Question

if I go in my past and kill myself and came back to present am I dead or alive???​

Answer 1

Theory suggests that if u will do so then u will be alive in the future but to whom u will kill gets killed in some other parallel universe. But this theory is mere a hypothesis not more than that. You are free to reject it anytime. The best explanation of this is that if u will do so then u will not be present at that position that time... I mean u will not be in past because reality as we know it today is very uniform means u can be at one place only....either past or present or future and that is upto u