I know religious people are absolutely convinced of some sort of afterlife but for me I am not convinced at all for me personally I feel like nothing will happen when I die now of course I don't know what happens but I just feel like nothing will happen anyway what are your thoughts on an afterlife ?
The 2nd law of thermodynamics states that the entropy of the universe has to increase. This is well established consensus science. Explaining the nature of entropy can get esoteric, but in the lab, entropy can be measured with accuracy. It is real.
An entropy increase will need to absorb energy. Going from lower to higher entropy adsorbs energy. We can reverse entropy; lower entropy, to get the energy back. However, since the 2nd law says that the entropy of the universe has to increase, this means the universe is net bleeding energy into increasing entropy.
In other words, energy is disappearing from the material universe, tied up into increasing entropy; red shift. Red shifting energy is losing energy, forever. The energy is going sort of going to another dimension, in a loose sense. If we apply energy conservation, where energy cannot be created or destroyed, this energy loss due to the second law is conserved, but in a way that is net off limits to the material universe, due to its ever increasing sense. This lost, but conserved energy is a good place for the so-called spiritual realms.
In engineering, entropy is a state variable, meaning any given state of matter, has a fixed value of entropy. In that sense, entropy is like the finger print or identity of any state matter. The entropy of water at room temperature is 188.8 Joules/(mole K) no matter who measures it. The energy equivalent is conserved in the other dimension like a state blueprint. Life and the brain continuously generate entropy increase, which means our personal history; biology and consciousness sort of has a conserved energy data storage due to the 2nd law; all our states.
Science, via the extrapolated logic of the 2nd law of entropy and energy conservation does provide for the idea of structured quanta of energy conservation, that is detached from the material universe, albeit, it came from the material universe. Whether this is the spiritual realm is not yet subject of any direct science proof, since this new concept, although logical, is still part of future science.
Often when soft science people investigate ghosts, a common observation is a cold feeling in a room when ghosts appear. An increase in entropy will absorb energy and will make the area colder. Since entropy is reversible, on a small scale, but still the overall entropy has to net increase again, any connection to the other realm, where entropic energy has collected and conserved, theoretically should feel warm then colder to reflect coming to the material side and back. This does not require any new energy, but simply changes at the quantum level.