write, don’t radiatebrown.edu/departments/engineering/labs/rose/papers/breakthrough… · 1 write...
TRANSCRIPT
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Write, Don’t Radiate
Chris RoseBrown University
Breakthrough DiscussStanford
April 15, 2016
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1 Write or Radiate?
Phil Kicked SETI Off
Nature 184, pp.844–846, September 19, 1959, Cocconi & Morrison
Brown University Breakthrough Discuss April 2016 C. Rose
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2 Write or Radiate?
Write or Radiate?
Nature 431, pp.47–49, September 2, 2004, Rose & Wright
Brown University Breakthrough Discuss April 2016 C. Rose
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3 Write or Radiate?
SESSION TITLE: Optical SETI and Detectability ofDirected Energy Systems
Brown University Breakthrough Discuss April 2016 C. Rose
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3 Write or Radiate?
SESSION TITLE: Optical SETI and Detectability ofDirected Energy Systems
Me right now
Brown University Breakthrough Discuss April 2016 C. Rose
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4 Write or Radiate?
Something Communication Theorists Know
A truck filled with storage media, drivenacross town, is a very reliable high bit
rate channel.– Communication Theory Zeitgeist
Brown University Breakthrough Discuss April 2016 C. Rose
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5 Write or Radiate?
Sluggish Data vs. ADSL
Annals of Improbable Research 11(4), 2005
Brown University Breakthrough Discuss April 2016 C. Rose
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6 Write or Radiate?
Cute, But ...
Fundamental QuestionInfo delivery cost via Photons
vs.Info delivery cost via Package
Brown University Breakthrough Discuss April 2016 C. Rose
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6 Write or Radiate?
Cute, But ...
Fundamental QuestionInfo delivery cost via Photons
vs.Info delivery cost via Package
Info⇔ BitsCost⇔ Energy
Brown University Breakthrough Discuss April 2016 C. Rose
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7 Write or Radiate?
A Little Analytic Rigor
R2
π
0 D
apertures
0 Dr
τ =D/c+T
T
radiated message
D/c0
Mass Transport
Radiation
mass delivered
Brown University Breakthrough Discuss April 2016 C. Rose
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8 Write or Radiate?
Two New Units!
Brown University Breakthrough Discuss April 2016 C. Rose
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8 Write or Radiate?
Two New Units!
ρ ≡ Mass Info Density
Brown University Breakthrough Discuss April 2016 C. Rose
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8 Write or Radiate?
Two New Units!
ρ ≡ Mass Info Density
δ = cv≡ Transport Latency
1010 10 10 100 110 8 6 4
sola
r es
cape
earth
esca
pem
ilky
way
esc
ape
jetli
ner
bris
k w
alk
light
spe
ed
δ
Brown University Breakthrough Discuss April 2016 C. Rose
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9 Write or Radiate?
Inscribed Matter Energy Requirements
m = ρB
Ew ≥ 12mv
2 = 12Bρ
(c
δ
)2
Brown University Breakthrough Discuss April 2016 C. Rose
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10 Write or Radiate?
Radiation and Energy Capture
Omni: P R2
4D2 Directional: P R2G4D2
Brown University Breakthrough Discuss April 2016 C. Rose
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11 Write or Radiate?
Drum Roll Please ...
Brown University Breakthrough Discuss April 2016 C. Rose
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11 Write or Radiate?
Drum Roll Please ...
C = W log(
PkTW
+ 1)
ALL HAIL SHANNON!
Brown University Breakthrough Discuss April 2016 C. Rose
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12 Write or Radiate?
Radiation to Transport Energy Ratio
Ω ≡ ErEw
Brown University Breakthrough Discuss April 2016 C. Rose
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12 Write or Radiate?
Radiation to Transport Energy Ratio
Ω ≡ ErEw
Receiver Noise ≡ N0 Joules/HzMass Information Density ≡ ρ bits/kg
Velocity Ratio ≡ δ = cv
Normalized Aperture ≡ A = 2Rλ
Normalized Distance ≡ D = D2R
⇒ Ω ≥[ρN0c2
] [8π2
(DA)2]
(2 ln 2)δ2⇐
Equal Receiver/Transmitter Apertures
Brown University Breakthrough Discuss April 2016 C. Rose
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13 Write or Radiate?
Empirical Mass Information Densities• 20 lb paper @ 1000dpi: 2× 1010 bits/kg
• DVD: 3× 1012 bits/kg
• Magnetic Storage with FeO2: 2× 1017 bits/kg
• Optical Lithography with SiO2: 3.85× 1018 bits/kg
• E-beam Lithography with SiO2: 1.54× 1021 bits/kg
• STM with Xe on Ni: 1.74× 1022 bits/kg
• RNA: 3.6× 1024 bits/kg
• Li + Be: 7.5× 1025 bits/kg
Brown University Breakthrough Discuss April 2016 C. Rose
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14 Write or Radiate?
Radiationvs.
Inscribed Matter
Brown University Breakthrough Discuss April 2016 C. Rose
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15 Write or Radiate?
