radiate not write, might etcrose/papers/midnight.pdf · radiate christopher rose 1 and gre gory...

ETMightWrite,NotRadiate

ChristopherRose1andGregoryWright2

1WINLAB

RutgersUniversity

Piscataway,NewJersey08854USA

2AntiopeAssociates

18ClayStreet

FairHaven,NewJersey07704USA

December16,2004

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Atruckfilledwithstoragemedia,drivenacrosstown,isaveryreliable

highbitratechannel.

–Comm.TheoryCollectiveSubconscious

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TenYearsofWirelessResearch

SpectrumManagement

Interferencehurts,sodealwithit!

Delaytolerance

–Transmitwhenchannelgood!

Mobility

–Isnotanathemaithelps!

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GOPOSTAL!Radiointerferenceisbad

–Mutualinterferenceisanetworkkiller

Mobilityisgood

–Canoftentoleratedelay

–Channelespeciallygoodwhennearby

Storagedensityisincreasing

–FasterthanMoore!

ForgetRadio!Writemessagedown!Tossittorecipient!

Completelyridiculous!!(right?)

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Nope,NotRidiculousNYC/BostonMatterTransportEnergy

–200milesat20milespergallon

–12108Joulespergallon

–100kgDVDs:25105bits/joule

EquivalentRadiationEnergy

–Satellite:5660bits/joule

(35104kmuplink,D2propagation,1m2dish)

–Terrestrial(320km,D4propagation):MUCHlowerefficiency

Butadhoccomparisonsareunsatisfying

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ALittleAnalyticRigor

R2

π

0D

apertures

0Dr

τ=D/c+T

T

radiated message

D/c 0

Mass Transport

Radiation

mass delivered

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InformationDensity,ρ

HowAboutBlackHoles?

SchwarzschildRadius:r2GMc215X1027M

Infocontentgoesaseventhorizonsurfacearea:1072r2bits

ρ151045rbits/kg

Microhole(1µmradius):151039bits/kg

Donut-holesizedhole(1cmradius):151043bits/kg

Aweebitimpractical(andantisocial)

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EmpiricalMassInformationDensitiesI

VoyagerSpacecraft:106bits/kg

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EmpiricalMassInformationDensitiesII20lbpaper@1000dpi:21010bits/kg

DVD:31012bits/kg

MagneticStoragewithFeO2:21017bits/kg

OpticalLithographywithSiO2:3851018bits/kg

E-beamLithographywithSiO2:1541021bits/kg

STMwithXeonNi:1741022bits/kg

RNA:361024bits/kg

LiBe:751025bits/kg

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MinimumTransportEnergy,E

Justtheinitialkineticenergy:

E

12

mv2

.

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MinimumTransportEnergy,E

Justtheinitialkineticenergy:

E

12

mv2

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InscribedMatterEnergyRequirementsMessagesizeB,massinformationdensityρ

Ew

12

Bρ

v212

Bρ

cδ

2

10 101010100110864

solar escape

earth escapem

ilky way escape

jetliner

brisk walk

δ

light speed

Artillery:addsafactorof2toenergy

Escape:smallpenaltyifv2escapevelocity

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RadiationEnergyRequirementsEnergycapture

νD

AG

4πD2

BitsalaShannon:

BTCTWlog2PGA

4πD2

N0W

1

ErPT,

ErBN04πD2

AGTWB

2B

TW1

LargeTW:

ErBN04πD2

AGln2

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RadiationtoTransportEnergyRatio

ΩEr

Ew

NormalizedApertureA2Rλ

NormalizedDistanceDD2R

ΩρN0

c2

8π2

DA

2

2ln2δ2

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IsotropicRadiationvs.TerrestrialArtillery

