Black Hole Explorer Satellite

Ref Bari

Black Holes

Black Holes: An Intro

Imaging a Black Hole

Imaging the Photon Ring

BHEX 2.0?

Black Holes

Black Holes: An Intro

Imaging a Black Hole

Imaging the Photon Ring

BHEX 2.0?

Black Holes: An Intro

Black Holes: An Intro

Black Holes: An Intro

Black Holes: An Intro

R

Black Holes: Anatomy

R

Event Horizon

Singularity

Black Holes: Anatomy

R

Event Horizon

Singularity

Photon Sphere

\frac{3}{2}R

Black Holes: No-Hair Theorem

R

\text{Mass } M

\text{Charge } Q

\text{Spin } S

Black Holes: Mass

R

M

\boxed{R=\frac{2GM}{c^2}}

Black Holes: An Intro

R

M

\text{Mass } M

\text{Charge } Q

\text{Spin } S

Black Holes: Charge

R

Q

Black Holes: Charge

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Black Holes: Charge

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Black Holes: Charge

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\sim 1 \mu s

Black Holes: An Intro

R

M

\text{Mass } M

\text{Charge } Q

\text{Spin } S

Black Holes: Spin

R

S

\vec{J_z}

Black Holes: Spin

R

S

\vec{J_z}=mrv

Black Holes: Spin

R

S

\vec{J_z}=mrv

\begin{aligned} d s^{2} = & - (1 - \frac{2 M r}{Σ}) d t^{2} - \frac{4 M a r \sin^{2} θ}{Σ} d t d ϕ + \frac{Σ}{Δ} d r^{2} + Σ d θ^{2} \\ + (r^{2} + a^{2} + \frac{2 M a^{2} r \sin^{2} θ}{Σ}) \sin^{2} θ d ϕ^{2} \end{aligned}

Kerr Metric

Black Holes: Spin

R

S

\vec{J_z}=mrv

\begin{aligned} d s^{2} = & - (1 - \frac{2 M r}{Σ}) d t^{2} - \frac{4 M a r \sin^{2} θ}{Σ} d t d ϕ + \frac{Σ}{Δ} d r^{2} + Σ d θ^{2} \\ + (r^{2} + a^{2} + \frac{2 M a^{2} r \sin^{2} θ}{Σ}) \sin^{2} θ d ϕ^{2} \end{aligned}

Kerr Metric

\text{Spin Parameter } a=J/Mc

0\leq a \leq 1

Black Holes: Spin

R

S

\vec{J_z}

\begin{aligned} d s^{2} = & - (1 - \frac{2 M r}{Σ}) d t^{2} - \frac{4 M a r \sin^{2} θ}{Σ} d t d ϕ + \frac{Σ}{Δ} d r^{2} + Σ d θ^{2} \\ + (r^{2} + a^{2} + \frac{2 M a^{2} r \sin^{2} θ}{Σ}) \sin^{2} θ d ϕ^{2} \end{aligned}

Kerr Metric

Stretched Event Horizon

Ring Singularity

Black Holes: Accretion Disk

Black Holes: Accretion Disk

Black Holes: Accretion Disk

Innermost Stable Circular Orbit

Black Holes: Orbits

Black Holes: An Intro

Black Holes: An Intro

Black Holes: An Intro

R

M

\text{Mass } M

\text{Charge } Q

\text{Spin } S

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

\text{Charge } Q

\text{Spin } S

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

\text{Spin } S

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

S \sim a\propto J/M

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

S \sim 0 \leq J/M \leq 1

M

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

S \sim 0 \leq J/M \leq 1

M

Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

S \sim 0 \leq J/M \leq 1

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Black Holes: An Intro

R

M \rightarrow R = \frac{2GM}{c^2}

Q \sim 1 \mu s

S \sim 0 \leq J/M \leq 1

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\vec{J_z}

Black Holes: An Intro

R

M

Q

S

Black Holes: An Intro

R

M

Q

S

Black Holes: An Intro

R

M

Q

S

Black Holes: An Intro

R

M

Q

S

Black Holes: An Intro

G\propto T

Black Holes: An Intro

G\propto T

Black Holes: An Intro

G\propto T

Black Holes: An Intro

G\propto T

(1915)

Albert Einstein

Black Holes: An Intro

(1916)

Black Holes: An Intro

(1916)

Write it on the board, Ref!

It's too godamn long to fit in here!

Sincerely,

Chatgpt

Karl Schwarschild

Black Holes: An Intro

(1939)

Robert Oppenheimer

Black Holes: An Intro

(1960)

\begin{aligned} d s^{2} = & - (1 - \frac{2 M r}{Σ}) d t^{2} - \frac{4 M a r \sin^{2} θ}{Σ} d t d ϕ + \frac{Σ}{Δ} d r^{2} + Σ d θ^{2} \\ + (r^{2} + a^{2} + \frac{2 M a^{2} r \sin^{2} θ}{Σ}) \sin^{2} θ d ϕ^{2} \end{aligned}

Roy Kerr

Black Holes: An Intro

S\propto A

(1975)

Stephen Hawking

Black Holes: An Intro

(1998)

Andrea Ghez

Black Holes: An Intro

(2015)

LIGO Collaboration

Black Holes: An Intro

(2017)

Event Horizon Telescope (EHT)

Black Holes: An Intro

(2031)

Black Hole Explorer Satellite (BHEX) Mission

Black Holes: An Intro

BHEX

EHT

LIGO

Penrose

Ghez

Einstein

Schwarschild

Oppenheimer

Kerr

Hawking

Black Holes: An Intro

BHEX

EHT

LIGO

Penrose

Ghez

Einstein

Schwarschild

Oppenheimer

Kerr

Hawking

Black Holes: An Intro

Imaging a Black Hole

Imaging the Photon Ring

BHEX 2.0?

Black Holes

Black Holes: An Intro

Imaging a Black Hole

Imaging the Photon Ring

BHEX 2.0?

Black Holes

Black Holes: An Intro

Imaging a Black Hole

Black Holes: An Intro

Imaging a Black Hole

R

Black Holes: An Intro

Imaging a Black Hole

R

3R

Imaging a Black Hole

R

3R

\frac{3}{2}R

Imaging a Black Hole

R

Imaging a Black Hole

Imaging a Black Hole

R

Imaging a Black Hole

R

3R

\frac{3}{2}R

Imaging a Black Hole

R

3R

\frac{3}{2}R

2.6R

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Imaging a Black Hole

Black Holes: An Intro

Imaging the Photon Ring

BHEX 2.0?

Black Holes

Imaging a Black Hole

Black Holes: An Intro

Imaging the Photon Ring

BHEX 2.0?

Black Holes

Imaging the Photon Ring

Imaging the Photon Ring

(1) What would be the data transmission rate?

(2) How big would the radio antenna be? How does angular resolution scale with the antenna's diameter? How does the thermal noise scale with the diameter?

(3) What kind of cryocooler can maintain the antenna at low temperatures?

(4) How would you protect the satellite against radiation effects?

Imaging the Photon Ring

Imaging the Photon Ring

Imaging the Photon Ring

Imaging the Photon Ring

A Potential Smallsat

3. Ivy Space Coalition