General Interstellar(ρ = 1022, δ = 103, Temperature 3K)
102
104
106
108
1010
1012
1014
1016
1018
1020
1022
D (normalized distance)
100
104
108
1012
1016
1020A
(nor
mal
ized
ape
rtur
e)Arecibo@10GHz10m Optical (500nm)1m Xray (0.1nm)Earth@10GHz
Ω
1
10-6
106
1012
1018
1024
1030
Brown University Breakthrough Discuss April 2016 C. Rose
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16 Write or Radiate?
10k Light Years
Arecibo⇔ Areciboρ = 1022, δ = 103, Temperature 3K
Brown University Breakthrough Discuss April 2016 C. Rose
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17 Write or Radiate?
10k Light Years
Arecibo⇔ Areciboρ = 1022, δ = 103, Temperature 3K
RadiationMatter
Brown University Breakthrough Discuss April 2016 C. Rose
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17 Write or Radiate?
10k Light Years
Arecibo⇔ Areciboρ = 1022, δ = 103, Temperature 3K
RadiationMatter
24 Megaton blastShelve a 5 lb sugar bag
Brown University Breakthrough Discuss April 2016 C. Rose
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18 Write or Radiate?
hey, Hey HEY!!!!! What About ... ?
Brown University Breakthrough Discuss April 2016 C. Rose
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18 Write or Radiate?
hey, Hey HEY!!!!! What About ... ?
• Radiation Penalty
– Impermanence and Repetition
• Matter Penalties
– Broadcast– Preservation– Inscription Energy– Deceleration @Target– Navigation– Advertisement
Brown University Breakthrough Discuss April 2016 C. Rose
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19 Write or Radiate?
Is Radiation Better for Broadcast?
Milky Way stellar density 2.8× 10−2 stars (LY)−3
Assume spherical galaxy, omnidirectional transmission, Arecibo receiverT = 3oK, ρ = 1022, δ = c
v = 103
D = 104 LY: 1.17× 1011 stars (but Ω > 1025)
Brown University Breakthrough Discuss April 2016 C. Rose
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20 Write or Radiate?
Is Radiation Better for Broadcast?
Milky Way stellar density 2.8× 10−2 stars (LY)−3
Assume spherical galaxy, omnidirectional transmission, Arecibo receiverT = 3oK, ρ = 1022, δ = c
v = 103
D = 106 LY: 1.17× 1017 stars (but Ω > 1029)
Brown University Breakthrough Discuss April 2016 C. Rose
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21 Write or Radiate?
Is Radiation Better for Broadcast?
Milky Way stellar density 2.8× 10−2 stars (LY)−3
Assume spherical galaxy, omnidirectional transmission, Arecibo receiverT = 3oK, ρ = 1022, δ = c
v = 103
D = 107 LY: 1.17× 1020 stars (but Ω > 1031)
Brown University Breakthrough Discuss April 2016 C. Rose
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22 Write or Radiate?
Is Radiation Better for Broadcast?
Milky Way stellar density 2.8× 10−2 stars (LY)−3
Assume spherical galaxy, omnidirectional transmission, Arecibo receiverT = 3oK, ρ = 1022, δ = c
v = 103
D = 108 LY: 1.17× 1023 stars (but Ω > 1033)
Brown University Breakthrough Discuss April 2016 C. Rose
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23 Write or Radiate?
Is Radiation Better for Broadcast?
Milky Way stellar density 2.8× 10−2 stars (LY)−3
Assume spherical galaxy, omnidirectional transmission, Arecibo receiverT = 3oK, ρ = 1022, δ = c
v = 103
D = 1010 LY: 1.17× 1029 stars (but Ω > 1037)
Brown University Breakthrough Discuss April 2016 C. Rose
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24 Write or Radiate?
Appropriately Awed Response
Brown University Breakthrough Discuss April 2016 C. Rose
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25 Big Question Question
A Big Big Question
Brown University Breakthrough Discuss April 2016 C. Rose
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25 Big Question Question
A Big Big Question
Why
Brown University Breakthrough Discuss April 2016 C. Rose
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25 Big Question Question
A Big Big Question
WhyCommunicate
Brown University Breakthrough Discuss April 2016 C. Rose
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25 Big Question Question
A Big Big Question
WhyCommunicate
AT ALL?
Brown University Breakthrough Discuss April 2016 C. Rose
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26 Howdy Neighbor!
Alien Psychology 101
Brown University Breakthrough Discuss April 2016 C. Rose
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26 Howdy Neighbor!
Alien Psychology 101
Sociability?
Brown University Breakthrough Discuss April 2016 C. Rose
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27 Howdy Neighbor!
Hello Exoplanet-ling!
IF U CN RD THS, join the party!Turn left at ...
Brown University Breakthrough Discuss April 2016 C. Rose
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28 Howdy Neighbor!
Let Us Help You!
Brown University Breakthrough Discuss April 2016 C. Rose
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29 Howdy Neighbor!
Hello Universe!
Bring technology!
Brown University Breakthrough Discuss April 2016 C. Rose
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29 Howdy Neighbor!
Hello Universe!
