If all other things are equal -- number of miners, hashrate, price -- will you need 2x as much energy in order to mine 1 bitcoin after a halving?
I am not a trader, so the heart of the question is not about price. This is just for the purpose of understanding.
no
the main rule of bitcoin is this
the coin reward is not a calculation of the energy..
its a hard rule of X coins per block..
2016 blocks a fortnight
half X every 210,000 blocks..
the energy usage does not determine coins mined per block. the coins are rewarded at a fixed rate that halves every 210,000 blocks. it does not matter how much hashpower went to it
it doesnt matter if its cpu power blockchain that never used asics or gpu power that never used asics or asic power .. the rule remains..
the effort.. the energy does not determine the coins rewarded. it determines the underlying value people will sell it for.
the more hard work. the more the coin is worth because people try to refuse to sell at a loss of their hard work/acquisition costs.