ρ31024,R5cm,Temperature300K

10-9

10-8

10-7

10-6

10-5

Fraction of Lightspeed10

0

102

104

106

108

1010

Ω

D=10mD=100mD=1000mD=10000m

walking

running

jetlinerAside:250secondsbetweenNYCandBostonballistically

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ChiptoChipLaserLinks

D=10cm

2R=10um

300KIR

Laser

Delay:δ109

Wavelength:λ1µm

Magneticstorage:Ω104

STMinscription:Ω5108

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Interstellar

(ρ1022,δ103,Temperature3K)

102

104

106

108

1010

1012

1014

1016

1018

1020

1022

D (normalized distance)

100

104

108

1012

1016

1020

A

(norm

alized ap

erture)

Arecibo@10GHz10m Optical (500nm)1m Xray (0.1nm)Earth@10GHz

Ω

1

10-6

106

1012

1018

1024

1030

10kLY,Arecibo-Arecibo:Ω51015

–Radiation/Matter:(2megatonblast)/(Shelve5lbsugarbag)

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Voyager

109bitpayload

900kgmass

Catapultlaunch:about800joules/bit

BreakevenDistance:2000lightyears

Asides:

–RocketLaunch:distanceup9.

–Use3DVDs(insteadofgolddisc):distancedown10

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ThePhysicsHasSpoken

Matterisstunninglymoreefficientforawiderangeofdistancesandmethodsof

radiatedcommunications.

Butwhatabout...

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MatterandRadiationPenalties

Radiation

–ImpermanenceandRepetition

Matter

–Broadcast

–InscriptionEnergy

–DecelerationAtTarget

–Preservation

–Advertisement

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MatterPersists–RadiationVanishes

messageradiated

messageradiated

messageradiated

birthlife

time

radiatedmessage

mass packet

CivilizationBirthRate:α1109peryear

CivilizationExtinctionRate:β1106peryear

Successcriterion0Φ1

Howmanyradiatedrepetitions?

–Φ0992105

–Φ099992107

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IsRadiationBetterforBroadcast?

Radiationilluminatesmanymatterpenalty

MilkyWaystellardensity28102stars(LY)3

Sphericalgalaxy,isotropicradiation,Arecibo-Arecibo

–R104LY:1131011stars(butΩ1028)

–R106LY:1131017stars(butΩ1032)

No,inscribedmatterstillwins!

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InscriptionEnergy/Speed

MatterInscription/ReadoutEnergyandTime

–Canbereversibleandabitrarilyfast(R.Landauer)

Empiricalenergycalc:

–60000ATP/secondfor20minutes:4639KbaseofE-coli

–81020JperATPmolecule

–621019Jbit1.

–Eatearthescape:1681017Jbit1.

Constructionenergyprobablynotaproblem

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ParkingthePackage

Assumeexhaustbraking

Energypenalty(excessmass):ec

δgIsp

IspSpecificImpulse

–Chemical:102

–NuclearElectric:104

–Fusion:106

Isp20000,δ1000penalty46

δ100orIsp2000penalty44106

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CosmicInsultsInsults:

–Highenergyparticlebombardment

–Heating(diffusion)

–Iontracks,dislocations,subatomiccascades

Shielding:

–10millionyearsat10%bacteriaviability:3mradiusrock

(3gcm3density)

–34106penalty

CleverComposition,CodingandCorrection?

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OverallImplication

ETmightwritenotradiate

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SolarSpaceisBIG

MessageAdvertisement?

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BigRock?

Somewhatantisocial

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OddRock?

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SeededComet?

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ActiveProbe?

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LifeBoat?

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CONCLUSIONS

IfDelayAcceptable

Inscribedmattermessagingisefficient

–FedExandNetflix

MightevenfinesseGupta-KumaradhocnetsNproblem

–littledatamissiles

Chip-to-chipormote-to-motecommunication

–smartdusttossinginscribeddust

Shouldstartlookingforextraterrestrialartifacts

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LearnMore

Nature431,pp.47–49,September2,2004WebSite:http://www.winlab.rutgers.edu/crose/cgi-bin/cosmic19.html

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