Bring technology!(but, please don’t eat us)
Brown University Breakthrough Discuss April 2016 C. Rose
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30 Survival
Universal (well, galactic) Truth
Brown University Breakthrough Discuss April 2016 C. Rose
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30 Survival
Universal (well, galactic) Truth
Survival?
Brown University Breakthrough Discuss April 2016 C. Rose
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31 Survival
OOPS!
Brown University Breakthrough Discuss April 2016 C. Rose
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32 Survival
OUCH!
Brown University Breakthrough Discuss April 2016 C. Rose
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33 Survival
RAPTURE!
(sorry, I couldn’t resist)
Brown University Breakthrough Discuss April 2016 C. Rose
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34 Writing to Survive
I’m Going With Survival
Brown University Breakthrough Discuss April 2016 C. Rose
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34 Writing to Survive
I’m Going With Survival
SURVIVORS: Those Who Write
Brown University Breakthrough Discuss April 2016 C. Rose
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34 Writing to Survive
I’m Going With Survival
SURVIVORS: Those Who Write
GAME OVER: Those Who Don’t
Brown University Breakthrough Discuss April 2016 C. Rose
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34 Writing to Survive
I’m Going With Survival
SURVIVORS: Those Who Write
GAME OVER: Those Who Don’t
Is “Biological” Info Transmission SOP?
Brown University Breakthrough Discuss April 2016 C. Rose
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35 Incursion HOWTO
Special Deliveries
Brown University Breakthrough Discuss April 2016 C. Rose
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36 Detection
Detection
Brown University Breakthrough Discuss April 2016 C. Rose
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36 Detection
Detection
HOW?
Brown University Breakthrough Discuss April 2016 C. Rose
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37 Detection
Incursion or Evolution?
Brown University Breakthrough Discuss April 2016 C. Rose
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38 Detection
Killjoy Biologists
“It’s all one show”–Gerald Joyce
Brown University Breakthrough Discuss April 2016 C. Rose
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38 Detection
Killjoy Biologists
“It’s all one show”–Gerald Joyce
“X→ Y? Evolution!”–Biological Dogma
Brown University Breakthrough Discuss April 2016 C. Rose
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39 Detection
Three Fundamental Questions
Brown University Breakthrough Discuss April 2016 C. Rose
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39 Detection
Three Fundamental Questions
(A:) What’s (X) alive and here today?
Brown University Breakthrough Discuss April 2016 C. Rose
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39 Detection
Three Fundamental Questions
(A:) What’s (X) alive and here today?
(B:) How easily/quickly X → Y ?
Brown University Breakthrough Discuss April 2016 C. Rose
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39 Detection
Three Fundamental Questions
(A:) What’s (X) alive and here today?
(B:) How easily/quickly X → Y ?
(C:) How many packages?
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
I
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
IDO
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
IDO
NOT
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
IDO
NOTKNOW
Brown University Breakthrough Discuss April 2016 C. Rose
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40 Detection
A & B?
IDO
NOTKNOW
(hard to frame the problem)
Brown University Breakthrough Discuss April 2016 C. Rose
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41 Detection
C: Package Density
Np = Pf`λpτp
Brown University Breakthrough Discuss April 2016 C. Rose
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41 Detection
C: Package Density
Np = Pf`λpτp
Np : number of parcels floating aroundP : number of planetsf` : fraction with loquacious intelligent lifeλp: parcels/yearτp: years parcel survival
Brown University Breakthrough Discuss April 2016 C. Rose
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41 Detection
C: Package Density
Np = Pf`λpτp
Np : number of parcels floating aroundP : number of planetsf` : fraction with loquacious intelligent lifeλp: parcels/yearτp: years parcel survival
P ≈ 1011 (NASA)τp = 108 (“geologic” design, galaxy-spanning @ c/1000)
λpf` ≈ 1 (loquacity balancing pessimism)
Brown University Breakthrough Discuss April 2016 C. Rose
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41 Detection
C: Package Density
Np = Pf`λpτp
Np : number of parcels floating aroundP : number of planetsf` : fraction with loquacious intelligent lifeλp: parcels/yearτp: years parcel survival
P ≈ 1011 (NASA)τp = 108 (“geologic” design, galaxy-spanning @ c/1000)
λpf` ≈ 1 (loquacity balancing pessimism)
Parcels per star: ∼ 108
Brown University Breakthrough Discuss April 2016 C. Rose
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42 Conclusion
Punchline
It seems the ’Sounds of Earth’ gold disks aboard Voyagers 1 and 2(see cover) were on the right track. The message-in-a-bottle ideaof sending physical objects across space is highly energy efficient,and we should search for artefacts in the Solar System now.
– Nature Editors
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42 Conclusion
Punchline
It seems the ’Sounds of Earth’ gold disks aboard Voyagers 1 and 2(see cover) were on the right track. The message-in-a-bottle ideaof sending physical objects across space is highly energy efficient,and we should search for artefacts in the Solar System now.
– Nature Editors
But ...
Brown University Breakthrough Discuss April 2016 C. Rose
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43 Conclusion
Maybe We Should Seed Too
Brown University Breakthrough Discuss April 2016 C. Rose