Not necessarily - I've read a book before theorising that it could be possible but requiring some means of receiving a person from the future as well as sending. So we would know as soon as a suitable receiver (which I think was also the transmitter, unfortunately I can't remember the details exactly) was built, that time travel were possible - unless people in the future decide to be assholes about it and make their first arrival date a year after the machine is turned on.this isnt my name said:Agreed if time travel were possible we would know becuase time travelers would be here.
I'd never actually heard of this "Higgs singlet" theory - odd as I thought I was keeping relatively on top of developments at the LHC. Must look further into this, it sounds fascinating. (Seemingly the reports about it have only just started though so it seems a very new development - but apparently, at least according to Wiki, it's based on a kind of supersymmetry which if true would drastically change all that we understand about the - still-theoretical - Higgs boson)
Also, someone else's comment about "sending messages to the future" - we already have an efficient means of sending a message a year into the future in England. It's called Royal Mail.