matter dominance

Dark Matter Evidence

• 1930s motions of clusters of galaxies cannot be understood – Fritz Zwicky

• 1990-2000s Refined studies show dark matter dominance

Imaging Dark Matter

Hubble Data analyzed by Yale astrophysicists

Observing Galaxies• There must be a dominant presence of a

dark form of matter

– It is invisible!– We “see” it through gravitational effects

– this is the only way we know it exists– What is it?– Is it just faint, ordinary matter?

• Most likely not - Promising candidate - exotic type of fundamental

particle which is anticipated by particle theory• Supersymmetric particle (Neutralino)

Symmetries of particles

• 1928, Paul A.M. Dirac – Theory of the electron– Combining relativity and quantum mechanics

• He needed to assume there were partner particles for every known particle

• ANTI-MATTER • DOUBLED THE NUMBER OF PARTICLES

Discovery of Anti-Matter

• 1932 -Carl Anderson – The anti-electron,

or positron

All known particles have anti-particles

ELEMENTARYANTI-PARTICLES

SuperString Theory

• Unifies all particles and all forces– gravity with quantum mechanics

• Fundamental particles are represented as vibrations on string

– String is miniscule • Atom is 10,000,000,000,000,000,000,000,000 x bigger

– Space is ten-dimensional (not 3D!)– A matching set of particles appear

• the super-partners of ordinary particles

The Structure of Matter

hypothesis

ELEMENTARYANTI-PARTICLES

Supersymmetry and Strings• History repeats?• Just as for anti-matter,

– New particles are required tomake successful theory

• The supersymmetric particles have just the properties expected of Dark Matter

The Universe

Another puzzle What gives matter mass?

• An ocean of Higgs Bosons - “Higgs Field”

Large Hadron Collider (LHC)Geneva, Switzerland

Nearing Completion

Begins operation in 2007

International Linear Collider (ILC)

Under development

Planned to begin operation soon

after 2015

30 Miles

The Big Bang

• Fundamental Physics needed to understand Big Bang

The Cosmic Fireball

• Visible remnant of the Big Bang – microwaves in the sky– traveling through space for 14 billion years

Microwaves in the sky

Probing the Big Bang

• Studied since 1965 discovery

• Series of increasingly more sensitive experiments

• Lastest - WMAP

• Analysis of the WMAP data is equivalent to “weighing” the universe

• The stars are a very small fraction

Energy ofOur

Universe

•Additional ordinary matter,Still a small fraction

•Anti- matter miniscule

• The dominant “weight” of the universe is dark matter and dark energy

•Dark Energy Surprise•Related to Einstein’s Cosmological Constant

The Dark Side Controls the Universe

Dark Matter HOLDS IT TOGETHER

Dark Energy DETERMINES ITS DESTINY

Dark Matter is strange!Dark Matter is strange!What about Dark Energy?What about Dark Energy?

Measuring the Universe’ Expansion

AccelerationDriven by

Dark EnergyAfter Supernova After Supernova After Supernova

• The closest realization of “nothing” is the vacuum – “empty space”

• Quantum physics -> no truly empty space• “Empty space” filled with temporary particles

The Dark Energy Something from Nothing Dark

EnergyDark Matter

Empty Space

The Dark Energy Something from Nothing

Dark Energy

Dark Matter

Quantum Fluctuations Create a “Dark Energy”– Cosmological constant

The Dark Energy Something from Nothing

Dark Energy

Dark Matter

Something from Nothing

• We can calculate the effect of these virtual particles on Dark Energy– This theoretical result is too big

– This is a BIG-time mystery • we know how the universe might make Dark

Energy, but we don’t know how to make so little

– By a factor of 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

Seeking the Primordial Gravity Waves

• The fabric of the universe is still rattling from the violent Big Bang

. . . . . . .. . . . . . . . . . . . . .. . . . . . . . . . . .

. . . . . . . . . . . . . . . .

. . . . . . . . . . .. .. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . .

Primordial Gravity Waves

• LIGO looks for evidence of gravity waves

Hanford LIGO

Gravity Waves Probe the Extremely Early Universe

14 billion

Extra Dimensions• String Theory

– 10-dimensional space

• Particle Collider Experiments are looking for these hidden dimensions

Our Mysterious Universe

Realizing Einstein’s Dream

• We are on the eve of a revolution in physics– Many mysteries – Solutions appear near – Deeper understanding of the universe itself

• Gravity waves may image earliest moments of Big Bang

• Dark Matter particles – may appear soon in particle collider experiments at accelerators

• Why is there mass? – Higgs Boson• Dark Energy – this is the biggest mystery of all

Acknowledgements

RESEARCH SUPPORTED BY

Department of EnergyOFFICE OF SCIENCE

NATIONAL SCIENCE FOUNDATION

MODERN PARTICLE PHYSICS How we got here, and where we’re...

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