Neutron Stars and Black Holes (Lecture - 04: The Interior of Neutron Stars) by G Srinivasan

NEUTRON STARS AND BLACK HOLES
SPEAKER: G Srinivasan (​Raman Research Institute - Retired)
DATE: 15 May 2019 to 28 June 2019
VENUE: Emmy Noether Seminar Room, ICTS Bangalore
The theme of the course will be neutron stars and black holes, with emphasis on neutron stars in binaries (their formation and rotational history); their mergers; gamma ray bursts; formation of intermediate mass and super massive black holes.
Lectures:
1) Diffuse Stars
2) Life History of the stars
3) Quantum Stars
4) Neutron Stars and Supernovae
5) Interior of neutron stars
6) Superfluidity and superconductivity inside neutron stars.
7) Neutron Stars as Pulsars
8) Gravitation - From Newton to Einstein
9) Maximum mass of neutron stars
10) Evolution of neutron stars in close binaries
11) Recycled pulsars
12) Tests General Relativity using Double Neutron Stars
13) Gravitational radiation from neutron star mergers
14) Black Holes of General Relativity
15) Super massive Black Holes
16) Universe versus Multiverse
Schedule:
May - 15, 17, 22, 24, 29 and 31
June - 5, 7, 12, 14, 19, 21, 24, 26 and 28
Time: 10:00 AM
Link: www.icts.res.in/lectures/summ...
Table of Contents (powered by videoken.com)
0:00:00 Neutron Stars and Black Holes (Lecture - 4: The Interior of Neutron Stars)
0:00:08 The Interior of Neutron Stars
0:00:22 How does Nature make Neutron Stars?
0:02:00 Onion skin model of a massive star
0:02:27 Evolution of massive stars
0:04:49 Core collapse -Neutron star -Supernova
0:05:20 Neutron Star as "ground state of matter"
0:09:51 Absolute ground state of matter at zero pressure
0:14:56 A journey to the centre
0:22:15 Neutron rich nuclei
0:25:05 Beta Equilibrium in the fluid core
0:31:09 Equation of state above the "neutron drip"
0:43:56 Superfluidity and Superconductivity in Neutron Stars
0:44:55 Superconductivity & Superfluidity
0:54:51 Bardeen - Cooper - Schrieffer Theory (1957)
1:00:43 Superconductors
1:03:00 Superfluid states in neutron stars
1:09:21 Transition temperature
1:10:46 Superfluidity and Superconductivity
1:17:10 Superfluid Transition Temperature in neutron stars
1:18:36 Superfluid in a rotating vessel
1:28:24 Neutron Superfluidity
1:31:58 Superconductors are diamagnets
1:32:02 Type II Superconductors
1:33:48 Type II Superconductivity
1:36:25 Abrikosov vortex lattices
1:37:41 The inter-pinning of the fluxoids and vortices
1:38:08 Coupled 'Super states'
1:38:26 Proton superconductivity in neutron stars
1:41:27 Q&A

[@sciencemore4604]

From this lecture I learned that when iron 56 is first formed it creates an iron white dwarf at the center of the massive star. Which then collapses when it reaches Chandrasekhar's limit. Wow.

[@fredfolson5355]

I love the homework problem he puts out there at the 16 min mark.

[@rexremedy1733]

Is vacuum superconductive with respect to virtual particles?

[@zxwmabcdef5439]

I could be wrong but my understanding is that non metals resist compression because the electron clouds repel each other. Metals are degenerate just like a white dwarf and resist compression because of electron degeneracy pressure.

[@francoisdewit7281]

Why doesn't pressure make 2 neutrons when a proton (2 up + 1 down ) + an electron ( 3 down ) come together ? Neutron ( 1 up + 2 down ) or even a neutron-meson ( 1 up + 1 anti-up ) .

[@zxwmabcdef5439]

Would the interior of the crust be an analog to a metal? If it is ions in a neutron gas it should be similar. Metals are ions in an electron gas.

[@rexremedy1733]

Actually, it is too different. The conductivity is not comparable to metal. Since in a metal electrons comprise a vast majority of the total volume. While in a neutron Star the conductive properties derive from neutron decay and reverse decay. The total volume in this form of matter is comprised of nuclei, with only a fraction of its volume establishing conductivity.

[@carnsoaks1]

more more more

[@theawantikamishra]

This is a a month long summer school Carn, keep visiting

[@carnsoaks1]

what about flat neutron stars? do any Indians believe in flat earth?

[@theawantikamishra]

No

[@AbyNeon]

Your conclusions are completely wrong, the outer crust and all the way to the core of aneutron star is pure plasma at absolute 0 temperature and no mass at all, the inner core is way much denser than what you think.... an dteh most important thing is that neutron stars do have a atmospher elike layers abopve the crust in a number of rings overlapped one on top of tehothers with the outer one with an equivalent temperature of the neutron star mass if it was a star at the precise moment it would go supernova. This amount of energy isnecessary so for the light emitted by tehsupernova to have that tiny amount of mass to be capable connectrl to an electromagenti wave forit to make it visible to us.... if it didnt have that, then the neutron star would be lieka blakc hole but with mass... Blakc holes have no mass at al and are th eoppisite of neutron starts,,,, the crust is high density space time fabric, and the inside is absolute nothing, no space no time, a rip in the fabric of existance...... the heat in the outer ''atmoshere''shells of a neutron start beocme hot becuase of the friction of particles, getting their attibutes as they are being transfomred into particles of light. I really do not understand hwo is it possible that such brilliant minds with so much luck to have been able to have suchhigh education are stil coming to colclusions, that make you seem as if you are stil in teh Glilean era only just using fancier words, in your theories. This whole lecture is basicaly no different than a lecture abotu ether given 150 years ago....all looks genius, and all is like a teenager fantasy watching star wars. In controlled extreme echosystems like in teh cas eof neutron stars mathematics as we kno wit doesnt apply, in that kind of space time, 2+2 doesnt equal 4, you need to recaliber in relation to its space time attributes. The mass of a neutron star is so high that its life span is not even a millisencond while to us it might seem as if billion of years