Correct me if I'm wrong . But no nation has deployed MT class nuclear warheads on submarines or road mobile launchers either.
A hydrogen bomb literally needs to have a hydrogen gas tank next to a normal fission nuke making the warhead pretty bulky ..
IMO MT Class nuke warheads were needed when the cep of the missile was too much, nowadays precise mirv strike can do the thing.
but still MT class nukes is must to have in order to be in level of p5 nations
This has more to do with utility. Off course there is no use of vapourising a part of land to a higher depth. Destruction is absolute in a constant area regardless of blast yield of weapon (if yield exceeds 20kT).
So in case of wartime use, hydrogen bombs of 200-300 kT with high radius of damage to size ratio, become more efficient against MT class thermonuclear weapons.
Well, of course Arihant cant carry ICBMs. I was talking about a future fleet.
Then off course I said India doesn't have a 1000 naval nuclear warheads. Both future fleet and India having thousands of nuclear weapons, are at least 2-3 decades away things.
I beg to differ. Yes, as I said earlier, surely we can design MT class bombs, but the ruggedization and miniaturization absolutely requires physical testing;
AFAIK, it would be not an engineering problem if process and effects of both types of nuclear explosions have been tested as scaled up versions would be based upon them. No P5 countries have used actual tests either test ban, yet they have been improving it.
plus nuclear deterrence is weakened if you haven't shown your enemies that your bomb works as finely as advertised.
It is different in case of India where doubts on reliability of Indian TNWs by P5 (or probably P5's classified awareness about Indian nuclear capabilities), has earned India a good amount of respect in world unlike other non NPT nuclear powers which are treated as rough states.
You (and so is thought by P5) just simply can't compare India to other non NPT powers given India's missile, reactor, propulsion capabilities, contributions to ITER and most important, ability to outspend even P5 countries in this aspect. So until India actually emerges as an unchallenged force like US & USSR were during cold war and surpasses/matches P5's nuclear weapons, there would be no use of physical testing. Benefit of doubt will be there for India's untested city busters.